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post #1 of 11 (permalink) Old 06-04-04, 10:22 PM Thread Starter
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air filter

im thinking of putting an aftermarket air filter on my ea gl falcon (1990). somthn like a mushroom shape so it will fit over th carb and under th bonnet. is this pipe important? cos it will b connected to nothing if i get a filter


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post #2 of 11 (permalink) Old 06-04-04, 10:30 PM Thread Starter
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Re: air filter

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post #3 of 11 (permalink) Old 06-04-04, 10:31 PM
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Re: air filter

I'd convert to MPFI mate, not much point modding a CFI engine. It won't cost much, maybe 200 bucks if you shop around.
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post #4 of 11 (permalink) Old 06-04-04, 10:32 PM Thread Starter
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Re: air filter

look at th pic now
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post #5 of 11 (permalink) Old 06-04-04, 10:33 PM
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Re: air filter

Oh and that piping, removing it won't help cold starts. It feeds hot air into the intake when the engine is cold.
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post #6 of 11 (permalink) Old 06-04-04, 10:33 PM
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Re: air filter

that pipe that has the red lines on it is a heat pipe which has to be there to pass a RWC. what it basically does is draws heat from the mainfold to the carb to assist when the enigine is cold.

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post #7 of 11 (permalink) Old 06-04-04, 10:37 PM
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Re: air filter

Quote:
Originally Posted by psycho chicken
Oh and that piping, removing it won't help cold starts. It feeds hot air into the intake when the engine is cold.
damn how quick do you have to be around here!

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post #8 of 11 (permalink) Old 06-04-04, 10:41 PM Thread Starter
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Re: air filter

yeh k, so i cud add an air filter. ive measured and a musroom wud fit over th carb, and point that pipe at th filter. that shud b sweet ay? also, is th pipe that draws air frm th outside (front) of th bonnet to the carb important, i cud take th big ugly tennis raquet off and still hav that pointing at th carb.
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post #9 of 11 (permalink) Old 06-04-04, 10:45 PM
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Re: air filter

Well technically no. That pipe leads to a valve in the tennis raquet. It closes above a certain temp. Running the hose straight to an air filter over the throttle body would defeat the purpose of putting a larger air filter in, it'd be sucking heaps of hot air.

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post #10 of 11 (permalink) Old 06-05-04, 12:35 AM
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Re: air filter

You do legally need it, it's a part of the emission control system. There is a valve in the intake that is open when the engine is cold to allow hot recirculated air to be drawn into the intake. The valve closes once the engine is warmed up so you just take in cold air. Something to do with making the engine not run as rich when it's cold. Multi-point engines don't have this though, for reasons I still can't quite figure out. Probably because fuel delivery is much more controlled with multi-point.
You won't see much of a performace gain with a mushroom filter thingy anyway, as it's gonna be sucking hot air once the engine warms up regardless.
Converting to multi-point is a far better option. I'll be doing mine soon.

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