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242LS Repower with 588 CI GEN 6

Old 05-12-2008, 04:12 PM
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Well guys... it blew up into pieces. Actually all is going well. I'll be picking her up from the fiberglass shop in a day or two. To answer a couple of questions that have been asked:

1) The ride has been outstanding. I've run a couple of poker runs and it has handled some pretty nasty water with no problems. The drive didn't do too well though.

We took some 4-5 foot jumps with no issues and at WOT. I'd say it took the rough water better than any other 24 footer.

2) I'm not sure about a 28 4-blade prop. I've tried a 24P 4-blade Hydromotive and couldn't spin it like I'd like to (looking for 5500-5700 RPM) and it made the backend loose. I'm turning a 27P Mirage Plus and that seems to be what the boat likes. Running 70MPH at 5000-5100 RPM.

I'll let you know about the IMCO and taking the hook out benefits (if any).
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Old 05-13-2008, 02:51 PM
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Hi All,

Not too much progress, as I got the wrong oil pan, now need to exchange it... so that will be a few days..

Anyway, I spoke to Dave at IMCO, and good news is that the drive should live at 7,000 + RPM with the mods I have planned. They reccommend 6500 RPM and the increase I was told is ok depending on hull weight, oil cooling, and a few other things... Anyway, that's the good for today..

TORQUE is what breaks the drives... So, if you have a high RPM motor with 650 lb/Ft the drives should be fine according to IMCO.. (I should have about 800 - 850, so I need to look at ways to alter that a little bit, and or move it up the curve.)

Oil pump, dipstick, and pickup are in.. Now need some coolers, and a flywheel etc.., CMi is supposed to modify my TRS tailpipes to fit the Bravo transom.., but still waiting on an RMA # from them.......

Custom intake in process of being built... This is Exciting..!

R
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Old 05-26-2008, 08:55 AM
  #23  
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Anyone on here actually have or know of anyone that has run a 242 with the hook removed? I'd really like to hear what the differences were. Ride, speed, and stability
Also was the hook removed totally or just partially?
Toying with taking down but not all the way.

2" shorty worked well and I think working on the bottom is the next logical step.
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Old 05-27-2008, 06:21 PM
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Hey 242-502,

I don't know anyone, but I called up the factory, and spoke to their tech dept about it, as I am in process of a custom repower.

They said that I would have to add material to the inside of the boat, but remove the plywood first, build the bottom up to how much I wanted to remove on the outside, and then add the plywood back, glass it all, and seal it up..

They did say it would gain a few Mph.. Not exactly how much, but a few... I am guessing 3-5 Mph based on the indirect answers I got from them...

After all that work, and chatting with the tech guys, it seemed that there may be an easier bit than all that work, by just adding more power for the 3-5 Mph top speed....

A racer guy told me that the boat might be prone to chine walking without the hook, and there are other ways to solve the hook issue....

Hope that helps,

R
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Old 05-27-2008, 07:05 PM
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Thanks
More to think about
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Old 05-28-2008, 08:41 AM
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Originally Posted by formula242-502
2" shorty worked well and I think working on the bottom is the next logical step.
formula242-502,

do you have any before and after numbers/figures with the shorty? what kind of HP did you start with and what other information about your setup can you supply. Very interested in the gains of a shorty on a stock 502 setup. Thanks
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Old 05-28-2008, 09:27 PM
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Started out at 68-69 mph with the stock lower
Ran a consistant 70-71 and hit 73 once on the GPS
I should have around 525 HP
All speeds with the same modded 23 mirage plus
I have not had luck with any 4 blade yet, but have't been able to try many either.
Boat rides flatter in shoppy waves due to less trim required.
Did have a problem in 4-6 foot waves with blowout - right 4 blade should solve that.
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Old 05-29-2008, 01:14 PM
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Pretty interesting stuff...! I have a 23P mirage on mine now, and after the repower I will test and tune for optimum prop.. My imco sc has a 1 inch shorter lower on it..

Do you have an extension box as well?

R
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Old 05-29-2008, 08:22 PM
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No extension box
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Old 06-02-2008, 01:52 PM
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Thanks,

R
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