Carl Fausett

About a year ago, there was a thread on here about some China rip-off MSDS headers on eBay... and you may recall, toward the end of that thread the conversation had turned to merged collector headers.

Marty at MSDS and I paid attention, and started work on a set of merged collector headers for the 32v 928's.

They have been through 2 iterations, where they come here to be fitted, I tweak them, and they go back so Marty can adjust his manufacturing jigs. Now they are a reality, and YES, they do fit with our Stainless steel Header-X pipe. The Header-X allows you to connect your headers to your stock exhaust, or (better) our performance exhaust.

I am sold out of our Header-X at the moment and more on on order.
I have two pair of these merged-collector headers in stock right now.

Here is the webpage link:
http://www.928motorsports.com/parts/headers.php

Uncoated, the merged collector headers are $868.
We can also Jet-Hot coat them as we are a Jet-Hot dealer.

Here are some pics:

hacker-pschorr

Safe to assume 16V - Early 32V versions are also available?

Carl Fausett

Not yet, no. There is a stock on hand of 16v headers with standard collectors that must be sold out first, before Marty will start making the 16v headers also with merged collectors.

hacker-pschorr

I have the "old" MSDS headers on my 79, I've never had to work on the clutch (knock on wood......please Lord) but from what I can tell the headers are in the way.

It looks like these will give the proper clearance by pulling the merge collector off, which would be MUCH easier than messing with the bolts on the head.

Bummer.....rough idea how large that stockpile is?

Unless those are heavily discounted this will turn into a Mexican stand-off. People will want the new ones and will patiently wait for the old stock to be sold off.

Honestly I don't understand why Marty never copied the Devek Level II headers. The exhaust flange was designed in such a way to fit all three heads.

Carl Fausett

Given that Marty sued the american importer of the company that knocked-off his header design, I think I can guess his feelings for "knocking off" somebody else's design.

hacker-pschorr

Yea I know, but it's a simple mod to one hole in the exhaust flange.

So simple I'm tempted to buy a set of these and have Todd make such a modification so I can bolt these onto my 81.

Not to mention the D-LII headers have not bee on the market for well over a decade or so. I'd love to buy a set of those but they are harder to find than a reliable MG.

Carl Fausett

so you believe one hole in the header flange converts them to a 16v header?

hacker-pschorr

Sorry, two holes...... I mis-typed.

terry gt

So what's the advantage of the new collector ? Any comparable dyno results ? can the new collector be added to older msds headers ?

Carl Fausett

Right. Two holes. But how did they resolve the difference in diameter? 34mm at the exhaust outlet (4.5 L) and 41mm at the outlet 32v?

So they just mismatched the exhaust bores that badly and were OK with the turbulence it caused at a critical section in the exhaust system?

hacker-pschorr

Guess so, unless those were more or less intended for 85/86 cars and not 16V owners

So the 32V MSDS headers have larger primaries than the 16V ones? I wasn't aware of that.

Carl Fausett

That's the rub. I had every intention of running these headers on the engine dyno when I broke in my motor (pic below) and then was slapped in the head by the fact that the dynamoter occupies the very space the headers have to be in (duh). The 928 is a Torque Tube car, and the exhaust is aimed down the center line.
Rats. No engine dyno possible.

So - then chassis dyno results? Right. Imagine this; someone has to bring me a 32v 928 with stock MSDS headers on it so I can take it to the chassis dyno for the baseline. Then I would have to swap out the early open-collector header for the merged-collector header, and dyno again.

That situation has not yet presented itself, so I do not have any dyno charts for you.

Carl Fausett

If you missed it, engine dyno video is here:



he could put so much load on that engine it wasnt even funny. We went through 10 gallons of Sunoco 110 in under 20 minutes!

Carl Fausett

Increases in HP and Torque are common with merged collectors. But to get ALL the increases that are possible, expect to play with 3", 4" and 5" collectors after the merge to put the torque curve where you want it.

As shipped, these will service you well.

Carl Fausett

Hacker - I held these 32v headers and also one of our build-your-own 32v header flanges
http://www.928motorsports.com/parts/headerflange.php

..to a 16v motor I'm building. Here you can see how off that is, and what a bad idea IMO