Those who really understand, can explain it simply, the awesome mr.Cameron 👍 Anyway, that last bit is why i looove to ride after rain, feels like supercharged by nature.
I almost died on my way to Mammoth in 1999 in my TT supra ... in a passing zone, no visible cars in opposing traffic and a guy who'd been in front of me going 70 in a 75 (a sin). I waited until it was both legal and safe (not something i'm known for) ... began passing, and my 70-in-a-75 suddenly felt competitive. It's not that he wanted to drive quickly, he just didn't want anyone else getting anywhere faster than he. My car was modded, bla bla, making about 475 lb ft at the wheels ... at SEA level ... but this was en route to mammoth on a warm day. Of which I'd arrived at sitting behind people for a while, so I was unaware of the changes in performance. When I tried to pass him he accelerated, and suddenly we're absolutely parallel, going 85-90 ... when the invisible ROLLING height of the road revealed traffic that was (at the current rate of closure) a maximum of 1.5s till collision. Anyone who knows cars, time, and reality well, knows that the first 1/3rd of a second is burnt up thinking of what to do ... which absolutely EXCLUDED completing the pass, braking, or fitting 3-abreast. No, all of those decisions were literally likely to be fatal. I was lined up with what I believe to be a Ford F-350 ........ preceding a string of cars. All I could hope for was that they wouldn't react too ... because the only thing left was going into on-coming traffic's shoulder,, hoping no one else had been in said rough lane, and, no one in that string of cars would do the (intelligent) thing of avoiding the car that was scheduled to have a collision (which imo, couldn't have included only 2 cars ... but absolutely several of those behind the first truck, as well). Wow was that lucky .... and all bc I think my TT supra's boost controller (aftermarket) didn't use a mass air sensor but boost pressure maybe..? (I've yet to research it). But from then on I was biased against turbos for the next 20 years later. It truly felt like I lost about 35% of my power. I also ran yokohama A032 tires (forced me to keep 17" wheels) which had the highest grip I could find in any tire at that time. While it only had 8 x 32nds of an inch (how DOT measures it, I realize it's 1/4") so it wasn't ideal for standing water, but on merely wet days, the yokohama got better traction than the pilots it came with got dry. And in order to change lanes to where I thought the truck would only take off my mirror maybe (or maybe hit the right-hand half of the car) I'd made the fastest lane change I'd ever made (and was amazed I didn't lose control). I already had experience on tracks. this was just one of those things that to this day can make my heart skip a beat to think about. A thug pointing a gun was nothing compared to this. I'm not someone who tailgates just to sit there. If I need to change lanes and the gap is small, I'll get near someone's bumper shortly, but sitting there is stupid. Anyway, on my way back from mammoth (in an attempt to change lanes on the freeway) I'd gotten near someone's bumper ... and just before I could change lanes (to a preferred lane) the car in front of me did a last-second emergency lane change ... bc a fcuking rot-iron sofa (lawn furniture???) was on the freeway! lol. With perhaps half the time of the car in front of me (who'd occluded my vision and as a result of changing lanes and my closing rate forced my plans to change to begin with) required I shoulder check before changing to the left instead of the right as I'd initially planned, which felt like I had double the time of the first incident on my way up. After completing it (and feeling bewildered by the odds of two insanely dangerous events which both occurred within weeks of each other which'd yet ever been demanded of me in my previous 9 years of driving combined, just how statistics are) ... I looked around to see if anyone saw what I'd just (again) survived ... and saw a wide-eyed girl (mid-twenties) with her hands covering her mouth ... who, upon seeing me seeing her, shook her head to share in my moment of bewilderment until raising her eyebrows, and giving a thumbs up at my response to something that would've definitely mangled my vehicle (though I doubt it'd do anything more than property damage as it couldn't be more than 100 lbs or so). One crazy trip. Even before that incident the cops in Adelante pulled me over, let me go (bc I was going the speed limit, having already been warned about them) only to pull me over again to _REMIND ME_ to drive "respectably" through their town. lol.
