Prince, if you are so hell-bent on the opinion that the sirometer is not accurate, perhaps you would care to show up with an example of an engine for which it gives an incorrect result, and demonstrate this inaccuracy by some suitable means. If you can DEMONSTRATE a situation in which it gives an incorrect result then MAYBE someone might listen to you.Here's some help. I do not know how that device operates. A 4-cylinder 4-stroke engine that is exceptionally well counterbalanced and has exceptionally good cylinder-to-cylinder load balance might exhibit a primary vibration frequency twice that of the crankshaft rotation speed (two firings per revolution, and with exceptional mechanical balance and exceptionally good cylinder-to-cylinder balance there are no significant remaining once-per-revolution vibrations remaining). A Gold Wing engine might be another good test case. The flat-six arrangement has very good mechanical balance and gives a very uniform crank rotation speed. But, it doesn't have the twice-per-revolution firing and crank-rotation-speed irregularity that an inline-four has.I have a funny feeling that for the engines that this gizmo is primarily going to be used on (H-D 45-degree V-twins) it will have NO difficulty whatsoever. Those engines have an irregular firing order that repeats at half crank rotation speed but are extremely UNbalanced mechanically, and that is a once-per-revolution unbalance.Remember, though, that the idle-speed noise measurement is not dependent on knowing the RPM. If it's making more than 92 dB with the engine running but nobody touching the throttle, that's enough for a non-compliance right there ... the RPM doesn't matter, so the means by which it is measured doesn't matter.
@Brian, I'll pass on showing up. I know cops, ride with cops, and don't trust cops. How hypocritical it is to see cops blowing past you at three times the speed limit. Riding with them is as close as a "get out of jail" card as I'll ever get to see.
You're absolutely right, these are most likely the engines where this device (if used) will be used. Most of them with straight pipes (guys that think noise = power) will have back-firing, and after-firing as part of running straight pipes. This unit will pick up the vibration of that back (into the intake) fire and after (into the exhaust) firing. What about a high-miler that's all carboned up and pinging? Will the needles of this device not be jumping all over the place with the pings? If it's accurate enough, it should be as pinging is vibration. Does the unit use a probe, or a magnet? How would you use a probe on an unbalanced HD engine that'll shake your fillings lose? Picture trying to hold a pencil up to a paint-shaker! Magnetized? It'll go flying across the ground on said engine. It's a fascinating little device, but IMHO, is not accurate enough to enforce law. It would be the first thing a (good) lawyer would go after. It even states "readings change with location" (on engine). As you stated, and you're totally correct, most straight-pipes won't even pass one of the two criterion, the idle. These are the gross violators that they're after, but they're gonna sink some of the rest of us in sussing out these straight pipes.
@Turbo: If you look for those by-law signs, they are there with respect to traffic violations that are city/town specific (I.E. "Please Do Not Use Engine (Jake) Brakes.") They do require signs as out-of-towners would have no idea the law is in place as it's not Ontario-wide.
If the people of Caledon were smart, they'd take advantage of the motorcycles that flood their town on the weekends. More restaurants designed for the motorcycle crowd, A place to sit along the Forks and have a beer? One or two motorcycle shops? Quick oil change places? And god forbid, perhaps a race track? Somewhere where GTA'ers could go and let loose legally without driving near the US or half way to Ottawa? There are obvious motorcycle enthusiasts that live along the Forks. Why not cash in the crowd that is attracted to your town? The only money that's currently spent is your $29.99 for a small coffee at The Shed. Why would they not embrace and cash in on us to stimulate their local economy?
@Bigman Nice bike, and well said!
@AFJ Just wondering what you do that you're using this device over a normal tach probe?
