HOME MAGAZINE FORUM RULES SPONSORS CONTACT
     
   
   
 
Go Back   CLASS RACER FORUM > Class Racer Forums > Class Racer Builds

Reply
 
Thread Tools Display Modes
Old Yesterday, 08:43 PM   #1061
Nmbr1GMfan
VIP Member
 
Join Date: Aug 2013
Posts: 1,065
Likes: 137
Liked 258 Times in 95 Posts
Default Re: H-I-J '76 Nova re-fit.

Quote:
Originally Posted by FED 387 View Post
Looking at that picture of the bad bearing one side appears to be more worn than the other side that is from left to right do all the others have the same wear pattern???
Of the bearings showing copper, yes. You can see in the picture, the bearings that were real bad have the same pattern, worn more on one side than the other. The other weird thing about it is, as you can see some bearings are worn and some are worn really bad (showing copper), the worn bearings are #'s 2-4-6-8, the bearings really bad (showing copper) are from 1-3-5-7.
__________________
Todd Greene
"Whatever you do ...don't change anything...Just wait 20 years for the good weather". -Mark Yacavone
Nmbr1GMfan is online now   Reply With Quote
Old Yesterday, 08:45 PM   #1062
Nmbr1GMfan
VIP Member
 
Join Date: Aug 2013
Posts: 1,065
Likes: 137
Liked 258 Times in 95 Posts
Default Re: H-I-J '76 Nova re-fit.

Quote:
Originally Posted by HP HUNTER View Post
Yes, I do assume the crank was wet magged?
It was not.
__________________
Todd Greene
"Whatever you do ...don't change anything...Just wait 20 years for the good weather". -Mark Yacavone
Nmbr1GMfan is online now   Reply With Quote
Old Yesterday, 10:06 PM   #1063
FED 387
VIP Member
 
Join Date: Jun 2006
Posts: 2,907
Likes: 5
Liked 18 Times in 14 Posts
Default Re: H-I-J '76 Nova re-fit.

Not necessarily in this order but it looks like maybe overfilling (too much oil) causing foaming or aeration --- a blocked oil passage or 2,---- a malfunctioning oil pump or pressure relief valve---- improper bearing selection or installation --- since all the bearings show some damage and those on one side more so than the other side-- also is it possible that you have the left pistons installed on the right bank and vice versa looking at the wear??? and finally crud remaining in the engine block after machining --- You'll find just have to keep on looking FED 387
FED 387 is offline   Reply With Quote
Old Yesterday, 10:10 PM   #1064
HP HUNTER
Member
 
Join Date: Feb 2012
Location: Colorado Springs
Posts: 391
Likes: 2
Liked 23 Times in 12 Posts
Default Re: H-I-J '76 Nova re-fit.

Can I see a picture of the crank?
HP HUNTER is online now   Reply With Quote
Old Yesterday, 10:35 PM   #1065
Nmbr1GMfan
VIP Member
 
Join Date: Aug 2013
Posts: 1,065
Likes: 137
Liked 258 Times in 95 Posts
Default Re: H-I-J '76 Nova re-fit.

Quote:
Originally Posted by HP HUNTER View Post
Can I see a picture of the crank?
This is the only one I have as it was coming apart.
__________________
Todd Greene
"Whatever you do ...don't change anything...Just wait 20 years for the good weather". -Mark Yacavone
Nmbr1GMfan is online now   Reply With Quote
Old Yesterday, 10:38 PM   #1066
Nmbr1GMfan
VIP Member
 
Join Date: Aug 2013
Posts: 1,065
Likes: 137
Liked 258 Times in 95 Posts
Default Re: H-I-J '76 Nova re-fit.

Quote:
Originally Posted by FED 387 View Post
Not necessarily in this order but it looks like maybe overfilling (too much oil) causing foaming or aeration --- a blocked oil passage or 2,---- a malfunctioning oil pump or pressure relief valve---- improper bearing selection or installation --- since all the bearings show some damage and those on one side more so than the other side-- also is it possible that you have the left pistons installed on the right bank and vice versa looking at the wear??? and finally crud remaining in the engine block after machining --- You'll find just have to keep on looking FED 387
The rods are the last to get oil, they were starved for oil.
__________________
Todd Greene
"Whatever you do ...don't change anything...Just wait 20 years for the good weather". -Mark Yacavone
Nmbr1GMfan is online now   Reply With Quote
Old Yesterday, 10:49 PM   #1067
FED 387
VIP Member
 
