Guide: How to build a K series motor

[oldcorollas]

probably.. my motor was pig rich and poor timing.
with a correct tune of the carby (ie changing jets on the dyno) and a better ignition curve, it would do better. i think your goal is realistic. with EFI it would be better tho

[ToDa30/4]

the weber 34DMS is proving hard to find .found one as soon as i have a bitch it turns up.

[oldcorollas]

any of the euro webbers would be ok.. main issue is that the primary choke is small enough... ie sayy 24mm or less. if you get the 26mm one in the 34ADM (falcon?) it's too big..
yar, 34DMS is not easy, but a euro wrecker dealing in early stuff.. or fiat/euro clubs, should be able to help with something similar...

you could go twin SU sidedraughts ppl have done them well.

[ToDa30/4]

single 40 mm side draft weber to big i guess

[oldcorollas]

not if choked down correctly i suppose?
the main issue is getting decent idle quality with lower idle vacuum from a bigger carb.

with a downdraught, you have all cylinders drawing thru one primary at idle. and a second throat to open up for high revs.
with side draught, you have 2 cyl drawing thru one throat, which also needs to deal with high rpm...

that said tho.. people can tune them to be ok.... i have not so much experience with the side draughts tho.

[ToDa30/4]

reckon it might be over kill & thirsty ,i'll go the 34 DMS, thank for your input , i'll go back to your corolla page now CHEERS

[SL666]

i had a pair of side draft 48's on a gemini 2l once.. (because i had them) it ran out of cam before the carbs really came on had a pair of 40mm dellorto's on it after that, they were awesome, i mean the engine had about 4 hp, but all 4 were available instantly

[Billzilla]

single 40 mm side draft weber to big i guess

We ran twin 45 DCOE Webers, with 37mm chokes on the race engine.

[74ROLLA]

I run a 28/36 DCD downdraught weber and have found it to be great. 26mm primary, 27mm secondary (found on old 1500 GT Cortina's). Jetted down to suit 4K, doesnt produce any more power, but ALOT more responsive . . .

[ToDa30/4]

OK bwaahaa the more i learn ,the less i kno , opinions on a single weber 40mm s/draft on a 3k with a 260/264 cam, later to be a 4K with a 3K head .or go 2 brl d/draft ?

[78Rolla]

Great thread! You gotta give it up to the bullet proof K series engines! never do you wrong...If anyone is interested I'm pulling out my 4k and 4spd gear box in a couple of weeks, so if anyone wants it - PM me...

[PMP020]

i ran a 32/36 weber froma 2l cortina motor jetted 2 suit 5k on my lil workd 4K.
that thing pumped ringys till the cows came home
the stage 4 waggot cam n extreme clutch helped alot
cough and the locked diff also cough cough

cheers scott

[oldcorollas]

i ran a 32/36 weber froma 2l cortina motor jetted 2 suit 5k on my lil workd 4K.
that thing pumped ringys till the cows came home
the stage 4 waggot cam n extreme clutch helped alot
cough and the locked diff also cough cough

cheers scott

and what were the AFR's on the dyno?

[PMP020]

hahahaha dyno.
u one krazy kat stu burger.

only built it 2 go round in circles not for any real powa figures of any sort.
but it was a rebuilt 4k block, 3k bigport head, waggot cam, 32/36 weber, pacemaker ext. 2" exhaust, elec dizzy, extreme clutch. wit t50 n locked diff.

the fun increase was worth the money.
cheers scott

[oldcorollas]

i was wondering because... almost any carb can run almost any motor... esp at higher rpm.. but that doesn't mean it runs well.. or as well as it could.
going in circles is fine for commondores and geminis, but corollas should be better than that

it's fine for people to say that the 32/36 runs a 4K.. and it will.. but the AFR's are crap because the little motor just doesn't pull enough air to have good idle (on the actual idle circuits) AND run well up high....
point of this thread should be a little more thought than the usual.. whack it on and hope it works