<VV> Wear- Warm up

BBRT chsadek at adelphia.net
Sat Oct 15 10:21:37 EDT 2005

I believe the key to engine longevity is quick warm-up like modern cars 
exhibit. Rings in particular are subject to both fuel and oil (And very high 
temperatures), while bearings for instance, unless oil is diluted by fuel, 
never see much in the way of combustion products. Were I to have a street 
Corvair (like I used to -both cars and FC's), I certainly would want a 
functioning shroud, door, thermostat and heater systems.  Especially in the 
colder months and more humid "cold" months like in wet Spring and Fall.  I 
believe the period of cold rain, where there is a lot of condensation, has 
to be the worst conditions for engines, due to the humidity and extreme 
temperature changes the engine sees from cold start-up thru hot operation 
and then cooling again with high moisture present.


Chuck S
----- Original Message ----- 
From: <djtcz at comcast.net>
To: <virtualvairs at corvair.org>
Sent: Saturday, October 15, 2005 10:11 AM
Subject: <VV> Warm up

> -------------- Original message -------------- 
>> Yeah, yeah, yeah, I know, I'm ruining my engine by having it warm up so 
>> slowly without the doors. I'm sure that's what has caused the dropped 
>> seats and the broken cam gear, the only problems I've had with the 
>> engine. At  240K miles the crank journals were still in spec, so I don't 
>> see that the  cold oil is killing me.
> The oil additive suppliers are sure fond of reminding me that some high 
> percentage of "engine wear" occurs at start up.  The best documented 
> explanation of that I've found is in the 2 volume MIT Press published 
> "Internal Engine" series by Taylor.  At some point Mr. Taylor describes 
> corrosive combustion products condensing on the cool cylinder walls.  I 
> think this explains the "wet" look that a hunk of steel take on when a 
> propane torch is first played on it.  The condensation causes the cylinder 
> wall to corrode on some macro scale each power cycle. While that is 
> occuring the ring and cylinder gleefully rip each other apart.  He 
> includes some charts showing  that when the cylinder wall gets above some 
> temperature (maybe 160 F, from feeble memory) the condensation, and thus 
> the corrosive/abrasive wear essentially ceases.  I'm not sure how any oil 
> or oil additive could help combat that.
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