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Old 04-10-2019, 08:51 AM
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Default Cigarette Cafe Racer prop choice
Hoping for a little guidance here - thanks in advance.
1991 Cigarette Cafe Racer, Bravo 1, Currently spinning Bravo 1 4-blade 26P.
Rev limiter on new engines has been set at 5800 but I am barely seeing 5000. Depending on conditions / trim that will get me to low 70s. This is with fresh 550ci motors - dyno sheet below.
Wondering what direction to go in, if any.

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Old 04-10-2019, 09:05 AM
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Somethings seems off, at 640hp only spinning a 26p 5k..are the drives 1.5 ?
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Old 04-10-2019, 09:21 AM
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Originally Posted by F-2 Speedy
Somethings seems off, at 640hp only spinning a 26p 5k..are the drives 1.5 ?
As far as I know, yes they are 1.5
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Old 04-10-2019, 10:50 AM
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What exhaust did you have on dyno and in the boat?
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Old 04-10-2019, 10:53 AM
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You may not have enough air flow into engine bay.
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Old 04-10-2019, 10:54 AM
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You may not have enough air flow into engine bay. I had this problem last year.
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Old 04-10-2019, 11:02 AM
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Originally Posted by 14 apache
What exhaust did you have on dyno and in the boat?
CMI headers. same on Dyno and in the boat. Dry tails because we were seeing water reversion at idle.

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Old 04-10-2019, 11:03 AM
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Originally Posted by ph1971
You may not have enough air flow into engine bay. I had this problem last year.
How did you remedy the problem? Scoops on top? Ducts on the side?
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Old 04-10-2019, 11:07 AM
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Also, I should mention, it seems like the last few clicks of throttle position towards WOT do nothing to increase RPM or speed.
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Old 04-10-2019, 11:12 AM
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I opened the decorative unoperable scoops on the side of my boat. I learned this was th problem by opening the hatch a crack and then test riding.
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