O.S. Engines 21VZ-B V-Spec
#1
O.S. Engines 21VZ-B V-Spec
Hi! I have this engine.For 25% nitro 12% oil do I need the included extra head shim ? or I need it only for 30% nitro?
#2
don't need it for either. But some like it for 30% but not neccesary
#3
Tech Master
You don't need the extra head shim for 25% or 30%.
#4
Tech Lord
iTrader: (148)
+1 on no extra head shim needed for 30%. I run coldfusion magic. Lend it's 30% & 11% oil in my os speed, same head shims and no problems at all. Add the extra shim to increase top rpm and decrease compression to make the engine have a little less bottom, otherwise run it stock.
#5
Just got a used V-spec in parts, and I wonder about whats the correct shimming for 20-25% nitro.
#7
Thanks. I'm innstaling a new cylinder/piston, con rod and bearings so it vill be god as new