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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 _________________________________ 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 ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com