deck height

[mb911]

I measured deck height tonight and got .055 (In inches) I measure a stock sc engine I have also and that measured .075(in inchs)

just go through what i am dealing with is a the following

98mm JE pistons Low compression turbo application(8.0-1)
3.0 sc bottom end with no offset on the rods
92 cc twin plug sc heads

What are you guys shooting for for deck height ??


Thanks so much for your time

[Jeff Alton]

Time to CC the set up and adjust the deck height for the target CR. It is fun...........






Cheers

[mb911]

92cc heads I posted that info already

[ChrisBennet]

I shoot for no more than .040" (.1mm) per Steve Wiener's recommendation of .035-.040". I've measured higher on a stock 964 motor but your SC measurements seem kinda high.
Have you decked the case spigots yet?
-Chris

[Jeff Alton]

You still don't know what the CR wil be if all you have is the head volume. You might want to measure the piston dome voume as well.

Cheers

[mb911]

Originally posted by ChrisBennet
I shoot for no more than .040" (.1mm) per Steve Wiener's recommendation of .035-.040". I've measured higher on a stock 964 motor but your SC measurements seem kinda high.
Have you decked the case spigots yet?
-Chris

yeah nothing was machined just a change in cylinders . can I run with out the shim??? Maybe a 609 locitite to prevent fretting??

henry had spec'd these out as 8-1 CR with stock sc heads(The Je pistons almost are flat with very little dome and valve releifs cut in them already) which is pretty much what I have nothing was machined on the heads other then chamfering and the twin plugging

I should restate I measured the 78 sc engine my garage(stock motor) and that measured considerably higher then mine..

[ChrisBennet]

If you have the case apart you can have a local machinist "clean up" the spigot sealing surface. This will give you a nice "true" foundation for the cylinder+head+cam carrier stack and get you a better deck height as a bonus.
How are you measuring your deck height?
-Chris

[mb911]

dial cailper in 3 spots 120 degrees apart. Case is together now. I have read a bunch on this and allot of folks are suggesting that 1.2-1.3 mm is good to go for a turbo engine what do you think?

[ChrisBennet]

Originally posted by mb911
dial cailper in 3 spots 120 degrees apart. Case is together now. I have read a bunch on this and allot of folks are suggesting that 1.2-1.3 mm is good to go for a turbo engine what do you think?

Personally, I wasn't able to get good measurements using calipers.
-Chris

[mb911]

I will try the solder method.. I am not real concerned with valves hitting more so to control detonation Thanks guys oh and last question is why would that stock sc have higher deck height then what I have hear??