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Discussion Starter · #1 ·
Well, this weekend was interesting. Ran 190hp to the wheels on my 95 ATX on the dyno, but also managed to spin a rod bearing (or finally get to the point where someone heard the existing spun bearings). Cylinder 6 was spun, 3 & 4 were destroyed, serious burning & copper chunking / flaking. 1 was in the same condition as 6, just not spun, and 2 & 5 were perfect. I'm on borrowed time, hoping the replacement bearings will seat well & get me some extra life out of the engine.

Oh, and my supercharged 91 SHO made 419hp to the wheels the same day too.
 

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Originally posted by FatTortoise@Apr 14 2004, 04:35 PM
The 6cyl SHOs have less than 200 HP!? Wow! Are they still faster than the Duratec?
He made 190 Horsepower at the wheels which is very good considering 20% of the horsepower is lost through the transmission. Duratec makes 200 crank horsepower, which is ~155 wheel horsepower.

Sorry to hear about your bearing man. I have heard of Duratecies with that problem, but not SHOs.
 
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...looks like I'll gear up to do the rod bearings before the 60k....

Fred, any wear on the mains, or are they not an issue we're checking into?
 

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Discussion Starter · #6 ·
Rod bearings on the SHO seem to wear about twice as fast as the main bearings. I spun 1 rod bearing (#6). #3 & #4 were in worse condition visually (severe burn marks with copper flakes / chunks removed), with the tangs flattened out, but hadn't spun under each other yet. #1 looked visually the same as #6 (flat tangs, some burn marks, etc.), but hadn't spun yet. #2 & #5 looked like normal wear, some copper showing, tangs in good shape.

I did pull 1 main bearing Bob, and it was in good shape, no copper, no burn marks, etc. For the cost of the parts, yeah, I'd do it. It's about $50 for the bearings, and figure another $50 for the RTV, front & rear oil pan seals, and the oil pump mounting kit (to get the oil pump pickup tube gasket). On your MTX, and you being the UberMechanic, figure 4 hours start to finish. On the ATX, I had a bummer of a time with the O2's & Y-pipe drop & reinstall.

The driveline losses for the MTX vs ATX SHOs are different, and the % loss is an arguable point. I like to use 15-17% for the MTX, 22-25% for the ATX.

At 22% loss, my 95's making about 244hp at the crank. At 25% losses, it's 254hp at the crank. So, given the simple bolt-ons for the ATX & the 60k I'd done recently, I'm happy to pick up the 25-35hp. Power mods, the car ran with a Ford 80mm / LPM that was new to the car for the dyno. Baseline run, I was running a C&L 73mm. I have the UDPs and a Borla Cat-Back system. My previous runs with the car, I ran 177hp with the stock setup, 174hp with the Superchip. Yeah, those numbers are correct.

I ran something like 184 with the Borla & the C&L, and crept up to 190 with the Ford 80 / LPM.


On the 91, 419hp to the wheels: about 494hp at the crank, 15% losses; 505hp at the crank at 17% losses. (insert big smile here)
 

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Damn it, that's the second time I've read about someone losing HP from a superchip. Now you have thinking that I should pull mine, but I like the way it makes my tranny shift, and I like how it removed the speed limiter. I wish I had enough $$$ for something from Apten or Americanmotorsport. Those guys actually MAKE hp with their programming.
 
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My rod bearings are getting changed out tonite on my new motor before it goes in so I won't have the same problem I did on my original 3.0L. I was thinking about replacing the mains also, is it a good idea on a 3.2 with 75K on it? or am I just wasting my money.
 

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Discussion Starter · #10 ·
If the engine's out, I'd be replacing them, but that's just me. Most people would probably tell you it's ok to leave them alone. Go with the Clevite 77 kit for the mains, it contains the new thrust spacers. Cost is about $85 from memory on the Mains set.
 
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Originally posted by Yamaha V6@Apr 15 2004, 08:37 AM
On the 91, 419hp to the wheels: about 494hp at the crank, 15% losses; 505hp at the crank at 17% losses.
Uh, I think it is you that's the UberMechanic!
Nice numbers Fred as always. BTW, I got the NESHOC newsletter yesterday, and read your article, nice work!
 
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