Box Stock

Both rtc 6 and rtc 9 heads

Yakattack said:
Yes... RTC6 .090 milled... 15cc
Click to expand...
With a 15 CC head, a .010" gasket and the piston .005" in the hole, my spreadsheet calculates your compression ratio at 12.98 to one. That's getting pretty close to race gas compression, if not right at.

Not enough octane with the fuel you're running, no problem, just run it richer. Of course you won't get the performance you would get with the right octane fuel, which you could run leaner, but you could get by with it.

This is where the EGT (Exhaust Gas Temperature) comes in real handy, the higher you can get the EGT, the more power you're making. If your fuel octane is not high enough for your engine, and you end up running richer to get the best performance, if you had higher octane fuel, you could run leaner and make more power.
 
alvin l nunley said:
With a 15 CC head, a .010" gasket and the piston .005" in the hole, my spreadsheet calculates your compression ratio at 12.98 to one. That's getting pretty close to race gas compression, if not right at.

Not enough octane with the fuel you're running, no problem, just run it richer. Of course you won't get the performance you would get with the right octane fuel, which you could run leaner, but you could get by with it.

This is where the EGT (Exhaust Gas Temperature) comes in real handy, the higher you can get the EGT, the more power you're making. If your fuel octane is not high enough for your engine, and you end up running richer to get the best performance, if you had higher octane fuel, you could run leaner and make more power.
Click to expand...

There is a tresshold with egt , go to lean and it actually goes down
 
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