Killed the 5.3.... pics/video inside..
Killed the 5.3.... pics/video inside.. I put a turbo 5.3 into my 68 c10 tuned it, and drove it a while on 6 psi. A few weeks later I noticed i had a problem when the pickup backfired and bogged under a WOT run.... hooked up the wideband and was going WAY lean right befor boost...
well after chasing a fueling issue ( had a failing fuel pump that didnt seem to show any symptoms that i could tell, just replaced pumps and the lean issue went away)
When the afrs were good i decided to turn up the boost since this is just a toy
ONLY MADE 3 RUNS at 12PSI 
I guess the piston already had some damage because i left the wideband in the pickup to watch the afrs and it was spot on.... the pictures will show what i found when i tore it down tonight....
Judging by how clean and cylinder/piston/head were #7 im afraid i may have an injector problem on that cylider, intake leak, Head lifted and water in that cylinder, something.....??????????
What does everyone think? Possibly another issue??? Just afraid to put it together just to have it happen again lol
more specs on setup:
stock short 5.3
Siemens 60#
Dual in-tank walbro
227/231 614 617 112
PRC duals
4l80e
vig 3600
11.5 AFR only 12* max timing
I am in the process of throwing a piston/rod out of another 5.3 i have in the garage. along with new head gaskets, arp head bolts, arp rod bolts, and new lifters....
alot cleaner than other cylinders....
OUCH!!!!!!
Thanks in advance for your ideas and thoughts!
Just has me confused since i ran 14psi on my last motor for a LONG time with no issues.....
well after chasing a fueling issue ( had a failing fuel pump that didnt seem to show any symptoms that i could tell, just replaced pumps and the lean issue went away)
When the afrs were good i decided to turn up the boost since this is just a toy
ONLY MADE 3 RUNS at 12PSI I guess the piston already had some damage because i left the wideband in the pickup to watch the afrs and it was spot on.... the pictures will show what i found when i tore it down tonight....
Judging by how clean and cylinder/piston/head were #7 im afraid i may have an injector problem on that cylider, intake leak, Head lifted and water in that cylinder, something.....??????????
What does everyone think? Possibly another issue??? Just afraid to put it together just to have it happen again lol
more specs on setup:
stock short 5.3
Siemens 60#
Dual in-tank walbro
227/231 614 617 112
PRC duals
4l80e
vig 3600
11.5 AFR only 12* max timing
I am in the process of throwing a piston/rod out of another 5.3 i have in the garage. along with new head gaskets, arp head bolts, arp rod bolts, and new lifters....
alot cleaner than other cylinders....
OUCH!!!!!!
Thanks in advance for your ideas and thoughts!
Just has me confused since i ran 14psi on my last motor for a LONG time with no issues.....
Last edited by 1BADLS1tuner; Jan 17, 2013 at 10:16 PM.
91 Octane fuel...... working on getting a water/meth kit also befor i beat on the motor to hard again (even tho0ugh last motor lived at 14psi on 91 only for a long time)
Ya there was detonation lol...
See im thinking something fishy also because of how clean that cylinder is..... just not sure what it is...
Launching!
Joined: May 2012
Posts: 249
Likes: 0
From: North Dakota
I would bet it went lean, detonated and cracked the piston, Ive done this before on my turbo snowmobile. You will detonate from going lean just like not having enough octane. Dont ask how I know. lol
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Verdad Gallardo Thing i dont enderstand is why that piston and cylinder on that head is so darn "clean" compared to the rest of them...?
is it running really lean on that cylinder causing it to be so clean? my afr read 11.3-11.5 WOT all through boost, wich is plenty of fuel (look at rest of cylinders).....
if water was getting into that cylinder would it "wash" it cleaner like that?
is it running really lean on that cylinder causing it to be so clean? my afr read 11.3-11.5 WOT all through boost, wich is plenty of fuel (look at rest of cylinders).....
if water was getting into that cylinder would it "wash" it cleaner like that?
I just checked the ring gap... that ring was a **** to get off lol...
it was right at .014 .... what do you guys think i should gap them to on the rest of the pistons since im here anyway? .025???
it was right at .014 .... what do you guys think i should gap them to on the rest of the pistons since im here anyway? .025???
I saw an engine tear down that had coolant get in the cylinder and it was clean like that...but with signs of det, it may just be leaned out really bad for some reason. Any signs of antifreeze in the cylinder at all or any signs on the head gasket?
I think ring gap at .014 killed it. the detonation marks are there because i had that fuel pump slowly dying and didn't notice till it bogged hard. I'm sure that didn't help but was not the main cause, since the fueling issue was solved and it was running spot on till the boost was turned up.
Going to check rest of ring gaps, throw new piston/rod in, new head gaskets, arp rod bolts, arp head bolts.... Then I'll throw new plugs in, make a run and check them very close....
Going to check rest of ring gaps, throw new piston/rod in, new head gaskets, arp rod bolts, arp head bolts.... Then I'll throw new plugs in, make a run and check them very close....
This should have never happened. You got a safe timing, low boost, and cam specs seem a little to high. I always like running meth on boosted 5.3s for detonation preventions, keeps the engine running alot safer. Ring gap could have been the issue, were you running dual head springs?
This should have never happened. You got a safe timing, low boost, and cam specs seem a little to high. I always like running meth on boosted 5.3s for detonation preventions, keeps the engine running alot safer. Ring gap could have been the issue, were you running dual head springs?
Yes dual Springs