I'm in the early stages of testing a smoke system on a 2.4 Brison on a Sig Extra. I was running an on-the-ground test today which resulted in a question or two.

I've got a Perry pump running off the crankcase. When the engine idled, it seemed like the smoke was good and white, but when I revved the rpms, the smoke seemed to thin a lot. I've adjusted the amount of the smoke oil with the needle valve and that helped a little, but at high rpms it didn't EVER get as nice and white as it did at idle.

Ideas? Is is possible that at high rpms the crankcase pulse becomes more like a constant pressure and the pump doesn't oscillate like it does at idle - just a thought. I'll keep testing.

Thanks!