Today I got around to Modifying a Model A air filter for my Speedster . Sometime in the past , someone ( I wish I could remember who) used a 1-1/4 sink drain pipe. I used that as a basis as it fits very nicely in the Holley NH without interfering with the linkage or choke plate. I used a #55 o-ring at on it . I used a Master pro Water hose part number 20801 available at Kragen / O'Reilly . You need to cut the rubber water pipe so you have just a 90 degree part. The 1-1/4 pipe fits nicely into it and the wider end fits nicely in the pressed steel part of the Model A filter. I used a 8-32 x 2-1/2 inch bolt to lock the rubber pipe into the air filter with a bit of RTV black silicone on the inside to make it air tight . I used a 5/32 eye bolt with an 8-32 lock nut inside the metal pipe as a mounting point for a spring that helps hold the pipe into the carb throat. I used a large piece of round stock threaded for 10-24 at one end to make a large eye bolt to mount the filter to the frame . I also used a 1-3/4 hose clamp on the rubber hose / metal pipe . All in all, it seems to be very functional and not too ugly. I used K & N air filter oil on the Model A air filter. If I was driving in really harsh dirty conditions I might add a foam cover over the Model A filter .
Great looking car, Dan!
I went one step further and bought a K&N. Trouble is, it needs cleaning, and I'm not into doing that. Wish I could find a paper filter that size.
Thanks Rick.... I agree the K & N is much better, but I'm trying to keep with a more vintage look. I was going to use all 1-1/4 sink pipe, but the added flexibility of the radiator hose is such a plus. God knows that our cars have enough rattles without adding more !
Is there a reason you couldn't run a similar K&N from the same location you have your air filter in? A different hose and you could run a K&N a little further back and it'd be completely hidden by that skirt unless you're underneath the car. Just a thought, I like the idea though.
No reason... just trying to use vintage or vintage style materials in keeping with period speedsters. The Model A filter is , I believe, an aftermarket accessory from the period that is reproduced today. I'm not so concerned with dirt and dust , but I am concerned with fire from some catastrophic backfire .... see attached .....