Cold air intake

Mikes72sb · Post by **Mikes72sb** » Tue May 01, 2001 9:49 am

I know this isn't quite FORCED induction, but has anybody here ever experimented with a cold air intake for their flat 4 carbs or F.I.? I was thinking about the possabilities for a system for my dual 40 webers. At the very least, it will be a fun project for the summer. Any tips?

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\X/ Mike \X/

Chuck Schneider · Post by **Chuck Schneider** » Wed May 02, 2001 5:34 pm

If you really want to cool things down try an intercooler. I have heard of guys running an intercooler naturally aspirated with good results. Especially a water to air unit with ice water in the resvoir. Just picture 32 degree air going in your motor on a 90 degree day. That's 6% more H.P. or so.

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12.70 @ 104

Mikes72sb · Post by **Mikes72sb** » Wed May 02, 2001 5:37 pm

Allright then, how is an intercooler set up?

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\X/ Mike \X/

CptanPanic2 · Post by **CptanPanic2** » Wed May 02, 2001 5:43 pm

I was wondering how this topic relates to the stock preheater tubes, which warms the intake. Does this not hurt hp since it is after the carb?
Brian

Magoo · Post by **Magoo** » Wed May 02, 2001 9:23 pm

Steve,are,'t you the clever one! The old '66 single 4 bbl 4 speed macine weighed in @ 3720 w/ driver at the old Fremont scales.The best before run was a 14.97 and after the chilling exsperience ran consistant 14.40 when it would hook up .I.E. a 3500 -4000 launch in second gear was best for somewhat repeatable numbers,but a first gear start at anything over say 1500 and it was smoke city on the old wide ovals.....

Magoo · Post by **Magoo** » Thu May 03, 2001 12:26 am

Ciold air is a viable alternative,and can add several hp to the typical engine.You seem to have agreat start with a 72 bug that has the side vents behind the rear windows,just duct this air to the carb(s) and pick up 1% more hp for every 11 degree temp reduction as see at the intake a I ran cold air and super cold air back in the 60's and the cold air was good for about 2 tentyhs and 2 mph a setup with a dry ice load in an old ice chest routed to the carb was good for .47 et reduction on my old GTO...plenty of room under the hood there tho....BTW you WILL have to experiment with jetting....Magoo

Steve Arndt · Post by **Steve Arndt** » Thu May 03, 2001 12:56 am

You can't make a goat any heavier so you might as well carry a cooler and some beer

haha Good trick. jj.
Steve Arndt

74supa · Post by **74supa** » Thu May 03, 2001 8:27 pm

I just found out about these today i am thinking it sounds like a cool idea(no pun intended) from what i understand u make a box round the carb and hook up a hose to it and then to out side of the car somewhere well my question is while u are sitting in trafic will this make ur carb not get enough air since the air wont be getting pushed into the hose. please tell me if i am completly wrong on this one. as i said i am new to the idea

Mikes72sb · Post by **Mikes72sb** » Fri May 04, 2001 8:24 am

Well, my idea of the intake is not a ram-air setup, although it could be modified to be so. i don't believe that there would be a restriction of airflow, if there is a big enough hose feeding the air to the carb(s).

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\X/ Mike \X/

bigbadbug · Post by **bigbadbug** » Wed May 23, 2001 3:28 pm

Do not run this in the winter. You bug will run like crap and you will get carb icing. I have it one my 72 and it is not a good isea in the winter.

Bobtail · Post by **Bobtail** » Wed May 23, 2001 3:36 pm

What you need to bear in mind is if you ram air into the engine it will need extra fuel,This will also be speed related.
You are in effect collecting high pressure air and dumping into a low pressure area so the boxes don't need to be and should'nt be sealed you just need the high pressure to flow over the top of your carbs not rammed down them.IMHO