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Патент USA US2408387

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Oct. 1, 1946.
~ 2,408,386
’ Filed Nov. 4, 1944
2 Sheets-Sheet 1
o 1;
Q ’/
JOHN R Fuzz »’
0% 1,1946.
J, |;-_ FURRY
‘Filed Nov. 4, 1944
2vSheet's-‘SI-1eet 2
v‘ Z]v
I‘. 4
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_ @1131»
.1 M” I
229 7/zza1a124=
?zz, £03527
Ego-H8 F3 Foggy
‘ 2,408,386
Patented Oct. 1, 1946
' ' board
& Manufacturing Company,‘
‘ IGaIesburg,‘ Il1.,_'a: corporation of Delaware’
7 Application November 4, 1944, Serial No. 561,956 .
19 claims.’ (01.123-1'73)»
This invention relates to improvements in en'
tially in longitudinal section through the cylin
g'lines and engine coolingmethods.
The invention has particularly reference to a
two-cycle engine with vertical drive'shaft-adapted
the line 4-4.0f Fig.
for outboard motor use._ It is a primary object
'_ Fig. 4 isa detailview taken incross section'onv
v '
Fig, 5 is a'fragmentaryview,similar to Fig-,A,
of the invention to provide improved control of
Fig. 6 isa aslightly
view_ in'perspective
modi?ed construction.
showing the par
the eoolingfwater order. to establish temperature differentials between vvarious ,parts of the
a cylinder block. in v accordance with the varied re
tition plategused inthe embodiment shown? in
' The cylinder'block casting-l includes [cylinders
quirements of different-parts k'oflw the engi'ne._ -
2 and _3 which,in accordance with conventional
two-‘cycle engine practice; arei'suppliedwith; com
_More specifically; it .is my-purpose to provide
an: internal combustion- engine 1 cylinder. block, in»
whichiaprcombination of forced circulation and
gravity, circulation will properly cool different
bu'stible mixture frorni‘the crank case Qthrough
transfer manifolds‘ 5 and-51 (Fig; 12).; Surround‘-v
ing'the transfer manifolds *5- and sane ‘thelade
jace'rit' sides of vcylinders‘, games; the'blockil pro
parts of the engine cylinders and exhaust to their.
respective required temperatures; regardless of
vides a'large cavity‘ at '1 for‘ cooling water.~ '
the speedof?operation of the 'engineand the
‘ :At the opposite-side'ofithe ‘block, the5 cylinders’
pump which supplies its cooling water.v ‘Outboard; 1 2 and 3 have exhaust ports 8, 79, opening into a
motors in‘. particular have-tonbe adapted for a; 20 chamber‘ In (Fig. 1) formeduby an‘integ'ral web‘
H.‘ ' The chamber I0 opens downwardly at l2 and,
wide variation in the rate of water circulation
due to the fact that 'these'motorsare sometimes ' when the'eng'ine is assembled on the'shaft'hous-Y
ing l3, the‘ opening [2 communicates with the"
run at top‘speed and at other times areidled over
long periods. The pump is ordinarily driven from
the crank shaft or propeller shaft at a rate pro
portioned to the rate of engine operation. In
order to provide adequate coolingwater during
idling speeds of the engine, it is frequently neces
sary to provide an excess of cooling-water at full
engine speeds. There are some parts of the cyl 30
inder block to which the resulting excessive cool
ing is immaterial. Other parts'of the engine
cylinder block should'be operated withinva com
paratively narrow range of temperatures. As will
hereinafter» be explained,I-I meet these require'-' 35
ments b'y a'combina'tion of forced circulation and
gravity circulation, the latter being localized in
the cylinder block.
2 It is a further object of
the invention to achieve
the foregoing objectives} while-providing at; en'-v
gine cylinderpblock of smooth external‘outline‘
and simpli?ed design.
skilled in the art upon‘ examination of the follow
the drawihgs:
‘ Fig. '1" is a view in
perspective ewe; cylinder
from the exhaust manifold chamber In is a cavity
[5 for‘ cooling water, the sides'of cylinders v2 and
3 on the exhaust side of the block being exposed
in cavity
I ‘
Cast integrally with the cylinders ’2'and- 3‘and
the web is a jacket shell l6 ?nished at ‘J1 to abut
the crank case and having 2a, top‘ portion I8, an
endportion l9 and a‘bottomportion 20-." The
inn‘er‘or crank case end 11 vofthe shell is mate's‘
rially wider than its ‘outer end 19,:the shell being
wedge-shaped l‘ in r-plane; as. clearly appears~in
A partition web
~ 1'“ the vtop [8,; of the
shell with cylinder:,2-.. A'similar; web ‘at 22 con-
nects-the bottomof the shell, with‘ the “under
surface of the cylinder 3. vlilaclrqof the- partition
The? cavity
port 24
1 ‘I [is
stop by.
