high engine speed. lf a Holbay head is used with an

The drivegearitseifis fairlyeasyio
change,it is securedto theoilpumpshäft
bytwocross.Jrilled
pinswhichhave.iobe
drivenout.
The 1725cc(SVor Hunter)camshaft
canin thiswaybe fittedto earlier1592cc
The"high
!!0i1es withverygoodresutrs.
lift"Hoibaycamcanbefittedlo anyengine
but may requireaiterations
to caö and
distributor
settings,especiallya 15g2cc
engrne.
Newfollowersmustalwaysbe used
witha newor reconditioned
camshaft.lf a
camshaftis takenfrom anotherengine,
and its {ollowersare in good condition,
theycanbetransfenedbutMUSTbekeot
in their same positions.For a standaid
camshaft,
usedfollowersingoodcondition
'reconditioned"
on an oil stoneis a riskier
butcheaperaltemative.
Notethalfollower
Er]lo4sl0.06"
facesareslightlydomed.
To beonthesafesideit is alwaysbest
to buy an exchangecamshaftfrom a
highenginespeed.lf a Holbayheadis reputablesupplier(l can recommend
usedwithan inletmanifold
andfit usingnewcamfromanAloine "Piper"camshafts)
the portsin theheadmustbe openedout followers.
A goodgeneralroadcamisthe
to the same size as the inlet manifold "Piper2RG"anda good"fast'roadcamis
used. An unmodifiedHolbayheacjcan the "Piper2RY".Theseare availablein
foryourowncalTtshaft
only be usedwith its originaltypeinlet exchange
in15g2cc
manifold(twin40 DCOEWebers).
so avoiding
theoil
Ascan and 1725ccversions
be seenit is possibleto tunea goodlate pumpdriveproblems.
pattemheadto beas goodor betterthan
Although
theSltoSIVengines
canbe
a'Holbay"butdonottry it uniessyouare very
successfully
tunedfor roador raceI
confidenlof your abilityas new heao's have
had by far, more enquiriesfrom
comeveryexpensivei
peoplewishing
to fita complete
'Hoibay"
There have been quite a varietyoi to their Alpinethan any otherform of
camshafts
fittedtothe15-c2rcand1725cc tuning.I thereforethink it would be
enginesbutwe areonlyinierested
in the
Forroad-use
I don'tccnsicier
it necessary
to "balancs"
theengineas rheenginewiil
developitspowerwithouthaving1opush
it to veryhighrevs.
YoucanusetheHolbaysumpora SV
sump,the oil pumpsare identical.
The
Alpinefrontenginemountingplatemust
befittedto theHolbayblockin placeof the
original.The Alpinebottompulleyand
waterpump
mustalsobeused.TheAlpine
(SV)oilcoolerwill
mateupwithlheHotbay
oil filleradapterbasewhichis fittedwith
an oil temp gaugesender.This sender
candrivea newgaugefittedto yourdash
or evensimpleryoucanfil a smallswitch
sothatyourwalertempgaugecanbefed
fromeitherthewaterlempsenderor the
oil tempsender.Labelthe switchclearly
though!
You can use your originalAlpine
flywheelandclutchif theHolbayonesare
worn but it may not last long becauseof
the extrapowerof the engine.The SV
clutchis only7.5"diameter).
TheHotbay
clutchis 8.5 " diameter.Fit the Holbay
flyrrheeland clutchcoverto all Alpines
withsynchromesh
on firstgear(lateSIV
and all SV).All earliernon-synchro
first
cars have flywheelsthe sarne as the
Holbay,onthesecarsuseeitherflywheel,
whicheveris the leastworn.Theneither
fit the original
Alpineclutchcoveror the
Holbayclutchcover,In the caseof the
Holbayclutchthe latersmallerdiameter
caöonrelease
bearing
andclutchrelease
armfromtheSynchromesh-first
Alpineis
alsonecessary.
Whichever
optionyou havechosen
(apartfromthe standardSV clutch)you
now havea 8.5"dia flywheetanda 8.5"
clutchcover,ail you neednowis a 8.5"
Tlmtag {20 Thou. Clearance)
AIroY
HEAD E:tGtNEs ONLY
'BT.D.C
'A&D.c
'B.B.D.C .AT.D.C
clutchdrivenplate!For all Alpinesup to
com uft
Valve trft
SV chassists395017308
usethe8.5"dia
j,l
All Alpines up to SyocromeshSlV
Triumph2000(orVitesse)drivenplate.
