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Rank: Top Rank Aluminum Star
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Location: Central Florida and the DC area
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I have been told that to increase power it makes more sense to work on the intake side than on the exhaust side. The exhaust is under pressure and pretty much finds its way out, but a well-polished intake or one with straighter passages allows more fuel-air mixture to get in. And isn't the center-dump harder to work on than a log manifold?
"I remember when welfare was for poor people..."
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Rank: Top Rank Aluminum Star
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YES!!
Think Russian Roulette with 5 bullets in the old revolver.
Jeff
PS: Let me know BEFORE your mechanic installs the swivel elbows. There's a trick to it that, if not followed, leads to leakage problems.
I'm STILL waiting for my bailout!
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Rank: Dedicated Tin Star
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Location: mebane,nc
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all of my riser were shot on the 72 boat and the 84 motor i bought for it had the elbows chem striped to remove the rust inside and sanded the gasket surface flat on a backed belt sander,and bought new risers.84 is fresh water cooled so the manifolds look good.
jeff ,whats the advantage to the swivel risers ,they look harder to seal?i have strate risers and 20 deg elbows.
tim
72 32' express
"http://www.theboaters.com/boats/Powerboat_Express_Cruiser_marinette_1972_anticipation"
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Rank: Top Rank Aluminum Star
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With the entre you get egg roll...Whoops! Sorry.
With log manifolds you (usually) get the swivel elbows. Inside are two tiny O-rings, one of which HAS to seal or wter gets in your motor. Piss Poor design, but that's what youy got.
Jeff
I'm STILL waiting for my bailout!
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Rank: Top Rank Aluminum Star
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Location: Lake Michigan
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Actually, most of the log style manifolds came with the fixed risers and 90 degree or 20 degree elbows.
Peter
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Rank: Dedicated Tin Star
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Location: mebane,nc
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i think when i can find some cheap 20 deg elbows i am going in to my good engines exh .it has one 4 " riser all the rest are all 6"got new risers when they were on ebay cheap.
after reading that report i wish i had new one for the new eng but the old ones look decent.
tim
72 32' express
"http://www.theboaters.com/boats/Powerboat_Express_Cruiser_marinette_1972_anticipation"
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Rank: Top Rank Aluminum Star
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Location: New Tripoli, PA
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Most of the 318/ 360 installations I've seen have the swivel elbows. Should would be nice to get away from them.
Jeff
I'm STILL waiting for my bailout!
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Rank: Top Rank Aluminum Star
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Location: Petersburg, Illinois
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Jeff if it works I want in too. My 401K difiently needs help & I promise I won't have a $300K party!
Roger
The trouble with getting old, There is a lot of info in memory, I either can't find it or don't trust it if I do!
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Rank: Top Rank Aluminum Star
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Here's what one of those infamous swivel elbows looks like: Jeff
Fastjeff attached the following image(s):
I'm STILL waiting for my bailout!
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