quote:Originally posted by Pittcrew:
Did your engine guy give you a guideline of what size primary pipe to run and how long they needed to be?
I had used some on line calculators some time ago to as well as some calculations Hot Rod published. They both pointed to 1-3/4" primaries. Any larger I might increase power slightly but loose more midrange power and possibly idle issues.
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Is that information what you used to configure the set up you are working on?
Honestly this design is based more on physical function then engine function. I see people make huge changes in exhaust and get a small improvement in say mid range power yet small change in over all power. Some of this may be noticeable on a dyno but I doubt a big deal in the grand scheme of things. I simply wanted to make sure the primaries and secondaries were big enough for flow.
I plan on running the engine again on a dyno with my old headers and these headers, with the Barry Grant carburetor and the 4 down draft webbers. I want to see the difference in the carbs and with the headers. There is more at work here then what I can totally grasp and I would like to see through testing the difference.
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I thought I read in another post that you were going to use oval tubing for clearance around the frame. Did that not work?
Some one else had suggested that but I never had any intention of doing that.
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What are you using for mufflers and how are they going to exit the car?
Thinking of making my own mufflers! Still looking at designs. I have some ideas which will look similar from behind but may enter through the top of the rear instead of the rear. We'll see where we go from here.
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Sorry for all the questions but I think this kind of fab is cool. You ,Johnny and Ron are my Heroes.
If there is anything I have learned is that EVERYONE is more capable then they know!! Everyone!