L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Engine, Transmission and related drivetrain.
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Woznaldo
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Joined: 06 Jun 2018 21:09

L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Post by Woznaldo » 23 May 2019 02:20

Good Evening fellow 510 freaks,

Does anyone have an accurate technical drawing or CAD file for an L-Series intake manifold flange plate?

I want too make my own custom manifold to run Suzuki GSXR throttle bodies and it would make my start point a lot easier. I’ve taken measurements of an old manifold I have but there’s still a bit of trial and error in getting it right. That said I think I’m pretty close now.

I’ll post up the completed CAD file when completed for all to share.

Woz

datzenmike
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Location: Van. Isle.

Re: L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Post by datzenmike » 23 May 2019 20:43

I don't have a CAD file I just jumped in and made them.

I took a non water cooled U67 intake and cut the flange ends off and traced it out on 1/2" steel and cut out both front and back. Used a 1.5" hole saw on a $50 drill press and a lot of water for coolant in a squeeze bottle. I used steel only because I can weld that well enough or I would have used aluminum.

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1.5" muffler pipe and a miter cut off saw I borrowed.

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Mock up on a spare head this winter

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Had to make an anchor point for the 720 throttle cable I used or it would have hit the hood when closed.

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Turns out the R-1 throttle is only 0.6" radius whereas the 340 Datsun carb is 1.2" so there was only about 1 inch of pedal travel. Quite a bitch if you want to drive t anything below full throttle. I moved the throttle pedal fulcrum point up 1.4" and this lengthens the pedal travel enough, I hope.

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Today it's look something like this, but still several things to sort out. The R-1 carbs cave a coolant passage through them so I'l connect this up. One carburetor leeks so I made gaskets for all four. Have to drill the jets to 1.8mm for an L20B.

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The lack of vacuum is made up for with a GM electric vacuum booster pump.

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"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

Woznaldo
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Joined: 06 Jun 2018 21:09

Re: L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Post by Woznaldo » 24 May 2019 04:39

Wow! Thanks for the comprehensive reply!!

Yep, I could just make it, but I want to make it repeatable for others too. I too have a spare manifold, but cast Aluminium (correct spelling) can sometimes be a bitch to weld, so I thought I’d get flanges water jet cut and then weld on some runners.

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Fred_L-P
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Location: Montreal, Can

Re: L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Post by Fred_L-P » 24 May 2019 05:10

Unfortunately I don't have an L series to scan :|
But I have a 3D laser scanner if anyone is in the Montreal area with a spare manifold. It has a 27 microns accuracy so it should be good enough :wink:

Woznaldo
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Joined: 06 Jun 2018 21:09

Re: L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Post by Woznaldo » 24 May 2019 06:20

Come on guys and girls. Take one for the team!

510rob
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Re: L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Post by 510rob » 24 May 2019 22:02

Fred_L-P wrote:
24 May 2019 05:10
Unfortunately I don't have an L series to scan :|
But I have a 3D laser scanner if anyone is in the Montreal area with a spare manifold. It has a 27 microns accuracy so it should be good enough :wink:
Can you scan any material?

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Fred_L-P
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Location: Montreal, Can

Re: L16/18/20 Intake Manifold Flange Plate - Tech Drawing

Post by Fred_L-P » 24 May 2019 22:37

Pretty much yes, if the surface is too reflective (like a glass or shiny machined surface) there's a lot of "noise" in the scan but nothing some liquid penetrant developer (matte white powder spray) can't fix.

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