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Old 03-21-2013, 09:56 AM
PT 1999 ProStar's Avatar
PT 1999 ProStar PT 1999 ProStar is offline
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"True HP"

Hello All - during my new boat search I was trying to decide between the Imor 5.7 or 6.0 and a well respected MasterCraft dealer (by most of us on ths forum) sent this email below regarding an independent study on "true HP" for the top 3 motor companies. (see the attachement) I found it very interesting and if this is something you've already seen sorry for the re-post!
ENJOY:

Hey Paul

Most Manufacturers overstate their HP dramatically, as you can see below from the CARB testing the true HP of each engine. That PCM your buddy has is really only 360HP, not 409 as they advertise. The horsepower of the Ilmor 5.7 is 320 vs 277 in PCM. All of our staff can see a dramatic difference in the performance of the ilmor vs indmar. Unfortunately, we are usually focuses on torque with extra ballast, not top end.

One of my employees is a big barefooter, and I was asking him about it. He said that with your size the Illmor would be really close to getting your 44MPH, but couldn’t guarantee it. He did mention that all footers are using the 5.7 and he doesn’t even know anyone with 6.0 Ilmor in MC. He said some will get the tower also, which helps with the start and reduces drag at top end, because it is pulling up. I checked with my rep and he said everyone he knows foots with 5.7 in Ilmor.
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File Type: pdf 2013 Engine HP ratings.pdf (154.0 KB, 442 views)
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Old 03-21-2013, 10:01 AM
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Theclarks1111 Theclarks1111 is offline
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That is interesting. So the Indmar MCX that many of us have is only 308 HP, not 350 HP?
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Old 03-21-2013, 10:11 AM
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PT 1999 ProStar PT 1999 ProStar is offline
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I guess so clark?? Here is the full attachment with website that didn't fully download on my first email.
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File Type: pdf 2013 Engine HP ratings.pdf (162.6 KB, 787 views)
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Old 03-21-2013, 10:18 AM
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Interesting. In the somewhat distant past, PCM has been known to understate hp, but not by much.

The 308 hp on the MCX is right in line with what I was told by another MC dealer about 5 or 6 years ago.
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Old 03-21-2013, 10:21 AM
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Theclarks1111 Theclarks1111 is offline
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That's interesting stuff, I didn't think they would inflate the ratings by as much as 40 or 50 HP
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Old 03-21-2013, 10:24 AM
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Quote:
Originally Posted by Theclarks1111 View Post
That's interesting stuff, I didn't think they would inflate the ratings by as much as 40 or 50 HP
Lots of things can affect a dyno. All I know is that this number was without the exhaust tips. No other info specific to the testing other than that. Take it for what it's worth. If you or anyone else has a lot of in depth knowledge of how these things work and how numbers can change based on tiny condition changes, you may be able to make yourself feel more or less comfortable with that figure.

I have seen dyno figures from older PCM GT-40 figures come out around 311 or 312. They are rated at 310.

A lot of this drop off might be due to the mandatory cats put on the boats in around 06 or so. But that's just speculation.
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Red 1998 Closed Bow Ski Boat, Ford 351, 310 hp, Acme 4 blade, Perfect Pass SG.

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To me, this forum is about love of inboard boats. It is about the sharing of information and, on a good day, some humor. It is not about post count, brand of boat, or any other superfluous labels that lend themselves to a false sense of superiority. Please, respect one another, try to pass on accurate information, and keep your eye on the ball.
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Old 03-21-2013, 10:25 AM
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PT 1999 ProStar PT 1999 ProStar is offline
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Quote:
Originally Posted by Theclarks1111 View Post
That's interesting stuff, I didn't think they would inflate the ratings by as much as 40 or 50 HP
It's all one big "gray area". I had another guy tell me that Ilmor actually has a higher HP than what they published. He said the reason is because if the true HP was stated then insuring the boats would be very difficult.......Who knows???
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Old 03-21-2013, 10:35 AM
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Theclarks1111 Theclarks1111 is offline
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Well I guess if I'm actually at 308 HP, I'm over it! I am plenty happy with the MCX, even with 2500 lbs of ballast, it still performs very well.

I enjoyed seeing that information though...
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Old 03-21-2013, 10:39 AM
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east tx skier east tx skier is offline
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Quote:
Originally Posted by PT 1999 ProStar View Post
It's all one big "gray area". I had another guy tell me that Ilmor actually has a higher HP than what they published. He said the reason is because if the true HP was stated then insuring the boats would be very difficult.......Who knows???
My Allstate agent keeps offering to insure my boat. I keep reminding her that we tried that 10 years ago and that their stated HP to length formula makes it impossible.
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Previous: 1993 Prostar 205

Red 1998 Closed Bow Ski Boat, Ford 351, 310 hp, Acme 4 blade, Perfect Pass SG.

FAQ


Tyler Ski Club


To me, this forum is about love of inboard boats. It is about the sharing of information and, on a good day, some humor. It is not about post count, brand of boat, or any other superfluous labels that lend themselves to a false sense of superiority. Please, respect one another, try to pass on accurate information, and keep your eye on the ball.
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Old 03-21-2013, 10:42 AM
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PT 1999 ProStar PT 1999 ProStar is offline
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Quote:
Originally Posted by east tx skier View Post
My Allstate agent keeps offering to insure my boat. I keep reminding her that we tried that 10 years ago and that their stated HP to length formula makes it impossible.
This year was the first time AMICA agreed to insure my boat. The new one with a 6.0L go figure!!
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