Merc 600 faster than a Ilmor 710??

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07-26-2011 | 06:40 PM

#31

C_Spray

Diamond Member #001

Joined: Oct 2000

Posts: 4,808

Likes: 5

From: Coastal North Carolina

Quote:

Originally Posted by relaxalot

I would think that the 710 would be faster than the 600 if they both were stock. If the Merc has been reflashed with a different pulley then it should run away from the Ilmor...

+1. Gets my vote here.

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Retired! Boating full-time now.

07-26-2011 | 08:23 PM

#32

vtown

Thread Starter

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Joined: Sep 2007

Posts: 82

Likes: 1

yes the problem seems to be the setup.

I think the problem is bow lift with these deck boats. relaxalot and others say that the P5X is the best running prop. From what I understand P5X is a bow lifting prop with a little extra transom lift due to the 5 blade.

The ilmor boats don't respond the same to the p5x.

Would higher prop rpm and lighter engine cause the transom to lift more making an even bigger problem with bow lift?

What can be changed with the bravo prop to decrease transom lift?

07-26-2011 | 08:44 PM

#33

Speed H2O

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Joined: Nov 2002

Posts: 102

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From: Panther Ridge Florida

Quote:

Originally Posted by IlmorDonzi

When did you do the test at Donzi with the Ilmor?

What boat or boats were used in the test?

What drives were used in the test?

Thanks.

In 2006 and 2007
The 38 ZR and 43 ZR
Bravo XR's, Imco's and no.6's
I bet you allready knew that Dolph

Last edited by Speed H2O; 07-28-2011 at 09:45 AM.

08-07-2011 | 10:07 AM

#34

Steet

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Joined: Oct 2001

Posts: 721

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From: Lake Norman, N.C.

I think one problem with the setup is the difference in the engine weight in the back of the boat. It should slip more with an Ilmor. When big blocks were removed from my velocity and Ilmors installed the boat was sitting about
2" higher out of the water. The major difference between the
merc's 600's or the 700's is the Ilmor has an advantage of about 30 to 35% better fuel economy.