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Too much prop slip 28 Heat

Old 06-24-2020, 06:15 PM
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Here is our new motor. Installing it next week.
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Old 06-25-2020, 04:22 AM
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Originally Posted by wa4stroker View Post
You're thinking of adding the spacer to drop the prop shaft down so the centerline of the shaft is parallel with the bottom?
the prop shaft on mine is 2” below the bottom of the boat now, but it was more like 4” with my XR before switching to an Imco SCX. I think lowering the drive into the water more would fix the walk/chiming. I talked to Brett from Bblades and am sending the p28 Maximus to be labbed. He says they can get my slip numbers down from 17.7% with the lab. then we should look at drive spacers to get it dialed in to 10ish% slip range which should have me in the mid 80s hopefully with less walking. I will be completely happy with a 85+ mph open bow heat.
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Old 06-25-2020, 10:35 AM
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Originally Posted by Darbs View Post
the prop shaft on mine is 2” below the bottom of the boat now, but it was more like 4” with my XR before switching to an Imco SCX. I think lowering the drive into the water more would fix the walk/chiming. I talked to Brett from Bblades and am sending the p28 Maximus to be labbed. He says they can get my slip numbers down from 17.7% with the lab. then we should look at drive spacers to get it dialed in to 10ish% slip range which should have me in the mid 80s hopefully with less walking. I will be completely happy with a 85+ mph open bow heat.


what power do you have?
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Old 06-26-2020, 07:15 AM
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Originally Posted by Cerberus66 View Post
what power do you have?
I don’t have a dyno but I gotta be 750-800
punched 502 to a 509. 8.5:1 comp, dart pro 1 heads
custom cam, 2.3l whipple @ 9 psi. Cmi headers, All aeromotive pumps and fuel coolers
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Old 06-29-2020, 04:10 PM
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The experimentation done years ago by fellow Nordic owners showed us that 4.5" below the keel on a stepped hull Heat was the sweet spot for the best speed and handling. A 1" spacer on my Bravo drive achieved the 4.5" for me on my 2004 Heat, and I noticed an improvement. I especially noticed a reduction in the cavitation coming onto plane (I was running a labbed Bravo One 4 blade at the time) I don't know that this information applies the same to an Imco drive.
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Old 06-29-2020, 05:13 PM
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Originally Posted by 87MirageIntruder View Post
The experimentation done years ago by fellow Nordic owners showed us that 4.5" below the keel on a stepped hull Heat was the sweet spot for the best speed and handling. A 1" spacer on my Bravo drive achieved the 4.5" for me on my 2004 Heat, and I noticed an improvement. I especially noticed a reduction in the cavitation coming onto plane (I was running a labbed Bravo One 4 blade at the time) I don't know that this information applies the same to an Imco drive.
the Imco is two inches shorter than the XR that came off the boat and sits a perfect 2 inches from the keel on my heat. The biggest spacer Imco makes is 2” and could get me to 4.
I’m going to see what labbing my maximus p28 does for my slip of 17.7% then consider a spacer. One step at a time
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