Hey guys,
I have a buddy who will be getting a nitro vehicle secondhand for free from his inlaws.His bro-inlaw had it for a year then was sent to Iraq.They want to give it to my buddy.My question is this,provided we can get it running,how much pinch should the motor have right after a tank when it is hot?Should it roll fairly easy being that it is hot?If you go to bdc after a run?
I am not sure and neither is he if it is a off road or onroad vehicle yet,i am sure that makes no differece though.A motor is a motor right?
Anyway,Thanks for taking the time to read and answer this ?,
Mike

P.S. I am wondering this because i want to know if the motor is in good shape or not.I am not much of a mechanic so taking it apart and checking it out is beyond my skills.So far. [>:]

First off... a broken in engine has no pinch, it has compression...or lack thereof if it is used up.

The only accurate ways of determining the state of the engine would be a compression check,leakdown test, or good ol fashioned thrash on it and see if you can get her tuned.

Compression checks/leakdown tests should only be done when the engine is cold.

Yes,i undertand that it is best to check the compression while motor is cold.I guess i just thought that maybe you could get a better idea of how worn the tolerance is while hot.Guess i am wrong.as usual.lol.

ENGINE

if the engine is rooted it will have a very broad tuning range,meaning that the needles dont react as they should so one full turn either way wont make a difference.also when it is hot you wont be able to tune it

The quickest way to check for compression is to remove the engine then hold it by the flywheel. Let the engine fall until it's pinch zone holds it from continuing to fall. Once this happens count to ten. If it can hold its self for over 10 seconds it still has good compression. Even if it does have good compression though it still may not run properly. The only way to find that out is to run it, and see.