Engine Build-Up

[Jim Shepard]

I'm posting this on the car side because I figure there's more experience here hot-rodding these L-head motors. Here's my question(s). Given a 230 out of a '54 one-ton and an intense desire (obsession?) to put three single throat B&B's on it, what are my engine build considerations? I'm planning on boring it .060 over and getting a 3/4 cam. Also balancing everything. Is that enough?

[greg g]

Good valve job some new springs, check with Don C about what he used in his Desoto engine. With all that carburetion I would think you would also want to increase the CR by milling the head and decking the block. Could give some thought to lighteing the flywheel. Split exhaust will heol it breath, crossdrilling the crank will give it some more oil flow to the crank. There has been some discussion about opening and polishing the block to match the gasket openings. Pro and con on this. Also there was a suggestion of smoothing or bullnosing the ramp in the combustion chamber where the gasses flow from and to the valves.

On the HAMB board there is a fellow trying to build a 200 HP MOPAR L head. Start reading here.

A concern for a triple set up is the space between the carbs, and having enough to get the fuel lines in between. Guess you could mount them so that the float bowls are facing sidways but in the normal position, its even a bit tight on most dual manifolds.

Check out member MOOSE, perhaps he can make something up for you for a triple.

Keep us posted on your build.

http://www.jalopyjournal.com/forum/showthread.php?t=238372&page=5

[Jim Shepard]

Thanks Greg. I had already thought about the cast iron headers and dual exhaust. I've alredy purchased a couple of Smittys mufflers. Since I'm going to have to fab an intake manifold I had already decided to mount the carbs sideways with the gas lines coming in from the side. I think this arrangement will actually make the linkage go together a little easier.

[Don Coatney]

Contact George Asche. A phone call will be required as he does not do

internet. His phone number is in the links section of the main page

supporting this forum. A picture of the work George does is below. I am

using a dual manifold that he modified for me. I have bored my engine .030",

milled the head, sent my cam to Earl Edgerton for a re-grind (260 duration

@ .410" lift), installed a dual point distributor, and a few other things I dont

recall at the moment. Biggest thing you need to do is either add an

overdrive transmission, or lower differential gears, or both. I have done both.

[wayfarer]

George's phone number is 814-354-2621.

.

[Jim Shepard]

Does anyone here know the cfm of a Carter B&B?

[greg g]

Found numbers from the comparable Rochester single throat carb is aproximately 250 cfm. I believe the Carter should be about the same as the needs of the engines they feed are similar. Remember when you use multible carbs, the cfm through each carb is actually reduced.

Edited May 7, 2009 by greg g

[Jim Shepard]

So, is there a accepted "ratio" or some other formula that says so many cfm's per cubic inch?

[greg g]

Here is acalculator fo how much flow your engine can produce, but as far as finding specific flow info on the carter can't seem to find any.

http://www.usaimports.co.uk/Carb_Calculator.htm

[greg g]

found the umbers for the bbs carb the single barrel used on the 53/4 and later flat 6, and the bbr/d 2bbl used on the 56 optional flat 6 intake.

bbs and the b 1 b have gotta be farily close

Carter BBS ~ 141 ~ 200

Carter BBD (/6 model) ~ 202 ~ 285

[greg g]

Check here for some good info.