FI Engine Break In?
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Launching!
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Joined: Feb 2005
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From: Chesapeake, Virginia
FI Engine Break In? I am currently in the process of rebuilding my engine, new pistons, cam, everything. How long should I break in the engine before I hook the blower back up? Also the cam I am putting in requires computer modifications, how much will this affect breaking in the motor? Thanks
I understand that you would want to break the motor in to let the rings seal, but what if you only swap a cam? Can you break the cam in with FI enabled? I don't see why not but I just wanted to make sure.
thanx
thanx
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SSU'S Vice Mod
Joined: Jul 2004
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From: Hazard Co. Maryland
Originally Posted by mdhmi
I've seen some tuners (top rated) post that the rings settle within a few few minutes and other say you want a 500 mile break in.
Mark
Mark
I think most of that has to do with how the rings are timed and how the cylinder walls are finished. Not that I'm an engine builder or anything, but just from what I've read. Hell, I think some of the top level race teams don't even do more than turn the motors over on the dyno a little bit to make sure it runs ok, if anything. Then again, they have bigger budgets than us average joes.
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15 minutes of idle + oil change, then hit the dyno. 10K miles later I'm at 1% or less leakdown in every cylinder at no less than 650 RWHP the entire time, total seal gapless rings. Last motor I built was my old notch with an S-trim on a mild 302 rebuild, after 10K miles at a bit over 400 RWHP it was seeing 4-5% leakdown across the board and lower compression numbers. I'm always going to break in motors on the dyno now.
SSU'S Vice Mod
Joined: Jul 2004
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From: Hazard Co. Maryland
Originally Posted by eviltwins
15 minutes of idle + oil change, then hit the dyno. 10K miles later I'm at 1% or less leakdown in every cylinder at no less than 650 RWHP the entire time, total seal gapless rings. Last motor I built was my old notch with an S-trim on a mild 302 rebuild, after 10K miles at a bit over 400 RWHP it was seeing 4-5% leakdown across the board and lower compression numbers. I'm always going to break in motors on the dyno now.
Was this on the engine dyno? Or was it in the car on the rollers?? What kind of work did you do on the dyno? Did you put it through various cycles, like a pull from 2k-4k, then 2300-4500, 3k-5k, ect, or something like that? Gapless rings are good stuff. Definately a piece that is worth it in any motor. Question is, are they making gapless rings for Gen III SBs yet? I don't know, I've never researched that question, though I'd have a hard time believing they didn't.