25-3,‘ vableéclosuliie
; , y - TY
50 26 shown .. in“. . perspective, I detail, in Fig.
'c"avitygl5_\is sealed by theslemovahle."closure 2];
shb'wn in perspective 'detail’in Fig'.,1,v The‘ closure
Fig. construction.
2 is a view in _ perspective
l __
I, J
' Fig. 3 is a view partially‘ in'elevation and'pav‘
at ,the intakeside of»;the engine is providedlby a
2] yjpreferably hail a, . Web 128 p, which ' registers
_ inder'block casting with the other'jof‘ its'rernojy-z'
able face plates] shown in detachedlrelation'ship.
haust side of the engine-and the‘coo'linig cavity'lg .
‘ " "
main casting being broken away toexposeitsHin-V
between thacooling; watercavity .l5;>a_t the ex-=
" '
block casting with one of its removable faceiplat‘es'
shown in a; detach d relationship, portions ofi'the
~ Surrounding the web‘ and separated thereby
webs Ztand ~22‘extends logitudinally of-thevblock
ina centralv plane; Restricted communication
7' Still other objects will be apparent to‘those'
ing .ilisclesllreo-ithesinvention: 1
exhaustpa‘ssage l4 which'is provided in- the'shaft
throughout with ‘the web" Ji- to. nroyidegatj 192a
cavity which serves to enlarge'the capacity‘ of
the exhaust chamber or manifold I0. Surround
ing the web 28 is a water circulation cavity 30,
which enlarges the capacity of the water circula
tion cavity I5. Due to the wedge-shape of the
casting I, the two closures 26 and 21 are con Cl
vergent away from the crank case 4.
The outboard motor drive shaft 3I operates a
pump of any desired type which is here illus
trated, purelyrdiagrammatically; asira centrifugal-i
pump at'*32,‘ having a pressure pipe~33; commu
nicating with duct 34 in the engine block casts
ing I. The duct 34 leads upwardly in partition
22 to a transverse bore at 35*wliich1 isiprefera-lilyr
The. cooling, water_ thus supplied. under. p_res=
sure from pump 32‘passes upwardlyr throughthose
portions-of cavities I5.~and~3.D,which are; outside‘
of ’ the registering webs I‘I' ail-c1523‘ and‘ thence.
across:abovethetopspfwebslili'andigzt into those
portions of = cavities I 5..‘ and 311i whichllienear; the.
crank,‘ case.v The . waters will, flow? downwardly
through.these.portions.~ oilth'e_cayities to an ,out.-.
let 3‘! communicating with a duct ‘3am the lower.
unit,,whereby. theMa-ter. isadeliveredrinto.the,ex
hallst imanifold-v I A.
r’ktmthe.exhaustz side. ofs the-engine. it. would ,be;
difficult". to get excessiveecoolingl. Most of; the:
heatrequired .to bGcI‘EmOVTBd duringgengineoper~
ationsisedeyelopedr atethe: exhaust-side. of.- the r err-
not well cool the exhaust side of the engine ex
cessively, the actual fact is that the temperature
of the exhaust side of the engine should not be
allowed to be reduced too low. In other words,
the temperature is not nearly as critical on the
exhaustii'side as :on the‘ intake: side; but. cooling
can- be overdone:
extended through an integralrbossj?mtouopen,into;
the cavity 30 within the closure”; Sihceacayitye ‘
30 ordinarily communicates throughouteitssextentte
with cavity I5, the boss 36 mayv ordinarily'be
omitted if desired. It is usefull'rprimarily?n'cone»
nection with the modi?ed embodimentlshownrinn
Figs. 5 and 6 hereinafter:v to be described.
