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Originally Posted by hogie roll
(Post 4685398)
excel? |
Originally Posted by 242LS
(Post 4685618)
I'd rather go with MAGIC, but yes - Excel. :-)
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Thanks for the info on Excel. I'll have to see if the home computer has it and if I can figure out how to use it. I have a bunch of dyno graphs from my motors that I'd love to see overlayed like that.
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Motors installed. Currently buttoning up wiring. Fabricating exhaust. Came across a interesting video I would like to share.
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Thats a cool vid!!! I'd love to have clear exhaust tubes on the boat just to verify water going through them easier!! :D
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Originally Posted by Wally
(Post 4686818)
Thats a cool vid!!! I'd love to have clear exhaust tubes on the boat just to verify water going through them easier!! :D
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Looking for some advice on exhaust. I am debating giving wet exhaust a shot. Wet section will be 22” long. 10” of that at 38 degree drop. Is that enough to combat reversion. In the 10” section will be ggb inserts. Past 10” section where water will be mixing is 13 degrees. Cam has 18 degree overlap. Idle will be at 1000 with 22 degrees timing. Is it worth my effort trying this or just go straight dry. |
Why are you wanting to run wet? Most of us here have went dry, so no worries with reversion and really doesn't seem that bad. We normally run 30-40 miles one way also. They make some dry mufflers don't they if the noise bothers you?
Just thinking of the cost if it reverts compared to the cost of noise suppression. |
1,000 RPM idle with Bravos?
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There have been some pretty big cams in Eliminators that have their typical steep drop, low exit S pipes.
Is yours like many of the single engine Eliminators ? https://cimg8.ibsrv.net/gimg/www.off...804033b460.jpg |
Originally Posted by SB
(Post 4686977)
There have been some pretty big cams in Eliminators that have their typical steep drop, low exit S pipes.
Is yours like many of the single engine Eliminators ? https://cimg8.ibsrv.net/gimg/www.off...804033b460.jpg |
Originally Posted by Knot 4 Me
(Post 4686971)
1,000 RPM idle with Bravos?
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Originally Posted by Wildman_grafix
(Post 4686966)
Why are you wanting to run wet? Most of us here have went dry, so no worries with reversion and really doesn't seem that bad. We normally run 30-40 miles one way also. They make some dry mufflers don't they if the noise bothers you?
Just thinking of the cost if it reverts compared to the cost of noise suppression. |
Originally Posted by mggdoors
(Post 4686995)
Noise. Plain and simple. I had dry exhaust on my sunny and I hated it, the guy behind me hated it, cops hated it, and the guy two counties over hated it. We ran the ggb inserts in them before, even still have the inserts. They helped but not tremendously. Went from like 118db to 110. To me I figure it like this. If it is going to revert I will know pretty quick before I even leave my house. I would simply idle it down to 800 mimicking in gear and idle for few then pop off risers and verify. Then do it again at the lake on the no wake zone. If it doesnt revert by then then it aint going to. You could also wait and dump right at the end, that still kills a lot and is even further away. |
Originally Posted by Wildman_grafix
(Post 4687030)
I just did a quick look and it seems at best most claim are 12db, which is a good amount but if you were 118 will not be enough if you have noise restrictions. Man they are pricey to!
