Tri Y vs. Conventional Header....

[1320racer]

my initial gains were with the standard F.O. years later I swap to the "C": F.O.

Can't say it was any quicker and it wasn't slower but definitely had a new sound.

[ron mattson]

Wade check p.m.

[Grant Eldridge]

Not really a thorough evaluation, but we did a dyno pull using the same stepped primary pipes, first pulls were with a 4 into one burns merge collector and 18" of collector pipe, then replaced that with a 4 into two into one merge collector setup with a megaphone style end. We changed nothing else and saw a 4 hp increase. We were chasing other issues and did not change the tuneup, but felt that at least we did no harm with the Tri-Y setup so intend to use them in the car and test further at the track. It seems that the fuel curve was considerably leaner than previous tests we had done but the BSFC numbers looked good on our dyno sheets so we'll give them a try...

[Jim Wahl]

Originally Posted by Alan Roehrich

I also have a side line. I stand in as a scarecrow for farmers. It's boring, but it pays, and nothing will go into one of those fields if it has any sort of decent eyesight.

Especially if you're wearing shorts!! Jim


.

[Alan Roehrich]

Originally Posted by Jim Wahl

Especially if you're wearing shorts!! Jim


.

What really worries me is that you were actually looking ...............................

[NewHemi]

Now that is funny, I don't care who you are.....

David
The New Hemi Guy

[Wade_Owens]

Originally Posted by Grant Eldridge

Not really a thorough evaluation, but we did a dyno pull using the same stepped primary pipes, first pulls were with a 4 into one burns merge collector and 18" of collector pipe, then replaced that with a 4 into two into one merge collector setup with a megaphone style end. We changed nothing else and saw a 4 hp increase. We were chasing other issues and did not change the tuneup, but felt that at least we did no harm with the Tri-Y setup so intend to use them in the car and test further at the track. It seems that the fuel curve was considerably leaner than previous tests we had done but the BSFC numbers looked good on our dyno sheets so we'll give them a try...

Grant, thanks for the info. I really think the 283 would benefit from them, maybe more than a larger cid. Its all theory for now, but, would I like to mock up a set and see.......

[Greg Hill]

A Dyno is not the best place to try headers. A bigger header may make more power on the Dyno but be slower down the race track.

[Alan Roehrich]

What you'd look for when dyno testing headers would be average torque and horsepower through the RPM range you're running. You'd also want to look at the acceleration rate you test at. You have at least 3 different acceleration rates, if you have a 3 speed transmission, and that does not account for the fact that once you shift from first to second, from there on, your acceleration rate (in RPM per minute) slows at a progressive rate, the higher the gear, the slower the acceleration rate.

[chassis1]

a dyno is the only repeatable situation.......I know there are many who would rather make a million runs on the car and put more variables to see if a header is any better than another.....

dyno is much more affordable in my book......