Air being (pulled in my case) through the radiator can be pretty hot, because there is 195 degree coolant running through the radiator. I'm sure this temperature of air is preferable to hot air rising from the exhaust manifolds and getting sucked down into the carbs, but I believe gasoline is a mixture of hydrocarbon fractions that boil between 100 and 400 F, so at least some of the fractions will reach boiling point with 100+ degree air blowing on the carbs. With fuel injection or even stock pressure of 8-11psi (higher pressures than Weber's can take), this will raise the BP considerably and likely those air temps are fine. But 3psi won't make much difference, gotta keep those weber's cool. Still, that air from the radiator is better than nothing...

b

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A couple ideas for you:

Weber snorkel adapter to run a remote mount air filter and cold air intake


Cheaper adapter to mount a stock four barrel air cleaner on a Weber carb

Mount two of either of those and create a true cold air intake system with a better closed element air cleaner. No more sucking hot air from the top of the engine compartment.

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Casually looking for a Clifford hyperpak intake for cheap.

I second that! A true, sealed cold air intake feeding from the side of the radiator core support should really help the situation more than many of the other suggestions.

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Rob

I’m Mater
The Kentucky Poser

That's where I started and I'm going to implement a cold air intake system. I believe you are correct.

I'll report back on that.

Brian

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I have same intake with Holley 1920s . Have same vapor lock problem when in high temp days and not moving . I have added cold air intake and only helped some . Pretty sure needs high air flow across carburetors . I am in process of installing wider radiator and high flow electric fan offset to upper driver's side . Possibly use intake hose from electric fan to carbs . I am very happy with this intake and carb setup besides this little problem . I do not drive in heavy traffic often . If u get a chance come to the slant races in Sacramento this summer . Killer Bee Racing schedule should be up before end of February . Hope this helps . Mark

Mark,

Can you quantify "only helped some"? My heat shields gave me extra minutes of time, perhaps 10, in traffic; so I'm hoping the cold air intake (CAI) will give me more traffic time.

How did you run your CAI? Just curious. Where are you sucking the cold air from?

BTW, I finished my CAI today, below are some pics. I had to move my orange box to the firewall, my coil to the back of the inner fender, my fuel pressure regulator to the front support, my horn and horn relay to the frame just below the alternator, but it all fit well. I'm now drawing air from the front end, see my hole below. Also, I'm using inline air filters; I ended up putting them in the 4" hoses just outside the plenums. I'm going to do a trial in the garage tomorrow, with the hood closed, see how long I can go before heat soak. I still have to fabricate my deflector for the fan, see if I can get more flow over the carbs.

http://s785.photobucket.com/user/67dart ... sort=3&o=0

http://s785.photobucket.com/user/67dart ... sort=3&o=1

http://s785.photobucket.com/user/67dart ... sort=3&o=2

http://s785.photobucket.com/user/67dart ... sort=3&o=3

http://s785.photobucket.com/user/67dart ... sort=3&o=4

http://s785.photobucket.com/user/67dart ... sort=3&o=7

Brian

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Nice work! I like it!

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Casually looking for a Clifford hyperpak intake for cheap.

Last night I fabricated an air dam as well.

http://s785.photobucket.com/user/67dart ... 6.jpg.html

http://s785.photobucket.com/user/67dart ... 4.jpg.html

Maybe more air when driving will help...

brian

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Could you post info about the air dam? I am using 68 Dart front sheetmetal on my brother's 74 Duster and I would like to fabricate a front air dam to keep air out from underneath the body. What did you use for the air dam and how did you mount it?

Thanks!

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Casually looking for a Clifford hyperpak intake for cheap.

I used 1/8" aluminum, 3" wide. Mounted to front lip, horizontal bit in the front of the radiator support. I cut a section out for the radiator center support and rounded the corners so it's not sharp. I used 6061-T6 Al as it is easily machined, drilled, filed.

I used little L brackets from the hardware store to mount it. Drilled into that lip to bolt in in place. I bent the brackets from 90 degrees to about 135 degrees prior to mounting.

Took about 1 hour total time to fabricate and install.

Let me know if you need pics.

Brian

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Cool, thanks! For some reason I had never considered using aluminum.

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Casually looking for a Clifford hyperpak intake for cheap.

I have CAI coming from behind grill . l only have heat soak in summer when outside temps are above 97 . Which is often . I think u may have it solved if enough airflow across intake . After running this intake for 5 yrs. It seems that this intake blocks and absorbs header heat more than 4 barrels . Have u tried high flow flex fan or clutch fan . I have early A body not extra space for fan . I expect if its having problems in this cool weather it's a must to have a lot of air flow . With all that effort it will work out soon . Mark

Yes, I have a high flow flex fan. I think the issue is the Webers and this low boiling petrol of today. Combination of low fuel pressure and low boiling gas. Fuel injection is the real answer, so I can raise the fuel pressure and this wouldn't be an issue.

I haven't spent any time on the fuel injection boards, I think I might go there for some schooling. Maybe throttle body injection would be an easy start for me, if I can figure out which would work well. I'd need two of them, like for 1.8L engine or 2.0L engine.

b

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I took it out for a test drive today. The CAI system certainly quiets my carbs. I used to get that "4 barrel" sound when I kicked it down, but those heavy aluminum plenums dampen the sound considerably. It is quieter, but I like it. Runs fine, plenty of air flow to the engine with that 4" tubing, probably more than enough.

brian

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If you go to fuel injection, I strongly advise you to skip the band aid of TBI and skip straight to MPFI. I still lean heavily to the Ford MAF based system, but that will take some adapting, but definitely doable.

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Casually looking for a Clifford hyperpak intake for cheap.