In actual practice, a still further segregation
of temperatures may be desirable. While it is
broadly true, as indicated above, that one can
Where overcooling of the exhaust side is threat
ened, I may incorporate between the cylinder
block-casting F» and the closure 27 a partition
platej?hwhichl may‘. be made of sheet metal,
as'..indicat’edzine?g;. 6; and inserted as a lami
nation hetweenlcastings I and 21. The plate 40
has an opening-4| preferably registering. with the
exhaustil'manifoldi cavities I0 and 29 to afford full
communication therebetween. The plate 40 has
another opening at 42 registering with the duct
35 through which cooling water is supplied under
The" openings 43itand“ 44‘ are: located.
at any levels. wli'ereztiieyare foundidesirableto
‘direct ,tiieJcircuIatiOnibetweenicavityj 30' and‘ cav
_ ity~ I5‘, tliesetcavities~ now being partiallyJsepaa
rated'irom‘ each vo‘tlienby-tli‘e partition“ plate. 40'.
Where *the'modi?ed femb'odiment‘rshown ;in- Figs?
5" and‘ 6-’ is, employed," the'pressuretcircu'lation*will?
b'e " con?ned "t'o. cavities ‘3D,? and’ I 5}. originating‘ . in‘v
v the former. The'cir'cula‘tiow'between' cavity‘ |5*
and cavity ‘ 'I 'willibeemorerrestrictedl bytlie- fact“
that“ only: two= ports are eprovid-edi-i at" 24¢- and* 25
Between" these-‘1 cavities:- Withtthié‘ arrangement,
a very»*- precise control‘; of3 temperatures under‘ all?
operating conditionssmay be=acliieVed§ Obvious-'-v
gineiandeeyenif aiL-such heatfcould,be-vremovedw
ly;1theinumber1ofivertical; longitudinal: partitions;
haustside. would. not... seriously impaii; combus
vidé additional‘fcontrolia Howevem' Phave; found?"
theecont'rol a?ldrded Ibyttie‘: structures v‘herein dis;
closed to': bemompl'etelyz-"adequate'iforfall practical“:
purposes; it'being understood, of :? course; that;
the resulting coolness.- Of'fthB‘Bi'lEjIlGm?t:the-BX§tion.»
may: beimultiplied?'to?any: extent: desired" to‘ pro“
At theeintakee sidezofttiie enginegethe require»
ments: are different};sinceeexcessiveicoolingf o?the:v
mixture? supplied;fromrithesoranktcasee 4 through:
the: transfer: manifolds’. and? 6" would? ‘impair?
combustion; Qn=.the;ot-herrhand;.excessiveeheatv ,
ing of the mixture in the transfer manifolds-j: ‘3
and; I‘r': wouldzea-lso. impair»: comhustionn. Conse
quently: f airly; closer regulatiomoiy theztem-perae:
tures: onlthezzfintakeaside ? Ofi' the: engine cylinders
I have found that such regulation cam bear’ ~
achieveduwithin;theanecessazwlimitssmtirely au
througir- wliich'?i tires. CDRVECti'OI'l'? circulation‘ may!
occunwill bemhangedmsmeqniredi.
It will :‘ be?‘ nnted'i that iva'll f ori’ithe?-rcirculation is ;
achieved‘zandicontiolledeWithin._;the::cylinden block:
and: its. closuresrso: that; the: external:. design? is;
smooth aznctzfreerof; piping: Thezwedge shape:
.¢ provides: an excess:o?icoolingrwatertatsthe crankr.
casez-zend'iof vthe sblockgttherebyrlteepingzthe prank;
In: all off‘: the. constnuctlonst herein; disclosed;
tomatioallyrbmeravity circulatiomofzicooling-rwaa
test between; th :cav-ityr I
accordingcto xvariationsrin~=rengine powerfan-ct~ de ‘a
sign; thef-size; number:andrdispositionsr of ports'1
onplthez. exhaust: side:
the: cayit
theeintake'; side": , :the: en,
gines Some: off the cooling’: water:
towpreventzthez intake fromebeuoming oyercooled,
through‘: the- duct-s .34; 357i.
flow: through-ether
ori?‘cev 2'4Iiin the'vlower partition. 2211mm; cavity;
1, displacing the water heated;vity:1ito:.
isi-also aamatter. otfthev greatest-importance from:
the "Stétl'IdIlOiHt-vOfr controlling‘; era-rile. case‘ temper.»