You could also wait and dump right at the end, that still kills a lot and is even further away. |
Originally Posted by mggdoors
(Post 4686990)
yes. Mine is almost exactly like that. Mine would add water at the bottom right before she shoots through the transom e must remember, there are many more modified engines in Eliminators than there are stock one's. hah. |
Originally Posted by SB
(Post 4687032)
I'd chance it. Again, I have seen many BBC with Yuge cams in Eliminators with that exhaust and you ask owner about reversion and they have no idea what you are talking about. LOL. :) :)
e must remember, there are many more modified engines in Eliminators than there are stock one's. hah. |
Originally Posted by mggdoors
(Post 4687031)
The ggb inserts i have are i believe 7 disc. Definitely take the crack out. I will be dumping right before it goes through transom. My theory is between my angle of drop, length before mixing water, and ggb inserts pre water dump I may have a shot. Ive got a 20’ stick of stainless 3.5 and 4 so if i have to redo it do be it. Not trying to get prius quiet but reasonable especially with my minions on board |
Originally Posted by Wildman_grafix
(Post 4687038)
You know when you say 7 disc I wonder why supertrap doesn't make a system that would go on. Then you could dial in the amount of noise. Seems like their universal stuff stops at 3.5"
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Yeh, Supertrapp had a marine SSMuffler years back. There used to be a bunch of old Fountain 10 and 12Meters with them back in the day around here.
i tried a set and the noise reduction wasn't good enough for our tight DB rules. Believe it or not, the simple Drew Here is the drew's: https://cimg2.ibsrv.net/gimg/www.off...f7eed9b1e4.jpg |
Originally Posted by SB
(Post 4687042)
Yeh, Supertrapp had a marine SSMuffler years back. There used to be a bunch of old Fountain 10 and 12Meters with them back in the day around here.
i tried a set and the noise reduction wasn't good enough for our tight DB rules. Believe it or not, the simple Drew Sidewinder tips/mufflers (they use air pistons for slight resistance on the flaps)worked better for idle.low speeds (where it matters more) Here is the drew's: https://cimg2.ibsrv.net/gimg/www.off...f7eed9b1e4.jpg |
Here and there some will be for sale on OSO and sit around forever until the seller has to sell them cheap. I dunno' why.
They take out some bark of louder wet exhaust at start and low speeds...I doubt that effective with dry. |
Drew Shotgun tips. I don't know why I said Sidewinder. Maybe because it snowed on mtn behind me yesterday and still thinking of snowmobiles ? :)
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Originally Posted by SB
(Post 4687078)
Drew Shotgun tips. I don't know why I said Sidewinder. Maybe because it snowed on mtn behind me yesterday and still thinking of snowmobiles ? :)
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Progress report. Still ugly. Waiting on carbs from pro systems. Down sized. Waiting on one intake from trick flow. Both should be in by weds. Still gotta polish pipes https://cimg9.ibsrv.net/gimg/www.off...704cabfb7.jpeg |
with the room you have,,why not eliminate the rubber coupler and weld the pipes together.then you could dump the water at the very end of the tails.just a thought.
btw,lookin good |
Originally Posted by sutphen 30
(Post 4687552)
with the room you have,,why not eliminate the rubber coupler and weld the pipes together.then you could dump the water at the very end of the tails.just a thought.
btw,lookin good |
Reversion is present. Both banks 3rd cylinder back from the front is the worst. Drivers engine(the one that wasnt dyno’d) has weird chirp at idle. Goes away with rpm. Emitting sound from rear starter side. Sounds like starterbendix failing to engage or as Ive seen in past a lifter wheel taking a ****. Replacing starter today. Reversion debating going dry or just buying lightnings. Updates to come. |
Noise was starter. Bendix was not retracting from flywheel. |
Ok. So played with engines on the hose yesterday. Reduced idle timing from 20 to 14 and opened throttle blades slightly, mostly the secondary. Reversion seems to have vanished idling at 900 for 5 minutes. A few other things. I have exhaust leak at all risers. Having these milled. I can also still add the ggb inserts to help reversion as well. Only concerning factor now is the amount of heat I am seeing at the manifolds and risers. Water flow is good out the tail pipes. How hot is too hot? I would guess we were in the 150-170 degree range just idling. Am I flowing water too fast out the tails? |
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Originally Posted by mggdoors
(Post 4688720)
Am I flowing water too fast out the tails? |
Originally Posted by NautiSouth
(Post 4688724)
Water cannot flow so fast that it will not cool a hot object. That is a myth. What could be happening is insufficient water around the pipe (water only on the bottom due to gravity), or the water there could be boiling locally. Both of those would be bad.
