On the flat head sixes all I see are two one barrel intake manifolds is that just for the wow factor or is it better than a two barrel carb set up. What would be the rule of thumb as per cfm on a stock 170 with headers or a 185 with headers? I'd like to put a two barrel on my stock 170 for now. I have a couple of Stromberg 2 barrels that would work as far as linkage etc. any ideas?
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Two barrel carb vs. two one barrels
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I'd like to put a two barrel on my stock 170 for now.
A bit OT, but the best carburetion setup I ever did for the Champion was three SU sidedraft carbs as used on the MG engines. The manifold stubs were easily made from exhaust tubing and they really worked. Today, I'd probably go with motorcycle carbs.
jack vinesPackardV8
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Take a look at these two albums for ideas.
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In the first album there is a four barrel Holley, based on a Weber design, that I ran on my OHV six and the second album was a Holley 1940 single I had on a 170 Flathead.
I tried singles, two barrel, progressive two barrels, and four barrel carbs on my six cylinder engines.
The biggest hurdle is what jack mentioned about trying to get the air needed for the larger carbs to work efficiently and effectively through the small single sized manifold.
The best compromise I found was the Holley 1940 single. It was a smooth and more powerful setup. I could never get the progressive two barrel to work right and the four barrel was a blast on the OHV six. Down low it hesitated just a bit so I had to give it a few more RPM than normal but once pat that it was so good I never took it off.
Food for thought.
Len.
P.S. What Jack said about the triple side draft motorcycle carbs is the ultimate setup. I just didn't have the money to put it together but it would have been the bees knees.
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Another thing with the triple motorcycle (or SU) carbs: you could put them on tuned ram tubes. Look at the length of the intake runners on modern multi-port EFI engines. They use those long runners because a mass of air that size has inertia, and once moving, tends to keep moving. This ram effect works best at lower speeds, and really boosts your torque.Gord Richmond, within Weasel range of the Alberta Badlands
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What about using the carburetor from a Commander six?RadioRoy, specializing in AM/FM conversions with auxiliary inputs for iPod/satellite/CD player. In the old car radio business since 1985.
10G-C1 - 51 Champion starlight coupe
4H-K5 - 53 Commander starliner hardtop
5H-D5 - 54 Commander Conestoga wagon
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The most I'm expecting out of the 170 is drive ability so I can keep up with traffic safely at 65 plus mph. The altitude is about 4600 ft so more air into the intake the better. I've always wondered about choking off the intake with adapters so the two carb system makes sense. Being a true CASO I plan to make my own intake and exhaust manifolds so I'm leaning towards the two carb system. We have a motorcycle wrecking yard here maybe I'll go bend their ears a little. Thanks for the input good points to consider.
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Keihin or Mikuni carbs can be used for your 170 like in the link below, especially if you can get them cheap.
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If you go for two carbs, be sure to design the linkage and set them up properly. I have never seen a home made dual linkage setup that worked properly. Don't forget the choke system.RadioRoy, specializing in AM/FM conversions with auxiliary inputs for iPod/satellite/CD player. In the old car radio business since 1985.
10G-C1 - 51 Champion starlight coupe
4H-K5 - 53 Commander starliner hardtop
5H-D5 - 54 Commander Conestoga wagon
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Originally posted by LeoH View PostWhere did you get those manifolds Skybolt? They are pretty.
All the adapter and spacers were bought on eBay and modified to suit. I did however make a spacer out of phenolic to enable the use of a PCV valve on the Champion six.
Len.
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Originally posted by RadioRoy View PostIf you go for two carbs, be sure to design the linkage and set them up properly. I have never seen a home made dual linkage setup that worked properly. Don't forget the choke system.Last edited by Guest; 08-12-2014, 04:28 AM.
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Originally posted by Skybolt View PostAll the intake and exhaust manifolds I used on the Flathead and OHV six were stock. All were sandblasted cleaned of casting slag and painted with heat proof ceramic paint.
All the adapter and spacers were bought on eBay and modified to suit. I did however make a spacer out of phenolic to enable the use of a PCV valve on the Champion six.
Len.
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Originally posted by LeoH View PostWhy the added PCV valve? As for the manifold, sure doesn't look like my 170, that's why I'm asking. The manifolds are both rounded stock on mine and shorter and not squared like yours.
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Originally posted by Skybolt View PostIn the first album there is a four barrel Holley, based on a Weber design, that I ran on my OHV six and the second album was a Holley 1940 single I had on a 170 Flathead.
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