The Stovebolt Site Forums The Shop Area Engine Shop Single Holley Weber Setup

Hey guys.. Here is my dilemma. I am working on my 57 Chevy 210 Sedan (sorry to use the forum, but this is the best forum for this engine). Anyways, I just installed the T5 and it was a great improvement over the old 3 speed. The car loves overdrive.. Anyways, the other part of my investment into this car was changing out the original smelly, leaky Rochester single and go to a single Holley Weber from Langdon. I got everything changed out and hooked up as it should, but the car feels like it has about 50 horsepower less than it did with the original setup. The only mod I have with the engine are tube headers and pertronix in the distributor, which I did a long time ago. I now have hesitation on acceleration and a lack of power. Is one carb not enough. I was told that this was pretty good out of the box with no adjustment. What can I do without spending a lot of money? I am really disappointed in the product....

That is a progressive 2 barrel carb. Make sure the secondary is opening. If the choke does not open all the way the sec. won't open. Make sure the accel. pump is working good. You may need a larger main jet. I've never used one on an old truck or car but the Pinto's & Mustang 4 cyl. engines used them & they were hard to get right then, but that was mostly from the auto trans. & A/C. They didn't have enough power to run the car & A/C at the same time.

I verified the secondary is opening and the choke adjustment is good (opens all the way at operating temp). What CFM is the Holley/Weber? If it's for a 4 cylinder, maybe I chose the wrong setup? Does it have less CFMs than the original Rochester? I'm hoping it's just a tuning issue but don't know for sure or where to start.

It seems to me if two of them are right for a 235, one would not be enough.

I recently switched from a single barrel rochestor to a weber 38 dges carb. I have no complaints. It is synchronous opening 2 barrel carb. I have a 235 with fenton headers and a gm electronic dist. Im also running a t-5. this might be a carb you might consider.

Call Langdon if He sold You the carb,He'll help in getting it setup.

Pete

There are many folks running one of them satisfactorly. They have more than enough CFM to do the job and it's more than the Rochester. I agree with Pete, call Tom Langdon and talk to him. He knows these carbs well.

I appreciate the advice. I was hoping that it was just a setup issue.. maybe jetting. I'll call Tom tomorrow and advise of what he says. Thanks guys!

Well.. I talked to Tom. He said that I may have some dirt or something in one of the jets. That is the stumbling issue.. As for the power issue, he said that running one Holley/Weber won't give you the power that a single Rochester 1 barrel will have. He said that you are running off of the primary most of the time which is half the CFM as my Rochester. This all makes sense now, but when I was originally going to run the setup, he told me that even a single Holley/Weber would be an improvement over the original 1 barrel. I'm dissappointed that he would tell me that and then tell me about the power loss after I made the purchase.

I'm going to check the jets tonight. Maybe that'll clear the hesitation up... But if the power doesn't improve, I'm going to have to go with something else.. Maybe back to the Rochester..

I think what he originally was referring to is that if you go to WOT it is a lot more carb than the Rochester and that is certainly what I meant. I run a pair of them so I don't have the same problem as you but it runs very well. I guess it is all in the interpretation but I don't think he would intentionally mislead you. Did he say anything about rejetting to larger jets?

I've heard a few others say the same thing,a single H/W has less part throttle power than the single barrel,but usually more power when wide open.I believe that the seller of these carbs does does not tell customers that unless they ask him directly.
I guess you may have not gotten exactly what you wanted.

If You're going to change carbs again get your self a Carter and get rid of that model B rochester ,I've got a 52-3100 with a stock 216 in it and played around with two "B" models and finaly bought 2 W1 carters from one of the guys here on the Bolt ,rebuilt one and would never run a "B" again the engine runs very strong and very steady with NO hesatation,starts right up NO problems at all.


Looks good too!!!


Pete

Moneypit~ No, I don't think that Tom deliberately mislead me, but I didn't get a key piece of information about power until after I bought it.. Regardless, I don't hold anyone accountable other than myself. I guess I should've figured that one out.

Anyways, I checked the carburetor out last night and couldn't find any dirt, etc in there. I wrote down the jet sizes and they are as follows:

Pri Idle - 65 Sec Idle - 50
Pri Main - 137 Sec Main - 180
Pri Air - 190 Sec Air - 180

I also checked my plugs and after only about 40 miles, they are white tipped, so obviously I am running lean. Where do you buy jets for these things and what sizes are recommended for a baseline so I don't spend a small fortune on jets? Can I run a certain sized drill bit through some and same some money?

Pete52~ If I can't get satisfactory results from the H/W, I may switch to the YF. My concern would be if the YF matches my current Rochester B in CFM. I have plenty of power with the original setup, it just runs too rich and leaks and stinks... My 1957 235 probably needs a little more that your 52 216. Did they make a YF for later engines or were they all the same?

A Carter YF 2100S should be the one.I just installed the YF2100S on a 235,better performance especialy throttle response,smoother idle,doesn't leak fuel.It was a direct bolt on to replace a Rochester B,the aircleaner even fits properly.And the YF isn't turd ugly on a vintage engine like those nasty looking HW's

Smokinjoe3 - I'd suggest you send a private e-mail to "carbking" who is one of our regular contributors and from what I can discern is very knowledgable on all brands. I'm sure he can offer advice on proper jet sizes and where they may be obtained.

Search the userlist at the top of this forum for his e-mail.

Not to belabor this too much, but I wonder if the progressive nature of the throttle on the H-W might be causing this issue. Consider this chart. At part throttle, the single barrel Rochester has a larger throttle area than the H-W, then as the secondary throttle plate opens at higher settings, the H-W has a larger area.
I expect this would cause the H-W to feel a little soft at cruise, but be equivalent at WOT.

I've not driven one - I sold the truck I put an H-W on before I go a chance.

regards,
Leon

Hey Joe, any update on this? I bought the same carb from Tom for my 230 and am experiencing the exact same issue. Engine has no power and shows signs of running lean. My jet sizes are the same as that carb you got as well.

wondering if I should mess with re-jetting or just get a different carb?

i have the same setup on my 46 2 ton
it has a rebuilt 1960 235 bored .080 over
and it supplies plenty of fuel. i have an hei ignition in mine. i would monkey with the timing mine likes the timing advanced
a little also you want a short quick throttle
setup not a long slow one that gets the secondary open quicker. philip