Just to throw in a couple of Australian cents (worth about one of yours), I
thought I'd re-mention some observations from the guys here in Melbourne.
I don't know enough about the SU's, but the Solex cars have been dyno'd
here, and it was found that the standard setup flowed exceptionally well -
better than K&N, better than foam socks on the trumpets. Partly because the
intakes already have good trumpets in them, and the only way they could
significantly improve on the flow was to put two paper filters in the
assembly, rather than one - greater airflow, same filtering.
However, that option isn't much available to earlier (pre '69) cars such as
mine, as the engine mounts are slightly different, and their isn't quite as
much room between the engine bay wall and the carbs as their is in later
cars. Bummer for me.
Seems to me, (IMHO) that fiddling a lot with the induction side (of Solex
cars) is an excercise in detail, when the exhaust is what lets these cars
down (in terms of overall flow), and can yield greater returns (unless
you've already dealt with that).
Dunno if that helps
Cheers,
Steve
(68 2000 Solex)
>From: "Chris Robertson" <ckrobertson@hotmail.com>
>Reply-To: "Chris Robertson" <ckrobertson@hotmail.com>
>To: svgkm@halley.ca.essd.northgrum.com
>CC: ronday@home.com, Fred_Katz@ci.sf.ca.us, datsun-roadsters@autox.team.net
>Subject: Re: Carb stack socks
>Date: Tue, 10 Jul 2001 22:29:34 -0500
>
>Yep, I remember that post. It wasn't a study, but a story. It had no real
>data and no analysis. In addition, the way it was written was obviously
>biased against K&N for whatever reason.
>
>Anyway, the modern K&N fiters use oiled cotton, not foam. They seem to be
>widely accepted. Other than that one story, I've never heard of any
>evidence against using them.
>
>Chris
>
>
> >From: Gary McCormick <svgkm@halley.ca.essd.northgrum.com>
> >To: Chris Robertson <ckrobertson@hotmail.com>
> >CC: ronday@home.com, Fred_Katz@ci.sf.ca.us,
>datsun-roadsters@autox.team.net
> >Subject: Re: Carb stack socks
> >Date: Tue, 10 Jul 2001 12:50:21 -0700
> >
> >I used to use them, too on racing motorcycle engines that were torn down
> >and rebuilt
> >frequently, but for long-term use they have been shown to pass an
> >unacceptable amount of
> >the finer, engine-grinding size of crud that a racing engine can tolerate
> >for its short
> >span between rebuilds but a street engine is best off without.
> >
> >This issue has come up on the list a number of times in the last few
>years,
> >and I remember
> >one list member citing a study that was conducted by a company he had
> >worked for on their
> >fleet of trucks. Oil analysis showed that the oiled foam filters passed
>an
> >unacceptable
> >amount of particulate matter and they went back to conventional filters.
> >
> >gary
> >
> >Chris Robertson wrote:
> >
> > > What do you mean well known? K&N's are the choice of many racers as
> >well as
> > > turbo/supercharger manufacturers. What is the reasoning, or evidence?
> > > Would really like to know as I use them!
> > >
> > > Thanks,
> > > Chris
> > >
> > > >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
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
>
>_________________________________________________________________
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