Turbo engine rebuild (New Title)

[clownmidget]

Apolgize for the cross post but maybe someone can help. Mods feel free to delete if not appropriate. Thanks.
https://forum.ih8mud.com/az-copper-state-cruisers/398536-real-time-help-flag-abq-i-40-a.html

 

[landtank]

sounds like a HG or possibly a cracked head. pull the spark plugs and take a look at them first.

 

[clownmidget]

Yeah Rick, I think that it is not good but I'm trying to stay optimistic since I'm in no position to go down that route where I am. This is just so damn depressing...

 

[clownmidget]

For anyone interested, we figured this out today...hole in #1 piston. will update once the head is pulled.

 

[landtank]

Yuk, good luck with this.

 

[Romer]

Mike, nice to hear your with friends.

 

[AMMO]

Ok so the moral is if ur truck was on the west coast leave it on the west coast and vise versa... It all goes back to Biggie and Poc...

Me hub separation... You... Well let's keep it real

-A

 

[MoGas]

I went over there with a few tools. We did a compression test.....~30 on #1, all the rest 125-135. Put some oil in the #1...got up to 75. Broke out the borescope and found the hole in the piston.


Dave

 

[landtank]

Mike, I'm curious as to what spark plugs are you running and how often do you change them?

 

[clownmidget]

Rick, the plugs that were in it from the previous owner BKR5EYA.

I picked up the NGK BKR6EIX iridium ones yesterday when there was actually a passing hope that we'd try and fire it up.

More ideas are: bad injector in #1 or bad O2 sensor for leaning out condition maybe specific to just #1 cylinder.

 

[Brentbba]

Damn Mike. Cruiser dejavu. Brings back horrible memories of my blown HG up in Norcal last January.

Sounds like from reading your linked thread that the AZ guys are really stepping up to help you out and that's great.

Best of luck to you. Keep us posted.

 

[OGBeno]

Mike and Ali have hit the road and are on their way back from Flagstaff to ABQ.

Truck will end up at my house and we'll go from there.

 

[landtank]

the last time I saw hole in a piston was on a carb'd Chevy with a very old set of plugs. I could be wrong but this type of damage is usually spark detonation I think.

 

[OGBeno]

Mike's at my place tonight and the truck is here too.

All is good after some pizza and beer.

A new day brings new solutions....

-o-

 

[Photoman]

Timing too far advanced will burn a hole in a piston.

Bill

 

[alia176]

Timing too far advanced will burn a hole in a piston.

Bill

What I am curious about is why did it happen so long after the Turbo installation?

 

[landtank]

I've contacted Mike and he had a Porsche shop tune the unichip for him back in CA. My concern would be what AFR they were targeting. Max HP is around 12.3 but a safer AFR is around 10.0-10.5.

He mentioned a bung that was welded to his down pipe so putting a wide band on the new engine would be a good idea to make sure everything is working in a safe manor.

 

[Photoman]

The one I jacked the timing up on was not a cruiser and was fine driving around town. Good low end torque. When I took it out and ran it hard at high rpm in hot weather, it burned a hole in number 1 piston.
Other things can contribute to detonation. In the hot weather now there is less oxygen atoms per unit of air equals leaner air. Different elevation from where the cruiser was tuned. Using regular gas or bad gas instead of premium. The EGR adds cooling gases to combustion. Sometimes several things conspire to add up to a bad result.

What I am curious about is why did it happen so long after the Turbo installation?

 

[alia176]

Ahh, got it.

We were suspecting if the #1 injector could be the culprit!

 

[informationjunky]

Ahh, got it.

We were suspecting if the #1 injector could be the culprit!

Clogged creating a lean condition?