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Engine Technical Discussion This is our non outboard engine related technical discussion forum. If your boat is powered by a Inboard/Outboard, Jet drive, V-drive, or even something else, then this is the forum for you! Topics include engine repair and maintenance, modifications, drives and gearcases, electrical and electronics, etc. For technical assistance related to outboards, please use our outboard tech forum.

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Old 05-30-2003, 11:56 PM   #1
Dave T
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Has anyone ever tryed them On A stock 310 MPI?I just picked up A set today for the 502 Iam building .What A weight difference Just wondering If it would be worth puting them on the 310hp before I finish my 502.
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Old 05-30-2003, 11:56 PM   #2
Dave T
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Has anyone ever tryed them On A stock 310 MPI?I just picked up A set today for the 502 Iam building .What A weight difference Just wondering If it would be worth puting them on the 310hp before I finish my 502.
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Old 05-31-2003, 06:40 PM   #3
vinny p.
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There is not alot to gain performance wise with just adding exhaust. But, the weight difference and eye candy is nice. I would never own a boat with stock Merc. exhaust just for the saftey factor. Their leaky riser gaskets and log style manifolds are junk in my opinion. Too easy to encounter a reversion problem with stock manifolds. I say go for dry joint manifolds and risers like Gils'. No chance of a leaky gasket wrecking a motor with that design.
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Old 05-31-2003, 10:55 PM   #4
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Thanks Vinny,
These have the aluminum risers on them Ccame with them)I have to buy the stainless risers for the new engine but I am waiting for other parts so I thought I would put them On the 310.Did you have to do any changes in fuel delivery on the mag EFI?
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Old 05-31-2003, 11:21 PM   #5
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Yes, but I didn't bother getting the ECU re-mapped. That just scares me too much. I have heard of too many horror stories from improperly re-mapped fuel curves. I figured that Mercs' stock fuel curve was on the rich side, so all I did was add an adjustable fuel pressure regulator. I bumped the pressure 5 psi. I also added an MSD 6M-2 The plugs look great and the motor runs great.
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Old 06-01-2003, 01:18 AM   #6
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Dave,I've got a pair of S/S risers on Ebay now. Check em out,see if they'll work for you.(under marine exhaust) See ya on the river if it ever stops raining!
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