I just got a bike in to work on with a no start condition, it's a 1981 Honda CB 900 F engine in a home-built trike, Much to my surprise it has fuel injection, also is running a Power Arc IDK Crank Trigger. I have no idea where to start, considering the Honda 900F in those years was carbureted, and the original builder has passed away, I do not have a clue where to begin, I know Power Arc did make an ignition system to fit the 900, but when you look on the website, it says it's obsolete. Any suggestions? The trike is an immaculate showpiece, but I don't know where to look, because as, you stated the injection system needs a crank trigger, and I doubt I can replace it with a Dyna 2000 (Only Replacement I can find) built for that bike, as it will not have the provision for triggering the injectors
The oxygen sensors on motorcycles, are they used to adjust the injector on time like they do on cars? In my automotive world it's called fuel trim. The computer can either add or subtract fuel, from the map, based on how rich or lean the exhaust stream is via the o2 sensors.
I have been experimenting with a 2020 Honda CRF250 Rally, which seems strangled by the airbox due to noise emissions regs. I’ve gradually opened the airbox up and ultimately took off the airbox lid. The fuel injection appears to be closed loop and compensating well, I saw a 16.8% improvement at 3-6000rpm and 10% improvements at 5-1000rpm. I tested it against the stopwatch, top gear and 3rd gear 30-60mph. My question is, how far can I go, does Honda have preset parameters that the PGM-FI won’t go beyond? My thoughts are that the difference it needs to compensate for between sea level in Alaska in the winter and the mountains of Colarado must be more than the additional airflow I’m giving it. What are the facts as I’m struggling to find out? Thanks. Gordon
I guess its both - "alpha-n" and "speed density" systems. They're used depending on many variables. Speed density is used for lower rpm's and idle, alpha-n is used for higher rpm's (since mass of air on higher speeds won't change at all).
Gotta love this guy. So knowledgeable but is able to put his ideas across so succinctly. Keep them coming Kevin.
Kevin K is simply the best. Thanks!
holy crap, kevin cameron...takes me back to the days of cycleworld back in the 1990'ss good stuck
The best basic instructional videos presented by the dean of mechanical instruction. Subscribed.
Awesome video Kevin!
Thanks Kevin, your videos are great and your explainations even better. Thank you for sharing your knowledge.
Another excellent video, Kevin but I believe the title should have been “fuel injector system”, not just “fuel injector”.
Underrated vid
Nice characterization of the client/server relationship between rider and throttle by wire control system!
Those who really understand, can explain it simply, the awesome mr.Cameron 👍
Anyway, that last bit is why i looove to ride after rain, feels like supercharged by nature.
I almost died on my way to Mammoth in 1999 in my TT supra ... in a passing zone, no visible cars in opposing traffic and a guy who'd been in front of me going 70 in a 75 (a sin). I waited until it was both legal and safe (not something i'm known for) ... began passing, and my 70-in-a-75 suddenly felt competitive. It's not that he wanted to drive quickly, he just didn't want anyone else getting anywhere faster than he. My car was modded, bla bla, making about 475 lb ft at the wheels ... at SEA level ... but this was en route to mammoth on a warm day. Of which I'd arrived at sitting behind people for a while, so I was unaware of the changes in performance. When I tried to pass him he accelerated, and suddenly we're absolutely parallel, going 85-90 ... when the invisible ROLLING height of the road revealed traffic that was (at the current rate of closure) a maximum of 1.5s till collision. Anyone who knows cars, time, and reality well, knows that the first 1/3rd of a second is burnt up thinking of what to do ... which absolutely EXCLUDED completing the pass, braking, or fitting 3-abreast. No, all of those decisions were literally likely to be fatal. I was lined up with what I believe to be a Ford F-350 ........ preceding a string of cars. All I could hope for was that they wouldn't react too ... because the only thing left was going into on-coming traffic's shoulder,, hoping no one else had been in said rough lane, and, no one in that string of cars would do the (intelligent) thing of avoiding the car that was scheduled to have a collision (which imo, couldn't have included only 2 cars ... but absolutely several of those behind the first truck, as well). Wow was that lucky .... and all bc I think my TT supra's boost controller (aftermarket) didn't use a mass air sensor but boost pressure maybe..? (I've yet to research it). But from then on I was biased against turbos for the next 20 years later. It truly felt like I lost about 35% of my power. I also ran yokohama A032 tires (forced me to keep 17" wheels) which had the highest grip I could find in any tire at that time. While it only had 8 x 32nds of an inch (how DOT measures it, I realize it's 1/4") so it wasn't ideal for standing water, but on merely wet days, the yokohama got better traction than the pilots it came with got dry. And in order to change lanes to where I thought the truck would only take off my mirror maybe (or maybe hit the right-hand half of the car) I'd made the fastest lane change I'd ever made (and was amazed I didn't lose control). I already had experience on tracks. this was just one of those things that to this day can make my heart skip a beat to think about. A thug pointing a gun was nothing compared to this.
I'm not someone who tailgates just to sit there. If I need to change lanes and the gap is small, I'll get near someone's bumper shortly, but sitting there is stupid. Anyway, on my way back from mammoth (in an attempt to change lanes on the freeway) I'd gotten near someone's bumper ... and just before I could change lanes (to a preferred lane) the car in front of me did a last-second emergency lane change ... bc a fcuking rot-iron sofa (lawn furniture???) was on the freeway! lol. With perhaps half the time of the car in front of me (who'd occluded my vision and as a result of changing lanes and my closing rate forced my plans to change to begin with) required I shoulder check before changing to the left instead of the right as I'd initially planned, which felt like I had double the time of the first incident on my way up. After completing it (and feeling bewildered by the odds of two insanely dangerous events which both occurred within weeks of each other which'd yet ever been demanded of me in my previous 9 years of driving combined, just how statistics are) ... I looked around to see if anyone saw what I'd just (again) survived ... and saw a wide-eyed girl (mid-twenties) with her hands covering her mouth ... who, upon seeing me seeing her, shook her head to share in my moment of bewilderment until raising her eyebrows, and giving a thumbs up at my response to something that would've definitely mangled my vehicle (though I doubt it'd do anything more than property damage as it couldn't be more than 100 lbs or so). One crazy trip. Even before that incident the cops in Adelante pulled me over, let me go (bc I was going the speed limit, having already been warned about them) only to pull me over again to _REMIND ME_ to drive "respectably" through their town. lol.
In a 4 stroke engine we have one combustion per 2 rotation of crankshaft how does the ecu knows when is the intake and injects fuel?
I just got a bike in to work on with a no start condition, it's a 1981 Honda CB 900 F engine in a home-built trike, Much to my surprise it has fuel injection, also is running a Power Arc IDK Crank Trigger. I have no idea where to start, considering the Honda 900F in those years was carbureted, and the original builder has passed away, I do not have a clue where to begin, I know Power Arc did make an ignition system to fit the 900, but when you look on the website, it says it's obsolete. Any suggestions? The trike is an immaculate showpiece, but I don't know where to look, because as, you stated the injection system needs a crank trigger, and I doubt I can replace it with a Dyna 2000 (Only Replacement I can find) built for that bike, as it will not have the provision for triggering the injectors
Many Thanks again Kevin! I'm always looking forward to your vids.
Digital is getting better all the time. Carbs had over 100 years headstart in development.
Are you talking abut manifold or direct injection ?
This was a good one.
The oxygen sensors on motorcycles, are they used to adjust the injector on time like they do on cars? In my automotive world it's called fuel trim. The computer can either add or subtract fuel, from the map, based on how rich or lean the exhaust stream is via the o2 sensors.
OBD2 compliant bikes do.
I would think they are similar. O2 sensors allow for closed-loop operation in both cars and bikes.
I have been experimenting with a 2020 Honda CRF250 Rally, which seems strangled by the airbox due to noise emissions regs. I’ve gradually opened the airbox up and ultimately took off the airbox lid. The fuel injection appears to be closed loop and compensating well, I saw a 16.8% improvement at 3-6000rpm and 10% improvements at 5-1000rpm. I tested it against the stopwatch, top gear and 3rd gear 30-60mph. My question is, how far can I go, does Honda have preset parameters that the PGM-FI won’t go beyond? My thoughts are that the difference it needs to compensate for between sea level in Alaska in the winter and the mountains of Colarado must be more than the additional airflow I’m giving it. What are the facts as I’m struggling to find out? Thanks. Gordon
My 07 cbr600rr has a 2-stage fuel injection.
What is that?
I guess its both - "alpha-n" and "speed density" systems. They're used depending on many variables. Speed density is used for lower rpm's and idle, alpha-n is used for higher rpm's (since mass of air on higher speeds won't change at all).
"oh please oh wise one !!" ...