RCU Forums - OS 30VG Compression ?

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- - OS 30VG Compression ? (https://www.rcuniverse.com/forum/o-s-engines-support-133/5744879-os-30vg-compression.html)

Shark413

04-20-2007 12:33 PM

OS 30VG Compression ?

I recently bought a new OS 30VG and I noticed that even when new I could turn the motor over by hand using the flywheel (with some difficulty). After a about 1/2 gallon thru I can easily turn the motor over by hand, there is still some resistance when turning it over and the engine runs fine. Is this a characteristic of the ABL type engine? I also have a OS .21 VZB V-Spec which is an ABC engine and even after a gallon of fuel thru it I cannot turn the engine over by hand. I am currently using Trinity Monster 30% nitro with 12% oil.

l3asher

04-20-2007 06:11 PM

RE: OS 30VG Compression ?

Quote:

ORIGINAL: Shark413

I recently bought a new OS 30VG and I noticed that even when new I could turn the motor over by hand using the flywheel (with some difficulty). After a about 1/2 gallon thru I can easily turn the motor over by hand, there is still some resistance when turning it over and the engine runs fine. Is this a characteristic of the ABL type engine? I also have a OS .21 VZB V-Spec which is an ABC engine and even after a gallon of fuel thru it I cannot turn the engine over by hand. I am currently using Trinity Monster 30% nitro with 12% oil.

Me too, I just got mine back from warranty and they sent me a brand new engine. I did notice that I can turn it over by hand pretty easily.

Shark413

04-21-2007 06:08 PM

RE: OS 30VG Compression ?

So is that normal (to be able to turn over a new engine by hand)?

Bax	05-01-2007 01:18 PM

RE: OS 30VG Compression ?

Different engines have different specs. The .30 VG is more of a "sport" engine than racing, so will be a bit looser in the piston/cylinder fit.

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