422 LSX Solid Roller, TFS 245's, Billet Wilson & Twin TC78's from KYTP
08-30-2010, 10:39 AM
#483
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Completely different situation and not related, but I had cam bolts back out on me on my heads cam set up. My motor also had the very small SLP under drive pulley.
Got the cam engineer from GM on the phone (somehow dialed through and got him) and he said that in the racing engines that they worked on, if the balancer was more the 10% under driven then the motor created a harmonic that was backing cam bolts out on their race engines.
I drill and wire all of my cam bolts now.
I look forward to hearing how the motor looks once torn down. I bet it looks very good.
Got the cam engineer from GM on the phone (somehow dialed through and got him) and he said that in the racing engines that they worked on, if the balancer was more the 10% under driven then the motor created a harmonic that was backing cam bolts out on their race engines.
I drill and wire all of my cam bolts now.
I look forward to hearing how the motor looks once torn down. I bet it looks very good.
08-30-2010, 02:43 PM
#485
Completely different situation and not related, but I had cam bolts back out on me on my heads cam set up. My motor also had the very small SLP under drive pulley.
Got the cam engineer from GM on the phone (somehow dialed through and got him) and he said that in the racing engines that they worked on, if the balancer was more the 10% under driven then the motor created a harmonic that was backing cam bolts out on their race engines.
I drill and wire all of my cam bolts now.
I look forward to hearing how the motor looks once torn down. I bet it looks very good.
Got the cam engineer from GM on the phone (somehow dialed through and got him) and he said that in the racing engines that they worked on, if the balancer was more the 10% under driven then the motor created a harmonic that was backing cam bolts out on their race engines.
I drill and wire all of my cam bolts now.
I look forward to hearing how the motor looks once torn down. I bet it looks very good.
Currently using a 25% underdrive.
08-30-2010, 04:10 PM
#486
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Yeah, good idea to add a harmonic balancer.
Actually the cam bolts backed out twice on my motor. This was all installed and fixed by the company that did the heads cam. The second time it happened they told me that my cam shaft bore and crank shaft bore were not in alignment and that the motor needed to be line honed and rebuilt.
The car never went back to them. I never let anyone touch the car after that.
This stuff happens to me also. 300-500 dollars for a balancer and now there's double that in repair fee's.
Sweet ride and good luck.
Actually the cam bolts backed out twice on my motor. This was all installed and fixed by the company that did the heads cam. The second time it happened they told me that my cam shaft bore and crank shaft bore were not in alignment and that the motor needed to be line honed and rebuilt.
The car never went back to them. I never let anyone touch the car after that.
This stuff happens to me also. 300-500 dollars for a balancer and now there's double that in repair fee's.
Sweet ride and good luck.
08-31-2010, 07:20 PM
#493
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PS - Just joking! Sucks to see that it has to be torn down, but I can't believe he didn't have an ATI super damper on that thing, kind of just assumed he did, good investment to get now. And tell Mike to stop letting other people in his shop put that motor together, no excuse for no loctite on those bolts, they only torque down to 26lbs or something like that, loctite is your friend!
Last edited by Loudmouth LS1; 08-31-2010 at 07:26 PM.
08-31-2010, 07:41 PM
#494
Eh, just fix that head and file that **** down on the piston, it'll be just fine, hahah!!!!
PS - Just joking! Sucks to see that it has to be torn down, but I can't believe he didn't have an ATI super damper on that thing, kind of just assumed he did, good investment to get now. And tell Mike to stop letting other people in his shop put that motor together, no excuse for no loctite on those bolts, they only torque down to 18lbs or something like that, loctite is your friend!
PS - Just joking! Sucks to see that it has to be torn down, but I can't believe he didn't have an ATI super damper on that thing, kind of just assumed he did, good investment to get now. And tell Mike to stop letting other people in his shop put that motor together, no excuse for no loctite on those bolts, they only torque down to 18lbs or something like that, loctite is your friend!
