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JFK78
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Posts: 17
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« Reply #63 on: July 22, 2009, 10:48:18 PM » |
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Do you have any daughters? I think I love you. Those are some........numbers for a d series.
Yes, I do. But she is definitely off limits to anybody on this site, ever! It just needs that MF D dog box, or a D - B adapter, and the turbo setup off your sfwd car.
Regardless in for times.
Maybe next year.......haha Hope to have some better times up soon, in the next week or two. Its about time you made it   Thanks for the invite! |
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JFK78
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« Reply #64 on: July 25, 2009, 09:28:17 PM » |
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Well, bad news. The motor is done. One of the pistons decided to leave the building. No abnormal combustion or anything like that, all cylinders and plugs are/were perfect until this pass. #4 piston just came apart at only 23-24psi at the track. The wristpin beating around in there cut grooves all down the cylinder and cracked the sleeve at all 4 contact points. We either found the limits and pushed them too far, or it was a freak incident that 1 piston fell apart. Here's what we found when we pulled the head:   On a good note, it stayed together long enough for me to get my NHRA competition license! |
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JFK78
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Posts: 17
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« Reply #66 on: July 25, 2009, 10:34:58 PM » |
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We can probably fix this head. Now that it's off the car, we can have it digitized and offer a great, proven Y8 head port job. I already have another Z6 head being ported right now though. I don't think we are going to do another vitara build for my car though. It's time to step up to sleeved/forged for reliable power now and not having to worry about running it at 600+whp. We were going to go that route at first, but decided to try it with the vitaras instead. We pushed the stock sleeve/vitara build to and way beyond all established limits and figured out how to build a good D16 combo that works well and makes great power, but at this point I would say that it's just not reliable enough for what we want to accomplish with the car. We don't want to do this again in 1-2 months, and I'm not stuck on the whole vitara thing. I had my fun with them, and they are still by far the way to go for anybody wanting a 300-500whp range street/strip car. I just want to go 9's reliably with a street legal/streetable D16 w/out wheelie bars. It's a great goal to work towards. Up to ~500whp and 9000rpm is fine, but I think that 9500rpm and mid 500's-up is not reliable enough. I don't doubt that we could build another identical block and have it hold up fine, but the chances of failure are still to high for a reliable racecar. We are sending out a block to Golden Eagle ASAP.  |
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JFK78
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Posts: 17
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« Reply #76 on: July 27, 2009, 09:53:07 PM » |
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Thanks all.
Total on this motor was ~40-50 dyno pulls, ~100 street miles, and 12 passes at the track.
I think it was a casting/metallurgy flaw, or #4 was simply the weakest of the bunch and failed first. Either the skirt developed a crack and then it fell apart, or the pin boss area wasn't strong enough and the piston came apart there, detaching itself from the rod. We heard it rattling after the burnout right before the last pass, but I ran it anyway and shouldn't have. It would've saved a lot of damage.
I'm guessing that the high rpm was the killer. We had the rev limiter at 9600rpm. Last years build never saw over 9100rpm, and lasted forever.
We knew what we were getting into by pushing things this far, I just didn't expect it to let go this soon. But we learned a lot and everyone can benefit from it.
It would have been really cool to get a few passes in at high boost with the new slicks and tranny before she let go though!
The 6 passes to license were nothing spectacular. I just wanted to get the licensing passes done before really pushing it, so all these runs were on only 23-24psi of boost with super worn out slicks (almost 60 passes on them), and normal lift shifting. Conservative passes if you will. We have new slicks to put on the car too!
All runs were 1.6 60's, first 3 were partial runs.
Run 4 also a partial run, 10.66 @ 118mph.
Run 5 was 10.5 @ 138mph, banging off limiter all through 1st and 2nd, short shifting 3rd at 8900rpm.
Run 6 was the quickest run yet but then I missed 3rd gear and went 11.0 @ 130mph.
They still gave me my license though because the missed gear was the only reason for the low mph, and they have seen the car trap over 135mph several times before.
Basically, the car would've went ~10.4 @ 140mph @ 23-24psi had it not come apart.
I'm still halfway tempted to just throw another vitara block together to run (w/a lower revlimit) while we are building the sleeved block.
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