Proper Break-In for a motor
06-20-2003, 02:30 PM
#1
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Join Date: May 2003
Posts: 1,090
Proper Break-In for a motor
What is the best and proper way to break in a brand new motor and get the rings seated etc?
Also what kind of oil should I be using and when to change it during this breakin, and when can i switch to synthetic?
Thansk a bunch!
Also what kind of oil should I be using and when to change it during this breakin, and when can i switch to synthetic?
Thansk a bunch!
06-20-2003, 06:34 PM
#2
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Join Date: Apr 2002
Posts: 908
At my uncle's shop, we usually start the engine and let it warm up to operating temps (about 5-10 min or until the smoking about stops). During this time we check for leaks, odd noises, and error codes in newer cars. Then we take it out on the road if everything is fine. In a 1:1 ratio gear, gently accelerate and decelerate between 1500 and 2200 rpm for a few minutes.
The idea behind this is to let the rings "cut out" the rough edges between them and the cylinder walls during the idleing period, and gently loading them on the road to get them seated over the whole ring surface (especially at the edges since rings will flex a little under load). But you keep the rpms down to keep from cutting too much. Works great.
Here's just a general way we break-in the engine:
After seating, keep the rpms under 2500 for the first 500 or so miles. Then you can get a little more aggressive and take it up to 3500 or so every now-and-then (under moderate thr.) for another 500 miles. After about 2500-3000 total miles of non-WOT, "regular" driving, the engine should be as broken in as you can get. Then romp on it at will.
Use regular dyno oil for the first 4 or 5K miles then switch to synthetic if you like.
The idea behind this is to let the rings "cut out" the rough edges between them and the cylinder walls during the idleing period, and gently loading them on the road to get them seated over the whole ring surface (especially at the edges since rings will flex a little under load). But you keep the rpms down to keep from cutting too much. Works great.
Here's just a general way we break-in the engine:
After seating, keep the rpms under 2500 for the first 500 or so miles. Then you can get a little more aggressive and take it up to 3500 or so every now-and-then (under moderate thr.) for another 500 miles. After about 2500-3000 total miles of non-WOT, "regular" driving, the engine should be as broken in as you can get. Then romp on it at will.
Use regular dyno oil for the first 4 or 5K miles then switch to synthetic if you like.
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