thewhitewarrior

hi,
im after a crank for a v3 sti with center thrust bearing, that will handle 500+bhp, anyone got any names and prices,
cheers phil.

merlin24

iTrader: (1)

Its not normally the crank which is the "weakest link" - its the standard 'nut' type rods.
The later V7 STi 'bolt' type rods were much better, but at that power you want the best forged rods you can afford to fit tbh.
Standard crank would take it but if you want to push the power much higher, then dig deep and get a Billet crank.

Mick

thewhitewarrior

thanks mick, i have the H-beam rods and getting forged pistons, its just the crank i need to replace, so is a standard v3 sti crank good enough for around 500bhp?

thewhitewarrior

anyone?

thewhitewarrior

???

banny sti

iTrader: (68)

Yes it is but for peace of mind I would go for the nitrided crank from a v9 JDM car, it is stronger and has better oil flow as it is cross drilled.

Banny

jabbawockymark

i have a roger clark motor sport 2.5 crank was £400 with h beam rods and woosner pistons this crank is very good but i wouldnt stay with center thrust i would have your block converted to end thrust but thats my thought thats what i had done when i had me 2.3 stroker fitted

thewhitewarrior

yes they are good, i had one of them in my other engine but ill need to have this engine macined to take the end thrust bearing and i didnt want to do that, is there anything with the mid thrust that are strong enough for 500?

jabbawockymark

you can get a v9 crank that are very strong centre thrust i had one in a sti running 450 bhp

i would of thought you will have to have your engine bored out to fit race spec pistons anyway?

thewhitewarrior

whats a 2.3 stroker, has it been bored that much?

banny sti

iTrader: (68)

You used a EJ22 block with a 2.5 crank, stroker rods and pistons to get a capacity of 2.35.

Banny

jabbawockymark

he got it fella

thewhitewarrior

aah, so is it possible to use a 2.5 crank on a 2L and bore it out to 1mm over? what length rods would that need?

jabbawockymark

yer my engine iam building now has a 2.5 crank then h beam manley rods with woosner pistons engine has been boored for the pistons this will be a 2.2 stroker with sti heads that have been ported polished also full race spec cams with high lifters so theres loads of ways of doing it

dazdavies

iTrader: (22)

You'd still need to machine the block for rear thrust.

If you're determined to have a crank big enough for big power but have a centre thrust crank then RCMS do a crank that will fit in either.

Be warned it aint cheap and you could get your block machined for rear thrust, buy the bearings, by a new 2.5 crank and still have a grand left over. Your best bet really is to just get the block machined. Most if not all the big power 2.35 have had this done so I dont see why you're against it.

dazdavies

iTrader: (22)

Didn't realise manley made stroker rods and wossner made stroker pistons.

jabbawockymark

yes mate they do i have them running in my car and 2 others the 2.2 stroker kit is very fast indeed

thewhitewarrior

i like the idea of that, the other block i have is a cdb thats been machined for the end thrust and bored .5 over, so may just bore that to 1mm, use the H-beam rods i have, then all i need would be a 2.5 crank end thrust and pistons to match the 1mm over bore, is that right?

jabbawockymark

well depends on what pistons you use some are 0.7 some are 0.5 some are bigger bore size so just depends on the piston wossners are very good just love the sound the make my car rocks when ticking over sounds very deep

thewhitewarrior

nice, aint it exciting when ya find out something new,
so is there any size difference in the rod length or would i use the same as the 2L?

jabbawockymark

well you can have standard size or go with a shorter rod like i did then you get more conbustion the more conbustion the better lol

thewhitewarrior

right, sorry to go on with the questions but i will go this way and need to know what im looking for, so where will i get shorter rods and what price? also the 2.5 crank, will it fit in the machined end thrust cdb i have with no probs?

merlin24

iTrader: (1)

If your going down the Stroker route Phil, you will need stroker rods and pistons (as you are increasing the stroke by 4mm with the 2.5 crank) as mentioned above,so try Mark @ Lateral Performance for a price on the parts.

92.50mm bore with a 2.5 crank = 2.1 Stroker.
97.50mm bore with a 2.5 crank = 2.35 Stroker.

The EJ257 crank is rear thrust so will fit your rear thrust block.
Early EJ25 cranks were centre thrust and had a 48mm big end journal - so no good for the 52 mm Impreza rods.

Mick

joz8968

iTrader: (13)

Mick, are the Blobeye "v.8" and Hawkeye "v.9" STi rods the "bolt" type too?

banny sti

iTrader: (68)

All newage rods are bolt type afaik, only the pistons were different from v7-v8/9

Banny

joz8968

iTrader: (13)

Cheers banny. :-)

Is it possible to swap over pistons WITHOUT unbolting the rods from the big end journals and extracting the rod/piston assy.? i.e. can you release/extract the circlip/gudgeon pins via that 'inspection' hole thing, so as to be able to extract the pistons out of the top of the block?

Or do you have to take it all apart (inc. crank) and always do a full, proper rebuild, etc...?

bluerigster

iTrader: (9)

You can remove the pistons without splitting the block.

thewhitewarrior

thanks mick,
you always explane things well, so if i bore the block a further .5mm to 1mm over it will be close to a 2.2 also?
thanks for the help , ill make enquires for prices.
phil.

merlin24

iTrader: (1)

No probs Phil - boring to 93mm should give you approx 2147cc depending on the build spec.

Mick