REAL QUICKIE
#8
Tech Elite
iTrader: (28)
I run 30% in my .12's but I check the shimming first. I think out of 2 novas, 1 cv-r, and a peak engine they were all ok except the cv-r which I added one shim to.
As far as a power difference it doesn't seem to change that much that I noticed. Just have to tune the engine how you want it to run like normal.
If you're worried about the engine just run it once and make sure you tune it nicely. When you are done running it take the head off. If the head button and piston top look like they have been sand blasted a bit then you need another shim. Or you can take a piece of solder and bend an 1/8" L on the end of it. Put it down the glow plug hole so it runs in line with the crankshaft, then rotate the piston one full revolution with the flywheel so the piston pinches the solder. Then pull the solder out and measure it with calipers. Add shims until it's .030" or just a bit under.
As far as a power difference it doesn't seem to change that much that I noticed. Just have to tune the engine how you want it to run like normal.
If you're worried about the engine just run it once and make sure you tune it nicely. When you are done running it take the head off. If the head button and piston top look like they have been sand blasted a bit then you need another shim. Or you can take a piece of solder and bend an 1/8" L on the end of it. Put it down the glow plug hole so it runs in line with the crankshaft, then rotate the piston one full revolution with the flywheel so the piston pinches the solder. Then pull the solder out and measure it with calipers. Add shims until it's .030" or just a bit under.
#9
It should be fine. I run 30 in my .12's. I also ran it in my O.S 18tm