Muffler?

[greg fulk]

You don't have the cam advanced to much do ya?

[art leong]

Originally Posted by greg fulk

You don't have the cam advanced to much do ya?

We played with cam timing on the dyno last year. And I retarded the intake cam at the track in a test session one day, To try to get the cylinder pressure down (compression test =300pounds) It slowed up a bunch.

[smracer2002]

Art,I would try a straight thru design such as
a Max-Flow,MagnaFlow or a Borla.The cars we dyno
have usually picked up power over a chambered muffler
setup with the same id size.
Any reason you didnt use the crank scraper on the new
unit?

[art leong]

Originally Posted by smracer2002

Art,I would try a straight thru design such as
a Max-Flow,MagnaFlow or a Borla.The cars we dyno
have usually picked up power over a chambered muffler
setup with the same id size.
Any reason you didnt use the crank scraper on the new
unit?

I don't run the muffler on the track. I just needed something to steady the O2 signal at low rpms. I want to know if the chambered muffler would make the hp nose down at a certain rpm. Or would it just restrict it throughout the range.

The crank thats in this motor doesn't have any counterweights. I would have to have built it from scratch and didn't have the time. I will do one this winter, if nothing else gets first priority. Last year I had to figure out and fix the trans brake, and put and paint a new front end on the car.

[Ed Wright]

Art, you can have a muffler shop make a 24" extention with a 45 degree bend in the middle and clean up the wide band numbers down low just as well. Cheaper and takes up less room under the car or in the shop. I always took it back off for higher RPM work.

[art leong]

Originally Posted by Ed Wright

Art, you can have a muffler shop make a 24" extention with a 45 degree bend in the middle and clean up the wide band numbers down low just as well. Cheaper and takes up less room under the car or in the shop. I always took it back off for higher RPM work.

Yes thats probably what I should have done. I figured the muffler would be dual purpose, and easier on my neighbors ears. Hoping I don't have to put the car back on a dyno to see if it was the muffler. Or if there is something else.
There are a couple of other things I'm looking at. Hoping to get to a track next weekend to test it out.

[Eric Merryfield]

Originally Posted by smracer2002

Art,I would try a straight thru design such as
a Max-Flow,MagnaFlow or a Borla.The cars we dyno
have usually picked up power over a chambered muffler
setup with the same id size.
Any reason you didnt use the crank scraper on the new
unit?

Art, I have run dynomax ultra flow welded on my 70 challenger and picked up HP versus the headers.

They are street legal 3 inch inside pipe and come in oval and round. Part # 17220 Oval, 17223 round center in and out. Assuming you have a collector with a 3 inch piece on you can build your bolt on kit with adj length and turndown from Jegs for cheap and easy. True straight through and they flow like none other.

For your data file if you ever do the muffler thing again, or decide to drive you Super Stocker to the track!

[carbuilder]

I did extensive dyno testing with crank wiping scrapers,not one increased horsepower,not used in cup racing or pro stock,,the best oilpan is NO oilpan

[art leong]

Originally Posted by carbuilder

I did extensive dyno testing with crank wiping scrapers,not one increased horsepower,not used in cup racing or pro stock,,the best oilpan is NO oilpan

On the first motor I had a 4 quart oil pan. So I wanted to do everything possible to keep oil around the pickup.
On the new motor I have a 6 quart pan. So I just put in a windage tray.