turbo.jon

Hi ive bought a set of cosworth racing pistons from burton power for my cvh rst there oversized by +1.5mm but do they need tops machining to get right compression.if so how much need taking off???
i will ring burton in morning but have not had time just thought i would see if anyone else would no...

cheers
jon

Matt

1.5mm overbore on a high power cvh??????????????????? good luck. forget the pistons what about your block pal

Ginge !

all cosworth racing pistons need the tops machining they only come unfinished


speak to em in burtons and they will sort ya out , theres a guy there who owns a fiat uno turbo, hes a good bloke, speak to him ( can remember his name and i speak to him alot at work

turbo.jon

Thats the least of my probs only want about 230bhp i needed a set of pistons asap could only get acralite ones and few people had probs with them so got these wont be running to much boost

Ginge !

think ya will find there a .5 over bore

oh and the pistons aint gonna be a problem


rods might be though

essexrsturbo

there top pistons, aint gona have probs with them, but would be a good idea to uprate to steel rods.

turbo.jon

think ya will find there a .5 over bore

oh and the pistons aint gonna be a problem


rods might be though [/quote]

Says in burton cataloge there +1.5mm oversized better be as i need a min of +1mm as block need rebore

Ginge !

read the box mate, that will tell ya, mine was a .5 over bore

Rick

They are 1.5mm. I know. And i know U wont have a problem with the block. From what u've said, u seem to be going into this engine build a little blind folded. Burton will not tell u how much to take off the top. What compression ratio have u specced the engine to? If u want 225 bhp, why bother with forged pistons and the increased problems they bring?

turbo.jon

Cheers mate im just leaving it to company thats building engine they recomended the pistons and they have done loads of mates cars just a well none local company.What kind of problems will i occur then???im after about 230bhp at mo then more in future maybe steel rods too
just want it back on road

Rick

Cosworth pistons are the best. But, the std rods need changing before u change to cosworth pistons, as std pistons will do over 250hp. Forged pistons are noisey when cold, and wear the block quicker. If all u want is 225 hp, then a std engine with stage 3 head and stage 2 turbo will do it no problem. Ask the engine builder what compression ratio u want (i'd advise 8:1) and then u can work out what to do with the pistons. Also, i need to have ur head CC'd.

Ginge !

top advise there rick , my box deffo says .5 though