My DynoTune Went Horribly Wrong...
Le Mans Master
Joined: Aug 2001
Posts: 8,145
Likes: 1
From: Bradenton FLORIDA
If the bearing clearance really is .003, that could cause a knock and low oil pressure. Clearance should be .0025 MAX, and should actually be tighter than that.
Did you have the crank miked? I have seen out of round journals be passed right over by a machine shop. On a crank that they polished no less. An OOR journal will cause an engine knock after only a few hundred miles. It wont spin a bearing but it will egg one out.
At this point I would be looking at a complete tear down.
BTW, I would also increase the top ring gap .003-.005. Better too loose than too tight when it comes to top ring end gaps. ESP with hypereutectics.
Did you have the crank miked? I have seen out of round journals be passed right over by a machine shop. On a crank that they polished no less. An OOR journal will cause an engine knock after only a few hundred miles. It wont spin a bearing but it will egg one out.
At this point I would be looking at a complete tear down.
BTW, I would also increase the top ring gap .003-.005. Better too loose than too tight when it comes to top ring end gaps. ESP with hypereutectics.
We like .002-.0025 on street motors (rods no more than .002) but may go a little looser on our race motors.
Thread Starter
Drifting
Joined: Apr 2007
Posts: 1,848
Likes: 1
From: Central Florida
I can't confirm weather it's a knock or valvetrain til I get good oil pressure first. Many members have reported engine noise from low pressure and it had ended up being valve train. What about the loss of power.. Does anyone have an explanation for that? I showed the compression test results and they all checked between 190-211. The leak down checked good as well with 5% Being leaked into the crankcase . So what gives? What do you guys think?
Last edited by BonestockZ06; Dec 3, 2007 at 02:13 PM.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
It probably has been said already but it sure sounds like a spun bearing!
my buddy had his do this and it spun the bearing and ended up with a cracked piston!
Please prove me wrong! My best to you!
Thanks,Matt
my buddy had his do this and it spun the bearing and ended up with a cracked piston!
Please prove me wrong! My best to you!
Thanks,Matt
Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
How could you have not cut the filter open yet? (It takes less than five minutes!).
Then you can breathe easy about possible lower end issues and/or solved your problem (assuming you see bearing material in the pleats). Or should I say at least know for a fact what your dealing with. A spun bearing is the last thing you want to confirm but it happens. As others have stated, your clearances are a bit too loose as well.
Go to a good parts store and buy a filter cutter....they work great and everyone serious about their engines should own one to moniter their condition.
Good luck....
Tony
Then you can breathe easy about possible lower end issues and/or solved your problem (assuming you see bearing material in the pleats). Or should I say at least know for a fact what your dealing with. A spun bearing is the last thing you want to confirm but it happens. As others have stated, your clearances are a bit too loose as well.
Go to a good parts store and buy a filter cutter....they work great and everyone serious about their engines should own one to moniter their condition.
Good luck....
Tony
Last edited by Tony Mamo @ AFR; Nov 30, 2007 at 06:15 PM.
Thread Starter
Drifting
Joined: Apr 2007
Posts: 1,848
Likes: 1
From: Central Florida
How could you have not cut the filter open yet? (It takes less than five minutes!).
Then you can breathe easy about possible lower end issues and/or solved your problem (assuming you see bearing material in the pleats). Or should I say at least know for a fact what your dealing with. A spun bearing is the last thing you want to confirm but it happens. As others have stated, your clearances are a bit too loose as well.
Go to a good parts store and buy a filter cutter....they work great and everyone serious about their engines should own one to moniter their condition.
Good luck....
Tony
Then you can breathe easy about possible lower end issues and/or solved your problem (assuming you see bearing material in the pleats). Or should I say at least know for a fact what your dealing with. A spun bearing is the last thing you want to confirm but it happens. As others have stated, your clearances are a bit too loose as well.
Go to a good parts store and buy a filter cutter....they work great and everyone serious about their engines should own one to moniter their condition.
Good luck....
Tony
Update:
Following Tony's suggestion, I went and cut open my oil filter and found most of my bearings in powder form laying right in there.. Millions of gold particles, some the size of small flakes... I guess I won't be posting much for a long time to come.. With the holidays around the corner and all these damn bills catching up to me, it will be a while.
To all the guys that posted, I appreciate your help. And to Chris at ECS, thank you for your offer over PM, I will definitely give you a call and hope you remember me when the time comes..
Last edited by BonestockZ06; Nov 30, 2007 at 08:40 PM. Reason: Update: Found the problem..
Le Mans Master
Joined: Aug 2001
Posts: 8,145
Likes: 1
From: Bradenton FLORIDA
How could you have not cut the filter open yet? (It takes less than five minutes!).
Then you can breathe easy about possible lower end issues and/or solved your problem (assuming you see bearing material in the pleats). Or should I say at least know for a fact what your dealing with. A spun bearing is the last thing you want to confirm but it happens. As others have stated, your clearances are a bit too loose as well.
Go to a good parts store and buy a filter cutter....they work great and everyone serious about their engines should own one to moniter their condition.
Good luck....
Tony
Then you can breathe easy about possible lower end issues and/or solved your problem (assuming you see bearing material in the pleats). Or should I say at least know for a fact what your dealing with. A spun bearing is the last thing you want to confirm but it happens. As others have stated, your clearances are a bit too loose as well.
Go to a good parts store and buy a filter cutter....they work great and everyone serious about their engines should own one to moniter their condition.
Good luck....
Tony
Right on Tony We keep one in the shop & it gets used regularly. Reher Morrison sells a nice billet one, but you can use a cut-off wheel in a pinch. Just clamp the rolled edge of the filter in a vice & cut it as close to the rolled edge as possible. Don't wory about the debris from the cutting...it will be silver & you are looking for copper/brass color in the pleats themselves.
