Merc CNC 5 blade cleaver and 400R

[Toffen]

Hey,

I hope all are well

I managed 89 mph this summer with my Phantom 25 1984 model. 400R. 7,060 rpms. This with all vent hulls open. We will close them to see if we can get the slip down fx 1% and get 90 mph.

I am hitting the rev limiter, and consider to by a 5 blade 26/27 CNC cleaver from Mercury. I read that a Bullet with a 300R managed 107 mph with a CNC and 103 with the Max5.

The issue is that I have to buy to try... So the question is if the CNC can do the trick.

Cheers, Toffen

[Toffen]

Received this from Merc Racing today:

Toffen,


Always happy to answer your questions, it sounds like your Phantom is getting dialed in! At 89 mph you are getting a very impressive 6.8% slip. The Max5 and the CNC do run equal in terms of pitch, so I think you are right in considering a 26 pitch CNC to get you off of the rev limiter. If you can swing the 26 up to 7000 rpm, you will see around 94 mph, thanks to the CNC having about 4.5% slip. If the 26 drops you down to 6900 rpm, expect to be going 92 mph. As for rake, it is a bit tricky. We have had some luck with V-bottoms running 15 degree rake to keep the ride flat at top speeds, but I can’t say for sure with your set up. Thank you for the great information!


Nick

[Toffen]

Hi!

Reveived this from Merc today.

Toffen,


Always happy to answer your questions, it sounds like your Phantom is getting dialed in! At 89 mph you are getting a very impressive 6.8% slip. The Max5 and the CNC do run equal in terms of pitch, so I think you are right in considering a 26 pitch CNC to get you off of the rev limiter. If you can swing the 26 up to 7000 rpm, you will see around 94 mph, thanks to the CNC having about 4.5% slip. If the 26 drops you down to 6900 rpm, expect to be going 92 mph. As for rake, it is a bit tricky. We have had some luck with V-bottoms running 15 degree rake to keep the ride flat at top speeds, but I can’t say for sure with your set up. Thank you for the great information!


Nick

[kct11]

Toffen on the bullet was the pitch the same? For some reason I thought his max 5 was a 31 and the cnc cleaver a 34. I could have internet **** I read crossed up tho.

Not a effort to downplay his number, just to consider it could have been the pitch change helping out too.

[Toffen]

Hi!

I think it was 1 pitch bigger ..

I spoke to people from NorTech. They picked up 4 mph with a 18 degree 26 CNC over a Max5 26. So something is there

But the question is if USD 5,000 plus 25% vat is worth the mph ...

Cheeers, Toffen