OS 91 PS Shims With Different Types Of Fuel

[wattybotts]

Hey Everyone,

If I were to use different sorts of fuel, besides Cool Power (maybe Powermaster, Magnum, Wildcat, etc) would I have to change any shims on my head?

Thanks
Bobby

[DavidH]

If you have the Viperhead on the engine. Your definitely going to have to add more shims if you switch to Magnum from Cool Power or Powermaster.

Don't know how fuel changing affects the engine with the stock blue head.

You may have to add additional shims if you use Magnum with the stock head.

I am not saying Magnum is a bad fuel, it is just something that was found when testing the Viperhead. The head had to be shimmed an additional .008 than was used with other fuels.

David

[Clintstone]

24 thou with Viperhead on Mag..........................12-16 thou with CP on Viperhead. I am currently running 16 on my BIG BORE OMI CARB these are numbers for OS C-Specs

[RPM 1.5]

YOU CAN"T BE STILL FIDDLE FARTNG WITH THAT ENGINE?????????????????????????
Man my back would hurt as much as you bend over and #$$#%^%$^&$%^&^& with those needles HE HE HE HE HE HE !!!!!!!!!!!!!!!!!!!!!!!!!!! :arggg: :arggg: :noteworthy :noteworthy :WOW :twisted:

1 1/2 and left handed
Ray :D

[wattybotts]

LMAO Ray--- you are too funny.

Ok... I am running the stock head. How bout powermaster. Any shims need to be changed? (for those of you who run PM)

Thanks
Bobby

[DavidH]

Powermaster will run the same as Cool Power. I have seen pilots that were running Cool Power 30% Heli and put in Powermaster 30% Heli and never touch anything. Those fuels seem to be similar.

David