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patalive
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Capping One Side of Muffler???

In one of the recent and numerous posts on mufflers, one or two of you mentioned that you cap one side of your two-outlet mufflers.
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This raises a question in my mind. I am considering getting the Dansk two-in/two-out Sport muffler for my 83SC. I have SSIs now but the old, stock pre73 muffler has holes in it and needs replacement.
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Do the inlets to the muffler dump into a single, common chamber in the muffler so that when you cap one side, all the exhaust gases exit on the open side and back pressure on the cylinder banks remains equal. - - - OR, are there essentially two seperate sides to the muffler with a small cross over - so that when you cap one side, the corresponding bank of cylinders experiences increased back pressure?? In other words, is any harm done to the engine? I know performance decreases a bit with one side capped, but I am concerned with unequal back pressures and its effect, in any, on the engine.
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I like the idea of capping one side to decrease noise levels on the street and uncapping for DEs on the track in order experience the "full thrill" of the twin outlets.
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Thanks in advance for your thoughts.
Chuck

Old 11-17-2000, 04:32 AM
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RarlyL8
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To be on the safe side I would call Dansk and have them send you an internal picture of their muffler. Generally, the "sport" type mufflers have a common chamber where both banks mix so it is OK to cap one end. On mufflers like the Monza you can see that the two banks are isolated as true dual exhaust so capping one side would be a disaster waiting (not for long) to happen.
Old 11-17-2000, 06:11 AM
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patalive
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Follow-on Question: To those of you who have capped one outlet: how did you do it? Is there hardware available or did you fabricate your own caps? If you have digital pics, that would be super!
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Thanks much
Chuck
Old 11-20-2000, 02:40 AM
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JackOlsen
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Chuck

I took an extremely low tech approach, which was to cram a tennis ball in one of the outlets (mine had a little lip on the chrome tips that would hold the ball in place -- usually). After getting stopped about a half a dozen times by well-meaning motorists who thought some kid had played a trick on me, I dipped the tennis ball in some black paint.



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Jack Olsen
1973 911 T (3.6) sunroof coupe
Old 11-20-2000, 09:47 AM
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patalive
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Wow, Jack - that is very low tech and brilliant. But doesn't the tennis ball get hot and begin to melt? As usual, the simple solutions are generally the best.
Thanks much.
Chuck
Old 11-20-2000, 01:02 PM
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JackOlsen
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I haven't seen any melting, yet. I haven't pointed a pyrometer anywhere, but I don't think exhaust air, by the time it reaches the outlet, is really all that hot.

I think my scheme will need more modification, though, before it's complete. I've shot out two tennis balls so far, under acceleration. That doesn't seem very responsible to me. I'm thinking of a piece of metal bent to hold the ball in place as a next step.

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Jack Olsen
1973 911 T (3.6) sunroof coupe

[This message has been edited by JackOlsen (edited 11-20-2000).]
Old 11-20-2000, 04:21 PM
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paulhagedorn
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I can just see the headlines now...biker hit by tennis ball shot from car's exhaust?!?!? The biker was released from the hospital today with minor injuries due to being knocked off his bike. He was riding along while crazy man in Porsche shot a tennis ball at his head.

HAHAHAHA.

Sorry, just had to post that. Too funny.

Paul

Old 11-20-2000, 04:42 PM
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