Air cleaner in Stock Class

Todd Boyer · 03-24-2010, 08:22 PM

There's another thread here about air cleaners with some interesting info about K&Ns and other HP filter systems. Worth a read.

http://classracer.com/classforum/sho...ir+cleaners%21

Lew Silverman · 03-24-2010, 08:36 PM

Thanks for the info - I'll check it out!

mopar jeff · 03-25-2010, 11:50 AM

So is it legal to just hose clamp a filter on the end of the throttle body?

Jeff Lee · 03-25-2010, 03:37 PM

The K&N filter top, worthless or not for HP, is allowable per NHRA. This was an issue when they first came out. The rationale is you do not need any lid so a K&N lid is acceptable.
I always ran one in D/S with the factory ram-air system. Can't say that it helped but it certainly didn't hurt. And Arizona is somewhat dusty so I always ran a filter.
I just noticed Todd put a link to the old discussion....

The Hawk · 03-26-2010, 04:01 PM

I remember this topic in early `03,and the Zane`s mentioned they were asked to remove the K&N top,I never had been asked. Sure enough,in Phoenix that year I was asked to remove it in tech. Still sitting in my storage unit.

Swandog · 03-29-2010, 12:42 AM

What about the definition of an OEM system for fuel injected cars? Can you simply remove the intake plumbing and bolt the filter on throttle body like mopar jeff suggested? Also, what about using common aftermarket "cold-air" style systems who use smooth mandrel built plumbing to replace the disruptive factory rubber tubing prior to the throttle body? Anyone have experience with legality and/or hp benefit of such a setup?

LNorton · 03-29-2010, 06:43 AM

Quote:

Originally Posted by Swandog

What about the definition of an OEM system for fuel injected cars? Can you simply remove the intake plumbing and bolt the filter on throttle body like mopar jeff suggested? Also, what about using common aftermarket "cold-air" style systems who use smooth mandrel built plumbing to replace the disruptive factory rubber tubing prior to the throttle body? Anyone have experience with legality and/or hp benefit of such a setup?

I was told by IHRA that we are allowed to put a filter directly on the throttle body. I would ask them at your next race as I am not sure NHRA's ruling.

03-24-2010, 08:22 PM	#1
Todd Boyer Senior Member Join Date: Feb 2004 Location: Saint John NB Canada Posts: 561 Likes: 30 Liked 6 Times in 5 Posts	Re: Air cleaner in Stock Class There's another thread here about air cleaners with some interesting info about K&Ns and other HP filter systems. Worth a read. http://classracer.com/classforum/sho...ir+cleaners%21

03-24-2010, 08:36 PM	#2
Lew Silverman VIP Member Join Date: Mar 2010 Location: Newport News, VA Posts: 1,435 Likes: 371 Liked 129 Times in 59 Posts	Re: Air cleaner in Stock Class Thanks for the info - I'll check it out! __________________ Lew Silverman #2070 "The Wagon Master" N/SA

03-25-2010, 11:50 AM	#3
mopar jeff Member Join Date: Aug 2009 Location: Riverside, CA Posts: 219 Likes: 0 Liked 0 Times in 0 Posts	Re: Air cleaner in Stock Class So is it legal to just hose clamp a filter on the end of the throttle body? __________________ Jeff Interlicchia 7077 D/SA 1998 Pontiac Firebird LT1 J707 E/T 1966 Dodge Coronet 500

03-25-2010, 03:37 PM	#4
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Air cleaner in Stock Class The K&N filter top, worthless or not for HP, is allowable per NHRA. This was an issue when they first came out. The rationale is you do not need any lid so a K&N lid is acceptable. I always ran one in D/S with the factory ram-air system. Can't say that it helped but it certainly didn't hurt. And Arizona is somewhat dusty so I always ran a filter. I just noticed Todd put a link to the old discussion.... __________________ Jeff Lee 7494 D/S '70 AMX

03-26-2010, 04:01 PM	#5
The Hawk VIP Member Join Date: Mar 2003 Location: Littleton,Colorado Posts: 1,194 Likes: 0 Liked 249 Times in 109 Posts	Re: Air cleaner in Stock Class I remember this topic in early `03,and the Zane`s mentioned they were asked to remove the K&N top,I never had been asked. Sure enough,in Phoenix that year I was asked to remove it in tech. Still sitting in my storage unit. __________________ Lane Weber It`s Not What You Drive That Wins....It`s How You Drive It

03-29-2010, 12:42 AM	#6
Swandog Junior Member Join Date: Sep 2007 Location: Canadian Prairies Posts: 21 Likes: 1 Liked 1 Time in 1 Post	Re: Air cleaner in Stock Class What about the definition of an OEM system for fuel injected cars? Can you simply remove the intake plumbing and bolt the filter on throttle body like mopar jeff suggested? Also, what about using common aftermarket "cold-air" style systems who use smooth mandrel built plumbing to replace the disruptive factory rubber tubing prior to the throttle body? Anyone have experience with legality and/or hp benefit of such a setup? __________________ Dustin Swanson Canadian Prairies