Ok, you are clear, but there are some untrustworthy people out there (whoever you purchased the drives from). Let the buyer beware! I guess the indicator to us, should have been the paint on a Dry Sump Six lower. It's behind us now, there is a new lower on it.

The drives were on the boat when I purchased it and I had no reason to believe the skegs had ever been welded.

You and your family have always been stand up people and I have heard many stories (from jack) about how you never cut corners and always do things right. I have to imagine this is just a sad case where something was hidden prior to you or ZP getting the drives and eventually the issue came to light is all.

Sooooo, we ran 5 sets of props including 6 blades, the best all around are the 5 blade, 17. 5 X 34 x15 r. But it won't turn them high enough. What to do? Oh of course, remove the 871s, add new whipple 510r screw chargers. The engines already have Whipple MOAC inter cooler manifolds. So that is in the works now, waiting on Dustin. See you in Key West...

AN IDEA !

Maybe keep the props that are the closest to working for you and send them to BRETT from BBLADES? He can fine tune them to get you to where you need to be.

That's a terrible idea. They have it right. Props aren't too big, engines are too small. Love it!

Hell yea

I agree it makes perfect sense. You already have the props that work pretty good. You can't adjust them yourself, and shipping would be crazy for 2 props all the way to Michigan. The obvious choice is go the do it yourself route and upgrade the power plant. 2 Whipple's is about the same cost as the shipping!

The Whipple's will be night and day better than the old roots setup. Especially if you go EFI. Other than price point I have no idea why anyone would build new engines with roots blowers and carb anymore.

ZP and MRP

Save the old parts as I am working on a Café that will need a few upgrades! Film at 11.

I'll save you my parts :boat:

I bought some intakes and carbs from Adam a few years ago and they were as described when they arrived. Have been on my motors for 3 years with zero issues. I know not related to drives but do not think he one of the guys out there over to screw anyone intentionally. Sometimes bad chit just happens and this time you are on the wrong end.

Would be very informative to see the intake temp differences between the roots and the Whipple.
Don`t have intake temps gauges do you? I wanna know if the hype is true with the Whipple.

No there are no intake temp gauges. Supposedly the 510r set will ship Wednesday.

I know the whipples and psi blowers take a lot less power to turn when talking 35-40lbs of boost.I think the margin becomes smaller though, at low boost levels, say 6-10psi. At 40psi and high overdrives, the difference in parastic loss can be in the hundreds. Most classes outlawed screws because of that.

As for "why anyone would build an engine with a roots" today, my guess, is cost vs horsepower. Lots of 1200+hp roots blown pump gas engines out there. If it meets the goal, it meets the goal.

A buddy of icdedppl's and mine, built a 10-71 setup, making 1036HP on pump gas with a 522ci, making 1.98HP per ci, with 10lbs of boost (with a pretty cool intake temp). Other buddy, built a 8.3L whipple blown, pump gas 588, that made 1200hp, 2.04HP per ci with 12 or 13lbs of boost. The combination of parts under the blower, helps things as well.

Typically though, I've seen a few guys claim at the 1000ish hp range, pick up around 100hp from swapping from a roots, to a big screw, with similar boost. My guess is from the lower parasitic loss of the screw.

On a roots type blower there is friction of the rotors that makes the seal. There is no contact with a screw blower so it takes less power to turn and creates less heat to compress the air. I've run PSI set up with 8:1 compression and 10lbs boost with no intercooler with no issues. Dustin will tell you that same thing with a Whipple at less than 12lbs boost.

Cannot wait to see the results of the 510r on your set-up.

First Gun,
I will take what I can get. It is somewhat of a longshot to get the boat, but will just have to wait it out.

ZP,
You guys will be burning the midnight oil getting ready for KW. A little birdie told me about your swap
deal! Another small project for you when you get back!

??? Same thing what?

Any updates??

On a temporary break..........playing in the Keys :boat::ernaehrung004::boat::party-smiley-020:

Oghhh, new Chief 1150, whipple 8.3 liter blower, 588 ci, motors now, into the boat they go. The dang props were to big, so this was the answer...

Sweet!!!! You guys don't quit. I like it

That thing outa really make some noise now. Not like it didn't before.

Mark

It's very tight in there, the new coolers are longer, rear Eng alternator just does clear.

Looks amazing. Awesome boat. Looking forward to a running vid....

Zero, Can you PM me the approx. cost of the whipple package? (2x blowers, inter-coolers, pulleys)

Also; what size blowers did you have before, and what carbs were you running? Is this tuned for 93 octane?

"It's very tight in there..."
ZP, as usual is being too modest. With the new more efficient coolers, the port engine hit the sea strainer and could not be lowered into position. Soooo, he removed the strainer, cut the bracket apart, fabricated a new bracket, re-welded it and had it back in the boat in about 30 minutes!!
Both engines are in now and we are about to re-install the exhaust. Should have test results soon. [ATTACH=CONFIG]552118[/ATTACH]

Nice project

Can't wait to see it in May, nice work.

As if that boat couldn't get any better, you do this and just drop jaws.

well done guys!

Dogs are in awe, they haven't seen this run in a while, headed to the ramp with it.

the 8.3 is a monsta

Ran great, bad conditions, windy 15-20, choppy 2-3 feet, visibility about a mile... Oh wait we were in the Cig, no problem..

Chief really built some power into it . The whipple 8.3s are bad ass, it easily pulls the 17.5 x 34 5 blade merc cleavers now to 55-5600. Ran upper 90s easily, to rough to hang it out.check out the t shirt

That's sweet, and now I really have regrets not buying whipples. About how much power do you think you are making with the upgrades? Oh, and do you intend to run 5 blades over 4 blades, and if so, where are the advantages?

Nice job you guys are doing !

Curious, what RPM did you turn the 34's to with the old setup, and how much boost?

How much boost with the new setup?

It would only turn about 4800 with the new props, that was the reason for the upgrades. That was at 6 pounds of boost. The whipples make boost much sooner. And about 3 psi more so far. I will let the owner tell what the results are. They are dramatically greater. The boat is now fun to run. See you in LOTO for the reunion.

Would be interesting to see a comparison 6psi roots vs. 6psi Whipple.

3 psi is about 100hp so the rpm change makes sense. Didn`t try to run 9psi with the Roots?

What's the fastest straight bottom gun out there?

Congrats those brand new Chief engines are badass!! You guys dont mess around, went to Key West with the old engines and now have New Chief 1200's built, installed and running by March!!!