Hi Ian,
The reason is VERY simple. The amount of oil
injected is sort of proportional to the mean speed of the engine. As the
race engines spend most of their time between 7,500 & 9,500 RPM, there
is a propensity for the metering pump to empty the sump rather
rapidly, which can cause oil surge in a long race. Not a condition I
wish to contemplate.
So I use premix, but NOT a lot, and NOT
a synthetic 2 stroke oil either. We run around 250 -275:1 I just hate it
when the oil fouls the racing plugs on a cold day. Additionally, we
are using FMR (Factory Mazda Race) 3 mm carbon alloy apex seals, which
have a certain amount of self lubricity themselves, so I can get away with
less oil. As long as there is enough oil to transfer the heat from the
seals themselves to the rotor, then that is sufficient. As with many
things, like sealants, food, booze etc, more than enough is
often TOO much (air filters aside(}:>).
Cheers,
Leon
----- Original Message -----
Sent: Friday, April 29, 2005 7:26
PM
Subject: [FlyRotary] Re: Re : oil
injection pump
SNIP>>
Leon why do you use premix in your race
car?
Ian Beadle W. Australia
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