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Author Topic: variable venturi carb  (Read 1335 times)

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Offline jonz2pinto

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variable venturi carb
« on: May 15, 2014, 01:32:33 PM »
Has anyone used a variable venturi carb ford used.brother had an ex-police cruiser-ltd with one on the 351w.it sounded like secondaries on a four bbl carb opening up.sounded pretty good.
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Online dga57

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Re: variable venturi carb
« Reply #1 on: May 15, 2014, 11:56:35 PM »
I had one new on a 1980 Lincoln Continental Town Car with a 351 and it was a total piece of crap - that car never ran right and nothing the dealership mechanics did to it helped!  I traded it in the next year for a 1981 with the 302 EFI which performed much better. 
 
Dwayne :)
 
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Offline amc49

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Re: variable venturi carb
« Reply #2 on: May 16, 2014, 03:27:27 AM »
And what most people did. We changed them out for regular 2 bbl. at our shop. The carb is super b-tchy about being kept adjusted correctly all the time and some very complicated adjustment to do requiring dial indicator. The main diaphragm commonly goes bad on them to make absolute h-ll. The top plate leaks air all the time and must be 100% sealed or kiss it off. A very troublesome carb. It doesn't even flow that much wide open.

One should know a couple of very important facts regarding CV type carbs, of which it is one. They NEVER make as much power as a direct opening carb will as the velocity is always high. You get maximum power with denser air, CVs do not allow that. One other thing, they absolutely will not open all the way with a slightly rich setting like you need on hi-perf engines, they open farthest when slightly lean and how you burn up engines.
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Offline jonz2pinto

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Re: variable venturi carb
« Reply #3 on: May 16, 2014, 01:11:06 PM »
Thanks for the info.I guess in theory it sounds good.never hurts to ask.
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