ORIGINAL: atul123
My question is: How much OIL percentage do you use with Zero nitro?
You need to use a higher % of oil because without any nitro the fuel consumption is quite a bit less. As a rough guide, without nitro we're getting about 8 minutes per tank compared to about 6 minutes with 25% nitro. We use 20% all castor so that's about the same flow rate of oil as using 16% oil in the nitro mix. Castor is used for two reasons, first it's a far better oil especially for the conrod and second, we get it cheaper than synthetics
.
Edfltchr
Unless the shim is unusually thick it probably won't make a noticeable difference. Usually a head will still seal without a shim but sometimes they need a bit of lapping to smooth out any machining marks. Toothpaste (not the gel kind
) makes a very fine lapping compound.