#11
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Re: fuel air
Quote:
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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