Ed;
For a bench-top magnifier, I'd recommend using an old Olympus microscope
(the model is SZ-1, I think). These are binocular (you get to use both
eyes) and have a long "working distance" as well as a good depth of
field and image brightness. There is a ring around the body that rotates
to zoom the magnification from 0.7 to 4.0 and I usually use 10x
eyepieces. This gives a good zoom range for macro work.
These scopes are sometimes found on the surplus market and are usually
priced right.
Regards, Neil Tucson, AZ
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of The Weldons
Sent: Tuesday, July 27, 2004 8:23 PM
To: land-speed@autox.team.net
Subject: Motorcycle main jet sizes
You guys who want to get deep into how your jets flow--Look closely at
the
edges of the inlet side of the jet hole. Do a little research into
liquid flow
through orifices and you'll see how much effect the edge of the hole has
on
flow. Engineers quantified this in the old days (my time) with
efficiency
factors called "discharge coefficients". These were determined by flow
tests.
Nowadays they use CFD (computational fluid dynamics) software. Kind of
pricey
for us racers unless you work in that trade.
One thing that can help is a good low power microscope. Around 15-30x
magnification will show a lot down in the one mil range while having
enough
depth of field to let you hand hold and move around what you're looking
at.
Good buys can be found on ebay. I found my two binocular scopes at
machinery
dealers, one for $300 and a smaller one for the shop for looking at tool
cutting edges for $40. Needs to be better than the little hand scopes
guys
use to check their plugs. In my engineering job I spent a lot of time
being
amazed at how mechanical features looked at 30x magnification under a
binocular microscope.
Ed Weldon
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