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Forced Induction This section for the traditional Pontiac V8

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Old 04-12-16, 08:27AM   #1786
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Go back to the dyno. Let's see what the change did.
No comment about the video Jeff???
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Old 04-12-16, 03:00PM   #1787
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Car's looking good, the video's sounding great. Fantastic Charlie.

Mark
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Old 04-12-16, 03:27PM   #1788
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Car's looking good, the video's sounding great. Fantastic Charlie.

Mark
Thanks Mark.

Definitely sounds better then the first dyno I had a few years back...
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Old 04-12-16, 03:58PM   #1789
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Go back to the dyno. Let's see what the change did.
Guess u didn't like the video to comment??

Was curious what you thought....
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Old 04-12-16, 06:38PM   #1790
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I sent it to about 5 of my buddy's I hated it so much����
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Old 04-12-16, 08:27PM   #1791
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I sent it to about 5 of my buddy's I hated it so much����
Wow ok....
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Old 10-05-16, 12:18AM   #1792
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Cracked my crank on every rod journal.
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Old 10-05-16, 12:24AM   #1793
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This new build?
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Old 10-05-16, 03:13AM   #1794
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Yes. its the 4th one so far. Wish I had 5 grand to waste on a bullet crank. Then I could spin it to 8 grand and get all the missing power that this turbo has on tap. Guess ill have to dial it back and turn the R's down to 6 and see what it brings. Probably a big yawn and and a shaky anxious foot that only wants to be to the wood at 49 psi! hahahahaha. Oh well at least ill be able to be out cursing...
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Old 10-05-16, 03:30AM   #1795
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I'm wondering if advancing the cam shaft which brought the power band down a thou hurt this crank this time . The boost used to be all in by 5 thou with it straight up . At 4 degrees advanced its all in just after 4. I was told by my crank guy that turbo diesel motors have cracked cranks all the time because at low rpm they make tons of torque. This is a 55 year old cast crank with who knows how many heat cycle on it . I'm hitting it with 5 to 8 times its intended power so I guess it did ok for what it is. I need a v8 but I just cant kick the feeling I have for the little engine. It gets so much attention. Every where I go im having long conversations with strangers because when they find out what's under the hood they get real interested and have tons of questions.. But I need v8 turbo power for sure.. Its a shame I feel this way but the need for more power rules right now .. hahahaha
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Old 10-05-16, 03:59AM   #1796
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I was reading over at YB and one guy said a lot of the reason why people break there motors that are using turbos is because they bring all the boost in too soon at too low of an RPM. I mean I broke this crank so fast this time and the only thing I changed was the install of 4 more degrees of my cam and I did tighten up the converter too. But how low the power came in surprised me because now I had to turn the boost down because of it. It seemed to really like it but at the same time I guess it couldn't handle it.. I'm always learning something . I forgot to say that the thrust on the bearing got wiped out. After all the broken cranks and wasted rod bearing I never had this happen. Still trying to understand why this happened. I did do some weird tests like driving at 30 mph in third gear and just boost it at 35 psi to see what it did. Kind of like being on your 10 speed in 10th gear going 2 mph and trying to peddle as hard as you can. All you will do is sprain your ankle or hurt your legs because there is so much load that needs to be applied to spin those peddle fast. So I guess my motor was feeling something like that and may be the crank suffered from it , because when I tell you all it did was spin the tires and hit the rev limiter instantly at the same time it did. I know you're going to say if it spun it had no load but it takes a lot to spin those Mickey pros with a 355 gear ratio in third.. Any way im a dumb F^^&^ and now im paying for ! But I did have fun doing it!! lol!! Have a good one boys!!
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Old 10-05-16, 01:50PM   #1797
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I think you already answered your own question.

Think about it like this, your on your 10 speed your in first gear you force as much power as you can on the pedal and it transfers that torque to the wheel due to gear multiplication and the wheel spins. ( why turbos are effective with too steep of gearing not enough loading )

Do the same thing in tenth gear, it just can't possibly break that tire loose so the power has no where to go and it's got to go somewhere, the weakest link goes, and you break the pedal off. You broke your pedal off.

Your leg is the con rod and your cranks rod journal is the pedal.
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Old 10-05-16, 02:13PM   #1798
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As for the bringing it in too low of rpm question it does mean the crank would have to accelerate quicker, but I'm not buying it. The crank is already turning its not like it's at a stand still, bringing in the boost down low shouldn't make that much difference. Yes it puts more load on the crank and bearing caps than up higher in the rom but how much more?


It's the third gear roll loaded down low that's likely doing the damage. You can damage a naturally aspirated low HP engine loading it too hard on the wrong gear. That's why we have gears.

Too much advance would start to push the piston down at the top of the crank cycle where there's not much angle in the journal to crank centerline too it's like pushing the end of the breaker bar like a pool cue. That would be my bigger concern. Everything is all lined up in a row. Couple that with being in third gear and crack bang there goes a crank shaft.
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Old 10-05-16, 04:17PM   #1799
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What do you think wasted the thrust bearing? nothing looks wrong with converter and the back of the crank indicating contact between the two...
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Old 10-05-16, 04:19PM   #1800
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I'd typically say you ballooned the converter but if it looks ok then idk I'll have to think about that one.
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