.causeithe hottestfpartiofrsuch watenzatfthe tbp -.
the. crank‘. case». isvundulys cooled», it-I. condenses;
the~~cav~ity,r" torl‘escaper through‘. the ori?cei 25:‘.
b‘aclil'into' th’espressure circulatedé'water inrcavitye
it runduly; hot,‘ iteexpands; too-much with-s consesv '7
I 5:‘- I The? warmerl tliei-watervbecomes: in l-cavity f‘I’;
the'more? rapid1wi-ll?be*<it_s gravityJcircnlation and"?
the~convection-current-stlius establishediwill tend?
ttrregulate the temperature’ in‘l-cavityi'l'iautomat?e
ically;; andientirely; irrespgectivevof the": rateeofl
ture in a two-cycle engine.
mime-mixture in‘
quent ~loss.v of.‘ power.»v The -control-imade. possible.
by the present invention enablestthe:regul-ation
notonlyw?.theltemperature inlthecylin-d'eir block
itself; butaalso the; regulationloi.crankacaseetem-I
peratures, these latter; beingpnedeterminedaale»
most entirely by the extentlto whichmeatdevel
circulation throughithe" cavity, I 5;‘"so~longeas*th'ef
opedninr the; cylinderseisepermittédi to escapesto
latter. is adequate: Ina other-words; all ‘:that," is
In ~.all. Iembbdir'nentémtithe ‘inventioniitisepree
necessary -is‘_to~mainta:in :an' excess» of ‘circulation
ferredgthat'lall‘pavitlés oil'tlieewatenjacket’s' face;
o?coolingjwater throughicavity" I;5“1to~insure~that* 71).. he
self-ldi'aining. This is' particularlyiihpprtantl
therewilhalwaysilie vample coolant‘ ‘inthaticavity:
inputboard rmotors .andeother, engines. which; are
Thereuponpthe convection: currentsrwill autoe/
matic‘alliz. insure P1‘0P?I'.'t@mREr8JillI§-$ Let; them»’tl'iel.mctorr.
exposed‘ to sub-freezing temperatures... In‘lthe.
devices herein disclosed,;tli'e port”2‘4..'is"locatéd'i
7.5 v at‘i-th'e; bottom: off'cavity; ‘I, tan’df‘the; ports. 35?
mosses .
' ~5;' An-engineficylinder block comprising a" pair
3'] are located at or so close to the bottom’ of cavl'
l5 as to preclude any possibility of ice damage.
of'superimposed horizontal cylinders having in_-j
take’ manifold means at'one side and exhaust‘
means at‘ the ‘other, together with jacket means
enclosing" the cylinders and providing cavities at
Thus, whenever an outboard motor equipped with
an'engine cylinder block embodying this’inven-l
tion is not in use. its entire cooling system will
be drained substantially completely.
H‘ ‘Y
the intake and exhaust'sides of the cylinders, said
jacket means being connected to the top of the
‘ While my improved method of cooling is-be
upper'cylinder and the bottom of the lower cyl
lieved to have been fully described in connection
inder whereby to measurably partition said cavi
with the apparatus, it may be summarized by '10 ties from each otherjsaid cavities having re
stating that I deliver coolant under pressure to
stricted communication-above and'below the cyl--'
the exhaust side of the cylinder block and‘divert
, inders, and; means for the pressure circulation of
a portion of vthecoolant to ?ow by gravity as- a:
coolant through one of said cavities, the other
convection current for coolingthe intake side of‘
cavity being adapted to receive coolant through
the restricted communication means aforesaid.
the cylinder block. As above described, I may
subdivide the current into as, many separate .
streams as may be desired, any number of which;
6. In any engine, the combination‘ with hori
zontal cylinder means provided with intake mani
may be circulated under pressure, and'any num- '
fold rneans at one side and with exhaust means
at the other side, of jacket means providing cavi
ties respectively disposed at the intake and ex
ber of which may be circulated by convection,
according to the cooling effect desired. It is im
portant, however, that the convection currents
haust sides of the cylinder means, said jacket
are, in each instance, diverted from the pressure ,
means being connected with'the cylinder ‘means
inder means wherebyisubstantially,to' partition
circulated currentsso that ino'separate source is
longitudinally thereof above and below the‘cyl
' the respectivecavities; from each other, the con
nection between the jacket means and the cyl- 1
1. In an engine, the combination with an en‘
gine cylinder, of jacket means partitioned verf
inder means providing upper and lower ports af
tically' into a plurality of compartments, said
fording ‘restricted communication between the
jacket means being ported to
cavities,'means for supplying coolant
communication between compartments at upper
under pressure to the cavityat the exhaust side
and lower levels, means for introducing coolant 30 of the cylinder means and for discharging such ,
into one of said compartments and discharging;
coolant from said last mentioned cavity, 'the'
coolant therefrom, at least one other compart
‘at the intake side of the ‘cylinder means‘
mentreceiving coolant at least partially by cone
receiving coolant‘ by convection circulation from
the cavity to' which coolant is‘ supplied, ‘under
2. The device of claim 1, inwhich the cylinder
has intake and exhaust sides, and the partition
mean-s extends longitudinally of the cylinder be-‘
tween said sides, the compartment receiving
coolant‘by convection being located ‘at the in'_-'
take side of the cylinder.
