Header Design & Build

Indycars said:

Maybe it's time to make the jump to an OD transmission. If you are still interested in a 200-4R, I have two complete trans with lots of spare parts. I bought out a transmission shop that had 3 complete trans (2 left now) and lots of used parts.

I cleaned up all the used parts, dipped in ATF, bagged them, labeled them and put them in boxes with more labels.

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Where do you get the time... and energy? I’m envious!

Indycars said:

BTW, my mockup kit cost $650

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And that is returned when you send the kit back with an order, right?
Mercy, you are better stocked than most shops! I'm going to stick with the TH400, I guess, because a swap is easy. But I am going to review the 200-4R and see what it would entail. Naturally a change to the tranny mount and the driveshaft, not big deals.

PotvinGuy said:

And that is returned when you send the kit back with an order, right?
Mercy, you are better stocked than most shops! I'm going to stick with the TH400, I guess, because a swap is easy. But I am going to review the 200-4R and see what it would entail. Naturally a change to the tranny mount and the driveshaft, not big deals.

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Yes that money is applied to your order.

The 200-4R uses the same spline and length of driveshaft. You only have to change the trans mount location. If you can handle a longer driveshaft the 700-R4 is more plentiful on the used market, but the gears ratios are not as good.There is pros and cons to both transmissions.

I decided it was time for me go back and scrutinize every input parameter since it was too
easy in the beginning to be excited and to hurry thru, wanting to get some header
dimensions. So I went back and reviewed all my numbers for Pipemax and found an
error for the "Cylinder Head Exh Port Flow". I had 157 cfm and it should have been
174 cfm.

Then I remembered how the Pipemax forum had a thread that Larry Meaux had posted
called "How to use PipeMax v4.00 Correctly" which involves aligning Pipemax with your
dyno numbers. I don't have a actual dyno test, but I do have Dynomation simulation dyno
run. Anyway this opened another can of worms and level of complexity of Pipemax. I
had several posts and PM with Larry Meaux to clarify somethings.

The exchange starts with the second post in the link below:
MaxRaceSoftware • View topic - How to use PipeMax v4.00 correctly

I also started this thread on Monday November 11th. You should be able to read in this
forum, but you won't be able to post unless you own one his software packages.
MaxRaceSoftware • View topic - Pipemax 4.5 Questions

The new dimensions are shown below and out to the side are the old measurements so you
can see the changes. These inputs and dimensions could change again and probably will.

I am anxious to see the end result and hear your assessment of how noticeable of a difference you notice in performance. Hope it is rewarding for you!

fletcherson said:

I am anxious to see the end result and hear your assessment of how noticeable of a difference you notice in performance.

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That makes 2 of us !!! ... Thanks so much for responding, I thought most of our membership
had turned a blind eye to my experiences until you spoke up.

At the end of this exercise, I will have no choice but to learn something about mass flow
and wave action in the exhaust. Again I'm sorry for boring most of the membership!

I still like it and am following along. Just so you know.

Indycars said:

That makes 2 of us !!! ... Thanks so much for responding, I thought most of our membership
had turned a blind eye to my experiences until you spoke up.

At the end of this exercise, I will have no choice but to learn something about mass flow
and wave action in the exhaust. Again I'm sorry for boring most of the membership!

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I, for one, am not bored. I find it interesting. I have refrained from commenting much, waiting to see what your design interest was. It is nice to have the data to help guide you in your endeavor at least as opposed to just making it fit and hoping it performs. I have however, been disappointed with results of various modifications in the past on different builds. The outcome was less climactic than anticipated. It seems like no single modification makes a very noticeable improvement... it’s the combination that adds up. I am hoping for you that this is not one of those situations considering the effort and investment, but it’s a hobby, right? At least you can hopefully achieve your goal of creating a passenger friendly ride and hopefully realize a performance boost. I used to build a fair number of hot rods, etc, and really took interest in the simulation software like “Desk Top Dyno”, etc when it came out. It was fun to pre design stuff before spending money on parts. It does get monotonous after a while. I and a few friends grew up building cars from scavenged parts... leftover race car parts from someone’s dad or uncle, bone yard, bartered stuff, lol. I wish we had the software back then. When planning a build, I liked sitting down with a list of what we had, and trying to figure out how best to utilize it, what items to procure to best enhance it, etc. I wish that I had the energy and motivation to continue.

I’ve been following along too. Just way over my head for me to make any intelligent comments.

I'm following along, curiously awaiting the outcome.
I know from going around in dirt circles that there are some headers better than others for low end torque or for high end power. There was always a compromise based on the target rpm where the engine was to spend most of its time.
I love what you are doing. Keep it up.

I follow each post, although since it's out of my areas of greater knowledge, I don't comment much.

I too am most eager to see where this journey takes you.

I'm not patient enough or smart enough to deal with all the numbers, but I am fascinated by the idea of designing your own header system, and look forward to the performance results!

Looks like I’m with most of you guys. I watch (and work with him) but what we are trying to do is way over my head. Try ing to get the lengths of tubes is proving to be quite the challenge but is very satisfying when you get it but frustrating when the next tube is way off!

Well ..... I'm surprised at the amount of interest!

Thanks everyone!

As you know, Indy, I do all my calculations in my massive brain, and so far you are spot on.

Well, thanks for that conformation! Did you get a transplant since the last time?

Why, yes, I did get a new brain. It was labeled Abby Normal...or something like that.

Hey Rick, I ran across this vid the other day and thought of you. Don't know if you've seen it already or not but here it is just in case. May or may not help but figured I'd post it anyway.

Jet, very nice video. Led me to spdexhaust.com for header parts.

JetMech727 said:

Hey Rick, I ran across this vid the other day and thought of you. Don't know if you've seen it already or not but here it is just in case. May or may not help but figured I'd post it anyway.

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I've seen that kit before, but not that exact video. The kits are pretty expensive unless
you are doing several headers.