Page 1 of 1
How long to run-in a 503.
Posted: Mon Jul 02, 2007 11:10 pm
by nickjaxe
Hi guys I have re-built my 503 with new oversized pistons/cylinders and ground run it for 1 hour as per the rotax instructions,
Just wondering when could I consider that the engine is fully bedded
in to be able to carry out an accurate compression test.
Nick.
Posted: Tue Jul 03, 2007 8:55 pm
by Duck Rogers
Nick.....about an hour will do.
Check page 63 of the Rotax Installation Manual for the 503. If you don't have the manual, download it from here:
http://www.ultralightnews.ca/rotax503/r ... manual.pdf
Posted: Wed Jul 04, 2007 5:34 pm
by KFA
There is a difference between being run in and properly bedded. I would say arround 25-50 hr's for a two stroke and arround 75-100 hours for a four stroke. Just my oppinion.
Posted: Wed Jul 04, 2007 6:21 pm
by nickjaxe
Hi duck yes thats what I used to cover the 1 hour ground run,
but I was wondering how long does it take for the rings to fully bed in,
did a compression test after the 1 hour ground run and got 100psi cold both pots.
Nick.
Posted: Thu Jul 05, 2007 6:21 am
by Duck Rogers
KFA wrote:There is a difference between being run in and properly bedded. I would say arround 25-50 hr's for a two stroke and arround 75-100 hours for a four stroke. Just my oppinion.
You're right. I didn't read the question properly
Posted: Thu Jul 05, 2007 9:44 am
by Quentin Ferreira
3 to 4 hours......Dont try and do long trips and not open throttle for a long time ....
The best way is to do a couple of circuits where you have dif throttle settings
Quentin Ferreira
ZU-ATP
Newcastle
Posted: Thu Jul 05, 2007 10:44 pm
by nickjaxe
Thanks guys, just tried a better comp tester I now get 125psi cold,
My other tester had a sticky valve.
Nick.