> ,
said cylinders and across their ends and beneath
webs connecting the jacket with the top of the
' upper cylinder and with the bottom of. the lower
cylinder, said partition webs being ported above
and below the cylinders to afford restricted com
munication between jacket cavities at opposite
sides thereof, a removable closure for a jacket
tion circulation means affording communication
between said cavities at verticallyspacedj points
whereby a thermal convection current‘ will circu‘é
late through the cavity at the intake side ofthe
cylinder, a' portion of the coolant circulated
cavity at the intake side of the cylinders, said
closure? embracing saidvmanifolds, a' jacket clo
sure-forthe cavity at the‘ exhaust side of said.
‘ cylinders, and means for supplying coolant to the
I last mentioned cavity and discharging coolant
8. The device of claim 7, in which said-jacket
is wedge shaped and the respective closures ‘are
' >
> 4L In an internal, combustion’ engine cylinder
convergentaway from the crankcase end of the
block comprising a horizontal cylinder having an
with .
intake side and an exhaust side and provided
jacket‘ means affording cavities at the respective
jacket, whereby to afford additional cavity‘space'
60 at the crank case ends of’ said cylinders}
9. The device of claim 7, in which a Web in
tegral with the jacket encircles the exhaust
sides of the cylinder, partition mean-s between the
cylinder and the jacket means longitudinally of
means and partially subdivides the exhaust cav
ity, the closure for the jacket cavity having
' the cylinder at the top thereof and provided with.
a port a?ording restricted communication beg
means engaging said web and. constituting a 010-.
tween the respective cavities, means affording re:
sure therefor.
stricted communication between said cavities be;
low the cylinder, and means for circulating
coolant through the cavity at the exhaust side
of the cylinder whereby primarily to cool the ex;
haust side of the cylinder, while affording means
10. In an engine, the combination with a cy1-.
inder block unitarily providing at least one hori
zontal cylinder having an intake manifold and
for the establishment of a convection current di
ve‘rting a portion of the coolant from the cavity
‘ at the exhaust side of the cylinder through the
cavity at the intake side of the cylinder for the
said cylinders back to said connection, partition
connected withthe cylinder longitudinallythere-i
' regulated cooling thereof.
connection for said cylinders‘ and extending above
inder having an inlet side and an exhaust side,‘
and a jacket providing cavities at the inlet‘and
Iexhaustsides of said cylinder, ‘said jacket being
through the cavity at the exhaust side.
‘other, of~_a jacket faced to provide a crankcase
3. A cylinder block comprising at least one cyl
cylinder, said block being provided with convecé
a fold means at one side and exhaust means ‘at the
of whereby to partition from each other there
spective cavities at the intake and exhaust sides‘ »
of the cylinder, and means for circulating coolant
through the cavity at the ‘exhaust ‘side of the
7. In an’ engine, the combination/with a plue
rality of horizontal cylinders having‘ intake mani- ,
an exhaust port, and a web surrounding said port
to provide an exhaust manifold, and a jacket
extending above and below 'said cylinder and
across the end thereof and to which said Web is
integrally connected, said jacket providing a cool
ing cavity at the intake side of the cylinder and a
cooling cavity at the exhaust side thereot. and
side, said method; mmmising circulating coolant,
to close the respective cavities, the closure .con
under pressure. about the exhaust side ,of_ said
cylinder. diverting a portion of said coolant tor
the intake sidecf said ‘cylinder and circulating
thediverted portion oi said coolant by CQHYBC!
