Cranlcase pressurwe video
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
OK, the above video resulted in major crankcase pressure with damaged parts listed below.
Damage =
Cracked block from one head bolt to one cylinder bore
4 = bent push rods
1 = bent valve
3 = broken piston ring lands
So I went to;
Wiseco forged pistons,
Trick Flow Chrome Molly Pushrods
One new valve and all valves were back cut
Ported AFR 210's
New 400 CI block bored to 406CI
New Holley Stealth Ram, shold have pics next week
Damage =
Cracked block from one head bolt to one cylinder bore
4 = bent push rods
1 = bent valve
3 = broken piston ring lands
So I went to;
Wiseco forged pistons,
Trick Flow Chrome Molly Pushrods
One new valve and all valves were back cut
Ported AFR 210's
New 400 CI block bored to 406CI
New Holley Stealth Ram, shold have pics next week
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by LD85
Hey Tim, it could always be worse I guess some pistons coulda flew through the hood.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Originally Posted by LD85
did a leak down test and there was no obvious leakage,
Originally Posted by LD85
Dave,,,It was strange, the leak downs were within 5% ,, and depending
on what I read this is still good.
I think that since they were on the top end of the piston less air leaked
out because the bottoms were sealing some still and probably the air
filling the cylinder "might" have pressurized the cylinder making the
parts expand into the ID, just a guess.
on what I read this is still good.
I think that since they were on the top end of the piston less air leaked
out because the bottoms were sealing some still and probably the air
filling the cylinder "might" have pressurized the cylinder making the
parts expand into the ID, just a guess.
.
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Originally Posted by Slalom4me
Where were the pistons positioned during the leakdown testing?
.
.
The wierd thing is that the ring lands did not come apart until I had the pistons out in my hands and started feeling around on them.
A couple of rings did seperate from the piston but,,,but the lands were still semi attached to the piston
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Originally Posted by CentralCoaster
Sheesh you have a positive outlook. I guess some pistons coulda flew through the hood.
I guess some pistons coulda flew through the hood.1. Forged Pistons always.
2. Check everything very closely before putting it back together.
3. Assume nothing.
4. It always take longer and costs more than I plan.
Race Director
Joined: Aug 2000
Posts: 14,130
Likes: 7
Cruise-In II Veteran
Hey Buddy,
I posted earlier during a T storm and it wouldnt do anything after I hit the button...it froze and i lost everything...just wanted to say hope this time around everything works and falls into place for your motor! You had alot of re tear down to do and wish I could come by and see it all,maybe lend a hand to having wrench on a Vette again.Just seeing it would be great and take my mind off alot of things.
I will PM you soon about the other things...ive been back and forth to Indy so many times its crazy...but will keep ya posted on it all soon.
Thanks again for your help and hope the family and you are doing great!
I posted earlier during a T storm and it wouldnt do anything after I hit the button...it froze and i lost everything...just wanted to say hope this time around everything works and falls into place for your motor! You had alot of re tear down to do and wish I could come by and see it all,maybe lend a hand to having wrench on a Vette again.Just seeing it would be great and take my mind off alot of things.
I will PM you soon about the other things...ive been back and forth to Indy so many times its crazy...but will keep ya posted on it all soon.
Thanks again for your help and hope the family and you are doing great!
