Olds ticket to 9s... LS swap adventure.

[64nailhead]

Have you verified timing?

And 116% VE at 10 psi is suspect as well.

Lastly, drop the damn hammer - 69% TPS?? Hehe - I know, it can be nerve racking to truly 'floor it' when it's making steam and your trying to tune - it took me 2 + years to be able to stand on it. Especially considering the boost doesn't care where the throttle plate is as long as it more than 50-55% open.

 

[Northernregal]

10psi and 10* timing advance is a good starting point for all basic pump gas builds. It is usually safe to go up from there with timing and airflow (because more boost doesn't always equate to more air mass). The quality of fuel, static compression, and physical attributes of an engine with dictate how far you can go.

Thanks for the input Mike, I think that's exactly what I am going to try going forward.

Have you verified timing?

And 116% VE at 10 psi is suspect as well.

Lastly, drop the damn hammer - 69% TPS?? Hehe - I know, it can be nerve racking to truly 'floor it' when it's making steam and your trying to tune - it took me 2 + years to be able to stand on it. Especially considering the boost doesn't care where the throttle plate is as long as it more than 50-55% open.

Timing verification is on today's list to do.

In my defense that spot on the log when it hit 10psi was right as I was backing out. I had it at 85% TPS. 😉

 

[Northernregal]

Time to prep the next victim I guess.

Pulled the valve covers off, all the rockers are good. Checked the timing, even for my crude method its close enough, +/- 2 degrees, corrected down 2 degrees anyway.

Then I did something I had been thinking about. Moved the turbo oil feed to the oil filter from the top of the block. Then fired it up.

This probably isn't good.

Either way I have two weeks to think about my plan of attack. I ship out to work at midnight.

 

[Tony1968]

Before I go back through 16 pages did you rebuild this engine or is it just a take out?
Maybe you lost a lifter? Or rod knock (i hope not)....?
Stethoscope time

 

[Northernregal]

Before I go back through 16 pages did you rebuild this engine or is it just a take out?
Maybe you lost a lifter? Or rod knock (i hope not)....?
Stethoscope time

Its the motor I rebuilt for my regal. Nothing more than a refresh on the rings and bearings, LS7 lifters, BTR stage 2 turbo cam, head and main studs, LS9 head gaskets, dingle ball hone and send.

I think i know what happened. I think i screwed up when I did the TDC check with the piston stop and bent a valve on #1. If the piston is good ill slap on my 799s and send it.

 

[Tony1968]

Its the motor I rebuilt for my regal. Nothing more than a refresh on the rings and bearings, LS7 lifters, BTR stage 2 turbo cam, head and main studs, LS9 head gaskets, dingle ball hone and send.

I think i know what happened. I think i screwed up when I did the TDC check with the piston stop and bent a valve on #1. If the piston is good ill slap on my 799s and send it.

Ok. And I'm not asking this to bust anyone's chops but why did you do a TDC check? Unless you were degreeing the cam?

 

[Northernregal]

Ok. And I'm not asking this to bust anyone's chops but why did you do a TDC check? Unless you were degreeing the cam?

To verify timing. Since an LS doesnt have timing marks you have to mark the crank pulley manually. Unfortunately in the process the TDC tool can contact the exhaust valve. Right now I'm thinking that's my problem.

 

[Turbolq4]

Sounds valvetrainy. Too fast and high pitched to be rod knock.

 

[Northernregal]

Sounds valvetrainy. Too fast and high pitched to be rod knock.

Like every LS guy, thankfully I have several sets of spare heads...

 

[64nailhead]

Very interested to see what occurred. I think it's below the head and above the rod. But what do I know, that could be as simple as a failed push rod, lifter or rocker as well. It would be nice to know if the timing was correct or not before you take it apart as well.

Good luck - Jim.


Tony - verifying timing on an LS is easily done erroneously with a piston stop if the valves aren't backed off on #1 cylinder when using a piston stop. Reason being that the valve, exhaust I believe, contacts the piston stop giving the feeling that the piston is hitting it rather than the valve, thus causing an erroneous TDC mark on the balancer. Sloppy Mechanics' Matt Happel repeatedly blew up motors in his Colorado due to this issue, until he figured it out. It can be found in his YouTube videos. It caused him t have the timing advanced somewhere in the area of 12-15 degrees IIRC.