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Mach 22 I/0 anybody run a 1 or 2" shorty?? mine is stock nose cone and 500HP

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Old 06-02-2015, 02:40 PM
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Question Mach 22 I/0 anybody run a 1 or 2" shorty?? mine is stock nose cone and 500HP

So far the set up gets me 89 MPH with a 30" bravo.

What can I get out of this boat speed wise? Have not had a chance to run a 32 lab, I think that will work.

But before I try that, wondering what the drive height should be at?

Anyone run a 1" or 2" shorty?

The previous owner said he tried a 2" shortly, but the boat felt like it was sliding sideways...I can't understand who that would do that. I would think it would cavitate first.
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Old 06-02-2015, 05:47 PM
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Call DCB, I would think they would have the answers you're looking for.
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Old 06-03-2015, 01:02 AM
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To high of X is going to allow the prop to push the back of the boat around if it doesn't have enough skeg in the water. Like over trimming a outboard or surface drive, steering goes away. What rpm is the boat turning? How is it to get on plane, if you go to a shorty you might find the boat is really hard to get on plane.
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Old 06-03-2015, 10:05 AM
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I think you'd get so much stern lift that you'd eventually run the danger of hooking it.
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Old 07-01-2015, 02:52 PM
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Headers and a nose cone will help on a stock 502
If you are getting 89 with a stock 502, that's awesome
Not sure what the sliding sideways is about with a -2 shorty
I added a -2 shorty and it worked, but too much cavitation on start
I added -1 lower and it still cavitates on start but not as much, so not sure that will do much for you.
I had a little vortech blower, with headers, nose cone and 32 pitch to get 92 mph
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Old 07-01-2015, 02:54 PM
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I missed the part where u said 500hp.
do the nose cone and a 32 pitch, it will work for you.
I assume the 500hp probably already has headers
larry
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Old 07-06-2015, 09:34 PM
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Quote:
Originally Posted by ldillow View Post
I missed the part where u said 500hp.
do the nose cone and a 32 pitch, it will work for you.
I assume the 500hp probably already has headers
larry
Yes its the factory APBA 500 HP carb motor with (I forgot the name of the headers, they are black on the bottom with stainless top elbows, they are also the stock ones you see in the merc brochure)

It does have the nose cone.

Will try the 32, is going for a lab worth the extra? And would the lab prop make much of a difference at the 65-70 MPH cruising speed?
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Old 07-07-2015, 09:15 AM
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I run a 32 that is not lab. I may jet for fun do it, bit it works fine for me.
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