Stelling & Hellings air cleaner effectiveness Part Deux

[cycleguy55]

Has anybody ever put these on a flow bench to evaluate how restrictive they really are - or aren't?

Edit: I just found this, posted to https://www.ffcars.com/forums/17-fac...r-cleaner.html by 'mrmustang'. Hmmm....

Back to the original question, and dating back over 18 years
427 center oiler, 10:2:1 compression, 650 holley DB (already dyno tuned) fairly mild street cam as a base for the test on a "chassis" (not engine) dyno. This was done as we were baselining a new chassis dyno at a friends shop and thought it would be interesting to be able to show his customers the difference of what something as simple as an air cleaner could make.

My notes are as follows:

no air cleaner: 322hp
then 14X2 "K&N" air cleaner: 314hp
then 14X4 "green" air cleaner with drop base:324hp
then Stelling and Heller air cleaner (stock filters as we did not have K&N or Green filters in stock at the time):302hp

All of the above were done one after the other. No tweaks or changes where done to the carb or engine timing. Strictly a demonstration for about 20 customers who were at the shop that Saturday. All HP above was measured at the rear wheels.

The car was ERA321, dark blue metallic, running a toploader 4spd and 3:31 rear gear ratio.


Second Strike Air Cleaner Calculator: https://www.secondstrike.com/Technic...leanerCalc.asp

[mrmustang]

Originally Posted by cycleguy55

Has anybody ever put these on a flow bench to evaluate how restrictive they really are - or aren't?

Edit: I just found this, posted to https://www.ffcars.com/forums/17-fac...r-cleaner.html by 'mrmustang'. Hmmm....

Back to the original question, and dating back over 18 years
427 center oiler, 10:2:1 compression, 650 holley DB (already dyno tuned) fairly mild street cam as a base for the test on a "chassis" (not engine) dyno. This was done as we were baselining a new chassis dyno at a friends shop and thought it would be interesting to be able to show his customers the difference of what something as simple as an air cleaner could make.

My notes are as follows:

no air cleaner: 322hp
then 14X2 "K&N" air cleaner: 314hp
then 14X4 "green" air cleaner with drop base:324hp
then Stelling and Heller air cleaner (stock filters as we did not have K&N or Green filters in stock at the time):302hp

All of the above were done one after the other. No tweaks or changes where done to the carb or engine timing. Strictly a demonstration for about 20 customers who were at the shop that Saturday. All HP above was measured at the rear wheels.

The car was ERA321, dark blue metallic, running a toploader 4spd and 3:31 rear gear ratio.


Second Strike Air Cleaner Calculator: https://www.secondstrike.com/Technic...leanerCalc.asp

I can confirm those where actual results, less then a few minutes apart on a brand new Dynojet chassis dyno. Real world, real wheel HP data. Somewhere in my old files I may have the torque numbers to go along with this.
As a side note, the numbers above where done before we had a K&N or Green Filter-14" filter top. The filter top would had a huge amount of airflow vs the chrome lid that was used at the time of the chassis dyno runs.

Bill S.

[DanEC]

Originally Posted by cycleguy55

Has anybody ever put these on a flow bench to evaluate how restrictive they really are - or aren't?

Edit: I just found this, posted to https://www.ffcars.com/forums/17-fac...r-cleaner.html by 'mrmustang'. Hmmm....

Back to the original question, and dating back over 18 years
427 center oiler, 10:2:1 compression, 650 holley DB (already dyno tuned) fairly mild street cam as a base for the test on a "chassis" (not engine) dyno. This was done as we were baselining a new chassis dyno at a friends shop and thought it would be interesting to be able to show his customers the difference of what something as simple as an air cleaner could make.

My notes are as follows:

no air cleaner: 322hp
then 14X2 "K&N" air cleaner: 314hp
then 14X4 "green" air cleaner with drop base:324hp
then Stelling and Heller air cleaner (stock filters as we did not have K&N or Green filters in stock at the time):302hp

All of the above were done one after the other. No tweaks or changes where done to the carb or engine timing. Strictly a demonstration for about 20 customers who were at the shop that Saturday. All HP above was measured at the rear wheels.

The car was ERA321, dark blue metallic, running a toploader 4spd and 3:31 rear gear ratio.


Second Strike Air Cleaner Calculator: https://www.secondstrike.com/Technic...leanerCalc.asp

It would be interesting to see a similar comparison on a car with dual 600 quads. One of these S&H filters does seem horribly inadequate (it's basically a Yugo size air cleaner) but my own rational is two of them with a pleated air filters and no restrictive screens on a 500 HP motor would not suffer as much loss. The twin 600 cfm carbs would certainly seem under taxed feeding a 428- 460 FE with a peak rpm in the mid - to high 5,000 rpm range.

[HTM101]

Originally Posted by DanEC

It would be interesting to see a similar comparison on a car with dual 600 quads. One of these S&H filters does seem horribly inadequate (it's basically a Yugo size air cleaner) but my own rational is two of them with a pleated air filters and no restrictive screens on a 500 HP motor would not suffer as much loss. The twin 600 cfm carbs would certainly seem under taxed feeding a 428- 460 FE with a peak rpm in the mid - to high 5,000 rpm range.

When my Cobra was first ready to drive, it had a single 4-bbl. on a Sidewinder manifold with 1 S&H air filter.

Several years later I put a 2x4's Tunnel Wedge intake on it, and installed a 2nd S&H air filter. Couldn't believe it was the same engine. Very noticeable seat of the pants feel.

[my427cobra]

Larry. I think it is the same size so let's use the 51% number. Still a big improvement going to a 79% SS mesh.

And of course the SS mesh top ads a lot.

Cheers
Greg

[LMH]

Originally Posted by my427cobra

Larry. I think it is the same size so let's use the 51% number. Still a big improvement going to a 79% SS mesh.

And of course the SS mesh top ads a lot.

Cheers
Greg

Definitely! I was more curious if the air cleaner had ever been tested with just the screen in place and no foam, then adding different foams to see what flowed the best. Like you say though, its not going to equal the top flowing air as well, I was just thinking of originality.
Larry

[Kit Coyle]

What do you think the benefit would be if the Stelling & Hellings air cleaner
unit was used with the K&N 2570 filter but with the restrictive drilled steel screen
removed...no screen at all...just the filter holding up the chrome lid. This
has to increase the air flow somewhat and the stock look would be largely
preserved. Too bad dyno time is so expensive or we could get some more
definitive answers!

[my427cobra]

Hi Kit Coyle. In the previous posting I started on the S&H air filters I showed this comparison:



And a cheap K-mart paper air filter fowed almost as well as a K&N in a dyno test.

It's all about ppi (pores per inch).

The K&N filter you suggest is too high for my application and, well truth be told, I don't like the purple color.

So I'm zeroing in on my SS mesh sides and top and high flow foam filters.

Next stop: I'll get to work on my hood scoop mold and make my hood scoop.



Cheers
Greg