The tuned header which i have the pattern for is the race header that was
use on the U20 engines.. the tube size should be 1 3/4 inches for a race
engine.... but it must be remembered that you don't get somting for nothing
, while it will increase top rpm HP it will effect the low rpm toruqe that
the motor puts out.... Depends on where you want the power to be best
at..... Yes many put on a lot of performace idems then shift the car at 4000
rpm even before the motor get into it's power band , and then wonder why
there is no perfornce increase . Also you can't simply bolt somthing on a
motor and expext good results, you will have to go into and rebiuld the
motor to work with what ever custom set up you choose to use...
as for paying 550 for a header to increase power , the stock U20 header is
in that range of cost 500+ and it will improve power over the after market
1 1/2 inch tube header....in fact running the whole stock U20 system on a
stock motor will give the best performance, but the total cost is almost
1000.00 bucks now
must remember..... this is the 21 century you don't get much for 1000.00
bucks any more :-)
Mike Kerr
Roadster Restoration
PH# 530-644-6777
Fax # 530-644-7252
Web page WWW.innercite.com/~wolfgang
----- Original Message -----
From: <skippers@mail.clipper.net>
To: <datsun-roadsters@autox.team.net>
Sent: Wednesday, January 10, 2001 1:00 PM
Subject: Re: Header Discussion
> Guys,
> Every once in a while I have to say something about popular notions
> concerning bolt-on performance products. A good overall principle to
> remember is that there is no such thing as a car having a deficiency in
> after-market bolt-on parts.
> A car's ability to perform well is the result of a balanced systematic
> approach. The American approach, "bigger is better," is not an appropriate
> answer to engine performance. Did you know that the majority of Edelbrock
> intake manifolds either degrade performance or do nothing except disable
> vacuum and heat activated fuel metering systems? The optimum small-block
> Chevy exhaust systems uses smaller than stock tubes of uneven lengths and
a
> heavy wrap of heat retaining insulation. Most motorcyle engines require
> restrictive exhaust systems. Even straight-line muscle cars shouldn't
> directly dump exhaust gases (except for show).
> Why spend $550 to buy a questionable 'performance' part that disables your
> heat riser, makes cold running rougher and longer lasting, makes your
> engine block inaccessible from the standing position, and rusts out in a
> predictable schedule?
> Think what spending $550 in small parts and time with your local "super
> tuner" could do. (Look to the people who race Z's. Their teams get much
> more sponsor support than SPL's and they often own foreign car performance
> businesses.) It would be well worth the money in acquired knowledge,
> especially if you were able to develop a systematic approach to further
> performance enhancements.
> Wanna go fast? Nothing flies like a Duc.
>
> Quietly passing,
>
> Ken Spurling
> 1.6L
>
> At 11:01 AM 1/10/01 -0800, you wrote:
> >listing the headers in order of performance from least to best
> >after market 1 1/2 " tube header 225.00 or less
> >stock header 550.00 est
> >tuned 1 3/4 " equal runners header 600.00+
> >
> >Mike Kerr
> >Roadster Restoration
> >PH# 530-644-6777
> >Fax # 530-644-7252
> >Web page WWW.innercite.com/~wolfgang
> >
> >
> >----- Original Message -----
> >From: <jon_wissler@pngc.com>
> >To: <datsun-roadsters@autox.team.net>
> >Sent: Wednesday, January 10, 2001 7:28 AM
> >Subject: Header Discussion
> >
> >
> >> Once again proving my blissfull ignorance, I believed that the
> >> Roadster came equipped either with a standard exhaust manifold OR a
> >> header. My 69 2L has a header, which I once again assumed to be stock
> >> from the factory. I have seen other 69 2L's that appeared to have what
I
> >> would call a "standard" exhaust manifold. That being the case, did
they
> >> in fact come from the factory with headers? If so, are these a decent
> >> header? Are there other aftermarket headers out there, or do you have
to
> >> have one custom made at an exhaust specialty shop? As always, I
apreciate
> >> the collective knowledge of the list in advance.
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