[Supras] Oil accumulator vs. pumping air

[Patrick Golder]

Hi Bernie,
   
  I'll second what Jeff says.  I've driven my 88 Supra in dozens of track days at Watkins Glen, which has lots of turns with elevation changes, and have never experienced any oil starvation.  I really don't think you need to worry about it.  Aside from the head gasket, these cars are pretty bulletproof.  Drive it and enjoy it!
   
  Patrick
   
   
  ------------------------------

Message: 2
Date: Fri, 7 Dec 2007 16:25:31 -1000
From: "Jeff Mohler" 
Subject: Re: [Supras] Oil accumulator vs. pumping air
To: berniek at technicaldevelop.com
Cc: "Supras at supras.com" 
Message-ID:

Content-Type: text/plain; charset=ISO-8859-1

Bernie..whats the facination with adding Detroit style fixes to
problems that do not exist?

I _race_ cars, and short of my Super Unlimited TransAm that is burning
580 ground HP on 12" wide goodyear slickes around the tracks, ive
-never- seen or heard of any "deceleration, acceleration, or
cornering" oil control issues on anything short of my class, other
than 3000GT's. Which..are chronic with hard enough track use.

You do -not-, and will -not- have enough braking or rubber in a MK3
without significant upgrades on both of those (including R compound
rubber) to decelerate that fast, or..corner a supra that fast.

I _applaud_ you for wanting to throw money at it, but..youre adding
complexity, a mess, and..well, headache to what will be a VERY clean
and fun, reliable, car..if you just drive it as is.

Serious..if youre going to visually determine that in "from all
appearances" there is a problem, then youre doing a hell of a lot more
gassing, braking, and cornering than anyone has ever been able to get
out of any supra...anywhere. And on hundreds of HP less.


Id be more worried about the lead in your oil, than a starvation issue
that people on 2-3x your HP range have never experienced.



On Dec 7, 2007 4:19 PM, berniek at technicaldevelop.com
wrote:
> Thinking of adding an oil accumulator (1-1/2 to 3 qt.) to protect
> against starvation during high speed stops and cornering at the limit.
> I've already relocated the pickup as far back in the pan as it will fit,
> necessitating cutting back the baffle. The baffle angle was so shallow
> that from all appearances, oil would not flow back to the pickup under
> hard acceleration. So under acceleration, I should be OK. Its pulling
> the speed down from over 3 figures in MPH and cornering that I'm trying
> to address. I've had instances in the past where cornering with another
> car ran the oil up the side of the pan, evidenced by hydraulic lifters
> getting noisy suddenly.
>
>
> The question is this: Since, the oil pump is in good condition and will
> have oil wetted gears, what is to keep it from pumping air at 60-70 PSI
> during conditions at high engine speed when it becomes uncovered? Under
> those conditions, the accumulator will not be of any value. Yes, air is
> compressible, but it can also be pumped by a positive displacement pump
> in good condition (i.e., the sump oil pump).
>
>
> Really looking forward to answers to this one. Thanks.
>
>
> Bernie

End of Supras Digest, Vol 48, Issue 11
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