[DeTomaso] Air cleaner drop base needed (was: Posting)

[Mike Drew]

Fred,

Fortunately your problem is simple and inexpensive to solve. 

My wife’s Pamtera #1765 also has a K&N filter setup.  Out of the box it would not fit under the screen because the base had zero drop (that is, the bottom of the air cleaner was at exactly the same height as the top of the carb).  However, it’s possible to get replacement bases with a variety of different heights, and by choosing the correct one it’s easy to achieve this:



If you choose a base with insufficient drop the lid won’t clear the screen. If it’s too much, the underside of the base will rest directly atop the spark plug wires on the distributor cap, leading to spark jump and ignition problems. There is a just-right height which differs depending on your intake manifold, air filter height, use of carb spacers etc.   You want about 1/4 to 1/2 inch clearance from the plug wires at a minimum. 

Here is a direct link showing all the drop bases of various heights offered by Summit:

https://www.summitracing.com/search/part-type/air-cleaner-bottoms/air-cleaner-size/14-in-diameter/base-style/dropped

Note various drop heights are listed on the left side of that screen. 

Do a little figuring and perhaps order 2-3 with varying amounts of drop (which, if I’m honest, is easier than taking a bunch of measurements) and only keep the one that works best and return the others. Or, you can measure the existing clearance from the underside of your base to the distributor, subtract 1/4-1/2 inch from that value, then order a single base with that amount of drop. 

This all assumes a filter that isn’t excessively tall. If needed you can also get shorter filters, but you need to pay attention because if your base has to much drop and you’re filter is too short, the underside of the air cleaner lid will practically rest atop the carb and you won’t be able to get adequate airflow (and if it’s REALLY too shirt you won’t be able to assemble everything). 

Let us know how it works out!

Mike


Sent from my iPad

> On Mar 1, 2022, at 09:40, Fred Sweeney <fred at creekspeak.com> wrote:
> 
>    Hi, I would like to post the following on the POCA site.
> 
>   "I have a K&K (?) oversized round air cleaner on my Holley. It is a
>   tall profile. I don't expect to get another air cleaner under a screen
>   on my 1972 but would like something smaller, shorter, or a different
>   profile. My engine is basically stock so performance isn't a big issue.
>   Yet, I don't want to starve the engine with a tiny cleaner. Any
>   suggestions? Thanks."
> 
> 
>   Fred Sweeney
>   [1]fred at creekspeak.com
>   Visit my website: www.creekspeak,com
> 
> References
> 
>   1. mailto:fred at creekspeak.com
> _______________________________________________
> 
> 
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-------------- next part --------------
   Fred,

   Fortunately your problem is simple and inexpensive to solve.

   My wife's Pamtera #1765 also has a K&N filter setup.  Out of the box it
   would not fit under the screen because the base had zero drop (that is,
   the bottom of the air cleaner was at exactly the same height as the top
   of the carb).  However, it's possible to get replacement bases with a
   variety of different heights, and by choosing the correct one it's easy
   to achieve this:

   [cid:7465ADF0-E117-4EB4-A78E-51BC07F0B3E1-L0-001]

   If you choose a base with insufficient drop the lid won't clear the
   screen. If it's too much, the underside of the base will rest directly
   atop the spark plug wires on the distributor cap, leading to spark jump
   and ignition problems. There is a just-right height which differs
   depending on your intake manifold, air filter height, use of carb
   spacers etc.   You want about 1/4 to 1/2 inch clearance from the plug
   wires at a minimum.

   Here is a direct link showing all the drop bases of various heights
   offered by Summit:

   [1]https://www.summitracing.com/search/part-type/air-cleaner-bottoms/ai
   r-cleaner-size/14-in-diameter/base-style/dropped

   Note various drop heights are listed on the left side of that screen.

   Do a little figuring and perhaps order 2-3 with varying amounts of drop
   (which, if I'm honest, is easier than taking a bunch of measurements)
   and only keep the one that works best and return the others. Or, you
   can measure the existing clearance from the underside of your base to
   the distributor, subtract 1/4-1/2 inch from that value, then order a
   single base with that amount of drop.

   This all assumes a filter that isn't excessively tall. If needed you
   can also get shorter filters, but you need to pay attention because if
   your base has to much drop and you're filter is too short, the
   underside of the air cleaner lid will practically rest atop the carb
   and you won't be able to get adequate airflow (and if it's REALLY too
   shirt you won't be able to assemble everything).

   Let us know how it works out!

   Mike

   Sent from my iPad

     On Mar 1, 2022, at 09:40, Fred Sweeney <fred at creekspeak.com> wrote:

     Hi, I would like to post the following on the POCA site.
     "I have a K&K (?) oversized round air cleaner on my Holley. It is a
     tall profile. I don't expect to get another air cleaner under a
   screen
     on my 1972 but would like something smaller, shorter, or a different
     profile. My engine is basically stock so performance isn't a big
   issue.
     Yet, I don't want to starve the engine with a tiny cleaner. Any
     suggestions? Thanks."
     Fred Sweeney
     [1]fred at creekspeak.com
     Visit my website: www.creekspeak,com
   References
     1. mailto:fred at creekspeak.com
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
   DeTomaso mailing list
   DeTomaso at server.detomasolist.com
   http://server.detomasolist.com/mailman/listinfo/detomaso
   To manage your subscription (change email address, unsubscribe, etc.)
   use the links above.
   Members who post to this list grant license to the list to forward any
   message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.

References

   1. https://www.summitracing.com/search/part-type/air-cleaner-bottoms/air-cleaner-size/14-in-diameter/base-style/dropped
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