I have seem papers, published by SAE, from Yamaha, documenting the difference between air cooled and water cooled 2 cycle engines. It's substantial.I'm on an inertia dyno . When I start at 150 degrees , make 3 pulls back to back, power goes down as temp increases. Heat soak, lash increase, valve train instability, increase deck height? Where is the power lose coming from?
How much power are you looseing when the engine is at 350 degrees.
Check your A/F Ratio - I'd be willing to bet it dropped on pull 2 and 3......I'm on an inertia dyno . When I start at 150 degrees , make 3 pulls back to back, power goes down as temp increases. Heat soak, lash increase, valve train instability, increase deck height? Where is the power lose coming from?
Yes, Aluminum expands much more rapidly than steel! The head and block grow real quick and the steel pushrods and valves grow much slower.Just so I understand!!! Most times when I heat metals, they expand, get bigger. So this is a deal where maybe the pedestal is rising as heated or something similar to that. Does aluminum expand more than steel? I dont have a dyno at this point, but I trust that you guys are telling the truth. Just trying to understand WHY.
Aluminum expands more than steel. The speed of expansion is not a factor.Yes, Aluminum expands much more rapidly than steel! The head and block grow real quick and the steel pushrods and valves grow much slower.
Interesting care to elaborate a bit? Valve grinding compound possibly?Thats it right there ... Dons on it. I like to break mine in before assembly a bit.
TIP: Look up Jody Powell from ARC racing on YouTube... he shows this trick along with many other awesome tips and tricks!Interesting care to elaborate a bit? Valve grinding compound possibly?
Where is the power lose coming from?