Maybe I should clarify what I had posted.
Lawrie did some anicdotal testing and found that the stock
filters with the alloy adapters worked best. In his tests, as
I recall, they didn't use the alloy adapters or any ram pipes on
any of the aftermarket filters.
The chicagoland website (in pictures), you'll find a dual carb
conversion. There, they mention that the alloy adapters work great
as mini ram pipes. They counter sink them so it's flush and can do
uni-syn tuning without removing them. Cool idea.
So my statement is that the stock adapters will work like ram pipes.
Maybe, not as well, but the same sort of function.
A question I have on the tapered K&N filters. Do those fit on RRB
converted cars, without shimming the engine mounts? I have put a dent
in my foam filter for it to miss the brake booster.
On to Grassroots. It became my favorite car magazine, 2 or 3 years ago.
I recommend it highly. They are also the new owners of 'Classic
Motorsports' nee 'British Car'. I got the first issue of that, and
didn't much care for it.
I dropped Road & Track back 2-3 years ago, as Egan was the only thing
worth reading in it. And maybe a tech tidbit every third month. I
resently dropped Autoweek, mostly because I had trouble keeping up. My
subscription ran out in July, I got uncountable re-subscribe letters,
and at least a couple of covers over the magazine saying times almost
up. The last issue in July came with a cover announcing that was my
last issue.
It still comes to my house. I've got 6-8 more issues. If I'd known I
wasn't really going to get cancelled, I'd have dropped them long ago. :-)
Back to the article on dyno-tuning. The exhaust part said, the stock
system is good. The stainless steel is good in every respect (fit,
looks, long lasting) except it looses one horsepower to the stock.
It goes on to say that most aftermarket headers are cheap, thin and
badly designed, stealing horsepower. The Paeco is an exception. It
increased hp by 2 at around 3000, and by 1 at the top end. It had
fitting issues, they had to heat it up and bend it into fit. Plus it
was thinner than the intake manifold.
I'll have to re-read the whole article, now that I have the HIFs on.
If anyone is interested. GRM will send a free issue to you if you sign
up on their web page. You can also order back issues. This tuning issue
is Volume 20, Number 1. February 2003.
Paul.
ATWEDITOR@aol.com wrote:
> In a message dated 9/10/03 10:32:32 PM, mmorris@nemr.net writes:
>
> << Jay,
>
> What is a stub stack and where do you find them? >>
>
> Monte,
> Go to http://www.aptfast.com/Main_Index_Page.htm, and scroll down to SU Stub
> Stacks & Ram Pipes. I have a '72, so with HIF4s I needed HS4 stub stacks.
> Stub stacks are amazingly small--for lack of a better word--plates that mount
>on
> the mouth of the carb, using existing holes, a screw-on application. Their
> rounded opening apparently increases the flow of air into the carb. And the
> K&Ns supply that air.
> It has been stated that another lister has done testing and found that the
> stock filter assemblies, with a bottom plate that serves the same function as
>a
> stub stack, works best. I relied on the extensive dyno testing that
> Grassroots Motorsports did on an a late-model MGB converted to SUs, comparing
>new
> things to stock, and they made strong recommendations for K&Ns and stub
>stacks.
> They did not, however, find much benefit to most exotic exhaust systems and
> headers, saying the original MG system, and especially the head pipes,
>already do
> a fine job of extraction. And as I said, my experience swapping from clean
> stock filters to K&Ns and stub stacks, has been very exciting. The stacks fit
> under the K&Ns with so much clearance I find myself wondering if the short
> velocity stacks would fit, too, and if that would bring any additional
>benefit.
> However, I'm well satisfied with what I've got now.
> In passing, I find the folks at APT to be VERY responsive. I originally
> ordered the wrong stack. A guy at APT noted the mis-match between my K&N
>order
> and stack selection and e-mailed, and then called, to straighten me out and
>get
> me the right stuff. That is exceptional service.
>
> Jay Donoghue
> 72B-GT
> 66 Mustang
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