New/Modified Header Design?

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Solex68
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Re: New/Modified Header Design?

Post by Solex68 »

Daryl Smith wrote:
Sun Oct 28, 2018 9:30 pm
Anyone know what happened to the 4-2-1 stainless header that Garm bought years ago? Would be nice to get a couple pictures of that one up too.
1 3/8" - 1 1/2" - 2" iirc.
The guy who had Garm's car last didn't like that header. He said it made the Solexes too hot. He would trade those headers for a stock at the time.
I loved how they looked but I never got a good photo of them even though I tried.
Greg a.k.a SOLEX68 - http://www.datsunvents.com/
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68 2000 U20
Always willing to help another Datsun Roadster owner
Pending installs: SS brake lines, Stan Stealth Dizzy, Denso TT plugs

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Daryl Smith
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Re: New/Modified Header Design?

Post by Daryl Smith »

From the pictures Garm posted I remember that they hung down below what they should have by a couple inches. That would need to be cut back/shortened.
If he has a good heat shield on and is experiencing excess heat I would suspect he is running too lean and or timing needs adjusting....Exhaust should be 1 3/4" with good flow through components...
A good header, one that improves power, WILL require carb adjustments, and possibly timing, to account for more airflow/better filling of the cylinders.
Even tho they are stainless, which is supposed to 'contain' the heat better than regular steel, a good ceramic coating and a proper heat shield would definitely improve things.
I do believe that header is a good design, I would spend the money getting it shortened to the proper height and ceramic coat it.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...

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Daryl Smith
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Re: New/Modified Header Design?

Post by Daryl Smith »

Just came accross this:
https://www.exhaustshop.com.au/products ... 273stm-547

Anyone try a test fit in a roadster?
Last edited by Daryl Smith on Sat Apr 25, 2020 4:10 pm, edited 1 time in total.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...

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Solex68
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Re: New/Modified Header Design?

Post by Solex68 »

Daryl Smith wrote:
Wed Apr 22, 2020 2:10 pm
Just came accross this:
https://www.exhaustshop.com.au/products ... 273stm-547

Anyone try a test fit in a roadster?
Hmmm. Says "Image might not reflect actual exhaust system." I wonder if does look as pictured. If so, I think I would pick one up.
Greg a.k.a SOLEX68 - http://www.datsunvents.com/
Laguna Hills, CA
68 2000 U20
Always willing to help another Datsun Roadster owner
Pending installs: SS brake lines, Stan Stealth Dizzy, Denso TT plugs

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Daryl Smith
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Re: New/Modified Header Design?

Post by Daryl Smith »

Came across some pictures of the Stainless 4-2-1 header I had built for the 1800.....1 3/8"-1 1/2"-2"
By the #'s this should be good for 130 - 140 hp, so, would be a good candidate for an R20 as well....should really boost the low rpm torque.
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Last edited by Daryl Smith on Tue Jun 02, 2020 7:36 pm, edited 2 times in total.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...

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Daryl Smith
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Re: New/Modified Header Design?

Post by Daryl Smith »

Some more....It looks good, but I was unhappy with some of the welding and decided not to accept it. Garm bought it for his car, and where it is now is anyone's guess...
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Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...

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Alvin
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Re: New/Modified Header Design?

Post by Alvin »

R16/stroker extractors from Lou:
Image
Image
Image
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Daryl Smith
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Re: New/Modified Header Design?

Post by Daryl Smith »

How about some #'s there Alvin? Primary, secondary, and collector diameters?
Looks good, but, were'nt these made for the 2.3 L stroker @ about 190 hp?
Way overkill for the 1800 and 2000cc strokers @ 100 - 140 hp where most will end up.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...

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Daryl Smith
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Re: New/Modified Header Design?

Post by Daryl Smith »

Some very interesting reading in this thread....might have to consider downsizing my current header..... :shock:

10 pages long and you have to sign in to read it.
https://www.speed-talk.com/forum/viewto ... 15&t=55767

hoffman900 wrote:
"Calvin built a system for a friend of mine and is pushing over 75hp/cyl through 1 3/8" od tubing for the first 10" off the head (4cyl). So more peak than your BDA and I bet the power curve was muuucch smoother. The engine also needed two sizes less jet (Weber) with Calvin's system as the depression across the jet was greater. "
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...