I heard the super six setup helped with gas mileage and power. Do you think this is true?

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Ronnie
http://www.cardomain.com/ride/2714941

I believe this is entirely true, because the long stroke of the slant I believe it pulls a lot more air than originally equated for what a typical six cylinder should take. So the one barrel essentially starves the motor. The horsepower is obvious because you are now putting more fuel into your engine. The gas mileage I would also believe because my Holley was newer, and I think it meant a nice balancing point which is really a key factor in "fuel economy". It takes a certain amount of "power" to drive a certain vehicle for a certain purpose. So this might increase the power a little, but helps drives the vehicle down the road with less strain.

It allows the engine to breathe a bit better, case in point...my 'Beater Valiant' project car always was at 2700 rpms going down I-5 at 65 mph with the Holley 1920... With the Carter BBD 2-barrel, it now turns 2300 down the highway (which is a bit more 'correct' according to the tranny ratio/tire size/ rpm calculator...).

hope that helps if 'mulling over' whether or not to do the super six conversion... once dialed in it's worth it (of course if you get 'bit' by riding in a hi-po slant, you will be in trouble...)



-D.Idiot

Yes and more......Years ago I had a new 77 Volare with the Super Six. On trips it would get 28 mpg, around town it got 24 mpg. There is allot more power with it even though the ratings don't show it. I pulled a 19.5" Reinell fiberglass boat with mine and had no problems. It has loads of torque with the larger exhaust.
Wish I still had mine.

I have a cast iron Super Six manifold, but I am looking for the aluminum version before I make the switch on my 74 Dart.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

I saw a minor improvement in both when I put one on my Dart.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

i agree with DI, my leadfoot got heavier after i put it on, especially once i put on a 2.25 exhaust and a glasspack, i probably didnt have it tuned real good for mileage, but it did ok for as much fun as i had

my 63 wagon got 15 mpg with the 170 (1bbl)and auto trans, i went to super six, 20 mpg now solid, with some tuning mabey more. Oh yea power went way up with the 2 bbl and a 2 1/4 exhaust. It went from night to day, i could hardly keep up with traffic , now no problems! It was a dramatic difference.

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63 valiant v200 Wagon 9.5, Schneider cam, E.I. 22 mpg all day

Uhhh..... Whiskey Tango Foxtrot???

There's no way that changing the carburetor can change the cruising RPM of the engine at a given speed. That is determined only by the tire size, the rear-end gear ratio, and the slippage of the torque convertor. A bigger carb will not make the convertor slip less.

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I got 25 mpg in my 75 duster with my holley 390 four barrel, 3 speed manual, clifford intake and headers (with true dual exhaust) and no other mods.

thats why I am a bit disappointed when I see car commercials bragging about getting 28 mpg in some tiny little fart car.

30+ years and only a 3 mpg gain? what a waste.

Could be something to do with the way the kickdown linkage is adjusted; perhaps it's letting him run in a higher gear.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

sick6,

What size exhaust pipes did you run on your duals?
Did you run a "H" crossover?

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Sorry Ted, I forgot about this post

I didn't use an "H" crossover, they were straight duals with just mufflers approximately under each passenger,and if I remember right the pipes were around 2.25........I have since gutted the system when it rusted out and am saving up for some new headers (among other things..).

the old pipes went over the rear axle on each side, exited just past the bumper. I *think* when I went looking for pipe for over the axle I asked for a 340 duster pipe.........its been quite awhile

You have said it and we do it in SO much more style - we do not drive jelly mold cars - ours was actually styled by someone using a pencil and sliderule

It is quite funny to see people gaping, waving etc when I drive by in the cuda - JUST to hear the say "heavy on fuel hey?" My mom bought a 1.6 VW Polo tiptronic - and it is over a 100KM 2.4 liters heavier than my slant - 8.7 versus 11.1 - if i behave

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Regards,
Fanie Gerber
It's never junk, it's just a part you're not currently using

http://www.valiant50.co.za
Just say I own a few Mopars

NO. He'd be turning around 4000 rpm in 2nd. (assuming a 904 3spd)

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir