distance between head and piston
Turbo Mini Forums

hello,
someone knows what is the distance between piston and head when omega turbo cast pistons are fitted.

I calculate 0.8mm with standard hepolite.
Thanks.

French turbocharged 998cc

Which cam and rockers are you using?
Any mods to the ehad or block? Skimming?

Cam is avonbar phase 2 and rockers are standard.
Head is the standard metro turbo.
Block is standard metro turbo.
Head gasket is standard paken540.
Pistons will be omega fast road i think???

I don't rockers or cams will change distance between head and piston.??

French turbocharged 998cc

AT full lift they will, because the valve lift is bigger on aftermarket cams (normally) Also, 1,5 rockers will lift the valves 15 per cent higher than 1,3 rockers.

With a standard head and block, there is NO WAY that the valves will hit the pistons in a turbo engine. This only applies with seriously skimmed heads, decked blocks and savage lift rates.
I just built a 1191cc engine for a friend of mine. The pistons protrude0.2mm over the block, the head has got 15cc chambers and aSTR930 camshaft. Even on this engine we did not run into trouble with standard pressed steel rockers.
We're close though :)

thank a lot.

In fact, I d like to know what is the compression ratio when you fit the engine with:
-26cc chamber+gasket
-standard metro piston AND fast road omega piston.

French turbocharged 998cc

vegard was the 1191cc engine an overbore'd 1071? i forget the cc's nowerdays, but if it was a overbore i'd be curious as to what you did about the head gasket with the pistons protruding above the block surface?

sorry im going o/t again

Edited by andeh on 4th May, 2005.

I've seen the future and tbh its Pie

It's a SA 1071 cranks which has got 70,2mm stroke, and 73,5 bore. We just used a milled down A block. The head gasket is bigger than 73,5mm, so no problems there.

interesting! i was informed that the normal head gasket overhangs the cylinders on a 73.5 bore? Im presuming you used a different head gasket?

I've seen the future and tbh its Pie

Bk450