Engine "pinch"

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Old 08-18-2004, 03:48 AM
  #16  
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Originally posted by Aaron Waldron
If your engine is tight when it's hot, when it seals very well and will have good compression. "Pinch" is usually what is referred to when the engine is cold, which doesn't mean anything.

eltorito - VSpec or not, an engine has to have compression to run at all, it just might not feel as tight as other motors.

Hi Aaron

Totally agreed with you. Have ran Picco, Hyper, O.S., R.B. &
Nova Rossi engines & once there's no compression you'll never get it to idle or respond instantly.

Is it true from some guy running a CMB .21 off-road engine
that when cold this engine is totally not tight, but when hot
it will be tight. Seen him race & it keeps flaming out after
5 ~ 6 mins run-time.
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Old 08-18-2004, 07:18 AM
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dont know too much about 1/8th scales but the rumor is that those cmb motors are great after u put on a o.s. carb wich one im not sure, i heard this from a guy thats sponsored by c.m.b.
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Old 08-20-2004, 08:19 PM
  #18  
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wow.... My Rustler's Pro.15 has just about NO pinch left... Time for a new motor!
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Old 08-20-2004, 08:34 PM
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Lets say there is a significant decrease in "pinch". what parts would you need to replace?
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Old 08-20-2004, 10:01 PM
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My guess is the Piston, Sleeve, and Con. rod?
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Old 08-20-2004, 10:25 PM
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Originally posted by Aaron Waldron
As far as I know, there isn't a tool to measure the exact compression of an engine this small yet.

An engine that seals well will have good compression.
there is, it works just like a real one, i'll see if i can find a picture of it..,.


$20 at tower hobbies



Illusion-Lighti, you need to replace piston and sleve
LosiFromHell, just do a rebuild
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