Also, there not all going turbo. There's also a reason why many OEM's are actually going away from turbo. Many have exhausted there efforts to get the low end drive-ability you get from a PD style SC. Where are all those OEM centrifugal applications? In 5-10 years, there will be almost a 50/50 mix of new vehicles using PD sc's vs turbo's.
Heads are also not exotic, there very nice big chief style heads and a reasonable camshaft. I'm just not posting that info. Will the motor make over 2000hp? Yup, sure will, since it only took 15psi and Merc's race setup and others are running over 20psi to get near 2000 HP level.
I've never said turbo's won't make more power, thats never been the argument, but centrifugals, sorry, rather have the turbo's.
Furthermore, how many water cooled housings are out there that can produce 2000hp? How's the low end torque on those?
My only question: How long will it live? Obviously, a lot of that depends on the operator. (The are other throttle positions than wide open, right?)
What kind of service intervals are you looking at?
Sorry is that already been asked.
2. Sorta, a different style big chief but only on pump gas. Running in 3 weeks on Dart 380 Pro 2's.
3. Your correct on the volume, but because of size/weight, the 8.3L is limited in RPM to normally 11,000 where the 4.0's can turn up to 18,000.
4. Don't know engine life yet, it will be run at 11psi for poker runs and therefore I feel confident the valve train will be good for 75hrs of normal boating. Lower end will not have an issue.
5. 16-rib wasn't surviving because of the weight of the weight of the belt and centrifugal forces. 12-rib worked but slipped under accel/decel. We also had some issues with how we made the guards to close to the edge, which caused some issues. Once we got it all figured out, it did work, but we decided it was easier to go with 8mm. Quads are taking less hp to operate at this power level, and are working just fine with 12-rib.
Trust me, I know what you mean about the 8.3 vs quad, but I will not even sell the 4.0L quad for below 1350hp, the 8.3L still works best in this area. We did make a new TB setup for the quad, which will make it easier to work with in the future, but did not run them on this engine. At this power level, they will be worth 50hp if my calculations are correct.
Forget the turbo, blower/supercharger/ whipple Psi whatever
JUST PUSH THE DAM BUTTON
How is that for a boat motor!
Thank you for your prompt reply. This has been a very informative thread with great questions from everyone and candid to the point answers on your part.
Lastly, given the power output for this motor [which is a bargain in terms of price] what drive will deliver the power to the water. It does you no good to have power if it cannot be transferred to the water without breaking.
Can you comment on this topic? It would definitely complete the entire package for me to know what drive to put on this power plant. As this would be a frequently asked question if not the second question in the equation.
Thanks again, and this is great stuff/useful info.
I wasn't going to comment on this thread, because the choice of supercharger argument has been done many times on OSO. But I would like to say that the rumors of my disappearance are greatly exaggerated!
Since I'm here, I have to say that the problem is not which supercharger to use to make 1800 HP. The problem is how to keep the engine together at 1500 HP. I was told this years ago by a respected engine builder, but I didn't appreciate the fact until we spent a lot more time and money on the twin blower system. Then the light bulb went on. You just can't keep pushing more and more HP out of the same eight holes. Eventually you run into four major obstacles:
too much valve lift
too much piston speed
too much boost pressure, heat, drive loss etc.
too much cylinder pressure
As a result of this "revelation", we started working on our own engine program. This, of course, turned out to be a huge job and that's why you haven't heard from us for a while.
And although I don't post much anymore, I do enjoy poking my head up once in a whle to see what's happening on OSO.
Last edited by tomcat; 09-24-2010 at 05:47 PM. Reason: too long
what would an e-85 tune up do? i am having a small engine built now and my engine builder has convinced me to tune it on e-85....I finally concluded with the extra hp gained that keeping a barrel around was no harder than a barrel of c-16???? great job on the motors
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