jonny s2

iTrader: (12)

i know zetec turbo's have been re-bored to an 86mm, but has anyone done one to say an 86.5mm bore or over??

just want to know the safe limit

cheers

creator

I think cgi blocks are bigger but they are linered

focusrrx87

mine is 86.5mm mate, accralite piston's but others like PEC do them that size to.

muz

I was speaking to a chap a while back about this who had the Orion on a forged 2.1 Zetec on throttle bodies with 8 injectors and he said, like the Evo engines he believed they could safely be bored and stroked to 2.3/2.4 litres. Not sure if he ever did try though.

clarke5700

Not all of em

Canada1

I would have the cylinder walls sonic checked for thickness.
Sonic checking engine blocks before boring oversize is a good idea, as some blocks have core shift where some cylinders have thicker walls and some very thin.
Also major thrust side requires more material 4 to 5 mm.

I am sure the top engine machine shops do sonic mapping of cylinder walls?

jonny s2

iTrader: (12)

Danny, ive heard you have to get liners for those blocks

cheers mate

i know who your on about, he broke it up tho, ive heard this before 2.2/2.3??

something to look into i suppose, i would of thought 86.5mm would be ok, but id like to know how far they could be taken out

creator

Are you planning something jonny

jonny s2

iTrader: (12)

creator

Rob_DOHC

iTrader: (4)

If no one knows what a max safe size is Canada1's advice on sonic some times called ultrasonic thickness testing will tell you for sure, if your planning something fun

Rob,