said block being provided with ports .a?ording
limited communication between cavities above
and below said cylinder, of ‘closures removably
connected with the jacket portions of said block
tion, whereby an increasewin temperature in the
nected with the block to seal the cavity at the e-X-_
intake side of said cylinder will accelerate the
haust ‘side of the cylinder being provided. with
means engaging said web to constitute therewith
flow of the diverted coolantg ‘
16-. A method of controllingthe temperature
an‘ exhaust manifold about which said last men
of different .porticnslof an internal combustion
engine cylinder, which method consists in sup-l
plying coolant. under pressure, diverting pcrtiqns
tioned cavity extends, and means for supplying
and discharging I coolant to and from the last
mentioned cavity, the cavity at the intake side of
the cylinder receivingcoolan-t in restricted vol.
ume by convection ‘Currents through the upper
andlWernor-tions aforesaid,
of said coolant andvcirculating said ,portions'by
pressure and gravity respectively about speci?c
ill. The structure de?ned in claim l?r-wherein
a '
and below said cylinder», a coolant circulation
block whereby toincr-ease the capacity of said
compartment, at least one ‘other compartment
receiving coolant through said ports 'by convec
tion circulation from the coolant in the com--v
partnient with which such inlet and outlet
manifold and the capacity of said last men
xl3’. In an engine, the combination with 'cyl-.
inder ‘means, of Jacket means provided with a
cylinder ‘means, said jacket means providing
cavities at opposite sides of the} cylinder means,
and the cylinder means-having intake means ‘extending through one of said cavities and exhaust
means extending through the other, removable
closures for the respective cavities in operative
connection with said jacket means, the closure
‘for the cavity through which the exhaust means
extends being provided with a registering closure
cavity, a ‘partition plate between the closure
cavity and the Jacket cavity through which the
exhaust means extends, said plate being ported
to a?crd restricted communication between the
closure cavity and the cavity‘ last mentioned,
and ;means for introducing coolant into the
closure cavity and (discharging coolant from one
of the two cavities last mentioned, a portion of
such coolant fbeing diverted by convection
through the cavity through which the intake
means extends.
plurality of compartments, said block and jacket
means being ported to afford restrictedcom
munication between such compartments above
inlet and a coolant circulation outlet for said
cylinder jacket both connected to the same
' spaced‘web. complementary to the web'rof said
vertical partition extending longitudinally of the
for ‘suchwcylinder partitioned vertical-1y into .a
.12. The device of claim 10, in whichthe clo
sure for the cavity at the exhaust sideof, the-cyls
inder has {a peripheral ?ange, and an inwardly
tibhed cavity.
an engine, the combination of a block.
providinga horizontal cylinder and Jacket means.
the means for supplying and discharging coolant
comprises 31391765 in said block at opposite sides of
said manifold.
portions ofl-said-cvlinder-
14. 'A method ‘of controlling the intake tem~
perature of a water cooled internal combustion
engine cylinder having an intake side and an
exhaust side, which method consists in the torced
circulation of coolant about the exhaust side 4
of said cylinder and the convection circulation
of coolant about the intake side of said cylinder.
15. The method of controlling the intake tem
peratures of an internal combustion engine cyl
inder having an intake side and an exhaust 60
l8. ~Ina-n engine, the combination with ‘an
engine cylinder arranged to begdisposed .hori-;
zontally in operation and ‘having an inlet port
on one side and an exhaust port on the other,
of jacket means enclosing said cylinder and pan
titioned vertically into a plurality of compart
ments, one of which is on the inlet port side
and the other on the outlet port ‘side, of ‘said
cylinder, said jacke'tmeans being. ported both
above and below the cylinder to ‘afford restricted
communication ‘between the compartments ‘at
upper and .lower levels on the opposite sides of
the cylinder, means for introducing coolant into
the compartment on the exhaust port side of the
cylinder and for discharging such ‘coolant there-g
,from, the compartment on the inlet port side of
the cylinder receiving coolant diverted from the
coolant in the exhaust port compartment at least
partially by convection.
19. A method of controlling the intake tem
perature of a water cooled internal combustion
cylinder having an inlet side jacket compartment
and ‘an; exhaust side .jacket compartment, which
method consists in mechanically circulating
coolant through the exhaust side jacket come
partment and diverting a limited quantity of
coolant from ‘the exhaust side .jacket comparts
ment and circulating the diverted quantity of
coolant by convection about the intake sidejacket
; Y i
i _
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