JTECH James

iTrader: (13)

guys, my 200 block is bored to .5 already, and needs another bore, which would take it to .75

does anyone run a 500bhp T4 engine at .75? or do i need to carry on with my plan to thin wall liner the block?

RWD_cossie_wil

iTrader: (9)

didn't think they did .75 o/s pistons? Thought it was 0.5 and 1mm o/s? Can't see the problem running 1mm o/s pistons, I know of people who have run 93mm WRC pistons which is quite a lot over +1mm pistons.

Is your block long-studded? As that would be my major concern with a T4 engine.

JTECH James

iTrader: (13)

think they do a .75..?


its going for long studding,

i was under the impression the bore would get to thin going near 1mm oversize

rapidcossie

what thickness are the bore walls just now?

the one that cracked on m engine was only 3.5 mm thick so you want to try and be over 4mm.

JTECH James

iTrader: (13)

not sure euan,

what was yours bored too?

rapidcossie

my block is 0.25 over standard.

JTECH James

iTrader: (13)

and it cracked that?

rapidcossie

yeah it cracked the bore with the thinnest wall thickness.

Its one of the 99 blocks not that I really thick it makes any odds.

measure the wall thickness as blocks do vary and yours might be thicker.

JTECH James

iTrader: (13)

mines a old type block, fitted to the car when new.....

where did you measure the wall?

rapidcossie

rapidcossie

try to get down the water jackets surrounding the bores.

JTECH James

iTrader: (13)

thanks euan, il have a look see what ive got, otherwise i will get all four bores thin walled back to std size

rapidcossie

It might be ok as I had other probs on the engine that "might" have contributed to the cracking.

JTECH James

iTrader: (13)

bttt

JTECH James

iTrader: (13)

bump