Lotus Elan and Lotus Elan Plus 2 Forums

This was found on the TurboEsprit list.

http://www.evanscooling.com/html/npgPls.htm

Any thoughts? Sounds like it would be a lot less hassle.

Mike Geiger 66 S3 Coupe'... due for a coolant change anyway.

Looks pretty interesting. I went around on the site and came across a
viscosity comparison with a regular 50/50 antifreeze mix - at 50 deg. F the
50/50 mix is 5 cp (whatever that is) while the NPG+ is 58. As the
temperature drops, the NPG+ begins to zoom up almost exponentially versus
the traditional mix. Think this would cause additional strain on the
starting circuit at Northeast USA winter temps? Quotes prices start at $25
per gallon.

Jon Eckman
66 S3 SE

----- Original Message -----
From: "Michael Geiger" <***@***.***>

Sent: Thursday, January 20, 2005 3:07 PM
Subject: [LotusElan.net] Evans NPG+ Coolant

if it is thicker it might be a little stiffer for the water pump
impeller.
seems to me it would be more suited for a liquid cooled charge air
cooler.
i can't imagine using a vintage Elan powerplant in any guise to run at
the higher temps NPG claims it is best for as neither the design or the
metallurgy of the period up to the sustained temps where the cost of
NPG realizes any benefit.

scott



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The "cp" that John mentioned is a viscosity unit: the CentiPoise - which is
one-hundreth of a Poise.

Named after a French physician, Poiseuille, and then shortened to Poise for
use in chemistry and physics textbooks (i.e., an esoteric term, I thought).
Has anyone else seen the term CP or centipoise used in industry, especially
when applied to cars?

I'm a chemical engineer. Centipoise is the most commonly used viscosity
measurement used by those working in "English" units as opposed to SI or
metric. Even Poiseuille's name is ignored by the SI unit 'masters'.

Lubricants are more typically described in centistokes. Centistokes (cSt)
are similar to centipoise but adjusted by the specific gravity. Mechanical
engineers tend to use cSt and chemical engineers and scientists use cP.

Ken
'69+2 with BDR