weird engine noise, piston slap? (video)
#1
weird engine noise, piston slap? (video)
Here is a video of my engine, it's making a weird noise.
http://www.youtube.com/watch?v=-XYrQNv6pKk
i thought it could be the mivec, i switch that to ON and the sound stays the same.
It's mostly when it's cold, and i didn't make that sound when i first built the engine.
The pistons have anti-scuff coatings, i'm wondering if they have worn off.
piston to wall clearance is 3.5thou
The sound only ever happens when there is combustions, i.e. if you rev up it will make the click/tick, but then as the engine drops back down it doesn't make the sound.
This rules out lifters.
I did a cold compression test, and came up with 161, 158, 162, 162. I will post up Hot compression results when i do them.
Any other ideas?
http://www.youtube.com/watch?v=-XYrQNv6pKk
i thought it could be the mivec, i switch that to ON and the sound stays the same.
It's mostly when it's cold, and i didn't make that sound when i first built the engine.
The pistons have anti-scuff coatings, i'm wondering if they have worn off.
piston to wall clearance is 3.5thou
The sound only ever happens when there is combustions, i.e. if you rev up it will make the click/tick, but then as the engine drops back down it doesn't make the sound.
This rules out lifters.
I did a cold compression test, and came up with 161, 158, 162, 162. I will post up Hot compression results when i do them.
Any other ideas?
Last edited by RSMike; Mar 28, 2011 at 04:04 PM.
#7
thanks for the reply.
Was the noise you heard only on "combustion" ? i.e. didn't happen when you had the Throttle body closed?
I'm running stock Evo9 seats, retainers and GSC Beehive springs with S1 mivec cams.
As you can see, the "click" can clearly be heard at idle once the engine RPM has decreased from being Revved.
Cheers, Mike
Was the noise you heard only on "combustion" ? i.e. didn't happen when you had the Throttle body closed?
I'm running stock Evo9 seats, retainers and GSC Beehive springs with S1 mivec cams.
As you can see, the "click" can clearly be heard at idle once the engine RPM has decreased from being Revved.
Cheers, Mike