Flat Top Pistons
Do any of you guys know what the valve relief volume is on the stock L-82 flat top pistons?
|
I think they are 5cc's.
-Mark. |
Sorry to hi-jack the thread, but if you put on 70cc heads do you know what the compression ratio would be?
|
You can get it yourself using that online calculator :
http://www.csgnetwork.com/compcalc.html That way you can tinker with the best suited head volume/piston compression volume. |
Originally Posted by HamadUP
(Post 1567714566)
You can get it yourself using that online calculator :
http://www.csgnetwork.com/compcalc.html That way you can tinker with the best suited head volume/piston compression volume. Cylinder Bore Size Piston Stroke Length Head Gasket Bore Diameter Compressed Head Gasket Thickness |
Originally Posted by Clint's C3
(Post 1567714858)
I already have 70 cc heads so I just want to know what the CR is. do you have these values for an L-83:bigears, sorry to copy off of your homework.
Cylinder Bore Size Piston Stroke Length Head Gasket Bore Diameter Compressed Head Gasket Thickness Now if you have 70 cc heads on it, you've obviously replaced them, which means you replaced the head gaskets. So there's no way we can tell you what your head gasket bore diameter or thickness is. You could take a conservative approach and say your gasket diameter is 4.060" and your thickness is 0.041". That should give you the lowest compression ratio you could expect from your motor. To see your max, use a 4.000" diameter and a 0.015" thickness. You probably want stock deck height: 0.025". |
Thanks, stingr69. I have seen other references of 5cc's for L-82 flat tops but no actual detailed specifications. All I could find was,
TRW L2417 Gm Part Number 474190 350 9:1 76cc 336747, 464664 or 464692 71-80 L-82. Piston OD 3.998 to 3.999". But no valve relief info.. |
L2417F is replacement for L82 piston.
My sealed power cat shows these specs for L2417F flattop w/ single trough dome volume: -3.4cc compression distance: 1.560" sealed power (Federal Mogul aka TRW) has a static compression ratio calculator that's quite accurate & handy: http://www.21cgt.com/FMWebCatalog/frmConversion4.aspx btw ... thin steel shim gasket fp1094 volume = 3.2cc x 0.015" thick. gm comp gasket 10105117 volume 5.8cc x 0.028". |
Originally Posted by foxymophandlpapa
(Post 1567715827)
Unless you have had the block worked at all you have the stock 350 specs: 4.000" bore, 3.48" stroke.
Now if you have 70 cc heads on it, you've obviously replaced them, which means you replaced the head gaskets. So there's no way we can tell you what your head gasket bore diameter or thickness is. You could take a conservative approach and say your gasket diameter is 4.060" and your thickness is 0.041". That should give you the lowest compression ratio you could expect from your motor. To see your max, use a 4.000" diameter and a 0.015" thickness. You probably want stock deck height: 0.025". |
Originally Posted by HamadUP
(Post 1567714566)
You can get it yourself using that online calculator :
http://www.csgnetwork.com/compcalc.html That way you can tinker with the best suited head volume/piston compression volume. That is so cool. I'm working on building my 383 -12 cc dish pistons, 64 cc heads. It's cool to see how you can regulate your cr by either changing your head gasket thickness, shaving you block etc. Thanks guys :cheers: Clyde |
All times are GMT -4. The time now is 11:48 AM. |
© 2024 MH Sub I, LLC dba Internet Brands