What is better to break in a motor,a break in bench or in the car?

if your doing high volume and need less hassle then a breakin bench, in the car is much better and quicker though.

I normally get about 80% done on the bench and then tranfer the engine to the car for last two tanks.

The bench is alot easyer. And I can run it anytime I want.

but, say using the murnan method, breaking in the car, will be fsater? as stated above? i would think the stand would put less strss on conrod producing logevity of parts, but if in car hampers a FASTER motor, in the car it is!!

I use the bench. I heat the engine with a heat gun to 220deg, fire it up and run it a 1/4 to 1/2 throttle for a full 1/2 gallon with out stopping at 220deg (i made a custom 1/2 gallon fuel cell). This establishes a perfect piston sleeve match. Then I put it in the car and start to lean it out and run it. I have never had engines "come to life" as much as they do with other methods compared to this method.

The run-in methode can not say how the engine will be. Most populair methodes are based on the same principle: rich and full throttle. Because the tolerances no engine is the same and results the same with the same run-in methode.

Just use what you think is the best and you will be satisfied.

Don't you want to heat cycle it at all in between tanks?
I just read this and it sounds dangerous haha, but is it okay for the piston/sleeve/conrod/wristpin?
I read L. Collari uses this method..........but ya' know...engines to these top drivers are a penny a bag.

http://www.cefx.net/tips/nitro/break-in/index.php

dead thread but anyway

no use for an air filter on the Hudy Break-in Bench? From the looks of the bench it doesn't look like it will fit an air filter at all... where's the safety from debris small particles?

i did 1/4 of a gallon on a breakin bench, 3 tanks on track,with 1/5-1/4 turn down on HSN each tank

I snag a pair of the old lady's stockings. Cut a small portion then place it over the carb intake. Use a rubber band to secure it. douche it with a little air filter oil. Not the best but it's the only thing I have found that fits.

Pass you soon...

this is interesting i wonder if this method can be use as safety precaution during play time

I would not use this for normal running. I only use this while using a break-in bench