Originally Posted by
aspeed
A Turbo plug wouldn't work with a 1/4 - 32 hole in already? That is how mine was. I used the .09 TD plug, and it seemed ok. I forget which one I used for my test, and the difference in rpm. It is too cold to check things now. A burned out TD head could likely be used for the Turbo plug. Is that what you used?
No, the heads which are threaded for a regular plug cannot be converted to a Turbo plug, the hole is too large. A burnt out cox TD09 head could be converted I guess, I haven't taken of the insulator off one to check what they look like "inside".
I have used a dedicated Turbo head (cannot remember where I got if from now...) but the regular TD09 head should also work, might need some shims for a proper compression ratio though. Oddly enough they also put the regular plugs on the TD09 RC engines. Sure you get a nice and low idle but that is because they don't make any power with the regular plugs...
I've put an RJL .09 diesel head on the Queen Bee too, it runs very smooth...
