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The Krypt Keeper

Jun 3 2005, 01:44 PM

There was a discussion on another board about ram air ducts..

I have always been under the impression that ram air comes into effect around 120 to 130 mph when the air being forced into the airbox is greater than the air going into the combustion chamber. This in turn pressurises the airbox making it force air down the velocity stacks into the combustion chamber. Here you will see a gain in HP probably about 4 or 5 on our bikes.. except the early models that just had them for looks..

anyways.. here is a responce that was written

QUOTE

The 1000rr air flapper only closes from 5,000 to 7,000 rpm for noise control. Its to keep the intake from honking at resonant frequency as it can get much louder than the exaust. The wires going to the vacuum solenoid can be removed and the bike may become a beast of a wheelie machine.

I found the top speed of my cbr600f4 was only 154 mph every time. Then I removed the ram air and it would sail up to 166mph with more to go. Without that ram air, the bike felt like it was loud enough to suck the eardrums out of my skull.

I am beginning to believe ram air on any bike is mostly for noise control and looks. Removing them makes for a louder bike and seems to increase torque.

If a F4 can sail up 166mph I am breaking out the duct tape and going busa hunting :lol:

Northman

Jun 3 2005, 02:02 PM

I didn't think the F4 had ram air :?

FWIW, if somebody is seeing a performance increase with the removal of ram air, it's probably due to a mapping problem, not due to "too much" air entering the engine.

IMO, he's a twit.

Amherst XX

Jun 3 2005, 02:17 PM

demon

Jun 3 2005, 02:17 PM

Believe it or not Dave, our bikes' ram air actually comes into play with pressure at 90 mph. It's the best designed ram air ever put on a bike so far. Sport Rider even says so.
http://sportrider.com/tech/146_9910_ram/
http://sportrider.com/tech/146_9912_ram/

I think the dipshit on cycleforums don't know what he's talking about. Some non ram air bikes run better with the top of the air box removed for less restriction.

demon

Jun 3 2005, 02:28 PM

Oh Chris, the F4 did have functional ram air. It had the oval tubes where as the F4i has the L shape tubes.

The Krypt Keeper

Jun 3 2005, 02:30 PM

90 mph.. hmm will have to ride that fast more often for optimum performance :lol:

I just thought it was funny...

buttonator

Jun 4 2005, 09:03 PM

My '97 doesn't have ram-air. :cry:

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