That soldier did well! 30 psi on a sbe and a good amount of street miles and passes is nothing to belittle!
On the 'mildly' Cheap SS Monte Carlo chasing a 9.0____(oil pan woes)
- Thread starter 64nailhead
- Start date
Every year people seem to find an extra 25+ hp safely out of a SBE.
It's just been a number of 25+ hp/yr years
It's just been a number of 25+ hp/yr years
Holdener made 1400 or something out of a SBE 4.8 on the Dyno, his gen 4 6.0 maxed out a 3 bar MAP sensor at like 1500hp.
The SBE record last year is pretty crazy.
www.lsxmag.com
Untouched 4.8, ported 862 heads, 88mm GT55, 16 injectors on Meth.... Sounds like a good combo.
The SBE record last year is pretty crazy.
Squirrel Tuned Sets New 4.8-Liter Stock Bottom End LS Record
The stock bottom end 4.8-liter LS record falls again! We take a look at Jack Roberts' new car and engine combination.
www.lsxmag.com
Untouched 4.8, ported 862 heads, 88mm GT55, 16 injectors on Meth.... Sounds like a good combo.
It's in the tune, and that's no kidding. Happel, Sloppy Mechanic guy, has gotten a gen3 to 800whp, but it takes a ton of boost, E85 and timing in the toilet.
What Jake and Duke referenced above is a fact. That sqirreltuned guy is making stupid track times on a 4.8 with stock rods IMHO.
There is an excellent chance that the issue with my motor presently is me, or something that I started previously. Knocking the headgaskets out of it before DW had me concerned that I might have started the demise of this motor. But perhaps 12 degrees of timing at 7100 rpms and 32psi of boost was a little too greedy. I don't know, but we'll see in the next day haha.
I'm Gen4 with an aluminum block. The aluminum block is weaker than the steel block and that's a definite/previously determined/absolute. But I'm nowhere near the limit of the aluminum block - yet.
Something to keep in mind though, a bad tune will break anything. I could have a Dart, World, LSX , etc block with $3K of rods and pistons and break them with a tuning mistake. They are just a bunch more forgiving to the tune. What ends up happenning with better parts is they start getting leaned on harder - they all have a limit. For some fun YouTubing, go watch Steve Morris's shenanigans from this past summer. He certainly knows how to find the limit of some of the most expensive parts available haha.
8-10psi or 100 shot of nitrous can be handled by almost every motor made in the past 30 years, but a bad tune with either of those low power adder numbers can turn anything into smithereens.
So….I guess I found the limit of ARP head bolts.
I didn’t bother checking piston height until the motor was out. And I new it was going to be a scene after checking. The forward side of #1 was .105” down and the rear side .065”. And after finding the next two in the driver side below the deck I knew what was in for. I have one straight rod, and that’s from the hole with almost 160 psi of compression.
So I was very anxious to see the ring lands and the bearings to see if I got too aggressive with the tune. Bearings, rings, ring lands are still in great shape. The head gasket at #1 - not so much. And I can see at least 3 other cylinders that had started to spit the bit.
So I guess I found the limit of ARP bolts. I’m sure I lifted the heads with virtually new LS9 HG’s. 32psi of boost from an 88mm turbo seemed to have made me join the bent rod club. $1500 or so of pistons, rods, rings and head studs - here I come.
I’m going to have to take my 10G’s and the keys decal off the car . And I’m going to have to start a new thread haha - no more on the cheap I guess.
Edit : guess what what studs I'm getting :
I didn’t bother checking piston height until the motor was out. And I new it was going to be a scene after checking. The forward side of #1 was .105” down and the rear side .065”. And after finding the next two in the driver side below the deck I knew what was in for. I have one straight rod, and that’s from the hole with almost 160 psi of compression.
So I was very anxious to see the ring lands and the bearings to see if I got too aggressive with the tune. Bearings, rings, ring lands are still in great shape. The head gasket at #1 - not so much. And I can see at least 3 other cylinders that had started to spit the bit.
So I guess I found the limit of ARP bolts. I’m sure I lifted the heads with virtually new LS9 HG’s. 32psi of boost from an 88mm turbo seemed to have made me join the bent rod club. $1500 or so of pistons, rods, rings and head studs - here I come.
I’m going to have to take my 10G’s and the keys decal off the car . And I’m going to have to start a new thread haha - no more on the cheap I guess.
Edit : guess what what studs I'm getting :
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Since they rocked like that, are the cylinders OK or do you need to punch it out?
Those rods aren't bent enough to make pistons contact the crank.
The ol 5.3 right now.....
The ol 5.3 right now.....
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