K&N top filter problems FYI

[ERA Chas]

Originally Posted by Jac Mac

Waste of time trying to diagnose stuff like this on a dyno with the hood open & no 'real world' airflow into the carbs.

Agreed-that's why I said 'feels like 20' more. Very noticeable improvement in pull at the top end.

[ratdog]

I put chrome top back on my 14" filter and took off the K&N top filter and car run better, I could run up to 55 on highway and it surged and didn't run right, I put old top back on and it runs great, you all decide, I know what I plan on doing, it is not doing back on...

[CobraEd]

It is a well documented problem seen over and over again.


.

[Tom Kirkham]

Originally Posted by ratdog

I put chrome top back on my 14" filter and took off the K&N top filter and car run better, I could run up to 55 on highway and it surged and didn't run right, I put old top back on and it runs great, you all decide, I know what I plan on doing, it is not doing back on...

Sounds like your old air filter is acting like a choke. The new air cleaner was allowing more air, thus the lean condition. Tune your carb to the new air filter and you will make more power.

[bobcowan]

Originally Posted by JBCOBRA

You realize that unless you have your carb(s) sealed like ERAchas, the hoodscoop doesn't let air in at speed. Actually the opposite is true. The Big hole in the front of the car lets in so much air that some of that air is forced out the hood scoop.

Not always true. I can personally vouch for gaining more power by adjusting the scoop opening. I think it depends on the total set up; including the body in it's relationship to the engine bay. Not all Cobra replicas are equal.

Originally Posted by Jac Mac

Thats because most dynos are not mounted on the back of a raised flat bed doing 80 mph down the freeway

Waste of time trying to diagnose stuff like this on a dyno with the hood open & no 'real world' airflow into the carbs.

This is very true. You don't often run the engine to the max with the hood open and the nearly insignificant air flow of that giant fan.

Originally Posted by ERA Chas

Agreed-that's why I said 'feels like 20' more. Very noticeable improvement in pull at the top end.

I have personally seen - on the dyno - a mild 408W gain 12 hp simply by swapping the solid top for the K&N filter top on a 14"x3" round K&N filter. It happens, I'v seen it. Again, I think it depends on your set up.

[ERA Chas]

Originally Posted by bobcowan

I have personally seen - on the dyno - a mild 408W gain 12 hp simply by swapping the solid top for the K&N filter top on a 14"x3" round K&N filter. It happens, I'v seen it. Again, I think it depends on your set up.

I agree Bob but the real benefits I found come from the car's forward movement and the colder ambient intake temp-added HP you don't see on the dyno.

[JBCOBRA]

Originally Posted by ERA Chas

I agree Bob but the real benefits I found come from the car's forward movement and the colder ambient intake temp-added HP you don't see on the dyno.

I am sure it works great, because your carbs are sealed to the hood.

Unsealed carbs...ever notice that when driving in the rain the air filter does not get wet from the rain?
Try taping some yarn to the front edge of the scoop and you will see for yourself.