STD Tuning Engine Piston - to - cylinder clearance dimension

Piston - to - cylinder clearance dimension

Piston - to - cylinder clearance dimension

 
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Jetmugg
GT2256V

125
01-31-2015, 01:16 PM #1
What kind of piston-to-cylinder wall clearance are you guys running in your Mercedes OM60x series engines?

Steve.
Jetmugg
01-31-2015, 01:16 PM #1

What kind of piston-to-cylinder wall clearance are you guys running in your Mercedes OM60x series engines?

Steve.

barrote
Superturbo

1,627
01-31-2015, 03:29 PM #2
well my friend that is milion dólar questionWink my 605 last time i checked was almost 1 mm apart Smile
normal nrs are .25mm as a max.
at www.124zone.com u can find MB repair manual, somewhere in there u have the nrs.
regards

FD,
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barrote
01-31-2015, 03:29 PM #2

well my friend that is milion dólar questionWink my 605 last time i checked was almost 1 mm apart Smile
normal nrs are .25mm as a max.
at www.124zone.com u can find MB repair manual, somewhere in there u have the nrs.
regards


FD,
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[486]
TA 0301

57
01-31-2015, 06:03 PM #3
For piston/wall clearance, .0018"-.0023" per inch of bore diameter is a good safe range. Shoot for the looser end for higher power builds, so the pistons have room to expand as they get hot.
[486]
01-31-2015, 06:03 PM #3

For piston/wall clearance, .0018"-.0023" per inch of bore diameter is a good safe range. Shoot for the looser end for higher power builds, so the pistons have room to expand as they get hot.

F.R.A.S
Holset

579
02-01-2015, 05:25 AM #4
Don't feel like this is Mercedes spec am I right? Source on that?

(01-31-2015, 06:03 PM)[486] For piston/wall clearance, .0018"-.0023" per inch of bore diameter is a good safe range. Shoot for the looser end for higher power builds, so the pistons have room to expand as they get hot.

F-tune Performance [Image: V-band_om606.jpg] [Image: GTX3582R.jpg] [Image: gs6-53dz_gearbox.jpg]

I can help you out with all your manual transmission, clutch, flywheel, intake and exhaust manifold issues.
F.R.A.S
02-01-2015, 05:25 AM #4

Don't feel like this is Mercedes spec am I right? Source on that?

(01-31-2015, 06:03 PM)[486] For piston/wall clearance, .0018"-.0023" per inch of bore diameter is a good safe range. Shoot for the looser end for higher power builds, so the pistons have room to expand as they get hot.


F-tune Performance [Image: V-band_om606.jpg] [Image: GTX3582R.jpg] [Image: gs6-53dz_gearbox.jpg]

I can help you out with all your manual transmission, clutch, flywheel, intake and exhaust manifold issues.

[486]
TA 0301

57
02-01-2015, 07:53 PM #5
(02-01-2015, 05:25 AM)F.R.A.S Don't feel like this is Mercedes spec am I right? Source on that?

(01-31-2015, 06:03 PM)[486] For piston/wall clearance, .0018"-.0023" per inch of bore diameter is a good safe range. Shoot for the looser end for higher power builds, so the pistons have room to expand as they get hot.
Oh right, forgot that that's more toward direct injected engines, they put a lot more heat into their pistons than IDIs. Probably okay to go a bit tighter on an IDI.

Just a general specification found looking around at streetable high performance diesel engines (all direct injected though). The numbers I ran into on dedicated pulling engines were even looser still. Factory is something like .0003" per inch. I'm running something like .0014" per inch on a pretty hot TDI build, but that has oil channels in the piston crown.
[486]
02-01-2015, 07:53 PM #5

(02-01-2015, 05:25 AM)F.R.A.S Don't feel like this is Mercedes spec am I right? Source on that?

(01-31-2015, 06:03 PM)[486] For piston/wall clearance, .0018"-.0023" per inch of bore diameter is a good safe range. Shoot for the looser end for higher power builds, so the pistons have room to expand as they get hot.
Oh right, forgot that that's more toward direct injected engines, they put a lot more heat into their pistons than IDIs. Probably okay to go a bit tighter on an IDI.

Just a general specification found looking around at streetable high performance diesel engines (all direct injected though). The numbers I ran into on dedicated pulling engines were even looser still. Factory is something like .0003" per inch. I'm running something like .0014" per inch on a pretty hot TDI build, but that has oil channels in the piston crown.

 
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