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04-18-2004 | 11:14 PM

#8397

Brett.w

Tech Addict

Joined: Apr 2004

Posts: 590

From: Auckland,New Zealand

Re: Re: max engine

Quote:

Originally posted by InitialD
Open up the engine and check the top of the piston or the button head to see that it's surface is not sandblasted.

You could also look at the condition of the plug. Look at the plug coil to see if the coil is distorted. If it is and you're blowing plugs every now and then, it could be that your engine has too much compression. Look in depth engine tuning tips, look no further than Dennis Richey's site.

Proceed to tune your engine from rich to lean.

Try to pinch the fuel line going into the carb as close as possible. Your engine should not die immediately. If it does, then too lean. If it takes a long time to die, then you're too rich.

When the engine is cold, can you turn the flywheel easily or do you still feel the resistance?

Hey thanks for the info D but i think i have my worst fears confirmed after removing the head the top of the piston is very black and rough the bottom of the glow plug the filament seems to have melted to the bottom of the plug! is this a dead engine?
I'll cut and paste a posting I did on the NovaMax engine thread;

If I need to tune the engine to race, what I do is best to set the LSN to 4 turns out and HSN to 6 turns out. I do this on most engines. Idle screw is set such that the slide carb is having about 1 mm hole opening when closed. You need to keep throttling to keep the engine running. Set the LSN to lean it till the engine idle RPM goes up a little and then back out a little till the idle remains constant. That should be the ball park LSN setting. Now tune the HSN till you get the engine revving to the highest RPM very easily. Then back out / richen the HSN a little. Test it on track to fine tune.

If the idle is dropping, lean the LSN a little bit more. Hope that helps.

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