Instructor
Joined: Jul 2004
Posts: 177
Likes: 0
From: Tampa FL
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Precisely.. I don't own a filter cutter...
Update:
Following Tony's suggestion, I went and cut open my oil filter and found most of my bearings in powder form laying right in there.. Millions of gold particles, some the size of small flakes... I guess I won't be posting much for a long time to come.. With the holidays around the corner and all these damn bills catching up to me, it will be a while.
To all the guys that posted, I appreciate your help. And to Chris at ECS, thank you for your offer over PM, I will definitely give you a call and hope you remember me when the time comes..
Update:
Following Tony's suggestion, I went and cut open my oil filter and found most of my bearings in powder form laying right in there.. Millions of gold particles, some the size of small flakes... I guess I won't be posting much for a long time to come.. With the holidays around the corner and all these damn bills catching up to me, it will be a while.
To all the guys that posted, I appreciate your help. And to Chris at ECS, thank you for your offer over PM, I will definitely give you a call and hope you remember me when the time comes..
We're lucky to have such a good shop like ECS close by in Jersey. They will take care of you. They did for me.
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Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
Sorry to hear that it is worse than originally thought.
I know how you feel, my vette has been down for 3 years now, long story
Time to send it out to a machine shop and get forged rods and pistons. I would also have them check over the rest of the motor as it seems unusual to have spun a bearing unless something was really out of spec.
I know how you feel, my vette has been down for 3 years now, long story
Time to send it out to a machine shop and get forged rods and pistons. I would also have them check over the rest of the motor as it seems unusual to have spun a bearing unless something was really out of spec.
Thread Starter
Drifting
Joined: Apr 2007
Posts: 1,848
Likes: 1
From: Central Florida
The thing that bums me out the most is that I spent all I had to spare on that motor and have nothing left to build or buy another one or parts for that matter. Thats why I know it's going to be a while..
Sorry to hear that it is worse than originally thought.
I know how you feel, my vette has been down for 3 years now, long story
Time to send it out to a machine shop and get forged rods and pistons. I would also have them check over the rest of the motor as it seems unusual to have spun a bearing unless something was really out of spec.
I know how you feel, my vette has been down for 3 years now, long story
Time to send it out to a machine shop and get forged rods and pistons. I would also have them check over the rest of the motor as it seems unusual to have spun a bearing unless something was really out of spec.
Team Owner
Joined: Jul 2004
Posts: 24,652
Likes: 298
From: NJ
St. Jude Donor '05-'08
The thing that bums me out the most is that I spent all I had to spare on that motor and have nothing left to build or buy another one or parts for that matter. Thats why I know it's going to be a while..
It will be a while, but it will definitely be a built new motor..
It will be a while, but it will definitely be a built new motor..
Keep ECS up to date with your plans and we will help you out.
Bob
Thread Starter
Drifting
Joined: Apr 2007
Posts: 1,848
Likes: 1
From: Central Florida
Santa is around, just no for me... 
Thread Starter
Drifting
Joined: Apr 2007
Posts: 1,848
Likes: 1
From: Central Florida
I appreciate your offer, but in the mist of sorting things out I had ordered a new one.. Thanks again.
Your offer is greatly appreciated it, but I'm no financial position right now to deal with this issue.. I'll be able to see where I stand after the holidays and decide then what my options are.
I've got a long block with 8800 original miles. Out of a 01 Fbody, 241 heads. Reasonably priced. PM if interested.
Drifting
Joined: Jul 2006
Posts: 1,700
Likes: 60
From: Springfield IL
http://cgi.ebay.com/ebaymotors/H-BEA...spagenameZWD1V
If you call him to order it, he will knock off a decent amount on shipping.
http://cgi.ebay.com/ebaymotors/Chevy...spagenameZWD1V
Reground with bearings to match it, so all you'd have to do machine wise is have the cylinders honed to a 3.9035 (for a 3.903 piston), check the mains, and knock new cam bearings in.
This is all of course when you are able to spare some change.
I've seen this setup take a 225 shot for a season (so far) without an issue.
Just something to think about to brighten your day..... a built motor for about a 1000 dollars
If you call him to order it, he will knock off a decent amount on shipping.
http://cgi.ebay.com/ebaymotors/Chevy...spagenameZWD1V
Reground with bearings to match it, so all you'd have to do machine wise is have the cylinders honed to a 3.9035 (for a 3.903 piston), check the mains, and knock new cam bearings in.
This is all of course when you are able to spare some change.
I've seen this setup take a 225 shot for a season (so far) without an issue.
Just something to think about to brighten your day..... a built motor for about a 1000 dollars
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
No problem. Sorry about the bad luck. It really sucks this time of year. When you're ready, post or pm, I've always got good pull outs. If you're interested.
Thread Starter
Drifting
Joined: Apr 2007
Posts: 1,848
Likes: 1
From: Central Florida
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
I don't know if it will help, but I've got a good stock crank, bearing caps, and bearings, and umm 7 pistons if you want. I see you're in Jersey, just not sure where OB is. I'm in Bergen County. If you want you can drive by and look at the stuff. Consider it a donation. I was going to sell the crank and caps, but I can 'loan' you this stuff for a while. I even have a new eighth piston with pin, rod, rings, and main bearing. It's taking up space in my cellar. I cracked the old block, so I'm getting a new shortblock from a source for my 'back to stock' build.
you this stuff for a while. I even have a new eighth piston with pin, rod, rings, and main bearing. It's taking up space in my cellar. I cracked the old block, so I'm getting a new shortblock from a source for my 'back to stock' build.