<VV> 84hp powerglide MPH--------140 conversion?????

[corvairs]

Hey Tim, And of course there are those that will chime in that they've 
used 140's in their FC's and everything is fine. I have no reason to 
doubt them. The point is, everything needs to be put into perspective.

If you have 2 Corvair engines,  a 110hp and a 140hp that are identical 
so far as their condition is concerned, and you put each in an identical 
2 FC's, what will PROBABLY be the outcome?

The 140hp will PROBABLY not last as long. That's because 140hp engines 
have a greater tendency to  run hotter and drop valve seats than a 110 
engine. That's just simply a fact. Does it mean that you will almost 
certainly lose the engine to a dropped valve seat? Not at all. If 
certain precautions are understood and taken, you may get good life out 
of a 140 in an FC. BUT THE FACT REMAINS it will be more likely that the 
motor will not hold up as well as a 110. That's really all anyone should 
be saying.

These are facts that should be kept in mind when making an engine 
choice. If you simply want more hp and/or the "gee-whiz" of having a 140 
in your FC, then go for it - But do it with the full understanding that 
it MAY be more difficult to get the same reliability as a 110 in the 
same application.

Lon Wall
www.corvairunderground.com






hortle wrote:
> Everything I have heard says the 140 PG engine is NOT a good match for an FC.I started to inquire about the situation after dropping #5 intake valve seat at five in the morning with ambient temp. around 35 degrees F. This was on an engine rebuilt about 3,000 miles before this happened.This on the way to the Corvair Palm Springs meet in 2007. Now I am running the same engine but with 1965 95HP heads.To and from Ventura I averaged 21 mpg but more importantly it was very reliable (about 1900 miles in 10 days) except for my fan bearing coming up out of the top cover. Sorry but I am done with 140's. I want reliability.
> Timothy Shortle in Durango Colorado 
>
> -----Original Message-----
>   
>> From: Bryan Blackwell <bryan at skiblack.com>
>> Sent: Jul 30, 2008 11:10 AM
>> To: Mike Moyer <vairvert67 at yahoo.com>
>> Cc: virtual vairs <virtualvairs at corvair.org>, corvanatics <corvanatics at corvair.org>
>> Subject: Re: <VV> 84hp powerglide MPH--------140 conversion?????
>>
>> Everything I've heard says the 140 PG engine is a good match for an  
>> FC.  The only things that aren't a bolt in are the side shrouds  
>> (you'll need to cut a set of two carb ones) and the air filters.   
>> There are quite a few examples of 140 FCs out there, so you should be  
>> able to find an air filter setup you like.
>>
>> --Bryan
>>
>> On Jul 30, 2008, at 1:27 PM, Mike Moyer wrote:
>>
>>     
>>>  I need to pull the engine due to an oil leak so am thinking about  
>>> installing a rebuilt 140hp powerglide motor I had slated to install  
>>> in a 68 coupe(Sold the car due to to many projects so engine just  
>>> stilling there)
>>>       
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