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Re: Oil Pumps - Gear or Rotor?

To: "Blue One Hundred" <healey.nut@gmail.com>,
Subject: Re: Oil Pumps - Gear or Rotor?
From: "Bob Spidell" <bspidell@comcast.net>
Date: Fri, 11 Mar 2005 18:54:38 -0800
re:

"> I have 70,000 miles on my rotary vane pump and it still pumps as good
> as the day I put it in the engine."

Anybody know for sure if they are drop-in interchangeable?  Think I asked this
before, but my mental gears are a little worn ;)


bs

********************************************
Bob Spidell         San Jose, CA        bspidell@comcast.net
'67 Austin-Healey 3000             '56 Austin-Healey 100M
********************************************

Subject: Re: Oil Pumps - Gear or Rotor?


> Carlos -
> 
> The Gear driven pumps were put in later 3000s by BMC because they are
> cheaper to make.
> 
> The rotary vane pumps are better and tend to pump more oil more
> consistently over the entire RPM range, although at very high RPMs the
> gear pump is apparently better.
> 
> The rotary vane pump will last longer because the primary pump/mating
> surfaces are both hardened steel, so metal bits in your oil won't
> scratch the surfaces and decrease its ability to pump oil over time.
> 
> The gear pumps, on the other hand, use the soft aluminum body around
> the gears as part of the primary pumping action for the pump... this
> means if metal flakes get in your oil (which it will)... it will
> easily scratch & score the pump body and decrease its ability to pump
> oil over time... the gear pumps wear out over time.
> 
> I have 70,000 miles on my rotary vane pump and it still pumps as good
> as the day I put it in the engine.
> 
> Regards,
> 
> Alan
> 
> '53 BN1 '64 BJ8




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