Ah yes, free horsepower from ram air. This is a favorite subject of mine. Lots
of experiments and study of the effect.
The prime thing I found was that cooler air, near the roadway, was a better
giver of free bhp than anything else. It takes a lot of speed to actually
get an ram effect. Now if you use a corrugated flexible tube you just tossed
all chance of ram out the window for as the speed increases the wall drag of
the tube and reduces the effective diameter to half of or less, how
disappointing. Smooth tube works though.
If the ram tube is led directly to the carburetor inlets you can have the
problem that the car will not run very well at anything but light throttle.
Why? The slight ram and I mean slight will give the carburetor more pressure
than the float bowl fuel sees, thus the float bowl will not flow the fuel.
Fix this by making a box for Webers that includes the float chamber inlet and
on S.U.'s just connect the float lid overflow pipe to the air tube with a
piece of hose. Still problems with miss fire etc, poor high speed running?
Probably it is the turbulence in the box and the carburetors are not getting
equal air, and in fact may have choked off some of the inlets opening. Fix?
Cut a hole in the back of the box the size of ONE carb butterfly (if that is
better but still a little problem, increase the hole size 50%) and make
certain the box extends well past the inlet of the rear carburetor inlet.
When you are all finished, you'll have spent some money, some time, some
labor and testing and for this probably will not gain a single horsepower
because these boxes (car shape) do not operate at the speeds needed for true
ram effect.
Cool air? Yes, now you're talkin'.
Never Be beaten by Equipment
Kas Kastner
----- Original Message -----
From: Bill Babcock
To: Chris Kantarjiev ; fot@autox.team.net
Sent: Thursday, September 07, 2006 8:44 AM
Subject: RE: [FOT] Air filter ("socks"?) for carb air horns?
It can be very tricky. Peyote has an advantage in the Knobbly Lister
type pop-up in the middle of the hood--there's likely a high pressure
area in front of it, but finding high pressure areas (not always where
you'd think they were), sizing the ducting, and getting everything to
fit can be very tough. I attempted to improve the ram air for my Radical
and made a real bodge of it. Five days of work, two test days, and the
stock setup worked better.
> -----Original Message-----
> From: owner-fot@autox.team.net
> [mailto:owner-fot@autox.team.net] On Behalf Of Chris Kantarjiev
> Sent: Thursday, September 07, 2006 7:32 AM
> To: fot@autox.team.net
> Subject: Re: [FOT] Air filter ("socks"?) for carb air horns?
>
> I, too, am a fan of ITG filters. TWM used to be a dealer, I'm
> not sure how much attention they pay these days.
>
> mjb turned me on to them. He used to stock and resell the
> whole line, but I don't know if you can get his attention long enough.
> They make blank backplates (including for double and triple),
> and that's what I used, along with a borrowed Rotax punch, to
> make a suitable plate for my stepped triple DCOE GT6 manifold.
>
> That installation has a number of problems for mounting a
> filter, but it can be done, just, over shorty air horns. This
> winter, I plan to make a cold air box to fit the backplate
> and remote the filter to behind the headlight. I'm tempted to
> try to set up a ram system, but my memory of discussion here
> is that is trickier to get right than I have development time for...
>
> chris
>
>
> === Help keep Team.Net on the air
> === http://www.team.net/donate.html
=== Help keep Team.Net on the air
=== http://www.team.net/donate.html
|