adf vs. dfev

[royce71]

I am trying to make up my mind between the adf and the dfev. I already have an 1800 manifold. Any suggeestions would be appreciated. Otherwise my engine is a stock 2L.

[mbouse]

what do you want, need, or anticipate from a change in carburetor?

and, have you plans, or have you already modified the exhaust, and to what extent?

[So Cal Mark]

I really like the 32/36 dfev. Are new adfa's available?

[royce71]

It already has a 4-2-1 and I am thinking of ditching the cat, or at least getting a new one. I am only looking for moderate performance improvements for now. I did come across a 34 adf at this site http://www.alamomotorsports.com/weber/fiat_carb.html , does anybody have experience with them?

[So Cal Mark]

I wonder how old that page is. I buy from Redline and they haven't had those kit numbers for years

[Torxx]

My experience with Alamo, was that they didn't have the 32/36 carb in stock and kept extending the anticipated ship date. I ended up getting a new 34 ADF. I removed all emissions equip, new exhaust (no Cat) 1800 head. The car was a good running car before, but a definite power jump with changes. We had to do some diag. work when we put all back together, which included putting the original 28/32 carb back in (plugged all the emission locations on the carb). The car runs better on the orig carb. A bit more kick with the 34 adf when you step into it, but the elimination of the emiss. equip, and the addition of the 1800 head, will give the real jump, in my opinion. I was actually amazed at how good teh old carb worked, we bolted up the new water choke to the old carb and it runs like a new car. My guess is the 32/36 dfev with the smaller barrel might the better choice for overall smooth performance, than the 34 ADF.

[royce71]

Thanks for all the input, I think I'ss go with the DFEV.

[mbouse]

other than i neglected to ask in advance about any mods that would be required for the linkage...

my DFEV out of the box was a bolt on fitting replacement in my '80.

i did have to increase the idle speed screw to keep it running after the choke opened up.

i could not be happier with the performance.

keep track of the hoses you leave behind, so you know which ones are to be capped, which ones can be abandoned, and which ones MUST be re-used. they tend to get confusing if you get distracted for a while. digital cameras are so nice for this temporary documentation.

[Torxx]

I should add that i havn't given up on the 34 adf just yet as I just put it on my car. I may be sounding negative before I should. The 34 adf may be a better choice than the 32/36 dfev?? I have no experience with that carb, I did consider it, but, there was an out of stock issue, better price that 34 adf. I like the water choke setup on the adf, mainly because that setup was in place. one less thing to have change or fabricate.. My research led me to believe that the 34 adf is, arguably, the best performance carb option short of dual carbs..

I am still in the adjusting phase with the carb, and am still hoping for great things. I will update if any changes.

take your time reserching before buying, and don't be afraid of making changes in stages, so you can really gage what changes make a notiable diff.

[So Cal Mark]

if you think about the perf ability of each carb, the total bore should be the same; 2 34's and 32/36 each come out to 68 mm. Theoretically, the 32/36 should be give better throttle response at low rpms but at wide open throttle they should both flow the same

[rlux4]

Mark, educate me again. Why would a smaller bore (32) give better throttle response at low RPMs than the larger (34mm) bore? Seems like (if jetting is linear) the larger bore would out perform the smaller.
Ron

[So Cal Mark]

at low engine speeds the air flow rate is slower in a larger bore. As an example, I've put some 38mm synchronous carbs on Spiders. If you put the throttle to the floor at an idle, the rpms pick up very slowly. You have to ease into the throttle until the rpm starts to pick up, then it goes like hell with full throttle

[mbouse]

better and best are relative terms. what is relatively perfect for you, may not be for me.

relative to all the other modifications or changes on the individual engines. relative to the driving habits and desires of the operator(s). relative to the fuel purchased and road conditions.

some of us need to consider ride comfort in addition to out-and-out performance when making our considerations for modifications. I can / will continue to spruce up the responsiveness of my vehicle until just before the point where my wife says "enough". enough changes, the ride isn't comfortable.

the 34 and the 32/36 are very similar pieces of equipment. what you expect from each of them will be only part of the total decision that needs to be made. what else have you already done to your engine, and what else will you be doing to it in the future? and, why? unilaterally saying one is better or is best won't be a true statement for everyone.

[rlux4]

Thanks Mark, that makes sense.
Ron

[royce71]

Thank you for the input, I am in the process of ordering the dfev through webercarbs direct. I was just wondering what height of air cleaner and spacer would be best.