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Correct, water too fast doesn't cause higher temps.
Also, exhaust leaks can cause/add to exhaust water reversion. |
Originally Posted by SB
(Post 4688752)
Correct, water too fast doesn't cause higher temps.
Also, exhaust leaks can cause/add to exhaust water reversion. |
like you, some say they reduced initial timing so they could increase throttle blade opening to,and did, fend off their reversion issues.
I can't answer on the heat temp...I don't even know what is normal or not. I go by water flow out of tips and if the rubber connector doesn't burn, LOL, BTW: I reread farther back and you said your exhaust is almost like the one I showed many other single engine Eliminators have. Well, it is not. Angle maybe close, but the one's like I showed have a much longer drop. I'm just pointing this out, That is all. |
Originally Posted by SB
(Post 4688759)
like you, some say they reduced initial timing so they could increase throttle blade opening to,and did, fend off their reversion issues.
I can't answer on the heat tep...I don't even know what is normal or not. I go by water flow out of tips and if the rubber connector doesn't burn, LOL, BTW: I reread farther back and you said your exhaust is almost like the one I showed many other single engine Eliminators have. Well, it is not. Angle maybe close, but the one's like I showed have a much longer drop. I'm just pointing this out, That is all. |
Subject of cooling the exhaust.....Some s,all block guys have welded 16-18" inners to factory or GLM exhaust risers to keep exhaust stream drier for longer and just ran normal rubber exhaust as the outer installed in regular spot and no issues for years and years. Not saying to do this, they had smaller cams, just saying how long and open the outer vs inner some people have had with no issues. Granted, they where running normal drop, not as steep as yours,,,so not a 100% direct comparison but same subject.
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Originally Posted by SB
(Post 4688762)
Subject of cooling the exhaust.....Some s,all block guys have welded 16-18" inners to factory or GLM exhaust risers to keep exhaust stream drier for longer and just ran normal rubber exhaust as the outer installed in regular spot and no issues for years and years. Not saying to do this, they had smaller cams, just saying how long and open the outer vs inner some people have had with no issues. Granted, they where running normal drop, not as steep as yours,,,so not a 100% direct comparison but same subject.
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Ok. Kinks worked out. Resurfaced risers. Exhaust leaks gone. Alternator took crap. Replaced. Power steering line ruptured. Replaced. Waiting on livorsi oil temp gauges to replace boost gauges. Prewired and ready when they arrive. Both were ran on hose for over an hour. Exhaust cools down after thermostat starts functioning. Reversion to manifold is none existent although if I pull the risers I can find droplets. Will install ggb mufflers after testing. Mounted and tig welded bimini. Wet sanded and compounded her. Going to lake Saturday and Sunday. Will be running holley dual planes initially as I just received the second trick flow manifold yesterday and dont feel like changing it yet. My boy Auggie at cutting edge is sending me some extra props to test with. Will be running 30 and 32 4 blades as well as my 32 5 blade. This boat last year got on plane 2 times and only 2 times with 4 blades. The ass end was very heavy without running extension boxes. 5 blades got here up but with alot of stern lift running. Im planning on the weight shed making planing easier but stern lift worse. Thats why I am testing 4 blades. That and the bravos were 8 mph faster than the 5 blades. Currently 1/2” above bottom with 1” spacer. 4 blades in this configuration would get her right there ready to tip over and boost would kick in and blow them loose. 5 blades did same but had just enough to grab. One last thing to do. She needs a name. Previous owner had it named Aly’s Cat. Heres my list. Help me decide. Enjoy ”Not that drunk” name of my old boat. Cops loved it. ”Hooter Scooter” ”wet kitty” ”I pull out” (What, I trailer my boat) ”prove it” for all the boys with there “100 mph” bayliners ”a-boation” ”dirty c-word” “Smiles per gallon” |
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