JZ
)O
tU
260"
.350"
Syncromeh SiV :rc SingleCeö l7?5c
:9
Jt
ol
l)
?60"
.350ForSV after8395017308
usetheHolbav
Hu n te r
Rapieror HunterGLS8.5"platel
5V AJpine.Twin Caö Hunrer 1968-72
29
63
69
23
.?98"
.405'
Sunbeam VEiJEZl..il592cc 196361
Wenowcometo thecylinderhead.,At
?9
.298'
Hoibay H.120 and Hunrer GLS
41
51
69
26
.320
this point you must choose which
Single anciTwrn Carb Hunrer l,9?2 ro
to<"
l8
.,100"
caöurettorsare to be fitted.lf originai
5eries 7
Alpine
twin Zeniths, Strombergsor
Single and Twin (irb Hunrer Sene 7
24
46
58
12
.295"
400Twinchoke
Solexor28136
Harringron 'Le Mrns ' FacroryStageit:
Webercarbsor
25
59
63
21
.298"
.405original
manifolds
areto beused,thenthe
Hper2RG(9as€0 1592c&1725<.
37
/)
t5
3t
.zöo
387'
inletportsmustbegroundoutto"standard"
Bper ZRY(Sagcit11592a & 1725a
32
68
68
32
430'
sizeasmentioned
eariier.lfawater-heated
manifold
is usedtheheadmustbedrilled
and tappedto takethe returnwaterilow
alloy head versions as camshafis irom worthwhile to detail what exaclly is
fromthe manifold.
All of thesecarbswill
ironheadenginesare not interchangeable involved.
requirere-jettingon a rolling-road
test
with alloy head camshafts. I have listed
bed.TheZenithCarbs(Slto Slll)willbe
First, find a 'Holbay" enginel These difficult re-jet
those of interestabove:to
as they are so old now.
A ll alloy - hea d c a ms h a fts a re were only fittedto the "H120"Flapierand
Most twin chokeSolexcarbswill have
'GLS"
Hunter.Makesure that you get the
i p t er c hangeable i f o n e p o i n t i s
beenreplaced
bytwinchoke28136
Weber
remembered.Allcamshaftsfittedto Series distributor,flywheel,clutch,inletmanifold or 'lhe twinStrombergs.
Do remember
lV and earlier(1592ccengines)needan and carburettorswith the engineas these however,
thatwhenthe chokeSolexis
oil pumpdrivegearwith 13 teeth (13 te€th can be usedon yourAlpine.The geaöox,
replacedbyrhetwinchoke28136Weber,
on cam, 13 teethon oil pump drivegear). exhaustmanifold,bottompulleyandwater- the inletmanifold
mustbe ground-out
to
All camshaftsfittedto Series V and later pump cannot.
thesizeoftheheatinsulator
suooliedwith
Hunters engines(1725cc\ have 12 teeth
theW€b€r.Theoriginal
(between
insulator
Secondly, unless the engine is in
on camshafl and drive gear. Thus il a
for theSolex
exceptionalcondition,strip il down and thecaö andthe manifold)
1725cncam is fitted to a 1592cc enoine examine everythingfor wear. lf you are
hastoo smallan air-passage
in it.
(or vice versa)the oil pump drive geai (at lucky you will only have to de-coke the
Thealtemative
toiheabovecaöurettor
the top end of the oil pump) must be fitted head and fit new piston rinos and is1ousethetwin40 DCCEcaösfromthe
loo. Unfortunalely
lhe completeoil pump crankshaft shells. Heoolite "Aöex" oil
Holbay engine.These are the best
assemblycannotbe swappedas it willnot controlringswillcopewith borewearof up
carburettorsto use for Dowerand if
fir.
to 10 thou,abovethis you must re-bore. correctlyset up aresurprisingly
.9 J)
i,
LJ '
\t
lQ
ZCC
Jl )
,o
drts
/rith a
s in the
,s uit .lf
t Kaith
78!
oingto
y head
cannot
ith the
;elfwill
dasit
rst cut
anifold
anifold
t both
you havea smoothprofileagain.Nowwe
can turn to the carburettor.You must
removethe largeairiilterbox and remote
filter as there is no room in the Alpine
enginebay to fit them.You mustrunthem
withopeninlettrumpetsorsmall"pancake"
air filterswith trumpets.Open trumpets
willgivemore powerbut alsomoreintake
noise. I have driven over 70,000 miies
with no air-cleanerand no adverseeffect
on the enginedue to the dust,etc. lf you
of the
pancake air{ilters you must remove
rgdisc use
the
'castellated" spacers between the
lresl.t"
=öurettor lid and float chamber cover.
tl ta
(Undothe brass wing-nuton top of each
edand
carband removethespacersundemeath).
el and
You must now drilla ventilationhole in the
a n g9.
inlet face of the caö body to allow the
filetha
pressure to equalize between the float
ne two
chamber and the inside of the air-filter.
t oa
The size and positionof the hole can be
dingis
seen from the fact that thereshould be a
t know
;uffers matchinghole alreadyin theair-filterbody.
water- The removalof the 'castellated"spacers
20 as
and drillingof the hole isonly necessary
:inally,
wh e n us ing panca k e a i r-fi l te rs o r
s weld carburattors originally from a genuine
s until 'Holbay' engine.Weber caös from other
makesof car or boughtnevl,needno
modification.Carburettorswith open
trumpets
arenotaffected
by themethod
of floatchamber
ventilation.
