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Old 08-15-2010, 02:12 PM   #1
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Default Nitro Engine Replacement

I was wondering how i know when i need to replace my engine. What signs will i get from my older one to indicate a replacement is needed?
Also how often should i do this?
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Old 08-15-2010, 02:38 PM   #2
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Loss of bottom, inability to idle right and flameouts when at running temp.
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Old 08-15-2010, 02:41 PM   #3
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New engine for every gallon of fuel you consume.
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Old 08-15-2010, 02:46 PM   #4
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New engine for every gallon of fuel you consume.
This is a joke right........ A good motor will last 6 to 8 gallons. Then your option to buy a new one or re-pinch and rebuild the one you have.
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Old 08-15-2010, 03:01 PM   #5
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Loss of bottom, inability to idle right and flameouts when at running temp.
runs great until it warms up

neobart is spot on
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Old 08-15-2010, 04:47 PM   #6
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This is a joke right........ A good motor will last 6 to 8 gallons. Then your option to buy a new one or re-pinch and rebuild the one you have.

i noticed the repinch and rebuild. could you explain?
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Old 08-15-2010, 05:46 PM   #7
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New engine for every gallon of fuel you consume.
if this isnt a joke thats alot of money wasted, or your arent tuning right
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Old 08-15-2010, 06:51 PM   #8
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i noticed the repinch and rebuild. could you explain?
repinch is when the sleeve is resized with a special tool that allows the piston to have compression again to the sleeve. After the engine gets tired people will normally repinch it and it runs like new again.
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Old 08-15-2010, 06:54 PM   #9
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New engine for every gallon of fuel you consume.
Yea if its a TRX 3.3 But if not and ur serious you must buy used, have tunning way off, and dont break in the engine. Most engine dont even pass break in until after a gallon how do u figure they only last that long, i know a guy with 12+ gallons on a o.s. speed and a normal race engine will last around 6 to 9 gallons.
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Old 08-15-2010, 07:16 PM   #10
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repinch is when the sleeve is resized with a special tool that allows the piston to have compression again to the sleeve. After the engine gets tired people will normally repinch it and it runs like new again.

so its basically like a new engine?
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Old 08-15-2010, 07:27 PM   #11
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so its basically like a new engine?
Yep. It should run just like new. I am pretty sure you would still have to break it in again. And if you didn't want to get it pinched for some reason, there is always the option of replacing just the piston and sleeve. It is still ALOT less expensive than getting a whole new motor. I replaced the piston and sleeve in mine at the beginning of this year.
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Old 08-15-2010, 07:42 PM   #12
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Yep. It should run just like new. I am pretty sure you would still have to break it in again. And if you didn't want to get it pinched for some reason, there is always the option of replacing just the piston and sleeve. It is still ALOT less expensive than getting a whole new motor. I replaced the piston and sleeve in mine at the beginning of this year.
yeah just like new again, I hear you dont have to go into breakin as far as you do with it new new but I hear you just need to do a cuple tanks like break in but not as much.
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Old 08-15-2010, 07:48 PM   #13
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yeah just like new again, I hear you dont have to go into breakin as far as you do with it new new but I hear you just need to do a cuple tanks like break in but not as much.
depends on what kind of pinch you get, a light or medium pinch will only be 2-4 tanks like break in but a tight pinch will be a full blown break in, but 99% of people dont do a tight pinch bc it is extremely rough on the rod and crank. i had an engine pinched and IMO its better than new
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Old 08-15-2010, 08:08 PM   #14
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depends on what kind of pinch you get, a light or medium pinch will only be 2-4 tanks like break in but a tight pinch will be a full blown break in, but 99% of people dont do a tight pinch bc it is extremely rough on the rod and crank. i had an engine pinched and IMO its better than new
yeah makes sence i wouldnt want to put a used ron under the pressure of a new sleeve because it wont last, im thinking of gettin my grp a pinch sometime soon u know any guys u really liked?
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Old 08-15-2010, 08:10 PM   #15
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yeah makes sence i wouldnt want to put a used ron under the pressure of a new sleeve because it wont last, im thinking of gettin my grp a pinch sometime soon u know any guys u really liked?
Alan Burton he does good work and you can get new bearing and all from him pretty cheap, and he cleans the engine alot too, its like new again. he is on here somewhere, just PM him and he will give you all the info you need.
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