Yes Dan .
Cool air to the carbs improve performance and Filtered Air reduces wear by
a factor of 2 or so, (from what I recall by a talk by a specialist filter
guy, Hadyn Gooch from Unifilter Australia). UA are totally seperate from
Unifilter USA and do all their own manufacturing and quality control (so
don't compare with the USA company) they actually supply Filters to BMW
Team Europe.
If you use an air box with a force feed from the air at the front of the
car the flow will vary by speed, a small amount of pressure will be OK but
thare is a danger of 1/ providing too much pressure to the rear carb
(partic with a solex) 2/ giving everything too much air so that the fuel/
air mix varies with road speed.
A part solution is to have the rear of the air box open or filtered. BTW,
the racing BMW's use a gate and pressure sensors at the rear of the Air Box
to solve these problems and that is computer controlled.
It gets more complicated with you poor people with LHD cars with the
steering in the way.
I know of no measures, just a lot of prformance measurement and playing
around.
A simple step for a road car is double the element thickness on a standard
filter element then add just a small piece of say 4" air cond ducting form
the front of the rad to point at the air filter area, (you may need to
relocate the radiator overflow to the RHS which is a minus for
originality).
Allways run with a heat shield (STD) and or exhaust wrap for performance.
(I have a ceramic coated headers (in and outside to further aid heat
efficiency).
Hadyn Gooch promised to make a double thickness reusable foam filter. so we
may be able to get these soon.
Give Hadyn a mail, it may encourage him to develop more great filter stuff
for us roadster owners.
Hadyn is also current president of Datsun Sports Owners Australia (NSW)
with a beaut white roadster (giving business to a fellow roadster guy is
good)
PS this is based on my Roadster that proably has more race successes than
any other currently racing in Australia.
Regards,
Howard Fletcher
3 SR311 RHD solex , (ie race Road and wreck)
-----Original Message-----
From: Daniel Neuman [SMTP:dneuman@stars.sfsu.edu]
Sent: Saturday, 16 October 1999 3:29
To: datsun-roadsters@autox.team.net
Subject: Armchair Engineering..
Hello All,
At Shasta at the 510 show I noticed that a lot of the 510 guys had
a strange airfilter set up. It look like they had a sealed airbox over the
carbs with a large diameter hose ~2" coming off the forward part of it and
going forward to infront of the rad. ending in a little K&N cone air
filter.
My first question is why?? Does this have some performance enhancing
effect??
Second question: How could you calc. the amount of air being sucked
into the tubing?? If the engine in question was a roadster?? I'm looking
for cubic feet per minute or something like that.
Thanks,
Daniel 69 2000
SF CA
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