That would make a difference. Maybe it's not an issue then.
I had forgotten that Studebaker had done some supercharged applications. That makes sense now.

The factory probably set it up for 8 psi boost, which wouldn't require throttle shaft mods, though. I bet the factory never expected the 20 psi (IIRC) he is putting out. As far as I know, he is the only one using Carters, but boost leak at the throttle shafts doesn't seem to be a concern for him.

How would the marine throttle shafts stop leaks?

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car

The marine AFBs have grooved and slabbed throttle shafts so that fuel puddling on the throttle plates doesn't leak out the ends of the shafts creating an explosion hazard in a boat. I don't know if this would really help us or not. I guess I should have said it would be worth a try rather than claiming it would work.

Ted Harbit is not the only one using Carters. A few years ago I was corresponding with a guy running a 600 AFB or Edelbrock on a turbo small block in an early Corvette. He was making over 700hp and was using a Holley Black pump to feed a boost referenced mechnical pump and a bypass regulator along with the big needle and seat I mentioned. All he ever did to the carb was the marine accelerator pump seal and jetting. He also pressure tested AFB floats and found they will dent around 14 PSI or so, but still work fine. He tried, but never did have any luck filling the floats. My fuel delivery plan is a Walbro 255 LPH EFI pump and a Mallory bypass regulator to an Edelbrock 500. Air will flow through a Turbonetics hat. The K&N hat is restrictive.

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Joshua

This is what carter did on the blown studebakers.
You can see the air channels around the throttle shafts, which were connected to pressure above the carb.

You can also cut grooves into the manifold, or an adapter, and see if the carb you use has some kind of passages to the shafts, or drill some yourself.

Exactly!!! That's what a Holley requires for higher boost levels.

I bet an R2 Carter is harder to find than a 400 cfm Carter.

I forgot that the Carter's don't have solid floats either.

I wonder if a Thermoquad could be made to work.
Either way, the safest thing to do is find some way to keep fuel and boost from leaking around the throttle shafts, IMO. Or limit boost to 8 psi.

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car

I Bet you can find one of the R2 Carbs Quite easily - Just go to your local cruise in(s) and Find one of the Die hard stude guys -- Ask him if he has A copy of "Turning Wheels" - The Stude Drivers' Club mag.

There is a bunch of stuff for sale and repoped for the old stude.


Greg

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http://www.youtube.com/hyperpack

Thank you everyone. I bought a Demon 650 blow through. I may regret this since now that I have it, I noticed the annular boosters were pressed in off center on 2 of the bores and the wrong size squirters. I called Demon and the guy there told me that its OK that the boosters are not seated, as long as they are not loose. Also they must have run out of #28 squirters and that the #31 are fine. I asked then why design it an intended way and build it another? I also got a line kit that had bad threads and wouldn't screw into the bowl. Bummer for me. I will send it back and try to get it fixed.
On another note, my dad was a big Studebaker fan and I inherited his Turning Wheels collectio.(several hundred) which I will peruse this weekend. I may abandon the Demon and just go with a CSU 750 that they will setup. Dunno, but the Demon Carburetor I bought is poorly made!
I did finish my belt drive pulley. It looks and works great. Brackets are next and then plumbing.
AZ

What did they do to make it ready for blowthru? Any kind of a list?

Is the baseplate modified like the R2 carb above?

Did they do anything with the power valve?

I'd heard that Demon was going to make a BT carb, but it was just rumored last I heard. I wonder if they put any real development in it, or just re-labelled the box.

Don't know much about Demon carbs, other than the people that swear by them.

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car

1) The Demon BT allegedly has sealed throttle shafts, solid floats, and is "calibrated" for boost conditions. It sounded like the right choice but after getting it I am wondering if it was assembled as they say it is in their ads. The boosters were pressed in crooked. Also, assembly of this carb was not done well (wrong parts, fit and finish).
2) It has 1- 6.5* PV installed. No known alterations. I also noticed that all of the vacuum lines were plugged with removable plastic screw-in plugs and 2- 1/8" steel screw-in lines were shipped loose.
3) May be a relabeled box. I actually was wondering that myself... But needless tro say, to get this to work on a Slant will require some adjusting.
4) I will try to get to Redding this August. I will need to complete the car to a point and have access to a car trailer. I might blow her up and need to tow her home I have a Dodge diesel to pull it though.
Thanks everyone

Here is a link to my car. More pics soon...

http://71.127.251.36:1025/photogallery/ ... 64Dart.JPG

http://www.turbomustangs.com/smf/index. ... ic=31514.0

http://www.turbomustangs.com/smf/index. ... ic=62973.0

Here are a couple of threads discussing the Demon BT carbs.

Don't know if it helps or hurts, didn't read it all (the top one was really long).

Just remember to take everything with a grain of salt.

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car