VT 49 stalling

HP engines (Hirtenberger, AG Austria) tech support. Owned by RJL Industries since 1990

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VT 49 stalling

Postby JSRagman » Tue Nov 08, 2005 10:29 am

I have a VT 49 that runs great untill you add angle of attack at which time it dies. I have tried different fuel, glow plugs, checking carb sealing, etc. I have checked the carb for fish mouth in the needle seat with only improvement in idle preforance. Any other ideas would be great.
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Postby MECOA » Sat Nov 12, 2005 6:38 pm

Do you have the pressure lines hooked up correctly?

it shows it here
http://www.mecoa.com/hp/vt/guide.htm

You have to have 20% oil in the fuel.

If the wrong plug was ever installed in the engine it could have ruined the valve. No r/c idle bar or 4 stroke plugs.

Just standard long plugs. Look in the plug hole for any sign of the plug hitting the valve sleeve.
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Postby JSRagman » Wed Nov 16, 2005 7:28 am

Yes, I followed the instructions for break in and even had others in my flying club double check. The main problems is I can not get the engine to run if i raise the engine up from normal horizontal postition. I can get more angle of attach if enrichen the engine. About 5 turn out from peak I can get about 45 degrees up from horizontal before it dies.

I am use fuels with at least 20% caster and also the correct length plugs.
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Postby MECOA » Wed Nov 16, 2005 7:25 pm

If the valve is worn it will do this. How far from the back of the engine is the front of the tank?
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Postby JSRagman » Thu Nov 17, 2005 2:51 pm

Within inches of the back of the engine. This has been happening since new.
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Postby MECOA » Tue Nov 22, 2005 9:20 pm

Is this an Austrian or US made engine?

You may want to check the valve timing
http://www.mecoa.com/faq/vt/timing.htm

also if you run too big a prop you may have this problem. Try it with a 11x5 prop.
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