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 Post subject: BBD butterfly holes?
PostPosted: Fri Apr 26, 2019 2:57 pm 
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Turbo Slant 6
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Joined: Wed Apr 30, 2003 6:43 pm
Posts: 911
Location: SoCal
Car Model*: Toad Wagon
Howdy, Gentlemen,

I've switched to a larger throat BBD (non high hat style) on El Toad, and though quite happy with the mid range and top end results, I'm less than enchanted with the idle and draw down characteristics.

I can't get the idle decently low even with the butterflies fully closed, and the draw down rate sucks. It appears that the pair of holes in each butterfly are enough to defeat my efforts there. So I'm considering soldering'em up and forcing the mixture to go around the butterflies, old style, thus regaining the idle set screw's adjustability. Or perhaps just one hole in each.

Haven't done this mod before, so would like to hear pros & cons from anyone who has.

_________________
Sex, drags, and rock & roll.
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 Post subject: Re: BBD butterfly holes?
PostPosted: Sat Apr 27, 2019 8:23 am 
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1 BBL (New)

Joined: Thu Sep 13, 2018 11:56 am
Posts: 8
Car Model*: 1962 and 1966 valiant
I had this old slant on a test stand for 3 or 4 month missing with the lash, timing and carb.
It would not idle below 1200 rpm and plugs indicated it is running lean.
It has the same Carb as yours, I roughed up the plate on both sides around the holes and Applied JB weld. It now idles at 600 and revs to 3000 without missing.
The down side is I have only run it thru 3 or 4 180 degree heat cycles so I don’t know how the JB will hold up.


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 Post subject: Re: BBD butterfly holes?
PostPosted: Sat Apr 27, 2019 12:19 pm 
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TBI Slant 6
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Joined: Sun Aug 14, 2016 5:52 pm
Posts: 133
Location: SW Washington
Car Model*: 66 Valiant, 82 D150, 94 Ram 2500 TCD, 69 Dart
I wouldn't worry too much about the JB Weld failing. I used it to repair a cracked block (leaking from the water jacket) on my ancient Ford when I was dead broke. All I did was rough up the surface and smear it on. When it dried I added coolant and drove the thing for another couple of years with no leaks.


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 Post subject: Re: BBD butterfly holes?
PostPosted: Sat Apr 27, 2019 5:36 pm 
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Turbo Slant 6
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Joined: Wed Apr 30, 2003 6:43 pm
Posts: 911
Location: SoCal
Car Model*: Toad Wagon
Yeah, I JB'd our float's drive engine (390 FE) radiator temporarily a couple years ago, and with decent prep it was still fine when I at last got a round twit this spring. Done right, JB can be impressive. I'm tolerable at mechanical soldering though, thanks to some time in the aircraft industry back when, so it'll be solder for me.

Thanks, 62 val, that's about what I figured. Just wanted to find out if I was missing comprehension, and about to try something stupid (once again :lol: ).

_________________
Sex, drags, and rock & roll.
Dick, 225% crazy.
Hobby (cars, that is) Photos link


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