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I have always wondered about those. They look like they would absolutely work as they appear to be just a check valve as flappers are also, just to a lesser degree. My question has always been how much of a restriction they would be. Over the years, I have come to really enjoy silent choice, but I still enjoy hi-performance engines and that can be limiting as to what you can do. It would be interesting to know what HP limits Merc claims for these, kind of like we know that the Y-pipe becomes restrictive at somewhere just over 300 HP.
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Originally Posted by Quick2500
(Post 4318816)
If the cams ended up getting installed a few degrees retarded it would change the valve timing events, most notably EVC ATDC. With the longer exhaust duration that it already has, this would amplify low rpm reversion pulses.
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Originally Posted by Budman II
(Post 4318835)
Before doing this I could hold a $20 bill in front of the tailpipe and it would suck it right out of my hand - proof positive that boats eat money! :)
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Originally Posted by SB
(Post 4318849)
^^^^^Up for the factual sentence of the year.....for two categories: Technical and Financial !
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Originally Posted by Rattlesnake Jake
(Post 4318913)
Being frugal I would have used a ONE dollar bill.
I heard a rumor that the vacuum is greater when using $100's. |
Teenage boy walks into the kitechen and nervously asks his parents:
"Mom/dad - Can I go to the 50¢ concert ?" They both reply without looking : "Sure. Here's a buck. Take your little sister." |
Originally Posted by SB
(Post 4318915)
LOL ! So true !
I heard a rumor that the vacuum is greater when using $100's. |
Originally Posted by Budman II
(Post 4318835)
35Fountain, the Merc resonator looks interesting, but first I would try installing some salisbury type flappers on the ends of your tips to see if this dampens the back pulses enough to tame the reversion. I have a long thread on here about reversion with a mildly cammed engine when I was running mine on a test stand, and I found that simply installing the flappers significantly cut down on the reversion. Before doing this I could hold a $20 bill in front of the tailpipe and it would suck it right out of my hand - proof positive that boats eat money! :)
It is strange how one engine with what appears to be a mild cam setup will revert, while others that seem to be more on the ragged edge run happily along without apparent problems. My suspicion is that there are a lot of boats running around out there with some degree of reversion occurring, and no one knows about it. Mercury Marine part number 860222A1 RESONATOR-EXHAUST is used on the below models 454 MAG MPI BRAVO (GEN VI) GM 454 V-8 1998 454 MAG. BRAVO (GEN. V) GM 454 V-8 1996-1997 454 MAG. BRAVO MPI (GEN VI) GM 454 V-8 1996-1997 454 MAG. MPI BRAVO (GEN VI) GM 454 V-8 454 MAG. MPI HORIZON (GEN. VI) GM 454 V-8 496 MAG (Base Model) 496 MAG (H.O. Model) 496 MAG EC (Base Model) 496 MAG EC (H.O. Model) 502 MAG MPI BRAVO (GEN VI) GM 502 V-8 1998 502 MAG. MPI (GEN VI) GM 502 V-8 1996 502 MAG. MPI BRAVO (GEN VI) GM 502 V-8 7.4L BRAVO (GEN. VI) GM 454 V-8 1996-1997 7.4L BRAVO (MPI)(GEN. VI) GM 454 V-8 1998-2000 7.4L MPI MIE (L29) GEN. VI GM 454 V-8 1998-2000 8.1L INBOARD (Base) 8.1L INBOARD (Base) EC 8.1L INBOARD (H.O.) 8.1L INBOARD (H.O.) EC 8.1L TOWSPORT (Base) 8.2L Mag (Base Model) 8.2L Mag (H.O. Model) 8.2L MIE MPI (GEN. VI) GM 502 V-8 |
Originally Posted by liquidlounge
(Post 4318837)
I have always wondered about those. They look like they would absolutely work as they appear to be just a check valve as flappers are also, just to a lesser degree. My question has always been how much of a restriction they would be. Over the years, I have come to really enjoy silent choice, but I still enjoy hi-performance engines and that can be limiting as to what you can do. It would be interesting to know what HP limits Merc claims for these, kind of like we know that the Y-pipe becomes restrictive at somewhere just over 300 HP.
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