RE: whats wrong with my engine

["Erkson, Toby" <toby.erkson@intel.com>]

Tuning the engine at one elevation, say sea level, then driving to a
different 
elevation, say Jackson, will show engine variations.  This is the problem
with 
carburetors and why fuel injection is so much better.

When going from a dense air mass (sea level) to a thinner air mass the
engine 
will experience a lean condition.  It will experience a rich condition if
tuned 
at a higher elevation and brought to a lower elevation.

Yes, you do need to retune the carbs.  If you don't it is possible to burn a

valve...ask me how I know.  For an engine a mile in elevation does make a 
difference (hell, even for a human it makes a difference -- go for a run!).
    Toby Erkson
    air_cooled_nut@pobox.com  <-- Please use this address for email
responses
    '72 VW Squareback 1.6L bored and stroked to 2.0L
    '75 Porsche 914 1.8L, ORPCA member
    Portland, Oregon, http://www.geocities.com/MotorCity/8501/

______________________________ Reply Separator
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Subject: whats wrong with my engine
Author:  Jeff Palmer [SMTP:vw_nut@hotmail.com]  at MSXGATE
Date:    4/3/98 3:03 PM

I've got the 1776, lightened flywheel, counterweighted crank with dual 
Dellorto's (can't remember the size but will look) in my 72 square, It 
was converted from fuel injection by the PO and now everyone tells me 
that 80 mph (my current top speed) is way too low. What could be the 
possible causes? With other cars that we have we see a large performance 
decrease when they are brought up to Jackson WY (6000 ft elevation) 
because of the decrease in O2, could this be the problem. It is at my VW 
mechanic now so I could talk to him and see what he thinks but some 
input would be nice

Thanks
Jeff "goin' too slow" Palmer

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