Join Date: Jun 2006
Posts: 2,907
Likes: 5
Liked 18 Times in 14 Posts
Default Re: H-I-J '76 Nova re-fit.

put it back together with new bearings put the CORRECT amount of oil in it fire it up on the dyno then after a few minutes shut it off--- pull the pan see if it has foam--- then turn it over and pop off the rod caps from 5 & 6 see if they look bad --while you are at it may as well check the others too maybe use a "regular" filter instead of that new fancy one you have see if that makes a difference---- might want to check your oil pressure from that small plug front of the engine on top of the block near the timing cover thats the last place that sees oil
FED 387 is offline   Reply With Quote
Old Today, 06:30 AM   #1068
Rich Biebel
VIP Member
 
Rich Biebel's Avatar
 
Join Date: Jun 2007
Location: Northern New Jersey suburbs
Posts: 1,935
Likes: 3
Liked 66 Times in 30 Posts
Default Re: H-I-J '76 Nova re-fit.

I can't really tell from the picture....can't see the area that would be a parting line if its cast.....

Is it a steel crank or cast ?

A manual trans with a cast crank was never a good idea in my mind.....

Not sayin it cant be done or if that has anything to do with this failure but if I'm letting a clutch out at 5000-6000rpm and maybe on a 2 step I'm a lot happier with a steel crank in there....

I have used cast cranks and had one in my LT-1 stocker.....automatic trans though...…

Dial bore the rod big ends to see if they might be tapered.....Unless they were cut and rehoned that's pretty unlikely.....

Is the thrust OK....? I assume it was....

Looks like most of the trash was soft bearing material fortunately....
__________________
Rich Biebel
S/C 1479
Rich Biebel is online now   Reply With Quote
Old Today, 07:03 AM   #1069
Nmbr1GMfan
VIP Member
 
Join Date: Aug 2013
Posts: 1,065
Likes: 137
Liked 258 Times in 95 Posts
Default Re: H-I-J '76 Nova re-fit.

Quote:
Originally Posted by FED 387 View Post
put it back together with new bearings put the CORRECT amount of oil in it fire it up on the dyno then after a few minutes shut it off--- pull the pan see if it has foam--- then turn it over and pop off the rod caps from 5 & 6 see if they look bad --while you are at it may as well check the others too maybe use a "regular" filter instead of that new fancy one you have see if that makes a difference---- might want to check your oil pressure from that small plug front of the engine on top of the block near the timing cover thats the last place that sees oil
I already know what happened, the volume drop at the end of the line (rods) was the cause. I had no idea the solid lifters would pump so much more oil to the top coupled with the pressure drop from the EDM holes AND the block being machined for cam oiling in the lifter bores just didn't leave enough volume for the rods, my fault. The filter used was a "regular" filter, and yes checking oil at the front of the block would have been more ideal.
__________________
Todd Greene
"Whatever you do ...don't change anything...Just wait 20 years for the good weather". -Mark Yacavone
Nmbr1GMfan is online now   Reply With Quote
Old Today, 07:06 AM   #1070
Nmbr1GMfan
VIP Member
 
Join Date: Aug 2013
Posts: 1,065
Likes: 137
Liked 258 Times in 95 Posts
Default Re: H-I-J '76 Nova re-fit.

Quote:
Originally Posted by Rich Biebel View Post
I can't really tell from the picture....can't see the area that would be a parting line if its cast.....

Is it a steel crank or cast ?

A manual trans with a cast crank was never a good idea in my mind.....

Not sayin it cant be done or if that has anything to do with this failure but if I'm letting a clutch out at 5000-6000rpm and maybe on a 2 step I'm a lot happier with a steel crank in there....

I have used cast cranks and had one in my LT-1 stocker.....automatic trans though...…

Dial bore the rod big ends to see if they might be tapered.....Unless they were cut and rehoned that's pretty unlikely.....

Is the thrust OK....? I assume it was....

Looks like most of the trash was soft bearing material fortunately....
Crank is a steel one. Rods were fine when checked before assembly, I will check again. Thrust is fine.
__________________
Todd Greene
"Whatever you do ...don't change anything...Just wait 20 years for the good weather". -Mark Yacavone
Nmbr1GMfan is online now   Reply With Quote
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 -5. The time now is 07:08 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.Ad Management plugin by RedTyger