BMC air filter

[glaverbel911]

In years past I’ve always recommend the BMC air filter element as a replacement for peak performance.
It would yield a power loss not worth mentioning from T too 2.7 RS engines.

My latest BMC instalment has been very disappointing in a 2.0E motor with S spec valves yielding 173Hp@7150 without filters. With BMC installed I’m loosing a solid 7Hp .

Upon closer investigation and comparisons the new BMC is now 1.5” shorter in length and the outside circumference is small by 1.5” thus not giving enough airflow passage and restricting.

Has anyone purchased the latest K&N lately ? They seem to be getting harder to find as well other than from stoddards. If so could you please provide me the filters dimensions and K&N part number?

Best, Robert

[JimmyT]

K&N '65-'71 Stock 911 Replacement Air Filter = E-2380, UPC: 024844002730, Suggested List: $110.24

Dimensions: OD: 5.313", ID: 3.500" Hgt: 8.750"

K&N Online Store: No longer listed
Summit, AutoZone: Out Of Stock
OffRoad Warehouse: $64.99
NAPA: $74.99
Stoddard: $85.00

[glaverbel911]

K&N '65-'71 Stock 911 Replacement Air Filter = E-2380, UPC: 024844002730, Suggested List: $110.24

Dimensions: OD: 5.313", ID: 3.500" Hgt: 8.750"

K&N Online Store: No longer listed
Summit, AutoZone: Out Of Stock
OffRoad Warehouse: $64.99
NAPA: $74.99
Stoddard: $85.00

Thank you Jimmy.
It Almost seems like the BMC and K&N are made by the same factory. Dimensions are the same and Only the end seals have a different colour.
I don’t understand why they are making the filter so small. It’s defeating the purpose and at those prices you might as well just stick with stock power sucking Mann filter.

Regards
Thanks again for the K&N info.

[Noah]

How much power is lost via the Mann filter?

[glaverbel911]

How much power is lost via the Mann filter?

I’ll have a 2.7l RS spec motor on the test bench tomorrow.
I’ll do a comparison test for you with a Mann. I have a K&N on order but it’ll be a week.

A few years ago I recorded a 8hp drop with a Mann filter.

I made an error in regards too the Dimensions between BMC and K&N .
The K&N is the proper length. The new short BMC looses 1.5” of filtering length .

[glaverbel911]

I located and ran a K&N filter for comparison today.
I ran the test with a metal airbox because of the metal stacks. But without any snorkel. A full length snorkel drops power an extra .7hp.
Tests using a 2.7L RS spec MFI motor.
Todays HP correction factor is an extra 1.037 too the figures on the screen.
Test 1 - Mann 214.4 Hp corrected
Test 2 - K&N. 219.6Hp corrected
Test 3 - no filter or airbox. 221.8Hp corrected

Test 3 probably would have gained an extra 1.5hp if I had dropped the AfR to a richer 13.1. It ran leaner because more air was entering for lack of restriction.

[uai]

If you're just looking for a filter of any make and want to search for dimensions
There's a link here - I'm driving some filter of an excavator
https://catalog.mann-filter.com/EU/ger/dimensions

[JimmyT]

Thanks for taking the time to do and share the results of your comparison. That is data that you can believe in.

I located and ran a K&N filter for comparison today.
I ran the test with a metal airbox because of the metal stacks. But without any snorkel. A full length snorkel drops power an extra .7hp.
Tests using a 2.7L RS spec MFI motor.
Todays HP correction factor is an extra 1.037 too the figures on the screen.
Test 1 - Mann 214.4 Hp corrected
Test 2 - K&N. 219.6Hp corrected
Test 3 - no filter or airbox. 221.8Hp corrected

Test 3 probably would have gained an extra 1.5hp if I had dropped the AfR to a richer 13.1. It ran leaner because more air was entering for lack of restriction.

[Noah]

Thanks for doing that Rob, very interesting. I wouldn't have guessed that since I always thought the stock snorkel/filter setup made the most power. Maybe I need to get a K&N.

[STEVES]

Try this

http://pipercrossusa.com/px1352.aspx