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#11
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Thanks a lot
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Dante |
#12
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For generating power, we need both fuel & air.
On one given engine, the bottle neck is usually at the "air", not the fuel. So we'd better use up every bit of it.
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'97 Fiat Punto GT |
#13
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Just in case, you have a diesel, the role is reversed. You need more fuel - the bottle neck is fuel.
Tuning up the boost or using bigger interccooler may not give any more power (mechanical diesel).
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Richard L aquamist technical support |
#14
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I have dug out a few old pictures on combustion (spark ignition engine) that may be interesting:
Various spark configurations and flame developing and propagation speed: Burnt fraction after spark: ![]()
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Richard L aquamist technical support |
#15
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One more factor that will help you consume all your oxygen inside the cylinder - the burnt rate at various a/f ratios
(ref: Internal Combustion Engine Fundamentals - John B.Heywood. ISBN 0-07-028637-X ) ![]() Ignition timing had to be close to MBT (maximum brake Torque) timing to achieve maximum cylinder pressure (torque or power per RPM) ![]() Figure left shown Cylinder pressure versus crank angle for overadvanced spark timing (50deg), MBT timing (30deg), and retarded timing. Your a/f ratio will greatly affect the MBT timing due to slowing down of burnt rate. Figure right shown the effect of spark advance on brake torque at constant speed and (A/F), at wide-open throttle. MBT is maximum brake torque timing.
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Richard L aquamist technical support |
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