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Exhaust riser angle

Old 06-08-2007, 10:39 AM
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Originally Posted by 30ctsutphen View Post
Those risers come up quite a bit higher than mine but its the same basic set up.
I even have the same o ring'd thru hull covers on the back in the same location.

I think I am gonna go out the top so I can put silent choice on her easily.
That is a sweet looking sutphen.
I always wondered why so many race boats were small block boats?
Thanks for the pic.
Its much appreciated.
Thats how our 30 was set up too.

Silent Choice????? What's that?
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Old 06-08-2007, 10:46 AM
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30ct, your risers are probably a little shorter than mine so if you go strait out you might want to consider some inner flappers or something similar. Mine doesn't suck water up but if a cruiser or something big wakes the boat while its anchored it could become a problem. I just bought a set of Eddie Marine manifolds and risers and had them put the inner flappers in the end of the pipes. They turned out really good considering that I hate exposed flappers and it gives me some peace of mind.
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Old 06-08-2007, 11:49 AM
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Fobes on this board had a 20 with BBC and TRS = lots of weight. PM him and see what setup he had and how well it worked. Merc manuals have the requirements for stock engine and manifolds.
Phil

Last edited by Sutphil; 06-08-2007 at 01:45 PM.
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Old 06-08-2007, 09:27 PM
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stultz makes a good point...my old boat had a similar set up for the same reasons...i had a bungee over the flaps while moored, just in case...
i had imco risers, which were awesome, but i feared the random wake up the pipe....
here's my set up...and i still use the bungee while moored....
Attached Thumbnails Exhaust  riser angle-picture-023.1.jpg  

Last edited by ChristianGott; 06-08-2007 at 09:33 PM.
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Old 06-08-2007, 09:40 PM
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here's dave's set-up, and the set up from a 30-OP that used to be in clinton..
Attached Thumbnails Exhaust  riser angle-picture-132.jpg   Exhaust  riser angle-picture-049.1.jpg  
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Old 06-08-2007, 11:35 PM
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Yeah those look alot like what I am doing but the risers are about two inches higher than mine.

I had read on here you needed at least a 14 drop from riser to exit in another forum.
I didn't see how that could be true since we ran so much less with no issues. I wantedto be safe and aska round though.

Thanks for all the great input.
I feel alot safer doing in the sraighter exhaust having seen so many running it with good results.

My boat will never really stay in the water its trailers all the time so the rouge wake isn't as much of a concern but I will get the internal flappers anyway.

Sutphen guys are the best always willing to help eachother out.
Its alot like drag racers that way!
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Old 06-09-2007, 09:33 AM
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Info below from Mercruiser.
Attached Thumbnails Exhaust  riser angle-exhaust-small-.jpg  
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Old 06-09-2007, 10:42 AM
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Thanks sutphil.
It was a little too small for me to read but thats OK I already sliced and diced them to fit properly.

I am in the welding phase right now.

These were easier than making a car header thats for sure.
I guess I thought there'd be some magic inside there or something.
Very simple design.

The stainless marine risers are even easier to make now that I have checked out a set up close.

Thanks again for all the help.
We'll see how it works out.
I am not throwing away any removed peices just in case!LOL

Last edited by 30ctsutphen; 06-09-2007 at 10:49 AM. Reason: Omitted enough letters that it looked like code!
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Old 06-09-2007, 07:29 PM
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dude..that edit reason is freakin, classic....
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Old 06-09-2007, 09:31 PM
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Originally Posted by wstultz View Post
My pipes work fine. They are strait out but the stern sits so low in the water it doesn't cause a problem.
wstultz are those imcos i see in that pic? I dont see any water dumps in the pic are they wet or dry?
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