New/Modified Header Design?

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Daryl Smith
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Re: New/Modified Header Design?

Post by Daryl Smith »

SpeedTalk discussion on the 'Bashed Header' Video...
http://speedtalk.com/forum/viewtopic.php?f=1&t=45411
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Re: New/Modified Header Design?

Post by Daryl Smith »

This chart was linked in a Speedtalk thread on header sizing, thought someone here might find it interesting....
http://www.coneeng.com/pdf/Area_Calculation_Table.pdf

Might want to print a copy, as these things on the internet tend to disappear.....sometimes rather quickly....
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CameronSF
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This has got to be the longest running thread ever...

Post by CameronSF »

With that being said...there is a lot of info in here but just wondering if there was any consensus among the experienced members here. I've read the original exhaust manifold was good and not worth replacing and then I've read the exact opposite. I pulled my head after dropping a valve seat and now would be the time to install headers if it made sense. Datsun Parts is saying they do not have any more in stock from their manufacturer and do not think they will get any more. Has anyone had any luck with datsunroadster.com or tri-mil.com headers? On a side note - I saw some comments about exhaust velocity earlier here and Dave at Rebello confirmed the exhaust ports on the U20 head do not create the optimal velocity. He recommended installing smaller exhaust valve seats which made significantly more power than the original spec seats.
- Cameron
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Re: New/Modified Header Design?

Post by SLOroadster »

I have the Tri-Mil headers, the large ones. They seem to be ok, nothing special, but they work.

Will
Sorry, I find modern engine swaps revolting. Keep your G, R, or U series in your Roadster!
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Re: New/Modified Header Design?

Post by CameronSF »

How was the fitment Will? Any other input? Heat, noise etc? TIA.
- Cameron
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1970 2000 SRL311 #13184
1990 300ZXTT
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2000 Crown Vic 'Queen Vic' 24 Hours of Lemons ' racecar'
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Re: New/Modified Header Design?

Post by Daryl Smith »

Interesting youtube video on exhaust scavenging:


A lot of info here and a couple videos also:
http://garage.grumpysperformance.com/in ... esign.185/
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Re: New/Modified Header Design?

Post by Daryl Smith »

Have been unable to repost pics of the 4-2-1 header I'm using....I can forward pics to anyone who would like them...
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Re: New/Modified Header Design?

Post by Solex68 »

Forward them to me and I will post them for you.
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Re: New/Modified Header Design?

Post by Solex68 »

Here is Daryl's pictures...Click on photos to see larger!
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20180701_175357.jpg
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20180701_175457.jpg
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20180701_175556.jpg
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spl310
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Re: New/Modified Header Design?

Post by spl310 »

Looks nice. Did it improve torque?
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Re: New/Modified Header Design?

Post by Solex68 »

We need an engine with Solexes to mount this and then the Tri Mil header and compare on the dyno.
Greg a.k.a SOLEX68 - http://www.datsunvents.com/
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Re: New/Modified Header Design?

Post by Daryl Smith »

Sid,

I used it on my 1800cc stroker (specs in the stroker thread). I couldn't say if it improved torque as I don't remember the before....but, the engine did perform well. Would pull from 1500 rpm in 5th.
Best comment was from JT saying it performed like a well tuned SU U20. Not bad for 1800cc pushrod engine....

It also gives a little more clearance around the starter....
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spl310
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Re: New/Modified Header Design?

Post by spl310 »

The old Bob Sharp manual spoke to the Tri Y as being a good header design. It looked a lot like that one. I put Tri Y headers on a 289 Ford years ago, and liked them much better than the full length tubes.
"Wow, a Roadster!" Stuart Little

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1967.5 2000
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1995 F350 Powerstroke!
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Re: New/Modified Header Design?

Post by Daryl Smith »

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.
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Re: New/Modified Header Design?

Post by Linda »

This thread has 55 posts and started Feb 2005. :shock:
Glad to see you designed the part you are satisfied with! :)
Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
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