andre_k

iTrader: (2)

any one know exactly what will have to be done to a standard 1.8 zetec bottom end to convert my turbo to zvh.

dont want to spend a great deal so no low comp pistons yet, how reliable are the head gasket spacers plates, or even a thick copper head gasket to lower the comp and block the relavent holes...

what will have to be done with regards to the oil feeds for turbo etc basically everything ill need to do to my standard block.

gavintwopies

Theres no need for a thicker head gasket or skimming the pistons if you dont want to as if you assemble the engine using a std 1.6 cvh head gasket and the unmachined pistons this will run 8.5:1 compression ratio a little up on what is ideal but you will have the ability to run up to a maximum of 20psi.
i have this done too my own car at the moment running a 1.8 engine, k and n filter and a scorpion exhaust with a chipped ecu running 14psi and it puts out 147@wheels /180@flywheel.

there is no other mods done to the engine its just std. the cam the head , the pistons etc etc.

However my m8's on the other hand that i made has a hybrid turbo , kent cam and a big valve head running 18psi was running 195@wheels or abround 240@flywheel quite a difference.

S1 Barkham

Also if you was to use the mondoe 2.0 litre bottom end you can run standard Calibra turbo pistons (C20LET) and it will run with the ideal low compression, no need to fork out £500+ on a set of mahle pistons

ON-UJAH

LET pistons bring the CR down a little too much - good for Zetec Turbos. C20XE (redtop 2l) pistons will get you down to about 7.8:1 on a 55cc CVH head. You will need to machine the little ends for these so it will start getting more expensive. Oilways also need to be drilled in the pistons as the Vauxhall pin floated in the little end, unlike Zetec pistons.

4 oil returns need blocking, water pump needs a plate (ebay), and engine mounts need some modifying.

There is more but that is the basics. Check the Jim Hearne Quantum site for more details.