Rare intake
September 27th, 2020, 05:58 PM
#5
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Join Date: Jun 2009
Location: Aledo, Texas
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I’ve seen the car and had the pleasure to meet the creator on several occasions, although it has been just a while. He ultimately went to a dual quad setup, but even practical folks like myself have to smile at the sheer “over-the-top” notion. Truthfully, I’d like to have the intake purely for a conversation piece if nothing else..
September 27th, 2020, 06:49 PM
#6
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Location: West Hartford, CT
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Sorry if I’m sending this thread awry - Re: Quad Quad (I do love that thing)
1) The mist that develops above the carbs, is that some sort of reversion or is it condensation or is it something else?
2) Why do the secondary air flaps stutter instead of smoothly opening?
That blower manifold is nice, if you had one of those it sure would save some work machining something else.
1) The mist that develops above the carbs, is that some sort of reversion or is it condensation or is it something else?
2) Why do the secondary air flaps stutter instead of smoothly opening?
That blower manifold is nice, if you had one of those it sure would save some work machining something else.
September 28th, 2020, 03:02 PM
#8
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Join Date: Jun 2010
Location: Rogues Island, USA
Posts: 3,613
He's venting fuel because of the open tops. Creates a low pressure area above the carb and suction happens. You can even hear it change when it happens. Put a box around them or air filters and that will stop as long as the lid is far enough away from the air valves or the bowl vent.
September 28th, 2020, 04:07 PM
#10
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Join Date: Feb 2019
Location: The Seasonally-Frozen Wastelands
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He's venting fuel because of the open tops. Creates a low pressure area above the carb and suction happens. You can even hear it change when it happens. Put a box around them or air filters and that will stop as long as the lid is far enough away from the air valves or the bowl vent.
Every time the intake valve shuts, it sends a "ram-tuned" positive-pressure wave back out of the carb, carrying a "double load" of fuel with it, and in the process, it's interfering with the smooth operation of the air valve.
CONTAIN the fuel fog, and that air/fuel mix goes back down the carb AGAIN, picking up even more fuel. The Q-Jet design is unsuitable for this application--I don't know how you'd fix the air-valve problem, or lean-out the mixture so that three trips through the venturis gets just the right amount of fuel.
Last edited by Schurkey; September 28th, 2020 at 04:12 PM.
September 29th, 2020, 08:46 AM
#11
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Join Date: Mar 2008
Posts: 3,860
According to the August 66 Car Craft, the long ram Mopar intake tuned for 3000 rpm and then later the engineers found they could tune for higher rpm with a shorter ram, and get a secondary effect at half that rpm. Same issue of CC that covered the 66 W30 conversion at Hurst Performance on Dave Landrith's car. If you look at the photo of the short block closely, you can see it has a D cast in the side of the"400" so Dave actually used a 425, probably a Toro engine so it would take .921" lifters and a 39 degree cam like the 400.
September 29th, 2020, 08:56 AM
#12
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,677
That's great! I remember articles about mushroom lifters to get a larger effective lifter diameter to better use the cam lobe profile. I'm assuming the block was sleeved to get the 4.000 bore?
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