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my quady on 307 chev is stuffed tossing up between getting a reco quady or a 600 holley. engine has mild cam & is a daily driver. opinions/advice please
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Ummm, so what makes you think it is stuffed?
Might be as easy as putting a kit through it.
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Quadrajet as first choice and Holley 650 spreadbore vacuum secondary as second. Holley as first choice if LPG being used.
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* Good all round performance , easy starting hot or cold... hint of fuel economy..Go the Quaddy. (but fit an electric pump to feed it if you are going to rev it).
* Top end performance... ease of jet / power valve changes.. forget economy... occasional
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I would think twice about fitting a Holley double pumper to a V8 running duel fuel. When running on petrol, then switching back to LPG, the secondary tank on the Holley stays full of petrol, so when the secondaries open up both fuels mix together, causing Edited by user Tuesday, 16 January 2007 7:13:22 PM(UTC)
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The 650 vac speadbore is a much better carby than the 600 squarebore as it has baby primaries. A divorced choke example is less than $300 from Hume. I agree with Rhys that a double pumer should not be considered, but I don't see anyone recommending one ei |
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Can't see where anyone mentioned gas or double pumpers.. What the ?
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My apologies guys, I thought all Holley 600s were double pumpers, all the ones I've seen in the past have been.
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Rhys I have seen carbys that have been running LPG and petrol at the same time and they have burnt out the boost venturi's I have seen it on Holleys and Q-Jets. So try to run all the fuel out of the carby before swaping over to gas.I use the Q-Jet on the Edited by user Wednesday, 17 January 2007 9:19:00 AM(UTC)
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byron what do you mean by "divorced choke" ? do you know the model no. for the 650 ? what manifold would you recomend ?
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Holleys are a bad choice for dual fuel IMO. They don't like being dried out and when you change from lpg back to petrol they're prone to playing upfor a while until they stop leaking fuel from dried out O rings and gaskets.
I remember fixing a 351 that h
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quote:
Originally posted by jay
byron what do you mean by "divorced choke" ? do you know the model no. for the 650 ? what mani |
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While we're debating this, how do you think a quadrajet would go on a 186? The primaries look small enough to do the job & as I understand it the secondaries would only draw fuel when there was enough vacuum to open the top butterflies (no, I don't know m
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It does work - I've seen it done before. Although a 390 Holley will probably work better.
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thanks for the advice guys. what`s the difference between single & dual plane manifolds ? what are the pros & cons of each ?
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ooh ooh! One I can finally answer (kinda)! In between the carby & the inlet runners dual plane manifolds have 2 chambers(one chamber each for half your total number of cylinders), single plane has one. Dual planes are better for the street (as the vacuum
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I run a 253 commodore Q-jet on my 40" 202 in my HR. From memory it has primary 68 jet 48 rod and DP secondary rods and I have adjusted the secondary air flap up so it is lots firmer than std.
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Cool, thanks for that. By the way - were there different quadrajets for 253's & 308's? How do you tell the difference?
The Beige Hornet.
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The commodore 253-308 carbys are the same on the outside just jetted and rodded differently.Somewere I have paperwork on iding Rochesters but I think it is for US models not Aussie stuff. I will try and find it and see Edited by user Monday, 22 January 2007 9:27:56 AM(UTC)
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thanks every one for your advice & help. byron you mention hume performance i take you use there stuff a bit, what is there quality like & value for money ?
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