Dual or single plane intake???

« **on:** July 14, 2013, 10:20:11 pm »

I have a mildly built 454 BBC bored out 30 over and good cam and O/T Headers. I am going to replace factory alum intake to a nice polished air gap one. Should I go single plane or dual plane and why? I know one is good for higher RPMS than the other but I am only turning about 5000 rpms

« **Reply #1 on:** July 14, 2013, 10:25:51 pm »

for marine applications where you usually cruise at 3k and above a single plane manifold IMO is the way to go. dual plane basically limits 4 cylinders to half the carb, so at lower rpms it keeps the velocity up and turbulence down. but thats not really needed in a jet boat since anything under 2500-3k you probably cant even ride on plane.

something to read:

http://www.enginelabs.com/engine-tech/intake-manifolds-single-plane-or-dual-plane/

i have a torker II on top of mine.

« **Reply #2 on:** July 14, 2013, 11:22:28 pm »

Thanks for the info. They don't say nothing about jet boats when talking about. That's what I was thinking too. And thanks for the article.

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« **Reply #3 on:** July 15, 2013, 07:37:48 am »

I have a dual plane performer rpm on my 466(30 over BBF bout 450hp)...works great and looks bitchn. Had a torker on my 460 originally and went performer...no change. Rebuilt my 460 and put Rpm on. Didn't notice any real gain from a single-dual and I have a 18 cruiser. If you have it run it. The weiand stealth from what I've read is a good mani for jets though.

« **Reply #4 on:** July 15, 2013, 09:52:30 am »

Quote from: Horizonjet on July 14, 2013, 10:20:11 pm

I have a mildly built 454 BBC bored out 30 over and good cam and O/T Headers. I am going to replace factory alum intake to a nice polished air gap one. Should I go single plane or dual plane and why? I know one is good for higher RPMS than the other but I am only turning about 5000 rpms

I'm running a Weiand Stealth on my 10.5:1, 496 BBC with Chineese heads, QuickFuel M-850, mild Lunati roller cam. It's turning 4700 RPM with a fresh 9.25" impeller in my AT-309 pump. This is installed in a 22' day cruiser that's used primarily as a ski boat. I'm very happy with the set-up. Cruises well, and revs quickly when you put your foot into it. Beerjet had recommended this to someone else while I was building my engine. Kudos to him for the recco.

« **Reply #5 on:** July 15, 2013, 11:59:47 am »

So I probably won't notice if I run a dual or single plane then. That gives me more options then. Thanks

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« **Reply #6 on:** July 15, 2013, 01:43:13 pm »

Quote from: Horizonjet on July 15, 2013, 11:59:47 am

So I probably won't notice if I run a dual or single plane then. That gives me more options then. Thanks

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Dual Planes are for tow trucks and motorhomes, and possibly a low(er) powered mercriuser.
You can 'grow' into a single plane when you want to add some more horsepower, but you are "at the limit" now for dual plane, IMO.

Dan'l

Horizonjet

Dual or single plane intake???

ka0tyk

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Horizonjet

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