twin carbed?

[XFlow_Fairlane]

ok I am picking up this c9 head this weekend and I was playing with ideas for modding it...

1. mill for a single 2v. if I can try to drill for a direct 5200 mount then get a spacer for a 2300 .

2. dual 1100's with center carb blocked off. I have two stock carb spacers I could use and just have linked carbs. easy to fiddle with and all.

3. dual 5200's..got two carbs so I could go this route also

4. tripower. I also got three 1100's I could mount up on this head too.

I might look into getting a length of .5"x4" AL stock for making top plates and just drill and tap a bunch of holes and just have a large top plate for different carb setups that I could interchange. I can use the mills here at school so all that machine work won't cost me a dime.

so am I crazy or does this sound like a sound plan?

nick

 

[61Futura]

Even if you come up with a sound plan, it doesn't mean your not crazy

 

[Hot 6t Falcon]

Nick,

Remember that there is such a thing as TOO much.

The triple carbs will have the most Cruise Night appeal - they also be the hardest to tune and the worst for driviability - except there are some things you can do to help out like progressive linkage so the center carb runs the engine to 2/3 throttle and then the end two start to open -etc.

Two 5200 carbs have built-in progressive linkage.

One 2100 carb is easiest to do.

Do you have a stick? Plans for a cam? headers? 200ci?

I once knew a fella that had SIX stromberg two barrels on his otherwise stock 1955 ford 272ci engine. It was a dog! Latter on, he swaped the 272 for a hot cammed, hi-compression, 312ci and then the carbs worked out pretty darn well. There's a moral there.

P.S. I AM JEALOUS of your school's shop - a milling machine - Dang-nab-it, your school is better than my school!

Good Luck

 

[XFlow_Fairlane]

got access to a tig too.

well right now I have a fresh 200 that I am gonna have milled for 9.5:1 and it is prob getting a 272H cam in it. I have a t5 and bell sitting waiting for this motor.

but I just picked up a tired 250 today with a manual tranny flywheel/clutch on it.

 

[Hot 6t Falcon]

Well, there you have it.

Two H/W carbs are probably TOO much for a tired stock 170.

Two H/W carbs would twinkle on a 200 with a 272 cam and T-5.

Two H/W carbs on a 250 w272 and T-5 would tickle you pink

Build the head for the future plan
Good Luck.

 

[ASMART]

You did not mention if the the HW carbs were the 270 cfm variety or the 235 cfm variety. The 235s would work better if you are going to use dual HWs. If you seperate the front manifold from the back, 2 HW would work better than 2 on the same log. It would in a way act like a dual plane v8 manifold if separated. I have thought of making a plate that would cross the entire length of the log myself. You could then make adapters to fit the plate to mount almost any carb combination you could think of. This would also open up the log to allow a little porting you could not do otherwise. Let us know how it goes.

 

[xctasy]

I've done a considerable research of Twin carbs. Ones that are set up to start the secondaires opening just past maximum torque when cruising are very economical, muc more so tha a single carb.

Twin 32/36's, set to open above the normal cruise speed of 75 mph, will work very well.

The Australian Twin Carb Mazda GLC (323 SS) and related Ford Laser Sport, ran 1.5 litre engines which gave 55 mpg on a straight 60 mph cruise. The Twin Carb was more economical than the stock single carb! The power was higer by only 9%, but it had a higher compression as the chamber filling was better. The car never came on the secondaries until 3400 rpm in fifth, and 3800 rpm in fourth.

The better chamber filling was its main claim. The wetted perimeter is less with twin carbs verses the single carb, and the ignition and compression doesn't have to be compromised to cope with the lean outer cylinders 6 and 1, as all cylinders are fed the same. The heat stove is no longer heating the carb, as each set of carbs is far away from that source, and controlled by an electric choke.

Thirdly, since the carbs are lightly spring loaded, normall operation is light for 90% of the time. When you stand on it, the accelerator pedal gets heavier. On the triple carb Clifford or Offy, the single carb is operative allways, but the two outboard carbs have, collectively, three times the accelerator force.

Either way you look at it, a twin carb set-up is a great idea. Want some TWIN CARB badges? Our Laser S and Sport cars had them!