[ta man]

Originally Posted by scott70

Going back to the original post ,500-530 hp can be easily done with a stock iron intake with just a little bit of work. I also ran a T2 and was very pleased with it for a single plane and it fit under the hood nicely.

To me it depends on the carb..with a Quadrajet use the stock intake..with a Holley use the Torker 2.

[Steve C.]

My situation...

I use a fiberglass hood that has a factory shaker scoop molded to it and a K&N air filter assembly that goes up inside the scoop when closed. The scoop is open at the rear.

For tuning with the installation of my current direct port fuel injection setup we put the car on a chassis dyno. At the end of the session for interest we tested and found my air cleaner assembly cost 17 HP at peak power rpm.
608 HP to the wheels with and 591 HP without. However because of the hood scoop arrangement with a Victor intake and throttle body I cannot run a large air cleaner, it's a K&N 9-inch diameter filter with a X-Stream filter top.

In my situation vent clearance is not an issue, and personally for me the loss of hoespower is no big deal.

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[chiphead]

Originally Posted by Steve C.

My situation...

I cannot run a large air cleaner, it's a K&N 9-inch diameter filter with a X-Stream filter top.

In my situation vent clearance is not an issue, and personally for me the loss of hoespower is no big deal.

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Did going with and without the filter change the AFR, or just the pumping losses?

What is the height of that 9" filter?

[ta man]

Originally Posted by Steve C.

My situation...

I use a fiberglass hood that has a factory shaker scoop molded to it and a K&N air filter assembly that goes up inside the scoop when closed. The scoop is open at the rear.

For tuning with the installation of my current direct port fuel injection setup we put the car on a chassis dyno. At the end of the session for interest we tested and found my air cleaner assembly cost 17 HP at peak power rpm.
608 HP to the wheels with and 591 HP without. However because of the hood scoop arrangement with a Victor intake and throttle body I cannot run a large air cleaner, it's a K&N 9-inch diameter filter with a X-Stream filter top.

In my situation vent clearance is not an issue, and personally for me the loss of hoespower is no big deal.

.

There is an interesting Engine Masters episode testing filters..the X-Stream tops did very well..when just drawing from the top. I'm currently going back to a stock look with my car, shaker hood and scoop and I am back in the will it fit? and will it loose power? dilemma. I have 2 scoops, stock and a higher VFN scoop.

[Steve C.]

I wasn't involved in the chassis dyno session, John in my signature, took the car.
They only did one pull without the filter assembly for interest. No changes were made if they were indicated.

With the current throttle body the K&N filter is 2.875" tall.
Prior to the direct port fuel injection I was using my custom Holley HP950 carburetor.Still with a short filter and the X-Stream lid.

Related, despite the criticism involving the X-Stream filter lid I've been comfortable using one. When I spoke with a K&N tech rep asked about it he supported comments made by some that the entrance on a Holley 'HP' series carb with its smooth contour does in fact act like their Stub Stack and will help it work with the X-Stream lid. Whereas apparently a carb design without a smooth contour (w/ choke tower) and like a Q-jet doesn't work well with a X-Stream lid.

I also spoke to the K&N rep about the air flow requirements for my 505 and if the small air cleaner at the time was adequate. According to their formula a 505 cubic inch engine at 6000 rpm requires about 745 cfm of air flow.
According to him both my filter and the X-Stream lid together would support about 650 cfm. In his opinion, for street use I was fine.

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[Steve C.]

TA man
Your comments reminded about the very sucessful Pontiac Super Stock racer John Clegg who stated that a front-facing hood scoop will work as a ram air source only if the car in question is doing 200 mph.
That said, at one time he used a small Harwood scoop mounted backwards on the hood of his 8-second former record holding Firebird. It looked like a large size Trans Am scoop.

https://www.eharwood.com/catalog/scoops/aero-scoops/


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