<VV> [fastvair] Engine Cooling

[jvhroberts at aol.com]

 For one thing, at those head temps, these engines will detonate like crazy! 

 

John Roberts
 

 

-----Original Message-----
From: Dave Keillor <dkeillor at tconcepts.com>
To: Virtual Vairs <virtualvairs at corvair.org>; fastvair <fastvair at yahoogroups.com>
Sent: Wed, May 23, 2012 10:59 am
Subject: [fastvair] Engine Cooling


  
    
                  
It's clear that GM knew that the high performance engines (turbo and 140)  had a tendency to overheat.  They discovered this, no doubt, during pre-production testing.  The logical thing to have done would have been to improve the cooling, but that would have cost time and money.  Instead, they took the cheap and easy way out, and simply increase the actuation temperature of the snap switch from 525F to 575F for those engines (and AC cars).  Out of sight, out of mind.  If 575F is a safe operating limit for the high performance and AC cars (it isn't!), why isn't it safe for the other cars?  It costs money to use two different part numbers.


The use of a 575F snap switch is, in my opinion, the single biggest reason for the high rate of dropped seats in the 140 engines.  You can run your 140 at 570F (which, in my opinion, is quite overheated) for long periods and for multiple cycles and never know it.  The turbos at least had a CHT gauge.  525F is unreasonably high, but 575F is ridiculously high.  Clearly, GM knew that the high performance engines ran hotter, but felt that setting the over-temperature indication just short of meltdown was a satisfactory solution.



-- 
Dave Keillor



    
             
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