vr6 block rebore size advise,

[powernut 1]

hi all some probley know i used to r32 turbo 4wd caddy , now im runing a 12v 4wd caddy , which ive dropped on 2 sets of pistons as ive decided to rebore the block

i have a set of 81.9mm/ 82.5mm and 82.9mm pistons which size is recomended over a stock 81mm bore

[legvw 0]

Go as big as you can, why not? I think there are a few on here that run 83mm pistons, on a charged set-up.

[matty.vrt 120]

big is better the vr6 block is massively strong

[powernut 1]

cheers, problem is these have 21mm wrist pins and stock are 20mm , i can buy 21mm con rod bushers but unsure if its a safe option , as ive run 12/24v engines 2.8/r32 turbos in 4wd 20/28psi vrazy fun on a gt40 and hx40 holset turbos, but i seem to have more luck with the old 12v tbh,

another couple of quickies engine temps so bloody hot under the bonnet fans are nearly always in , im thinking of fitting a lower 70deg thermostate and switch , but who sells them

and oil coolers do a lot of your guys run them , depending what spec turbo and boost you run//as keeping intake temps down is dam hard when trying higher boost leavls

[legvw 0]

I have read your thread on ukmk4's, its a good read!

How come they are 21mm? Are they different pistons?

Have you thought about bonnet louvres, or jacking the rear of the bonnet up to allow heat to escape?

An oil cooler will help alot if your struggling with the temp, dubpower sell 70deg thermostats-i did have 1 but don't use it as it over cooled on a long journey (motorways), and ran too rich. But might be worth a try!

[powernut 1]

nice one paul if you still have the thermostat ill buy it of you , let me know , regards bonett vents , liked the stock looking bonett tbh , but ill try the rear bonett lift, regards pistons yearh there from anothe rengine ,hernce 21mm wrist pins