Notices

Broken Piston: WHY?

Old 07-07-2010, 11:45 AM
  #1  
artselectricinc.com
Platinum Member
Thread Starter
 
Steve H's Avatar
 
Join Date: Dec 2000
Location: Longview, WA, USA
Posts: 669
Received 7 Likes on 5 Posts
Default Broken Piston: WHY?

Hi Everyone

I just pulled the port motor because it was low on compression, and had massive blow by. One hole was down to 50psi. I only checked 4 of the easiest holes. Didn't bother withe the rest since the motor was coming out anyway. I have one broken piston and low compression on all cylinders.
This motor was rebuilt by a local builder about 150 hours ago. Stock 415hp 502 with a Merc 502 MPI set up in a 42 Harley that is cruised around 3500 rpm's 99% of the time. Occasional full throttle getting on plane if loaded heavy.
I think it was assembled incorrectly, but I don't know. The starboard engine has over 900 hours on it, and is getting tired, but still runs fine. So I don't think that I am abusing it. I'm sending it out to a different builder this time.

Question: What would cause this?
What questions should I be asking the new builder to ensure that it doesn't happen again?

thanks,

Steve
Attached Thumbnails Broken Piston: WHY?-broken-piston.jpg  

Last edited by Steve H; 07-07-2010 at 11:47 AM.
Steve H is offline  
Old 07-08-2010, 03:54 PM
  #2  
artselectricinc.com
Platinum Member
Thread Starter
 
Steve H's Avatar
 
Join Date: Dec 2000
Location: Longview, WA, USA
Posts: 669
Received 7 Likes on 5 Posts
Default

Ttt
Steve H is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.