Loud knock and severe piston galling after 500 miles on rebuilt motor

Reply Subscribe

Thread Tools

Search this Thread

Oct 24, 2023 | 09:13 AM

#31

downzero

Stellar HDF Member

Joined: Mar 2008

Posts: 2,328

Likes: 2,205

I'd like to know the piston to wall clearance and what the spec is for that piston.

Oct 24, 2023 | 11:31 AM

#32

tdrglide

Road Captain

Joined: Mar 2020

Posts: 654

Likes: 355

From: Sierra foothills

Quote:

Originally Posted by memphisharley

old thread with good stuff..

Doh

Oct 24, 2023 | 05:01 PM

#33

djl

HDF Community Team

Joined: Jun 2006

Posts: 12,773

Likes: 2,603

From: san antonio

Quote:

Originally Posted by downzero

I'd like to know the piston to wall clearance and what the spec is for that piston.

Those clearances will vary from cast to forged and vendor to vendor. Search "piston to cylinder" clearance and you will get more information on the subject than you want.

Oct 26, 2023 | 12:58 PM

#34

propflux01

Road Warrior

Joined: May 2007

Posts: 1,433

Likes: 383

From: Arkansastan

Yes, old thread but interesting nonetheless. Looking at that dyno sheet I wouldn’t think it would run that well with that big dip in the lower end. Maybe that tune helped with the engine demise. I wonder what the final outcome was.

Oct 26, 2023 | 01:33 PM

#35

TwiZted Biker

Club Member

Joined: Mar 2009

Posts: 66,106

Likes: 51,387

From: Niles Canyon Ca.

Old thread but classic issue, 27 miles on a new motor and slapped on a dyno and the owner wonders why it **** itself.

Oct 26, 2023 | 07:37 PM

#36

60Gunner

Grand HDF Member

Joined: Sep 2017

Posts: 4,359

Likes: 1,219

From: Dubuque, IA

Quote:

Originally Posted by TwiZted Biker

Old thread but classic issue, 27 miles on a new motor and slapped on a dyno and the owner wonders why it **** itself.

What does this have to do with anything? Mine was "slapped on the dyno" with 0 miles.

Oct 26, 2023 | 07:40 PM

#37

gonemad

Seasoned HDF Member

Joined: Sep 2020

Posts: 8,134

Likes: 9,532

From: central NC

Quote:

Originally Posted by 60Gunner

What does this have to do with anything? Mine was "slapped on the dyno" with 0 miles.

Two words.

Break

In

Oct 26, 2023 | 07:40 PM

#38

TwiZted Biker

Club Member

Joined: Mar 2009

Posts: 66,106

Likes: 51,387

From: Niles Canyon Ca.

Quote:

Originally Posted by 60Gunner

What does this have to do with anything? Mine was "slapped on the dyno" with 0 miles.

Motor life is directly tied to break in or lack of when **** goes sideways as many an engine has done, been in this game far to long to believe otherwise. You have your beliefs and I have mine and we'll leave it at that.