L20B sniper

[Datsunusa]

I have a 77 620 with a l20b with a weber 32/36 has anybody successfully converted their l20 to efi? I was looking at the holly sniper 2300 really unsure on the bolt patterns. Does anybody know of any of the snipers are compatible?

[datzenmike]

 

This is the Holly 2300 flange dimensions. Compare it to your intake or carburetor base or a gasket. I'm sure the L20B stud pattern is much smaller.

 

BTW the L20 is an earlier 2 liter 6 cylinder engine and why the 2 liter 4 cylinder had to be called B

[Crashtd420]

12 hours ago, Datsunusa said:

I have a 77 620 with a l20b with a weber 32/36 has anybody successfully converted their l20 to efi? I was looking at the holly sniper 2300 really unsure on the bolt patterns. Does anybody know of any of the snipers are compatible?

It's not bolt on but It has been done here, the guy just made an adapter plate out of 1/4 inch aluminum ... 

Print out the Holley pattern then print out the weber pattern, do a little paper engineering and you'll see what it will takes to make the adapter.... 

[iceman510]

I think I may have a datsun  4 cyinder L series manifold for a Holley 2300 carburetor which should fit this directly.  I can look if OP is interested. 

[Stinky]

Sniper also makes a 1bbl, to replace the 1 bble that was on Ford 300-6s.  They also make Rochester 2bbl TBIs.

 

Transdapt makes adapters.  Look at this, then take the PN to the Summit and/or Jegs website.

 

https://www.hedman.com/carb-adapters

 

Here is a sizing chart.

https://www.hedman.com/images/ePIM/original/carburetor-adapter-chart.pdf

 

PN#2040?

Edited November 10, 2022 by Stinky

[Datsunusa]

On 11/9/2022 at 4:48 AM, iceman510 said:

I think I may have a datsun  4 cyinder L series manifold for a Holley 2300 carburetor which should fit this directly.  I can look if OP is interested. 

I am deffanitly interested please let me know what you got

[Datsunusa]

On 11/9/2022 at 9:09 PM, Stinky said:

Sniper also makes a 1bbl, to replace the 1 bble that was on Ford 300-6s.  They also make Rochester 2bbl TBIs.

 

Transdapt makes adapters.  Look at this, then take the PN to the Summit and/or Jegs website.

 

https://www.hedman.com/carb-adapters

 

Here is a sizing chart.

https://www.hedman.com/images/ePIM/original/carburetor-adapter-chart.pdf

 

PN#2040?

Yes thank you very much was having trouble finding a website with correct adapters and it appears that the 2040 is exactly what I need 

[Datsunusa]

It appears that holley has efi sniper 2gc with a flange measuring 3.25 by 1.87 I don't have my truck in front of me can anybody confirm if that's the stock flange measument on the manifold 

[datzenmike]

3.375" X 1.8125" +- Nothing you couldn't use a rat tail file to oval the hole. Don't forget that the L20B manifold holes are only 30 X 34mm and will act like a restriction. Perhaps hog them out as large as you dare.

[Stinky]

$53

https://www.jegs.com/i/Trans-Dapt/969/2040/10002/-1

 

$53

https://www.summitracing.com/parts/trd-2040

 

 

[Datsunusa]

Right on thanks you guys for all the help 

[datzenmike]

Make sure you use some kind of thread locker for the bolts that mount it to the intake.

[Crashtd420]

8 hours ago, Stinky said:

$53

https://www.jegs.com/i/Trans-Dapt/969/2040/10002/-1

 

$53

https://www.summitracing.com/parts/trd-2040

 

 

 

I like that they seem to have more and more adapters available today...

I'd still verify the bolt pattern fits the datsun intake.... even if you have to open the bolt holes a little $53 for the adapter is a good place to start...

