Go Back   PowerStrokeArmy > Power Strokes > 6.4 Aftermarket

Reply
 
Thread Tools Display Modes
  #1  
Old 02-03-2013, 07:36 PM
78f100's Avatar
78f100 78f100 is offline
Major
Member's Gallery
 
Join Date: Oct 2011
Location: Bonifay FL
Posts: 1,641
Default How much piston to cyl clearance can we get by with?

What is the max piston to wall clearance you guys would run on a 6.4? My old block definatly needs boring but I bought a spare motor that measures out good except one cly # 8. It had a blown egr cooler and bent rod in that hole. I think I can get by with honing and should end up with close to .06 piston to wall clearance.
The manual I have says factory is .018 to .037 seems kinda tight to me, but this is my first diesel engine bottom end.
__________________
08 F250 ccsb 11.99 f/o @ 8400#.
08 rclb race truck coming soon!


Lord help me be the man my son thinks I am.

Last edited by 78f100; 02-03-2013 at 07:54 PM.
  #2  
Old 02-03-2013, 07:48 PM
BOSS450's Avatar
BOSS450 BOSS450 is offline
Sergeant
Member's Gallery
 
Join Date: Sep 2011
Location: Concord, NC
Posts: 466
Default

.06?
__________________
2008 f-450 cclb 4x4
2008 f-350 rclb 4x4
  #3  
Old 02-03-2013, 08:00 PM
78f100's Avatar
78f100 78f100 is offline
Major
Member's Gallery
 
Join Date: Oct 2011
Location: Bonifay FL
Posts: 1,641
Default

Quote:
Originally Posted by BOSS450 View Post
.06?
Thanks, thats what I meant. I changed it
__________________
08 F250 ccsb 11.99 f/o @ 8400#.
08 rclb race truck coming soon!


Lord help me be the man my son thinks I am.
  #4  
Old 02-03-2013, 10:22 PM
kdogg85 kdogg85 is offline
Sergeant
Member's Gallery
 
Join Date: Nov 2011
Posts: 200
Default

These need to be tight due to pressure and the unreal blowby you can have. I would suggest at least sleeving it if you can't swing new pistons and rings.
__________________
07 f250 crushed

'10 f250 ccsb 4x4, 366/515, 200hp home brews and personally tuned
  #5  
Old 02-03-2013, 10:44 PM
78f100's Avatar
78f100 78f100 is offline
Major
Member's Gallery
 
Join Date: Oct 2011
Location: Bonifay FL
Posts: 1,641
Default

Quote:
Originally Posted by kdogg85 View Post
These need to be tight due to pressure and the unreal blowby you can have. I would suggest at least sleeving it if you can't swing new pistons and rings.
I am wanting to run IH pistons in it is the reason I'm asking. I still plan to build my other motor I will bore it .030 and use machined Ford pistons in it if the IH oversized pistons still are not available. I want the other motor for a spare, or may pick up a reg cab to put it in.

Like I said I'm not a diesel engine builder but .018 to .037 seems reall tight to me. I know they are totally dif engines but the cummins guys run way more clearance than that. And gas engines usually are looser too.
__________________
08 F250 ccsb 11.99 f/o @ 8400#.
08 rclb race truck coming soon!


Lord help me be the man my son thinks I am.

Last edited by 78f100; 02-03-2013 at 10:49 PM.
  #6  
Old 02-03-2013, 10:47 PM
4.0l sahara's Avatar
4.0l sahara 4.0l sahara is offline
Major
Member's Gallery
 
Join Date: Dec 2011
Location: shelton,ct
Posts: 1,457
Default

I think you mean .006 not .06? .006 is way to much imo.
__________________
Champion Transmission & Diesel Performance
Phone-203-931-6178
old antiquated pos with some crap bw s467 fmw,irate rr/full fuel system,full force 350/200 injectors,irate SS gated t4 mount,arp studs,smith bro push rods,comp 910's, gen3, twin ipr's, ams1000 with co2, champion built 4r100,tuned by bill, etc
  #7  
Old 02-03-2013, 10:59 PM
78f100's Avatar
78f100 78f100 is offline
Major
Member's Gallery
 
Join Date: Oct 2011
Location: Bonifay FL
Posts: 1,641
Default

I was writing my measurements wrong add a .0 to them, I'm new at this...lol.
It should be .006 and the manual says factory is .0018 to .0037

All my measurements are correct I have tripple checked, I just wasnt writing them right.
__________________
08 F250 ccsb 11.99 f/o @ 8400#.
08 rclb race truck coming soon!


Lord help me be the man my son thinks I am.

Last edited by 78f100; 02-03-2013 at 11:02 PM.
  #8  
Old 02-04-2013, 01:20 AM
78f100's Avatar
78f100 78f100 is offline
Major
Member's Gallery
 
Join Date: Oct 2011
Location: Bonifay FL
Posts: 1,641
Default

Any one else have thoughts on this?
I read all the time where guys are just putting new IH pistons in. There is no way their cyl's are still at factory spec. Or am I wrong about this?, both my blocks have about 100k on them and are really close on bore wear. Cly 7 & 8 are always worse from the regens. Mid bore on both engines is really good but at the top of the stroke where the piston rocks is where most of the wear is.

Are folks just slapping in new pistons and not checking bores? I am curious how every one is getting by running IH pistons.
__________________
08 F250 ccsb 11.99 f/o @ 8400#.
08 rclb race truck coming soon!


Lord help me be the man my son thinks I am.
  #9  
Old 02-04-2013, 06:03 AM
4.0l sahara's Avatar
4.0l sahara 4.0l sahara is offline
Major
Member's Gallery
 
Join Date: Dec 2011
Location: shelton,ct
Posts: 1,457
Default

I would be more worried with cylinder out of round. Have you checked to see how out of round the bore is?
__________________
Champion Transmission & Diesel Performance
Phone-203-931-6178
old antiquated pos with some crap bw s467 fmw,irate rr/full fuel system,full force 350/200 injectors,irate SS gated t4 mount,arp studs,smith bro push rods,comp 910's, gen3, twin ipr's, ams1000 with co2, champion built 4r100,tuned by bill, etc
  #10  
Old 02-04-2013, 07:09 AM
LovinPSDs LovinPSDs is online now
Major
Member's Gallery
 
Join Date: Dec 2011
Location: Houston, Tx
Posts: 1,108
Default

why not go with Elite HD pistons or something instead of just IH pistons? I believe those guys can get you a .30 over, with proper machining done, and coated.
__________________
12' TDI Jetta until I finish my Masters
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -6. The time now is 11:07 AM.

 

Powered by vBulletin®
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Designed by Military Ltd