muffler spec? baffled?

[twobone]

I'm in search of a quiter exhaust.

 

My neighbor who is an automotive guru suggests I replace my 4 inch wide really loud exhaust with a baffled exhaust to cut down on both the high and low frequency sound. It has 2 inch in and out pipes. Most of the round section mufflers I have seen are of the perforated re-packable design. What are the differences? I can give up some hp for lower dbs

 

I'd like to keep the stock look with the round profile so I can mount my exhaust heat guard. I have young kids

[pi7ot]

How about this one?

 

http://www.cbsonline.co.uk/product/6%22_STAINLESS_STEEL_SILENCER_SIL6

 

m

[MHKflyer52]

twobone,

The link below has a good rebuildable muffler.

 

https://www.pegasusautoracing.com/group.asp?GroupID=MUFFLERLT&utm_source=201204&utm_medium=email&utm_campaign=201204

[twobone]

I think I'm going to try a local hot rod muffler guy who has a non-rebuildable muffler for $129 that is 24" by 6" round. in terms of total cubic volume it is over twice as large as my 22" by 4" muffler. Hopefully size is the key factor over funky design to lower noise. I will have to raise it up to avoid bashing it. Then again at $130, I will not worry too much about dents vs. a pretty aluminium can.

[blubarisax]

I threw one of these Dynatec Vortex Cones in-between the collector and muffler. It reduced my sound level about 4-5 dB

[Alaskossie]

twobone,

 

i have a stainless muffler that has only internal metal baffles in a radial pattern, from Summit Racing. It is too loud, and it is very hot, even with a stainless heat shield and some space-age insulation between the two.

 

i am planning to replace it with a Caterham-sourced muffler that has about the same o/a diameter as my present muffler and the shield. It won't look as classy as that bright stainless shield, though.

 

But I am hoping that the exterior of the replacement muffler will be warm but not hot. I have seen John Christensen's Westfield with a similar set-up, and his muffler, without a shield never got more than warm to the touch.

[ptrxly]

Used motorbike mufflers are always a great bargain. They are generally readily available as lots of bikers replace perfectly good mufflers with louder ones. The titanium can from a Kawasaki ZR12R quietened down my Busa powered Seven perfectly and it only cost $50. If it can flow well for a 180hp bike motor it should be good for a 1600 /1700 cc Kent engine also.

Peter

[JohnCh]

I have seen John Christensen's Westfield with a similar set-up, and his muffler, without a shield never got more than warm to the touch.

 

I'm runnig a Raceco titanium silencer, which as Tom notes, runs pretty cool to the touch. In fact the only time it ever felt hot was during dyno testing.

 

-John

[MBEARDEN]

I have looked at the Dynatec vortex units...How is it installed...three bolts thru the collector?...the photo looks like there are 3 hex bolts that hold it in place from the inside.

 

The exhaust fumes from the rear exhaust on my Birkin were terrible..yesterday a local muffler shop ran the exhaust out just past the rear fender ...it looks stock and made a huge improvement in fumes...it points out and slightly turned down...the sound seems less. I took the manager for a ride up and down the street...he thought the car was so much fun that he waived the charges.

[gjslutz]

I have an "Burns Stainless" that I repacked with steel wool. It was custom made for the original owner. It is quiet.

Straight through design with perferated holes that allow the sound to exit into the media. On WOT I get more noise from the TBI's and they are on the right side.

[blubarisax]

I have looked at the Dynatec vortex units...How is it installed...three bolts thru the collector?...the photo looks like there are 3 hex bolts that hold it in place from the inside.

 

The exhaust fumes from the rear exhaust on my Birkin were terrible..yesterday a local muffler shop ran the exhaust out just past the rear fender ...it looks stock and made a huge improvement in fumes...it points out and slightly turned down...the sound seems less. I took the manager for a ride up and down the street...he thought the car was so much fun that he waived the charges.

 

My shop cut the cone off so it was just the right size for a very tight fit (their smallest size is too big) and we inserted it into the tube on the muffler that slides into the collector. Did not use any bolts as it really has nowhere to go.

[twobone]

What do you guys think of this simple solution inserted into the pipe? Too restrictive?

 

http://www.ebay.ca/itm/4-5-EXHAUST-BAFFLE-2-INCH-PIPES-MOTORCYCLES-/120964555027?pt=Motorcycles_Parts_Accessories&hash=item1c2a0ca113