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Engine running then turning off, won't start

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Old 05-03-2003, 12:42 AM
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JCJR
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Default Engine running then turning off, won't start

Just bought a T-Maxx on E-bay and had problems with engine. I've had experience with nitro engines but was baffled with this one.

OS .15cv-x , pullstart. Engine ran for 5 minutes and turned off when applied the brake. Couldn't start till it cooled off. Engine had to be heated at start of day to make it easier to start.

Checked all the posts and couple people had same problem but no real solution.

Two possible solutions replace sleeve/piston or had air leak.

This is what I learned, please feel free to post your comments.

I thought that I had plenty of compression due to engine having to be warm to start this is true, but what was happening was engine was overheating causing fuel in line to boil, and bubbles shut engine off. Overheating caused by air leaking into sleeve/piston. This caused metal to expand and loss of compression, resulting in waiting to cool to restart. Also idling was erratic. I sent my sleeve to OSrocket on ebay and he returned P/S with more compression.

Installed and idling much better but now overheating was with in 2 minutes and all of the above, except I can start the engine right away. Did not have to wait to cool. After checking engine for leaks ie, carb, backplate , o-rings. Asked lhs if they had head gasket kit. They said no and asked how many shims I was using. I said none and he said I could have too much compression causing engine to overheat. Did not have shims but used a .12 cooling head which has more room (hence less compression). Now engine runs at 225 deg with same settings. Can you believe that. I'm still stunned by this, but it is working fine now.

So, first I had a P/S problem which was caused by overheating due to too much compression.
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Old 05-03-2003, 03:28 AM
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Default Engine running then turning off, won't start

Dude..

You said too much there..
I'm really confused.

Pleas sort out all you've said chronologically and step by step.. IT'd take me a whole page to say what you did in those 2 paragraphs lol
ram
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Old 05-03-2003, 06:22 AM
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Default Engine running then turning off, won't start

the way i see it the poblem was solved..right man?
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Old 05-03-2003, 01:08 PM
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JCJR
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Default Engine running then turning off, won't start

Trying to help others who have had engine flame out.

Happened twice to me. Once when had P/S issue and again when it was fixed. Difference between both was when the P/S was bad the engine had to cool off to restart, this is because of the expnd sleeve creating more air gap. And also that too much compression can over heat an engeine.
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Old 05-03-2003, 06:30 PM
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Default Engine running then turning off, won't start

Thanks for the info. Wonder if I'm having the fuel-line boiling problem.
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