I'm coming home tomorrow.

Let's hope nothing else flys off my mini on the ride home I got the JCW wing in the mail on Sat too.

Anyway I agree that port matching hasn't been discussed as much as it should on this forum and I would like to thank Mr. Hollingshead from Precision Mini to bring this subject to light for those not knowing. And thank you MSFITOY for the pics to bring it home! -- Johan

 

Bob,

Go back to your header thread "Headers....which one....why?"

https://www.northamericanmotoring.co...t=78683&page=2 Post #35

 

I apparently need to be hit over the head with a point because while I see what you are alluding to it is too subtle for me to make the connection.....could be just me.... but thanks for trying

 

MSFITOY,
Did you finish grinding the excess from the flange on your header? If this works out for you then I may consider this eventually....

 

There's too many head threads going on...I'll post this in here too.

On my Custom Head, the OBX header was actually larger than the exhaust ports. I think the OBX is 1 5/8" ?? Correct me if I'm wrong. Our flow numbers are comparable to the flow numbers on Randy's head. -- Johan

 

[quote=dmh;1189060]--From what I can tell the Stahl header/cat back is the only performance exhaust system built for the Mini. If there are others I have not ever seen them. quote]

Why haven't you ever seen them Don are you saying that you have never evaluated any other header/cat back with your head

 

[quote=Paul Webster;1199349]I have seen (in person and in pictures) numerous street headers such as MTH, Milltek, Larini, OBX, Megan, Jackson, Alta, Mini-Madness, MiniaMania, and GTT (to name a few) but not any that I would consider a serious performance header such as the Stahl. Same for cat backs. If you can name a performance header/cat back I'll take a look.
Yes, I have tested the Stahl compared to stock and some of the previously mentioned.

 

[quote=Paul Webster;1199349]Just out of curiosty, have you seen the Stahl? In person?
I can see you have some healthy 1/4 mile times so what ever you're using works well

 

I should hope so with NOS and drag radials!

 

So what you're saying Don is that you can by looking at all those headers whether in person or by a picture know that they will not outperform a Stahl header though you have never tried them on a car and quantified the results on a dyno or on a track

Surely every header will give differnt results whether they be gains or losses depending on the camshaft / cylinder head / pulley and all the other varlbles.

You must admit it is quite a bold statement, I think you forgot the phrase "though I haven't tested any of the others, but in my opinon"

 

[quote=stevecars60;1199397]No not at all, I'm sure that I'll get around to owning and testing one, one day there's one thing I like to do is test.

I would even like to test Don's cyl head one day

The 1/4mile times posted are with a stock header stock cat and stock Cooper S exhaust which has been one balled and makes 306 flywheel horsepower with the nitrous, it even has a stock ecu stock cam stock head stock pistons stock pulley

 

Websters car is stock, all stock. 100hp worth of No2, in most cases, is not enough to shave 2+ seconds ( on street tires or drag radials ).

 

[quote=Paul Webster;1199419]You da man I have a 66 Spitfire with mods & I run mid 12s on true slicks. About 250 hp with the bottle but the car only weighs 1400#, so... you win. You beat me to the last post. I got a pm detailing your car while you were posting.
I'm impressed

 

the three that come to mind are pipe diameter, primary length, and collector shape. And because of space, no one really has long enough primaries. But there's a price to be paid... I think the STahl is longer than stock, so you can't just bolt up any cat-back to it. All of the other manufacturers constrained themselves to something that can drop into the same space as the stock manifold....

Matt

 

Sure did...port matching is a must...

https://www.northamericanmotoring.co...68#post1199468

 

Actualy there are maybe 4 real performance headers & the price is very high. You are right about the primary length, too short. As far as I know all the street headers are as you describe, as are the exhaust systems, cat back.

The Stahl, has longer primarys & differing diameters to suit your application. The only drawback is mateing to your cat back, this is also true with the JCW race header, made by several, again big $$$$. On the other hand you could install the Stahl system & be done with it ( my guess the least expensive of the top tier solutions - still $$$$$ ).

 

Bold and correct. I have tested four of the ones I mentioned both on the track and on the dyno.
All of the headers except the Stahl gave very similar results probably because they all share the same basic flange and primary dimensions.
Maybe you’re not familiar with Stahl or what they do. That’s ok; go to http://stahlheaders.com/ and check it out. The differences are numerous and include flange design & shape, primary diameter & length, formed verses merger collector, material, and manufacturing technique.

 

Thought this was the, Heads...a discussion thread.

 

You're right I'll move to the headers section

 

header bone...
And the header bone is connected to the cat bone...

I'm sure it's the 16 oz Rum and Coke that made that seem funny to me...

Matt

 

[quote=stevecars60;1199426]I think its more impressive getting a Spitfire to run 12's is that with the original engine / rear suspension?

Making the Mini run 12s was so easy my kids could do it

 

[quote=Paul Webster;1200516]It was not easy. 1500 w/ Crower rods, J&E pistons, head, 2 - 40 DCOEs, TT header, solid MM, Cam can't remember the #s, lightened - knifed 1300 crank, 4 quart oil pan w/ tray & doors, all the other usual - balaence etc., 10,000 clutch ( don't know if they are still made ), Detroit Locker, lots of mods to the rear suspension ( late model MK4 ). There's more. The last time I ran it was in 2001. The fuel was C12 . I got maried in this car 35 years ago & I have done it over - 3 times since 1968. It's a killer street car....... I tell everybody it's stock I'll need to revive it someday... before I'm 70

 

[quote=stevecars60;1200831]
done the marriage 3 times over or the car?



kidding of course!

Sounds like a great car

 

[quote=isellem;1201045]Same wife

Same car

Just a lot older

 

[QUOTE=stevecars60;1201593]
Too bad you can't by repop people body parts. I could use a few.