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Author Topic:   How to install IMCA mufflers.
TRM38
Member
posted February 07, 2004 09:16 PM
I've had the best luck with tack welds. For a while I welded them to collectors, then welded on tabs and bolted the collector to the header. Those tab welds tended to breaker over time, so I'm going back to tack welding.


chevy_20
Member
posted February 07, 2004 11:21 PM
I ran a track that required them and another that didn't.....i just used 2 or 3 small sheet metal screws to hold them in and it made them easy to take out.


HarrisMod#30
Member
posted February 08, 2004 10:14 AM
quote:
Originally posted by TRM38:
We found out our track is mandating mufflers this year- JOY!!
I bought a set and they have absolutely ZERO instructions. I have the Dynatech headers made for my Sardeson chassis. The muffler slides completely inside the right side collector, but the left only goes 2/3 of the way. I might be able to get it all the way in if I can swedge the end of the header slightly. But then, how do you secure them into the tube. Is it legal to use sheet metal screws, or should they be tack welded?
Thanks!

check other problems with imca headers .they have been posted here before.



TRM38
Member
posted February 08, 2004 05:36 PM
i have had the best luck using rivots to hold the mufflers in. have used sheet metal screws but they seem to loosen up after a couple of nights and fall out.


dirtywrench13
Member
posted February 13, 2004 05:58 AM
FOR GOD'S SAKE DON'T SLIDE THEM IN ALL THE WAY!PUT THE BIG END IN FIRST,JUST FAR ENOUGH TO FASTEN IT,THEN PUT A TURN DOWN ON TO HOLD IT ALL TOGETHER.KEEP AS MUCH OF YOUR COLLECTOR OPEN AS POSSIBLE AS THIS WILL GREATLY AFFECT YOUR POWER BAND (SEVERE DROP IN HP & TORQUE). THE MORE OPEN COLLECTOR THE LESS THE RESTRICTION.


outlawstock17
Member
posted February 13, 2004 06:14 AM
if you have the room, use some extra tubing and get the mufflers as far away from the collecter as possible. as the temperature of the exhaust gas decreases, it gets denser. the farther away the mufflers are, the better they will flow. actually, they're best left at the shop....