235 intake questions...driveabilty vs. hp gains

Ok boys, I have a 235 on the stand. I currently have a 2x1 offy intake on it with split Fentons. Pretty much the typical setup.

Now I have the original intake as well with a single. I know the dual looks cooler but on a daily what can I expect to be a better driver? Is the power that much greater on a 2x1? This motor is brand new and never been fired.So I really don't know what to expect.

I have never had multi carbs so this is all new to me.

Thanks

 

I HOPE there is some inprovement on your 2x1 intake compared to my SINGLE 1 barrel. I would give it a shot, and it definatley doesn't seem hard to dial in 2- 1 barrels like it would be to dial in 2- 4 barrels.

It should have a bit more "go" than mine and as for fuel economy I've only put $10 in gas into my '59 235 in the last month or so!!

If you want I'll trade you my single set-up for yours!!

Good luck,
~j

 

Run the dual carbs, it will be fine.

 

Been running with mine for nearly 3 years now. Summer,Winter,runs great. Haven't had a bit of problems with 'em.

 

One thing you can think about root, is that 6 cylinders are often grossly under carbed. If you think of a six of 235 c.i. and a theorectical V-8 of the same displacement...the six is going to need more "carburator" than the 8. With each intake of a piston, the six pulls more than an 8 ( cubic inches divided by # of cylinders = more c.i. per cylinder). All this leads up to the fact that you would see a bigger power and efficiency increase by putting 2 ones on a six than you would on a V8 of the same displacement. If you think of it like that, would you even consider using a single one barrel on a 235 cubic inch V8?

 

...also, don't worry about progressive linkage with 2 ones, it will run better with straight linkage...

 

if you are worried about keeping 2 1bbls tuned, why not use a single 2bbl? The adapter is only $15.

 

Root go with 2x1,I had one on a 54 Chevy pu made a big difference in the power and not a real big difference in gas mileage. It started and ran good when cold.

 

How did you wire up the choke? Did you just choke one of em? Did ya have heat on the carbs?

 

Root, my experience is that both carbs have to be IDENTICAL. By that I mean the jets, the bases, the metering rods and the fuel pumpers. I know a lot of people are against the heated manifold but I noticed an immediate jump in fuel mileage and driveability after installing mine. Some guy on e-bay sells 'em for cheap. I get 15-20 mpg out of my '54, it ain't as economical as a Honda Accord, but what the hey?
Good luck.

 

I have a 235 with offy intake and (2) 2brl holley weber progressives. Starts instantly. Very noticeable improvement power wise over the original single. Can't speak for gas mileage as I never checked it and the truck in pieces right now.

From everything I have heard and read you only need to choke one carb and just wire the choke open on the other carb. That is what I did and it worked great and started fine in 30-40 degree weather. To be honest I think it would work fine without a choke but might as well have one.

As far as heating the manifold I used the water heating plate that Stovebolt Engine Co sells. You could easily make one. Supposedly you HAVE to heat the manifold on inlines for street use or you will have poor atomization and waste fuel because it will be too cold when entering the chamber.

 

Nads is exactly right about the carbs being identical because of the way the fuel is distributed in the intake manifold. As far as chokes go, one is fine. Its good to have a heated intake for the atomization issue, but you should run would or polymer spacers to help prevent vapor lock.

 

im running the same set up u have. i dont use a choke and i started mine up with 3 pump on the pedal this morning. o and it was 15 degrees out. i dont know what the power diff is cause ive onley had it with the dual carbs. im running a strait bar linkage. works great and have had no problems. i say run the dual one barrels!

 

I have a brand new carb or at least a reman. I hate carbs so it was worth the 85 bux to have one that is supposed to be ready to go. I may just take the plunge and buy the other one new.

Since, I have had a hard time selling the car as a project...I may finish it. But, then it won't be a $2800 car anymore.

 

Dual carbs (remanned) straight out of the boxes.
Straight linkage, choke hooked up to back carb.
Non water heated manifold.
Pull choke, give a couple pumps and she fires right up.
You have to let it warm up for a couple minutes, cause of the lack of manifold heat.
Drives great, makes good power and p***es Aircare!

 

What kind of oil fittings and hoses are you running? Thse things look huge....I have basically what you do there in the pic, as far as carbs etc. I still haven't figured out that Offy linkage yet. I will probably wait til it's back in the car for that.

 

[ QUOTE ]
Dual carbs (remanned) straight out of the boxes.
Straight linkage, choke hooked up to back carb.
Non water heated manifold.
Pull choke, give a couple pumps and she fires right up.
You have to let it warm up for a couple minutes, cause of the lack of manifold heat.
Drives great, makes good power and p***es Aircare!




[/ QUOTE ]

You do have "HEAT" the exhaust manifold is bolted right to the intake, so you have heat.

Billy

 

Actually the manifolds are not bolted together, there is a gap of about3/8 of an inch.
Root, you like those oil lines?
They go to this little gem I tucked behind the splash pan.

 

tell me more......

 

When I built that motor, I tapped out those oil gallery holes to 3/4". Inside the block I plugged off on of the oil galleries. Now all the oil comes out of the pump, through that tube that bolts to the pump and then into that big oil line. It gets filtered then goes back to the motor.
It's one of those oil filter relocation kits from TransDapt, cost like 100 bux!

 

too late for me....