Originally Posted by
Xontroi
So dear Blis if i understand right you believe that i will go hot with N21-7T.
I had the hope that two slices of aluminium couldn't give such a big difference
Of course i haven't mind to run the engine richer in order not to get hot.
I want a well performed engine and not intermediate solutions.
I run Byron Race Gen2 25% nitro 11% oil.
I read a lot also at igtforum and some the guys there run some on road engines on GT2.
They didn't mentioned something about temperatures. On the other hand no one told that they were cool.
My last question was what if i replaced the head with another one from rally or from of road engine, as Roelof said.
The 4 holes at the head are the same at some Nova motors. I mean the pattern-distances of the holes.
My point is that a rally car is like a nitro drifter, the engine is revving but there's no air passing across the heat sink. A can am on-road car has it's heat sink totally exposed all the time and it has a lot of air passing.
Im not an engine guru by any means of the imagination but this is simple common sense. And for any air cooled engine that is wheel spinning you will need to use the Methanol in the fuel to cool it down.
But please consider, that a good quality NovaRossi will be a lot more reliable! Regardless it's how you tune it for the conditions and if you wish to look in the Off-Road Engine thread there is a very strong discussion regarding fuels. No one fuel is perfect for all conditions and I believe this is a critieria you should factor into your decision process. Gearing will also play a major part in the strategy, once again completely dependent on the track.
Yes I've strayed from the original post of "which engine" but lets not discount the application of the engine which should have a strong bearing on the decision.