Repair combustion chamber and piston top

Old 07-19-2011, 09:25 AM
  #1  
robinh
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Mar 2008
Posts: 3
Default Repair combustion chamber and piston top

I had a foreign object (carb vent tube) fall into the engine and enter two cylinders. The damage is confined to dings on the top of the piston (forged) and head combustion chamber (aluminum). My question is can the dings be ground and polished down? If so, what would be the recommended procedure and tools? Thank you.
robinh is offline  
Old 07-19-2011, 09:40 AM
  #2  
TheYellaBrick
Senior Member
RACING JUNKIE
 
TheYellaBrick's Avatar
 
Join Date: Mar 2008
Location: Emmett, Idaho
Posts: 7,334
Default

Street - race - high compression ?
Depending on exactly how much any grinding/polishing it will be removing materiel. The end result is change of cylinder volume/compression ratio.
Got Pics ?
TheYellaBrick is offline  
Old 07-19-2011, 01:47 PM
  #3  
robinh
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Mar 2008
Posts: 3
Default

it's a race motor with 13 to 1 compression.

here's some pics:

[img][/img]

[/img][img]

[/img][img]

[/img][img][/img]

I realize I'd be changing the compression ratio. Just want to smooth things out to avoid detonation.
robinh is offline  
Old 07-19-2011, 04:52 PM
  #4  
wazup
Senior Member
EXPERT BUILDER
 
Join Date: Dec 2010
Posts: 345
Default

Get a port and polish kit and it will clean up fine with that. I would pull the pistons on those cylinders and check the ring lands and make sure the rings move free and check the valves to make sure they did not get bent.

Good luck i hope it turns out well for you.

Robert Fla.
wazup is offline  
Old 07-19-2011, 07:33 PM
  #5  
TheYellaBrick
Senior Member
RACING JUNKIE
 
TheYellaBrick's Avatar
 
Join Date: Mar 2008
Location: Emmett, Idaho
Posts: 7,334
Default


IMHO; I'd replace the affected pistons, smooth out the heads, CC the affected/smoothed chambers, and match the rest of the good chambers on both heads. CR will be a tad less but all the cylinders will be the same.

------------
TheYellaBrick is offline  
Old 07-19-2011, 07:34 PM
  #6  
zipper06
Senior Member
RACING JUNKIE
 
Join Date: Jan 2006
Location: La.
Posts: 2,890
Default

Originally Posted by wazup
Get a port and polish kit and it will clean up fine with that. I would pull the pistons on those cylinders and check the ring lands and make sure the rings move free and check the valves to make sure they did not get bent.

Good luck i hope it turns out well for you.

Robert Fla.
Spot On.

JMO

Zip.
zipper06 is offline  
Old 07-20-2011, 09:07 AM
  #7  
TS1955
Senior Member
DYNO OPERATOR
 
Join Date: Aug 2007
Location: Lost Creek, WV
Posts: 533
Default

I agree with DD. Replace the pistons on the two cylinders. Repair the chambers. The pistons could have small fractures and come apart. JMO

TS1955
TS1955 is offline  
Old 07-21-2011, 08:41 AM
  #8  
robinh
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Mar 2008
Posts: 3
Default

I think replacing the pistons and repairing the heads is what I'll do. Thanks for the advice.
robinh is offline  
Old 07-21-2011, 10:05 AM
  #9  
itsabird
Senior Member
RACING JUNKIE
 
Join Date: Dec 2007
Location: ohio
Posts: 816
Default

Good advice, i have seen a lot worse, maybe a light reserface pass on the heads.
itsabird 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


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -