This post is in contention of the second-last post in the 'rev-limiter' thread.
Firstly, somebody needs to know the definition of 'side effect.' "A secondary and usually adverse effect - called also side reaction"
If an action causes and undesirable reaction, this is called a side effect.
Secondly, pressurized air is omni-directional. Backpressure creates pressure. Period. Backpressure limits power by increasing pumping forces, and backing spent exhaust gases into the combustion chamber - where it comtaminates the fresh air/fuel charge. And backpressure also causes heat buildup. If you want to go out and create this so-called 'forward pressure,' then by all means, put a straw through a potato, then shove the patato in your tailpipe. Then we'll see how much this 'forward pressure' increases your horsepower. If some backpressure is good, more must be better right?
Thirdly, a manufacturer engineers a redline into a an automobile to set a safe operating limit of its engine. If Mazda engineers decided that the safe operating range of my engine was to 7000RPM, then it will run at 7000RPM all day long with no ill effect. The engine can easily run at 8000RPM in short bursts, or maybe even longer periods, and my car has spend countless days at the dragstrip bouncing off the rev limiter at 7300RPM, doing dozens of dyno pulls up to 7400RPM, and a full year of bouncing off the rev limiter doing autocross. You can bet your ass there has been no ill effects.
Fourthly, an engine's relationship to square has nothing to do with its ability to rev. It's all about its relationship between it's stroke and connecting rods. With a low rod ratio, there are higher accelerative forces, which are what break rods at higher RPM. An engine can have an 80mm stroke, 50mm bore, and have 300mm rods, and it could rev to 10,000RPM without any problems. An engine could also have an 80mm stroke, 110mm bore, and 90mm rods, and it would throw a rod at 5000RPM because of it's low rod ratio, and heavy piston.
Fifthly, the Merriam-Webster definition to redline is "a recommended safetly limit: the fastest, farthest, or highest point or degree considered safe."
NOT(and I quote word for word), "is the point at witch rour engine will not rev any higher. Usually you wil not have a properly funtioning engine when you reach that point. The little red line on your tachometer is just a way of saying your engine is about ready to give tou the ass ******* of a lifetime."
I have, will and do on many occasions, rev my engine PAST redline. I've spent a minute or so bouncing off the rev limiter in one of my carwash bays because I liked the sound.
Sixthly, and I hate to break it to you, there are plenty of high revving Honda engines that are....gasp...undersquare. The legendary Integra Type R B18C5 has an 81mm bore and 87.2mm stroke...yet strangely, it revs easily to 8000RPM.
What else you got?
Firstly, somebody needs to know the definition of 'side effect.' "A secondary and usually adverse effect - called also side reaction"
If an action causes and undesirable reaction, this is called a side effect.
Secondly, pressurized air is omni-directional. Backpressure creates pressure. Period. Backpressure limits power by increasing pumping forces, and backing spent exhaust gases into the combustion chamber - where it comtaminates the fresh air/fuel charge. And backpressure also causes heat buildup. If you want to go out and create this so-called 'forward pressure,' then by all means, put a straw through a potato, then shove the patato in your tailpipe. Then we'll see how much this 'forward pressure' increases your horsepower. If some backpressure is good, more must be better right?
Thirdly, a manufacturer engineers a redline into a an automobile to set a safe operating limit of its engine. If Mazda engineers decided that the safe operating range of my engine was to 7000RPM, then it will run at 7000RPM all day long with no ill effect. The engine can easily run at 8000RPM in short bursts, or maybe even longer periods, and my car has spend countless days at the dragstrip bouncing off the rev limiter at 7300RPM, doing dozens of dyno pulls up to 7400RPM, and a full year of bouncing off the rev limiter doing autocross. You can bet your ass there has been no ill effects.
Fourthly, an engine's relationship to square has nothing to do with its ability to rev. It's all about its relationship between it's stroke and connecting rods. With a low rod ratio, there are higher accelerative forces, which are what break rods at higher RPM. An engine can have an 80mm stroke, 50mm bore, and have 300mm rods, and it could rev to 10,000RPM without any problems. An engine could also have an 80mm stroke, 110mm bore, and 90mm rods, and it would throw a rod at 5000RPM because of it's low rod ratio, and heavy piston.
Fifthly, the Merriam-Webster definition to redline is "a recommended safetly limit: the fastest, farthest, or highest point or degree considered safe."
NOT(and I quote word for word), "is the point at witch rour engine will not rev any higher. Usually you wil not have a properly funtioning engine when you reach that point. The little red line on your tachometer is just a way of saying your engine is about ready to give tou the ass ******* of a lifetime."
I have, will and do on many occasions, rev my engine PAST redline. I've spent a minute or so bouncing off the rev limiter in one of my carwash bays because I liked the sound.
Sixthly, and I hate to break it to you, there are plenty of high revving Honda engines that are....gasp...undersquare. The legendary Integra Type R B18C5 has an 81mm bore and 87.2mm stroke...yet strangely, it revs easily to 8000RPM.
What else you got?
Last edited:
