2nd Generation Specific 1986-1992 Discussion

13B Jet Boat Project

Old 12-10-2010, 08:22 PM
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Hi, I have a fun winter project, and have a few questions you smart rotory folks can help me with. The project is my 15' boat I have a jet drive installed and will be driving it with a 13b motor.

I have bought (2) bad 13b motors, picking the best parts from each to make one good motor. Motor #1 rear rotor through an apex and chewed the rotor housing up bad. Motor #2 front rotor through an apex and chewed the rotor housing up bad. the remaining good? rotor housings have this groove in a couple sections.

Question #1. Are these rotor housings reuseable, or are they crap? See next 2 Pictures

Question #2. If they are junk, can I use turbo housings on this non turbo motor without an issue? only difference I notice is exhaust is more open.

Thanks, Joe
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Old 12-10-2010, 09:28 PM
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Amazing idea! Might want to ask the rotary engine building and porting topic
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Old 12-10-2010, 09:52 PM
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Those housings are trashed. AFAIK, you'll have no issues using turbo rotor housings with the N/A engine. Everything i have done thus far has been turbo's. Hopefully someone with N/A engine experience speaks up on this issue.

Swweeetttt project BTW.
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Old 12-11-2010, 05:16 PM
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I love your project! I am a newbie at this site, and it seems to be dedicated to cars.

I too am doing a 13B boat project over the winter. I have a 1972 Mark Twain V-Sonic I/O that originally had a Mercruiser 90. I swapped that out for a 2.5 liter GM powered Mercruiser 120 in 1999. Pretty good performance but I want more, so I am installing a 13B that has been marinized and supercharged, mated to the Mercruiser Alpha I/O. I think the little 15' should scoot around pretty well with it. Should make about 300HP when I am done.

I would love to see the progress on your project!
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Old 12-12-2010, 11:14 AM
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Well damn you two make me want to do a rotary boat project.
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Old 12-12-2010, 08:17 PM
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Turbo housings will be a little bit of improvement in power as the exhaust sleeves have less restriction.

S/C Boat looks good!
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Old 03-17-2011, 11:31 PM
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Just a updated picture... after engine rebuild.Name:  pdp010-600.jpg
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And the digital LCD Dashboard... Work in progress...

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Old 03-21-2011, 06:28 PM
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Can't wait to see the end result.

That thing is gonna sound bad *** on the water!
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Old 03-22-2011, 06:45 PM
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Nice! What's that blower going to be powered by though?
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Old 06-07-2011, 06:22 PM
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youre thinking too small 26b turbo 935 hp thats how we do it in nz.haha nah looks like a cool project dude. good stuff.
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