[DeTomaso] Pantera Air Cleaner

[cengles at cox.net]

Dear Mike,


                I read the SpeedTalk Engine Tech website.   I used to 
have the K&N X-streme top on both of my engines' air cleaners.  Then I 
noticed at least two discussions on Engine Tech that dealt with the dyno 
proven HP reduction when using them.   The HP loss was 6-9 HP verified 
by different engine builders on different dynos on different engines. 
I suspect that although the concept is appealing, the loss may be due to 
turbulence above the carb.  In any event, the X-Streams are boxed up and 
I now use conventional shiny simple chromed K&N air cleaner tops....... 
X-Stream.  A good idea, that somehow doesn't work.


                           Warmest regards, Chuck Engles


On Tue, Jul 21, 2015 at 10:38 PM, Mike Drew via DeTomaso wrote:

> In a message dated 7/21/15 17 47 17, michaelsavga at gmail.com writes:
>
>
>>
>> 
>> http://www.carid.com/knn/xstream-air-cleaner-assembly-3-1-8-height-mpn-66-3050.html?gclid=CJbG_rfB7cYCFZYWHwodBE8JuQ
>>
>>
>
>>>> Somebody (I think it was here?) posted a link to objective testing 
>>>> which
> revealed that the pleated air cleaner lid actually reduced horsepower 
> when compared with the same filter and a solid lid, which sounds 
> counterintuitive.   Apparently the airflow is disrupted somehow with 
> the pleated lid?
>
> A quick Google search found some oblique references.   From a Hot Rod 
> magazine article:
>
> Also interesting is that Westech's Steve Brule mentioned that on 
> previous dyno tests with the XStream Air Flow Top that it seems to 
> work best when combined with flat-base air cleaner assemblies. 
> Conversely, he has seen a slight power loss when the same lid is 
> combined with drop-base air filter assemblies. We did not test a 
> drop-base air filter assembly to verify this point.
>
> From a drag race forum:
>
> Edelbrock Drop base, with k&n filter and lid 400 SBC with Edelbrock 
> AVS 800. Filter top is approx 1-3/8 above choke top.
>
> K&N 14x3 with chrome top: 12.157 @ 111.92 60ft 1.777
> Same filter with Xtreme top: 12.301 @ 111.46 60ft 1.850
> back to chrome top: 12.159 @ 112.03 60ft 1.805
>
> I logged the runs with my LM2. I did notice that the mixture richened 
> up about .3 with the xtreme top, which tells me that I was actually 
> hurting air into the carb. The lid also caused a hard bog off the 
> line, which you can see in the 60 ft time and ET. No stumbles with 
> standard top.
>
> And so on and so forth.   I can't find the link to the article/test 
> that I'm thinking of though.   I do remember it was very illustrative 
> and definitive--and surprising to me.
>
> Mike
>
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