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Offenhauser 2 1bbl setup

 
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'67 Dart 270
EFI Slant 6


Joined: 23 Nov 2011
Posts: 412
Location: SF Bay Area

Post subject: Offenhauser 2 1bbl setup (Tue May 08, 2012 2:18 pm) Reply with quote

I've decided to go with a dual 1BBL offy intake for my 225 (with Dutra Duals).

Does anyone recommend the Holley 1920 or Carter BBS, one over the other?

Does SlantSixDan or anyone, have matched set of either for sale?

Thanks All,

'67 Dart 270


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SlantSixDan
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Joined: 31 Oct 2002
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Post subject: (Tue May 08, 2012 2:36 pm) Reply with quote

There's a case to be made for the 1920, the BBS, the 1945, the WA3, and other carbs on the Offy twin 1bbl setup. The most important thing is that the two carbs be exactly matched. Send me a PM and I'll see what I can dig up. Setup notes for the twin 1bbl are here.



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kesteb
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Joined: 06 Nov 2002
Posts: 1625
Location: Everett, WA

Post subject: (Wed May 09, 2012 5:41 pm) Reply with quote

A pair of these http://stoveboltengineco.com/catalog/store/#ecwid:category=361512&mode=product&product=1222026 would be interesting.

They sell them for the 235 chevy.


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'67 Dart 270
EFI Slant 6


Joined: 23 Nov 2011
Posts: 412
Location: SF Bay Area

Post subject: dual carbs (Wed May 09, 2012 10:20 pm) Reply with quote

How did you find these? Is it $180 for the pair?

Are they enough CFM's if they were intended for a 97 cu. in. engine?

I'm intrigued for sure...I suppose they'd fit an offy manifold, even if I needed adapter plates...

brian


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'67 Dart 270
EFI Slant 6


Joined: 23 Nov 2011
Posts: 412
Location: SF Bay Area

Post subject: dual carbs (Wed May 09, 2012 10:28 pm) Reply with quote

For that price, it's almost a no brainer to try them...

Might even be better than dual 1920's or BBS's....


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kesteb
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Post subject: (Sat May 12, 2012 10:07 am) Reply with quote

The carb pads on the Offy are more then big enough to drill for these carbs. No adapter needed.


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'67 Dart 270
EFI Slant 6


Joined: 23 Nov 2011
Posts: 412
Location: SF Bay Area

Post subject: carbs (Sat May 12, 2012 12:32 pm) Reply with quote

..and these are progressive carbs, designed for a 98cc engine, so two of these would be perfect for a slant six. At low R's no issues with too rich a mixture and at higher R's, likely all one would need. Like a small four barrel but better flow with the dual offy...can't wait to set it up!

BG


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'67 Dart 270
EFI Slant 6


Joined: 23 Nov 2011
Posts: 412
Location: SF Bay Area

Post subject: kick down linkage (Sat May 12, 2012 8:21 pm) Reply with quote

Anyone know how to hook the kickdown linkage when using the offy manifold with two carbs?

bg


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Dart270
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Joined: 21 Oct 2002
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Location: Blacksburg, VA

Post subject: (Sun May 13, 2012 4:03 am) Reply with quote

You either rig up a kickdown cable, or run w/o one and lock the KD lever back about 1/2-2/3 of the way.

Lou



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SlantSixDan
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Post subject: (Sun May 13, 2012 8:27 am) Reply with quote

Dart270 wrote:
You either rig up a kickdown cable, or run w/o one and lock the KD lever back about 1/2-2/3 of the way.


The latter suggestion is a good recipe for slow-cooked transmission, yum. Do the job completely and correctly. Working throttle pressure ("kickdown") linkage of some kind is necessary, whether it's a stock-like rod setup or a cable setup. See this thread for some aftermarket kickdown options.



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wvenable
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Joined: 29 Nov 2007
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Post subject: (Sun May 13, 2012 8:29 am) Reply with quote

What is the cfm rating for these carbs (stovebolt webers) ?



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'67 Dart 270
EFI Slant 6


Joined: 23 Nov 2011
Posts: 412
Location: SF Bay Area

Post subject: kickdown linkage (Mon May 14, 2012 2:23 pm) Reply with quote

Thanks so much, definitely want a complete and well done setup, I was just asking how others might have done the kick down. Thanks for link!

BG


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Doc
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Joined: 14 Oct 2002
Posts: 5148
Location: Working in Silicon Valley, USA

Post subject: (Mon May 14, 2012 2:51 pm) Reply with quote

You run a rod thru the two posts, already casted into that intake, then make some pieces to connnect it to the trans KD lever.
DD


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