Depending
on vrhichinlet manifold
you use and the individual
dimensional
tolerance
of yourparticular
caryou may
haveto shortenthe carburettor
trumpets
andauxiliaryventurisso as notto foulthe
innerwing area.Approximately
halfan
inch,is
allthatis necessary
in mostcases.
The trumpetscan be cut and then
'soldered"
together.
Theauxiliary
venturis
cansimplybe cutdownandthe cut-end
reshaped
tomatchtheoriginall
Shortened
trumpets
andshortened
auxiliary
venturis
canbe boughtnowbutin thecaseof the
auxiliaryventurisa standardlengthbut
smaller
diameter'3.5"
venturis
should
be
specified
insteadof the extended
length
"4.5"venturisfrom
andstandard
diameter
theHolbayengine.
Forthereasonofcost,
i recommond
thatyousimplyshorten
the
standard
Holbayitems.
The Weber carbs must be flexibly
mounted
totheinletmanifold
usingspring
washers
andrubber'O'rings.
As a guide,
you must leavo approx10 thou gap
between
thecoilsof thespringwashersto
tt
TT
- 1, 5C
sEcl'oN 3 (ENOINE)
/u lj*
.\
A^
tr
/)
tt
I I
I I
\-) C N)'nt'rft
U
f-
llrtTo,^/rt,2
7 i7
qö
50741
SAOC - THE ALPINEGUIDE
PowermaxRacingPistons.What ever
you decide on, You must have the E ^r
andpistonsbalanced
örankshaft
, flywheel
a HolbayE128
shop.Obtain
bva machine
camshaiteitherthroughyour Chrysler
Cealeror directfromHolbaythemselves. 28la
llris is theultimatein Chryslercamshafts lha
:nd evenhairierthanthe normalH120 US.
cam.
Fit the cam and use new cam We'
F16 +3q
Tube
Emulsion
throughoulNowfte onlydifficult the
followers
175
AirCorrection
.2
bir.'
adv
45F9 S0 T 4/1
Stowrunning
A 1600ccoilpumPgearwon'tengage moi
45
PumpJet
the E128cah, and a 1725ccoil PumP
won'tfita 1600ccengine.Don'tpanic'the
Floatlevel 7.5mm
CH
is cheapandquiteeasy.Goto the
NOTE:Late Holbayengineswere fitted answer yard andget an oil pumpfrom MA
shortauxiliary breakers
withthe3.5smalldiameter
gearisfixed co
life any1725öcengine.Thedrive
making
{ortheAlpine,
needed
venturis
to ihe oil pumpshaftby two steel rivets. SL(
easierl
File off the ends of the rivets and drive
distributor themoutwitha nailandhammer,remove P U ,
Usethe standard'Holbay'
thatyou fit the beveldrivegear.Do the samewith PU
but I do stronglyrecommend
electronicignitionand 'Colder' plugs' your16OOcc
pump.Frtthebevelgearoff
ChampionN7Y insteadof N9Y or lor ihe 1725cciump to the 160o unit and fha
BP6ES".Other reolacethe rivets.Filthismade-uppump pier"
reallybestresults'NGK
changesare:
worthwhile
td'tne engine.Obtaina Lucas 431D4 isn
(a) 88 degreeC thermostat
distributoränd fit it to ths enginewith a on;
172lccadaptor.lf youhavea cabladrive hel;
(b) Electriccoolingfan
willhavetofitanelectronic
ravcounteryou
il model.
ona rolling-road
(c) Finalsetting-up
the budgetcanstretch.
No
Nelit comes the head, You ql
,.^m
+L'^ aronor{inn
aann
A
ha
allo:vior flexibility.A gccd stariingpcint
ior Jetsin tnin Weber40 DCOEcaös for
an Alpineis as belol:Auxiliary\/enturis,3.5 (siandardlength)
or 4.5 (extended)
30 mm v'LfainVenturis (choke)
120 47.O
M a i nJ e t
^
^-^