plenum for a 38ADL carb???

[coise]

I´m looking for a way to get some cold air into my weber 38ADL or my 34ADF.
Here is what I found, does anybody had some experience with any of these?

http://www.jtoutfitters.com/plenums-web ... 27558.html
http://www.summitracing.com/int/parts/s ... /overview/
http://www.webcon.co.uk/shopexd.asp?id=8939

Any input or idea is welcome.

[bradartigue]

You can run one of those and a hose to the inlet in the front of the car, located to the side of the radiator. I'd be curious to know how it works with it. I assume those things need an air filter in line?

I could see on an FI body with a carburetor running that thing to a stock Bosch airbox. It would provide cooler air and excellent filtration.

[lanciahf]

Your ADL Carb has one of two air filter patterns. Either the same as a Weber DFV or ADF. A plenum for a weber 32/36 dgv will not work.

http://www.mirafiori.com/faq/content/we ... 38_adl.htm

[bradartigue]

Note the comment "the 36 ADL does not have a vacuum port" is incorrect, it is clearly there in the photos.

I forgot about that oval-ish top they used on the ADL - you'd have to machine the intake hat to fit. Probably not worth the effort.

[coise]

I was thinking that, maybe... I could modify the bottom plate of the plenum to make it fit the 38ADL, but as you said it´s probably too difficult. Does anybody has any other ideas or experience with cold air intake?

[pgilling]

Hi Coise,

've used the Webcon Plenum for my 32/36 DGV and it's an excellent solution to help get cool air into my tuned engine. Here is my post on the Guy Croft forum: http://www.guy-croft.com/viewtopic.php? ... 2&start=15
I hope this helps.

Phil G

[lanciahf]

Those are my photos and the port was there but it was not ported vacuum. On another note I did get another 36ADL and that one did have ported vacuum. Maybe there are early versus late editions just like the different tops.

I have also had two 38ADLs and that carb was a powerhouse, yet docile around town.


and the

Note the comment "the 36 ADL does not have a vacuum port" is incorrect, it is clearly there in the photos.

I forgot about that oval-ish top they used on the ADL - you'd have to machine the intake hat to fit. Probably not worth the effort.

[coise]

Thanks Pgilling and lanciahf for the input,
I know that this plenum works with a 32/36DGV , but can I make it work on a 38ADL?
The top of the 38ADL is ovalish, diamandish and I don´t see how to make fit with the webcon plenum.
Any other idea?

[toplessexpat]

I've been mulling this over.

http://www.knfilters.com/racing/plenum. ... 31083&rw=1

Here's a shot of the top from Ralph DeLauretis' article.



I was thinking that the adapter plate would be fairly simple to open up for the top of the ADL. However, it looks like the edge of the diamond will impinge on one side.

Then I came across this:

http://www.jegs.com/i/Turbonetics/880/10351/10002/-1

.. which seems to be equable to the K&N, and about $100 cheaper!

Or this which is cheaper still...

http://www.jegs.com/i/Spectre/865/98499/10002/-1

All of these are going to require an adapter plate to be built - so I think that's where I'm going to focus some energies now. My only concern is that these are quite low profile (and given the ADL is already on a spacer to fit the linkage right I'm not sure a higher hat will work), which means the air hasn't much time to get stable. Trial and error I suspect will prove this one out.

A

[coise]

Let me know how you end up doing it.
The hood clearance for the ADL is actually better than the for the ADF( which is a taller carb) hopefully it will work.
Thanks for the inputs.

[coise]

Toplessespat did you have to reejet your 38ADL in order to make it perform the way you wanted?

I ´m looking for a powerful but drivable carb. My Car is a 1800cc and has a modified head ( valve etc...) high compression pistons, Mark´s ignition system , a 4 -1 exhaust.

Thanks

[toplessexpat]

I didn't - but the setup is VERY fine. Literally a quarter turn and you change the below.

I run about 14.2:1 at idle, then about 13:1 on the first barrel under load, riching to around 11:1 on the second barrel..... When cruising along its about 15:1..... So that's a reasonable trade off I think.

I could rejet - but I'm probably switching to dual 44s.

[coise]

Excuse, my ignorance on the matter and the stupid question that follow. What all theses number mean?
I read in FLU that I should go with 135fuel main and 185air corrector, but what about the secondary Barrel should I keep it as is, or go lower the same amount.
Thanks

[toplessexpat]

It's the air fuel ratio.

14.7 is the stoichiomatic mixture (ie the most efficient). A higher number is leaner and lower richer. Carbs don't keep a perfectly stable mixture - the art is to keep it as close to 14.7 as you can.

FI cars use the ECU to constantly monitor and change the mixture.

You listed the jet sizes - I'll have to go check mike.

A

[coise]

Thanks for the explanation, I feel a little bit less stupid...
Let me know what you have in yours. Mine are 150-160 fuel and 170-200 air with both idle jet at 50.