<VV> cht and oil temp question

Mon Aug 6 15:44:43 EDT 2012

Ron, I think he meant a 12 inch long bit. Mark Durham

Sent from my Windows Phone
From: Ron
Sent: 8/6/2012 11:46
To: Stephen Upham
Cc: virtualvairs at corvair.org
Subject: Re: <VV> cht and oil temp question
How could you deflash the 1/8" openings which are the critical ones with a
1/2" bit?  It's the small openings way down that are clogged with flashing.
I'd suggest that you look at it again.
RonH

----- Original Message -----
From: "Stephen Upham" <contactsmu at sbcglobal.net>
To: <virtualvairs at corvair.org>
Sent: Monday, August 06, 2012 7:13 AM
Subject: <VV> cht and oil temp question

>I have a '65 Monza 110 PG that has about 10,000 on the last rebuild.  I
>deflashed the heads using a 12" drill bit.  It cleaned the passages very
>well and left tiny irregular groves to increase turbulence.  I got about a
>half a cup of flashing out of the heads.  Since it is a factory A/C, it has
>the 12 plate oil cooler.  I do not have the A/C compressor or condenser
>installed (money/time thing). When I got the cooler from a trusted west
>coast vendor, I was assured that it was completely flushed.  After I
>received it in the mail, I shook it ,and it sounded like a baby rattle.  I
>ran a magnet though the debris that came out of it, and found that it was
>indeed ferrous.  lI flushed that baby (the oil cooler) by filling it with
>paint thinner and setting it in a mop bucket and pouring hot water slowly
>into the bucket; a process not for the faint hearted. I did that about ten
>times.  I then flushed it out with a water hose, and finished the job by
>using compressed air to dry the pass
> ages.  I have a Clark's deep/finned oil pan.  I have two oil temperature
> gauges (long story).  The sender for the first one in located in the area
> mentioned in the Tech Guide in the triangular area in the back right hand
> side of the block just above the lip of the oil pan.  That is attached to
> a water temp under dash gauge (not something I thought of - again, long
> story),  The second one is on the oil pan at the bottom back of the pan.
> The block location usually stays in the 220-260 range depending on load,
> ambient temps, and driving conditions.  The oil pan location varies
> between 160 and 190.  I really don't have an explanation for the
> difference in the spread at the higher temps, but my figures here are
> based on memory, so actual recording may prove there is a more 1 to 1
> ratio.  I also have a Falcon dual CHT gauge.  I placed the senders around
> the base of spark plugs #'s 3 and 5.  The sender connection to the wire
> leading to the gauge in the cabin is located in the engi
> ne compartment. The locations at the bases of the plugs don't provide the
> exact temps, but I am only looking for a variation from normal, and so
> they serve their intended purpose to show any unusual increase in temps.
> The normal temps on these are 220, and they usually remain the same, not
> varying more than 5 degrees one way or another though all driving
> conditions.  I use 30w Brad Penn oil; the "green oil".  I have been using
> it since break-in.  I live in Dallas, Texas and the average temps in the
> summer are at or above 100.  I get my highest readings when I am driving
> on the highway and then suddenly get stuck in stop and go traffic.  I
> usually remove the lower shrouds in early April and reinstall in late
> October.  I don't know the exact difference in temps by doing this as I
> have never taken the time to do a same day or similar day comparison, but
> I understand it can reduce running oil temps by 20-30 degrees.  Also, if
> you are rebuilding the engine, the piston to cylinde
> r clearance is critical. If the clearance is even a minute fraction too
> tight, when the heating of the engine causes the pistons to expand, they
> reach the point where the extra drag causes the rod bearings to stress and
> fail.  Ask me how I know.
>
> In my opinion having lost an engine to overheating, more gauges
> strategically placed monitoring different types of heat are better than
> fewer gauges or, heaven help you, just the "idiot" light.  In addition,
> making sure that all cooling passages, and coolers are clean and
> unobstructed, and that quality oil and proper air flow is maintained will
> make for a happy engine and happier owner.
>
> Hope that helps,
>
> Stephen Upham
> NTCA / CORSA / Dallas,Texas
>
> Message: 7
> Date: Sun, 5 Aug 2012 16:46:49 -0700
> From: Mark Durham <62vair at gmail.com>
> Subject: <VV> cht and oil temp question
> To: Virtual Vairs <virtualvairs at corvair.org>
> Message-ID: <1991566529745791000 at unknownmsgid>
> Content-Type: text/plain; charset=ISO-8859-1
>
> OK, all of you that have oil temp guages on their Corvair engines, could
> you send me what your normal oil and cht temps are, warmed up? and if you
> have done anything to the engine to help with oil temps, (larger oil
> cooler, finned valve covers or finned/deep pan?) and what brand and weight
> of oil.
>
> I have not installed any guages yet and I am trying to educate myself/make
> sense of the cSt figures on oils by comparing those viscosity ratings to
> what temps we see "real world".. In our engines
> Thanks in advance Mark Durham
>
> Sent from my Windows Phone
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