As for the dampener, not sure if he is going to a balancer or wire up the bolts. Balancer will force us to move the drains for the turbos. It's really nice the way that it is.
We are going to go a little bigger on the cam. I was not aware that he had 1.6 rockers when I spec'd the last one which means that his last cam was actually a .586 lift.
Going to step up to a .63x ish lift in the low 250's duration.
Mike offered to give him a belt drive and dry sump setup but the jury is way out on that. He's not crazy about the idea of turning it into a race car. He's still thinking about putting A/C in.
.
08-31-2010, 08:02 PM
#495
He's got 2 extra pistons from when he had them custom made. There was another slug that didn't get hit quit as hard but got hit by an intake valve. I think he going to change them both.
Mike @ TEC said that there is no way that he didn't put loctite on there but I have never seen ALL the loctite disappear without a trace on a bolt or the corresponding threads.
As for the dampener, not sure if he is going to a balancer or wire up the bolts. Balancer will force us to move the drains for the turbos. It's really nice the way that it is.
We are going to go a little bigger on the cam. I was not aware that he had 1.6 rockers when I spec'd the last one which means that his last cam was actually a .586 lift.
Going to step up to a .63x ish lift in the low 250's duration.
Mike offered to give him a belt drive and dry sump setup but the jury is way out on that. He's not crazy about the idea of turning it into a race car. He's still thinking about putting A/C in.
.
Mike @ TEC said that there is no way that he didn't put loctite on there but I have never seen ALL the loctite disappear without a trace on a bolt or the corresponding threads.
As for the dampener, not sure if he is going to a balancer or wire up the bolts. Balancer will force us to move the drains for the turbos. It's really nice the way that it is.
We are going to go a little bigger on the cam. I was not aware that he had 1.6 rockers when I spec'd the last one which means that his last cam was actually a .586 lift.
Going to step up to a .63x ish lift in the low 250's duration.
Mike offered to give him a belt drive and dry sump setup but the jury is way out on that. He's not crazy about the idea of turning it into a race car. He's still thinking about putting A/C in.
.
Did anything blow through the motor and into the turbine wheels?? Let me know if they did.
09-01-2010, 11:22 AM
#498
Correction on the cam. After looking closer at the cam card that he sent me, I called him back asked if he was sure that was it because it didn't look right to me. He verified with the engine builder to see if the numbers matched and they didn't. Turns out that is BonnarLS1's cam.
So Steve's cam corrected for the 1.6 rockers is a 248/248 .611/.611. The front of the cam is a little beat up but if it's reuseable, he will be reusing it. Mike is going to put in 2 more dowels and wire the bolts. No balancer.
So Steve's cam corrected for the 1.6 rockers is a 248/248 .611/.611. The front of the cam is a little beat up but if it's reuseable, he will be reusing it. Mike is going to put in 2 more dowels and wire the bolts. No balancer.
09-01-2010, 07:12 PM
#499
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Just spent the last roughly 2 hours reading through the entire thread. Great stuff. Makes you realize how much work goes into a project that's designed to haul the mail in 7.9x seconds. Major props to you guys for going through hell and sticking with it. No way I could do it. I hope it eventually smooths out and the cost of repairs goes down and the amount of fun and actually enjoying the car goes up. Anyways, just wanted to say thanks for sharing all the information. Best of luck and keep up the great work. Subscribed for all future updates.
09-01-2010, 10:37 PM
#500
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Cobra, I would like to give my 2 cents. There will be nothing holding those dowels in. Both times my bolts backed out I found the dowel pin in the bottom of the pan. They were first to come out before the bolts.
The bolts will be wired and can't back out, but the pins are pressed in and still vulnerable to vibrating out. Maybe some type of epoxy can be used
Just a thought.
The bolts will be wired and can't back out, but the pins are pressed in and still vulnerable to vibrating out. Maybe some type of epoxy can be used
Just a thought.