I think I blew it up AGAIN! - Page 19 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-22-2011, 01:32 AM   #181
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Originally Posted by RobertISaar View Post
IMO, lean condition(and possibly too much advance) caused detonation/preignition, causing spectacular HG explosion.

as long as that can be kept under control, stock/stock replacement HGs should be fine.

the MLS gaskets would just tolerate it longer before letting go, potentially killing a piston/rod along the way.
Had to bring this back because Robert had a very good point. If it isn't the gasket, it will be a piston soon enough. I don't think I've ever seen someone blow a head gasket with 4 PSI of boost that quickly.
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Old 04-22-2011, 01:35 AM   #182
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Meh, my ADD kicked in as I got bored and I skipped alot of pages. :-p
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Old 04-22-2011, 01:43 AM   #183
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There is absolutely no way it was a detonation problem this time. AFR was 11.5 and I retarded timing 5 degrees across the entire map above 100kpa. The fact that a gasket went again leads me to believe that maybe they just can't handle boost?

We'll see what a teardown reveals. Hopefully I won't have any issues towing my car home tomorrow, like it won't be there when I get there :O

I'm dumbfounded at this point. I have no idea why it blew again, or why this time it'* not mixing coolant into the oil, or how I'm loosing oil but not on the ground.

Maybe a piston ring causing severe blow by and oil burn?
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Old 04-22-2011, 01:47 AM   #184
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There is absolutely no way it was a detonation problem this time. AFR was 11.5 and I retarded timing 5 degrees across the entire map above 100kpa. The fact that a gasket went again leads me to believe that maybe they just can't handle boost?

We'll see what a teardown reveals. Hopefully I won't have any issues towing my car home tomorrow, like it won't be there when I get there :O

I'm dumbfounded at this point. I have no idea why it blew again, or why this time it'* not mixing coolant into the oil, or how I'm loosing oil but not on the ground.

Maybe a piston ring causing severe blow by and oil burn?
If it wasn't something wrong with your tune, you need to seriously consider a 3800 or another TGP motor. I know you don't want to hear it, and I know you <3 the 3500 or similar 60*V6 engines, but this is ridiculous. WRX and DSM guys don't blow head gaskets this fast.

If the piston rings couldn't hold the boost, this engine should not be boosted.

I like giving you a hard time about this but at this point I genuinely want to see this car on the road. I know what it feels like to put a lot of work into a car and have it epically fail on you (remember the Jag XJS thread?) right when you thought you were done.
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Old 04-22-2011, 01:56 AM   #185
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This is a natural part of a build like this. Find the weakest link and build it stronger, break it again, fix it again.

NONE of the other turbo 3500s are having nearly as much trouble as I am. It makes me wonder what I'm doing differently than them. Should I assume that everyone else who turbo'd their 3500 bought MLS gaskets?

And what'* this crap about the 07+ 3500s getting MLS gaskets from the factory. Did GM know something that I'm just now figuring out?
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Old 04-22-2011, 02:34 AM   #186
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Originally Posted by Jonpro03 View Post
This is a natural part of a build like this. Find the weakest link and build it stronger, break it again, fix it again.

NONE of the other turbo 3500s are having nearly as much trouble as I am. It makes me wonder what I'm doing differently than them. Should I assume that everyone else who turbo'd their 3500 bought MLS gaskets?

And what'* this crap about the 07+ 3500s getting MLS gaskets from the factory. Did GM know something that I'm just now figuring out?
I'm going to guess that you're doing something differently. I don't know of anyone who blew a head gaskets on 4psi. Not even that guy we had on w-body with the turbo Geo Metro blew as many head gaskets as you have. Go over all of your settings and sensors with a fine toothed comb before putting it back together. I can't imagine replacing replacing these gaskets being cheap.
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Old 04-22-2011, 08:07 AM   #187
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you check the block to make sure you didnt warp them, and check the block for trueness
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Old 04-22-2011, 09:02 AM   #188
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You need to look things over real close and figure out what failed. IF it was a head gasket, you may have simply messed up installing them. If the head gasket blew between 2 cylinders, you will loose no coolant, just compression. Did the engine run rough after the opps? If so, and loosing oil has me thinking you may have bent a valve. We can guess all day, but only a tear down will show what it is. And you do know that means lots of pictures.
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Old 04-22-2011, 09:15 AM   #189
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Yeah, I plan to tear it down soon. But first I need to figure out how to get it home. It'* an hour away right now. I want to tow it with Sarahs truck, but I've never towed a car before so I'm a little scared of doing it.
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Old 04-22-2011, 09:27 AM   #190
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If it'* on a tow dolly, it'* just like pulling a trailer. Nothing to worry about. Be sure to strap the tires down tight, and anchor it to the dolly. However, U haul has a weight limit on the dollies, like 3500 pounds I think. So be sure to say your pulling a Neon or something small.
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