The short answer is to get in touch with Performance Specialties to place an order for props, plugs, a spare head, spare needle, etc....and ask Dave to steer you in the right direction.
In general, use the least amount of nitro, compression and propeller load that gives you what you want.
The HD Nelson head is wound with heavier wire than the standard.
If you aren't starting out your testing under compressed, under propped and with minimal nitro...then there's no point in talking about what it takes to find the correct combo on your own [with out having Dave around].
Guys with model diesel engine experience must learn this basic set of rules and high performance glow engines follow the same rules if you want any sort of longevity and repeatable success.
Last edited by combatpigg; 03-23-2015 at 05:02 PM.