rcsteve86

iTrader: (15)

I'm looking to get a new jammin' .21 buggy engine. I currently run a hyper 8 port with 30% o'donnel. I added a .1 mm head shim for it to run right. Will I have to shim the jammin' to run on 30%. Would I get better engine life with 20%?

-Steve

FrankBlack

If it didnt come with another shim and it says nothing about it in the manual, id say leave it and see. I use a vspec and i use a extra shim (i use 25/12 AT racing fuel) for better fuel economy. If your only using it on race days 25-30 nitro should be fine, you could drop the nitro content a bit if you intend on using it more, but its hard to say, good engine maintenance and taking care of it will increase your engines life more so than what nitro content you are running.