Mean Specific Brake Consumption
12-02-2002, 04:48 AM
#1
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Mean Specific Brake Consumption
The h23a motor has a relatively low mean specific brake consumption, that means that the "safe" range of our motors on pump gas (92 octane) is around 300whp. However, the h22a's safe range is around 350-400hp. How does the h22a accomplish this and is there anyway to achieve a larger limit other then running a higher octane such as c16? Thanks in advance.
12-02-2002, 07:19 AM
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Re: Mean Specific Brake Consumption (Arturbo)
sounds to me like there are a lot of variables you have to consider before you can say "this engine can make this much power, that engine can make that much, blah blah"
Can't just consider MSBC, and octane. What about ignition timing, humidity, temperature, etc., etc.
Can't just consider MSBC, and octane. What about ignition timing, humidity, temperature, etc., etc.
12-02-2002, 10:16 AM
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Re: Mean Specific Brake Consumption (Arturbo)
And how do you come up with these #'s? Just curious. 
12-02-2002, 06:04 PM
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Re: Mean Specific Brake Consumption (b_edson)
Am I missing the point? Of course you will have to "up" your octane at a certain power level, but yes engine management does come into play.
For example: what if I had a turbocharged H23 with a 12:1 FMU on stock injectors running 8psi, now because an FMU raises fuel pressure to add extra fuel, the spray pattern of the injectors is less spread out, which means less atomization and possibly creating "hotspots" which could lead to detonation.
But with the "correct" size fuel injectors, and an engine management system that changes the pulse width of the injector, you would have a more accurate air/fuel ratio, not to mention better atomization and MORE POWER per psi!
Regardless of detonation, however, octane will not keep you from breaking rods, or reaching the structural limits of your engine. Unless you burn a valve because of detonation due to lack of octane, then that will keep you from breaking rods,... because you would have burnt valves instead
For example: what if I had a turbocharged H23 with a 12:1 FMU on stock injectors running 8psi, now because an FMU raises fuel pressure to add extra fuel, the spray pattern of the injectors is less spread out, which means less atomization and possibly creating "hotspots" which could lead to detonation.
But with the "correct" size fuel injectors, and an engine management system that changes the pulse width of the injector, you would have a more accurate air/fuel ratio, not to mention better atomization and MORE POWER per psi!
Regardless of detonation, however, octane will not keep you from breaking rods, or reaching the structural limits of your engine. Unless you burn a valve because of detonation due to lack of octane, then that will keep you from breaking rods,... because you would have burnt valves instead
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