K&Ns are well-known to pass as much crud as air... better to have a nice airbox
around
both carb mouths with room for the stacks and a good, high-quality filter
around the whole
deal.
Gary McCormick
San Jose, CA
Ronnie Day wrote:
> >Fred_Katz:
>
> > At the Shasta all-Datsun meet I saw a 510 with similar carb stacks and they
> > were covered with nylon stockings held by rubber-bands. How safe is it to
> > use these? I know they'll keep large pebbles out of the engine cylinders.
> > What about finer grit? Should I risk using nylon socks, or should I use the
> > more "professional" foam filters?
>
> Hi Fred,
>
> Sounded like everyone really enjoyed themselves on "The Hill". We're already
> planning for next year. We should even be bringing a 510. Yeah, I know.
> Ya'll will all believe it when we show up towing it. ;>)
>
> Anyway, the filters. I use old nylons all the time to make pop/blast
> filters for microphones. The reason is that they don't pas blast of air
> easily, but let sound pass freely. I would doubt they do a decent job of
> passing air, at least at higher flow rates like you'd see in a carb.
>
> As for the sock type filters I used them on the 42 DCOE we had on our
> original 510 and while they worked okay, there was a wire frame (looked like
> a large hair roller) that went inside the airhorn to prevent sucking the
> sock into the carb. Now I can't help but feel that the wire frame disturbed
> the airflow into the carb, particularly at higher RPM. Was is enough to make
> a huge difference? Don't know without tests, but for the real world probably
> not.
>
> An alternative would be to get some K&Ns (or others), possibly from APT down
> in Riverside. They have a wide variety of depths, diameters and offset base
> plates (if needed) to fit pretty much any installation.
>
> HTH, Ron
>
> Ronnie Day
> ronday@home.com
> Dallas/Ft. Worth
> '71 510 2-dr (Prepared Class Autocrosser)
> '73 510 2-dr (Street Toy)
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