Brian,
I expect that Bob Lang will disagree with me (and Bob does know his stuff),
but "Kas" Kastener does advise that the stock header is "good enough" except
for the very dedicated track racer. Most people do not rev their TR6 motor
above 5,000 rpm, so I do not think you will see any difference at all with
headers (though it WILL sound better, which translates into more
smiles-per-hour!).
In an earlier email, Bob suggests that a stock motor, sans mechanical fan
and headers, could gain an increase of 16 hp. I figure that 1 hp for the
TR6 motor costs $100, so to get 16 hp, you would need to spend $1600, which
is clearly a lot more than a header and electrical fan alone.
My stock motor with K&N filters, electronic ignition, rebuilt and re-bushed
carbs (which ran a near-perfect A/F ratio profile), open-exhaust and no
mechanical fan, pulled 91 rwhp on the dyno (please see
http://triumph.hottr6.com/tr6dyno.html for details).
Cheers,
Shane Ingate in Maryland
On 10/3/02 15:36, "Brian Finck" <brian.finck@powerhouse.ca> wrote:
> Hey Guys,
>
> I like the look and sound of my stock exhaust system, but would not be
> opposed to a little more power. My engine is in stock trim, nothing with
> stock exhaust. Would retaining the stock muffler set up totally defeat the
> effects a good header. I am totally aware that a properly tune exhaust,
> along with head work, cam, carburetion, etc, etc, is the best way to make
> really good power, but, would a good header, with the stock exhaust be worth
> spending money on, or would the increase be too small to bother with?
>
> Brian Finck
> '75 BRG TR6
>
> -----Original Message-----
> From: Robert M. Lang [mailto:lang@isis.mit.edu]
> Sent: Thursday, October 03, 2002 2:05 PM
> To: Shane Ingate
> Cc: 6 Pack
> Subject: Re: TRF headers [was "Magic Clutch" Kit by TRF]
>
> On Thu, 3 Oct 2002, Shane Ingate wrote:
>
>
> [stuff deleted]
>
>> The Group 44 headers move the powerband significantly to higher rpm than
>> other headers currently available. I suspect that the builders of the
> repro
>> knew this, and attempted to shift the power-band to lower revs by using a
>> 1 7/8" collector. I have this system, and I believe it works as intended,
>> but in my mind it does negate the advantages of using 1 1/2" tubing. I do
>> not have any dyno information to support this statement.
>
> This is why some of us re-work the collector on the secondary pipes to get
> 2.5" pipes all the way to the back of the car.
>
> There's nothing wrong with power at 6000 RPMs.
>
> :-)
>
>> On a near-stock or mild motor, I doubt if you will notice any difference
> in
>> power over a cheaper header, but with a built motor and revised collector,
> I
>> would expect to see significant difference on the dyno.
>
> Au contriare! A good header on a stock motor will yield power increases,
> but these turn out to be at the upper range of the power curve.
>
> Remember a Fed. Spec TR6 is roughly 100 HP in stock form. Make it breathe
> better and get rid of the fan and you're in the 120 HP range easily. The
> header is probably the most important part of that equation. Throw on
> Webers and a header and tuned exhaust and you can get that number into the
> 130 HP range.
>
>> Shane Ingate in Maryland
>
> rml in Boston
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