[datzenmike]

(3 1/4 in. x 1 7/8 in.) is 3.25 X 1.875 I measured 3.375" X 1.8125" to the center line of the mounting bolts on an L series intake. That's 0.015" X about 0.04" error. (maybe mine The holes in the adapter are going to be larger and this should fit even without any filing.

[Crashtd420]

This is almost making me wanna go back to a stock intake and try this myself..... 

I daily drive mine and would much prefer efi..... 

 

One thing that I can't remember was hood clearance....

That adaptor looks pretty low but the overall height should be verified to make sure it all does fit....

 

The guy I was helping put his 510 into a ditch and ruined the car and I can't remember if he ever got the hood back on to check clearance before that incident ...

 

Edited November 14, 2022 by Crashtd420

[datzenmike]

Check with Holly and see if you can mount a Sniper on it's side. I think it likely that you can if you currently have a side draft.

[Crashtd420]

3 hours ago, datzenmike said:

Check with Holly and see if you can mount a Sniper on it's side. I think it likely that you can if you currently have a side draft.

I believe I looked in to it before and for some reason it's not possible or recommended.... but that was a couple years ago when they first came out..... so who knows.... I suppose its worth checking into again... 

 

But actually, bolting one to a side draft setup might get tricky... because your not feeding a single chamber that gets divided into 4 like the stock intake.... on dual side drafts you have 4 individual runner or if running a single side draft you have 2 to think about.... 

Could be interesting to do ....

 

[datzenmike]

Well if you have dual side drafts I guess you would need two snipers. As long as they have ones that can feed one liter engines and don't need a signal from the distributor.

 

A single side draft sniper should work. There's two barrels for two runners. 

 

In both cases the air not having to make a 90⁰ bend like on a down draft, will make more power.

[ducky]

Did anyone in this thread go forward with this yet? I'm kind of eying the fitech 2bbl deal.

 

For the spacer adapter, you can get one from Holley/Mr. Gasket for half that price above and allegedly still made in usa

https://www.holley.com/products/fuel_systems/carburetor_components/carburetor_gaskets_adapters_and_spacers/adapters_and_spacers/parts/1937MRG

[Stoffregen Motorsports]

Using a Canon manifold with the Weber DGV pattern in it would probably simplify things. Larger plenum too.

[Duncan]

I watched this a long time ago, as I was considering adding EFI to a wagon I had.  I don't remember what engine he had, but thought the OP might want to see this..

 

 

[Crashtd420]

25 minutes ago, Duncan said:

I watched this a long time ago, as I was considering adding EFI to a wagon I had.  I don't remember what engine he had, but thought the OP might want to see this..

 

 

I think that's the video showing he used the cannon intake, like stoffregen mentioned, with a Weber to holley adapter which can be found.... I thought it was mentioned here but I think there is another post with similar information...

[Stoffregen Motorsports]

Two things I really like about the Cannon intake are the larger plenum, which allows better fuel atomization, and the lack of "barrels" in the plenum. It's one big open oval.

 

They are still available too.

https://weberjets.com/product/datsun-l-series-weber-downdraft-manifold-99002-825/

 

If it were me, I'd machine out the plate on the manifold and weld on a new one with the Holley pattern.

[Crashtd420]

18 minutes ago, Stoffregen Motorsports said:

Two things I really like about the Cannon intake are the larger plenum, which allows better fuel atomization, and the lack of "barrels" in the plenum. It's one big open oval.

 

They are still available too.

https://weberjets.com/product/datsun-l-series-weber-downdraft-manifold-99002-825/

 

If it were me, I'd machine out the plate on the manifold and weld on a new one with the Holley pattern.

Pierce manifolds sells them $50 cheaper....

 

https://www.piercemanifolds.com/CANNON_MANIFOLD_99002_825_p/99002.825.htm

 

[Tucson620]

Sorry to hijack, thread sitting a few days.

 

But does anybody know if the above Cannon DGV manifold has a lower carb installed height than a stock Datsun intake + Weber Adapter plate? (3/8" or so)?