ORIGINAL: ggeezer
I was very careful with the break in. I started with fuel blended for Fox engines (5% Nitro and 29% all Castor) for the first 30 minutes.
I am now using 10% Nitro and 22% all Castor. The engine is still not broken in as the rpm keeps increasing on each run. I'm sure I will hit 17,000. My plan is to slowly enlarge the ventury and increase the Nitro to see how much I can get out of her without needing pressure.
Orv.
After reading Orv's procedure, I looked up the online instructions (which Orv is following correctly). Is the Wasp not an ABN setup?
The online procedure appears to follow the old iron/steel process used to heat cycle an iron piston. If I understand correctly, a high silicon aluminum piston does not heat cycle. My understanding is that after the first couple of minutes to wear-in the conrod bearings (and possibly remove residual manufacturing junk), the rest is just slightly rich run time to smoothe crankshaft and piston/cylinder fits.
Is there something different about the Wasp metalurgy?
I don't have a Wasp, but I have some NORVELs (both ABN and Revlite).
George