cylinder pressure
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Teching In
Joined: Jun 2002
Posts: 45
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From: Stavanger , Norway, Europe
cylinder pressure How do you calculate cylinder pressure @ a given RPM ?
If you have a complete Torque graph, and you know bore, stroke is there a way to estimate the amount of cylinder pressure engine is making on the different RPM`s
I have a TT setup that produces serious amount of torque low down, lot less upper in RPM range (turbo is to small)
As long as i can keep the engine living and surviving the cylinder pressure it must have @ 3600 RPM`s (1036 rwtq) and found a turbo that could deliver enough airflow @ higher RPM`s i should see some serious power higher up ??
Today i make almost the same HP level @3600 as i do @ 5500
regards
Rune
If you have a complete Torque graph, and you know bore, stroke is there a way to estimate the amount of cylinder pressure engine is making on the different RPM`s
I have a TT setup that produces serious amount of torque low down, lot less upper in RPM range (turbo is to small)
As long as i can keep the engine living and surviving the cylinder pressure it must have @ 3600 RPM`s (1036 rwtq) and found a turbo that could deliver enough airflow @ higher RPM`s i should see some serious power higher up ??
Today i make almost the same HP level @3600 as i do @ 5500
regards
Rune
TECH Regular
Joined: Oct 2005
Posts: 430
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There's a bunch of different actual 'cylinder pressure' values for an engine. A pressure transducer in the cylinder would read anywhere from perhaps negative 5 or more psi during the intake stroke up to around 1,000 psi at around 15 to 18 degrees after TDC on the power stroke for a typical N/A engine at WOT. Boosted, the numbers go much higher, as much as 15,000 psi for a blown nitro Top Fuel engine!
There's also Brake Mean Effective Pressure, which is a fictional value for comparing the relative efficiency of different engines' power production. It is the pressure which, if applied steadily through the whole power stroke, in the absence of pumping and frictional losses, would result in the actual SAE-corrected horsepower.
There's also Brake Mean Effective Pressure, which is a fictional value for comparing the relative efficiency of different engines' power production. It is the pressure which, if applied steadily through the whole power stroke, in the absence of pumping and frictional losses, would result in the actual SAE-corrected horsepower.
