Originally Posted by
Gizmatron
first bigmatt means 0.3mm of shims not 3mm..I run 0.2 on my 7 port with no problems..260-270 is normal but I won't use 30% nitro..I always burn out engines and it really doesn't seem to give me any more power..I use 25% now and mark at massive says he never runs anything more than 20% in his..And you should see the power results he is getting with his new biofuel which technically is only 7% nitro..I am so gutted I don't live anywhere I can get him to post some to...I would drop nitro % and richen the hsn 1/8..the mix tends to get a little lean towards the end of the tank..lower tank pressure and the heat from the exhaust tends to vaporize the fuel too..better to run a fraction rich at the beginning of a tank..
Hey thanks for the reply guy's. I don't know the mm of the shims but it has 1 alum, and 2 copper thin one's on it now. I was asking around this weekend if 30% makes you run hotter than 20% and nobody seemed to know, I'll get a bottle of 20 and try it or mix the 2 and get 25%.
Most times if a motor gets hot the longer you run it the low speed is too rich and the high speed is too lean. (idle gap too wide) Read the tuning bible at the top of the nitro offroad page and it will explain this. There could be other things wrong as in a air leak or head or plug loose.
Rex I went through the eng friday and sealed everthing when I cut the long lsn, definantly tunes easier. I set the idle at 1mm (per tuning bible) but when I started it it was reving quite high, I did unscrew the idle just a tad maybe thats where I screwed up, should I have opened up the lsn to get the idle lower or open hsn? I think I'm close on tune and I love this eng it's just likes to get the attention, kinda like my MG (british car) I used to have.
oh, forgot to say I switched to a p-3 hot a couple weeks ago and that thing sprouted new legs. Been reading the last 100 pages of this link since winter full of info. Thanks