Reciprocating engine deterioration at altitude
Reciprocating engine deterioration at altitude
(OP)
Hello everyone,
Is anyone aware of how the output of turbocharged reciprocating engines deteriorates with the site elevation?
I am using std atmosphere figures and at 400 m the reduced air density will certainly lower the massflow entering the the cylinders, and I am wondering how engine manufacturers claim to maintain power output at higher elevations.
Regards
Is anyone aware of how the output of turbocharged reciprocating engines deteriorates with the site elevation?
I am using std atmosphere figures and at 400 m the reduced air density will certainly lower the massflow entering the the cylinders, and I am wondering how engine manufacturers claim to maintain power output at higher elevations.
Regards





RE: Reciprocating engine deterioration at altitude
good luck!
-pmover
RE: Reciprocating engine deterioration at altitude
The manufacturer will match the turbocharger to the conditions to ensure the best performance.
A good rule of thumb is that output will drop by 1% for every 100m increase in altitude, so you are looking at a 4% drop in output.
Hope that helps.
RE: Reciprocating engine deterioration at altitude
Some Turbochargers has got a mechanism called waste gate mechanism. At sea level it will by-pass most of the exhaust gases and when the altitude increases (atmospheric pressure drcreases)most of the exhaust gases will pass through the turbocharger turbine and turbocharger will give more mass of air so that to compensate the density reduction. So that constant power output is maintained throughout the altitude range specified.
KMPillai
RE: Reciprocating engine deterioration at altitude
Hi
Suggest you also check out ISO 3046/BS5514/DIN 6271.
Generally there is no derate for the altitudes you have
Ed
RE: Reciprocating engine deterioration at altitude
Some years ago I travaled for few weeks in Tibet at 4,700 meters and the car had to be adupted to the low air (we have to do it too...)