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Nothing to hide - Ilmor opens the door on my 725/Indy buildup

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Old 09-16-2010, 03:30 PM
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Hering cut my 16.5" prop down to 15.75" and reduced the cup near the hub for less stern lift. The boat feels better and runs freerer, but we still have more to go. With four people onboard, it ran over 90 with ease at last weekend's NJPPC Blackjack Run (a highly recommended event, by the way), but the nose is still being pushed down too much. I need to do some calm water testing with 0", 1" and 2" spacers and weight distribution changes in order to figure out what our next step is going to be.

NASCAT's prop testing party starts tomorrow, I believe...
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Old 09-16-2010, 03:34 PM
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Prop, drive spacer & ballast test tomorrow on LKN w/ racer Ben Robertson.
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Old 09-16-2010, 07:30 PM
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Ben Rocks! ... at boat setup

Fun to ride dirt bikes with also.

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Old 10-29-2010, 04:05 PM
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Testing tomorrow at the local lake; Hering rounded the ears off of the prop for more bow lift, which seemed to help when we ran last weekend, and Ilmor has loaned me a development nose cone. Watch this space...
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Old 10-29-2010, 04:49 PM
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Quote:
Originally Posted by C_Spray View Post
Testing tomorrow at the local lake; Hering rounded the ears off of the prop for more bow lift, which seemed to help when we ran last weekend, and Ilmor has loaned me a development nose cone. Watch this space...
Obviously they had more than the set I tested!!

Keep me posted on your progress, hope you get the results you've been looking for!

Peter swears that the reduced diameter will help my hop, maybe your chine walk too!
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Old 10-29-2010, 05:04 PM
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Good luck Chuck!
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Old 11-01-2010, 07:53 AM
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Quote:
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Obviously they had more than the set I tested!!...Peter swears that the reduced diameter will help my hop, maybe your chine walk too!
Actually....

>That IS one of the nosecones that you tested!

>I'm not fighting chine walk, it's been a combination of too much pitch and a hop from too much transom lift.

Anyway, I didn't get the test done this weekend due to a pulled back muscle. Hopefully, I'll get it done on 11/6...
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Old 11-02-2010, 09:44 AM
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Quote:
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Actually....

>That IS one of the nosecones that you tested!

>I'm not fighting chine walk, it's been a combination of too much pitch and a hop from too much transom lift.

Anyway, I didn't get the test doen this weekend due to a pulled back muscle. Hopefully, I'll get it done on 11/6...
No excuses, just results..........
Kidding, hope all is well Chuck
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Old 11-02-2010, 11:02 AM
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Chuck,

Great thread. It's been fun watching the progress and evolution of your boat over the years... it's a true work of art!

BTW, I have a couple of Vipers and I can tell you once you get a taste of what that engine will do and how happy it is with some boost, you're going to be swapping pistons and retesting props!
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Old 11-07-2010, 09:15 PM
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Special thanks to JRapp, Noise Pollution, Jet Mech and 292Fastech07 for pitching in and making all the testing and changes go so smoothly. (So this is what it's like having a pit crew....) The GoPro video camera worked every run, but there is still so much spray from the exhausts that it's hard to tell much. I'm going to need a different rig to get the camera even lower.

Although it was a bit choppy to tell if there were any further improvements in the now-diminished hopping issues, there is no doubt that we are getting closer to "the setup". Although I couldn't feel any change with the new nosecone, taking the spacer out was worth about 7 or 8 mph. I was stuck in the high 70's back in June for JOTJ and now the boat consistently runs to 100 (and over) at will, with a best of 103+, and easily cruises in the mid-80's. The mid-range acceleration is back, too!

Ultimately, it still needs less pitch, as there is far less slip that we expected. I'll have to wait to review JRapps videos of the dash, but the best I recall was 103 mph at 5600, where I'm still giving up about 80 or 90 horsepower. I'm not sure if it will ever run the 112 that I had hoped, but I'm sure that we can get to 108+ with an inch or two less pitch. That'll work for 725 flywheel horspower in a 28' boat. I'll have to settle for 103 this year...

Thanks again, guys!
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