Quote:
Originally Posted by Steve C.
Smittyseng- Yes. Over the years when my car has gone to the track it never had a air cleaner installed. But it has never been a dedicated race car and I don't think the few times it was raced without a air cleaner hurt anything. That and I have a hood clearance issue. As the car is set up currently in order to get the Victor intake under my hood with the small 9-inch air cleaner installed the intake carb flange was milled down 0.650". The shaker scoop is mounted to my fiberglass hood and the air cleaner is actually up inside the scoop. It's now a street car only, for the most part we only took it to the track to confirm it's a 10-second ride. And when we did we never bothered to put on a carb spacer. But if I were to race it I could pull the air cleaner assy off and add on a carb spacer to retain back some of the power loss from cutting down the intake. On the dyno it lost about 8-10 hp with the intake flange cut down. I can run a Performer RPM intake with the air cleaner installed but I'd give up over 40 hp !
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I was curious if you saw a speed difference between having it on and taking it off at the track. My engine is smaller than yours (462) and went from making 575 hp or so to about 535-537 with the 3x9 at wot the day we tested all the different air cleaners. These were back to back test. The power loss started at about 4500 up and the afr's at wot dropped about 2 full points. The motor sounded choked off and also at wot the restriction was enough that the map sensor reading went from 99 kpa (which is about .8" of vaccuum) to80 kpa which is about 6" of vaccuum. I had previously ran this air cleaner on a strong 69 gto that ran into the high 11.60's so I was surprised but did expect to see some kind of drop.
I also built this motor to go in my 1974 TA Clone and one of the options I was thinking about was mounting the scoop to the hood and running a 3x9 (I have previously done this). I am running a Victor intake BUT I am using a Scorpion throttle body that is just over 1.5" thick so other than IAC clearence issues I plan on using a drop base from Pro-touringfbody with a 14x3 or 14X4 air cleaner. I bought a Larry navvarro deal from Butler and sent it back) but the flat air cleaner they give you with it would be more restrictive than the k/n we are talking about, Smitty