Thread:

ok w/o rubber flappers in TT exhaust

is it cool to run through transom exhaust (exits underwater) without the rubber flappers?
they keep breaking off...
i've heard different opinions.

Originally Posted by southwind74

is it cool to run through transom exhaust (exits underwater) without the rubber flappers?
they keep breaking off...
i've heard different opinions.

Ok as long as you are running the snails on your logs, the upside down p-trap looking things. I have personally ran without them on a fairly big cammed boat with absolutely no issues. Your going to waste your money replacing them only to keep losing them in the lake on anything but a completely stock engine. I had a boat with a stock Olds 455 and never lost the flappers.

There is diffent quality flappers out there. When I had logs I was running 15yr old flappers on far from a stock motor. Had a friend replace his they lasted 2 trips. Went with a different brand and he is still running the same ones 3 yrs later

i think they're like 2 5/8 ID or so.
It is a stock motor, I've replaced both once or twice in three seasons.
yesterday i just flipped the one upside down and reinstalled it with the missing chunk on the bottom.
they always break clean off at the metal tab where the mounting screws are.
it think i'll look for thicker rubber and make new ones.
i worry about reversion, and its a simple fix...
oh and yes i do have the snails.

Originally Posted by southwind74

i think they're like 2 5/8 ID or so.
It is a stock motor, I've replaced both once or twice in three seasons.
yesterday i just flipped the one upside down and reinstalled it with the missing chunk on the bottom.
they always break clean off at the metal tab where the mounting screws are.
it think i'll look for thicker rubber and make new ones.
i worry about reversion, and its a simple fix...
oh and yes i do have the snails.

The flaps arent really there for reversion, they are there simply to keep wakes and waves from going up into the exaust when you are slowing down or sitting still. You would have to run a pretty big cam to have reversion problems with logs and it would be too big to be efieient with logs any way. I think I was told on this sight a few years ago that you dont want to go over 240 @ .050 exhaust duration with logs because you will gain nothing by doing so.I ran a 560 hp bbc with logs (not dynoed with the logs) with no flaps and no issues on a very rough lake. It is kinda neet hearing the flaps rattle though

I have edlebrock logs n' snails and 3" trumpets w/o flappers on a stock 350sbc. Haven't had any problems in 2 years and even shut the boat down accidentally one time coming to a stop and a big wave crashed into the transom. If I anchor, I do so bow out. Just remember to stay ahead of that big wake on decel and keep the motor running until you come off plane.

the answer is...
drum roll...

NO!

hydro locked the motor first time out!

its not worth it to me for a $10 fix

i had put the broken one back on just to run that day figuring it was better than none.

i sat for a second in a cove to make a call, then turn the key and locked.
pulled the plugs ran the water out and then ran the boat.
ran fine afterwords

i think now i'll just keep an extra pair in the boat and check them often for cracks and replace BEFORE they break.

ok so they're 3 5/8 inch.
i got some from a cool local shop but had to cut them down from 4 inches
they're from glenwood i think.
anybody know where to get some 3 5/8 inch rubbers