Heilman181
ArboristSite Operative
Has anyone every used one of these?
Tecumseh Tachometer - Small Engine Vibra Tach
Tecumseh Tachometer - Small Engine Vibra Tach
small engine tach
- Thread starter Heilman181
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Lakeside53
Stihl Wrenching
I haven't but there was a thread a month or so back that discussed these and other tachs. I wouldn't trust my saw to one... they really aren't all that accurate.
Lakeside woulden't a tach give you a ballpark figure? Or something close..Other wise I would have to crank her up till she blows and back her down a couple hundred...
wagonwheeler
ArboristSite Guru
Heilman181 said:
I bought the Briggs Vibra Tach (German Made) and I think I started the thread a couple of months ago about it. MSRP is around $19.
It's a cool tach (a novelty of sorts), but the accuracy diminishes w/ RPM increase. The scale gets smaller and smaller. Though I dont' mind using it to check idle speed, (mowers, blowers, saw) I've decided against using it to check WOT - nor would I recommend it.
Chaser
Heilman181
ArboristSite Operative
Thanks! That is the info I was looking for.
Echo Boyboyboy
ArboristSite Lurker
I have verified mine on my model airplane engines (12,000 to 18,000 RPM) against an electronic tach. The measurements with a vibratach were within 2% of the electronic at 12,000rpm (+/-200rpm). Not too bad considering they get better at lower RPM.
AJY
AJY
wagonwheeler
ArboristSite Guru
Echo Boyboyboy said:
I'm not holding a saw w/ b&c at 13,000 rpm no-load (and certainly not in the cut) while trying to manipulate the vibra-tach.
I recommend a method of keeping BOTH hands on the saw as much as possible and my Briggs vibra-tach is not part of that equation.
Running a saw WOT no-load while taking the time to dial-in the tach may not be beneficial for the saw - especially if you determine it's over-reved. A model airplane engine is under load when the prop is turning - and basically under max load when bench run. Less chance of engine or personal injury IMO.
Chaser
Echo Boyboyboy
ArboristSite Lurker
I completely agree that a vibratach for any sort of non-idle measurement on a saw is NOT a good idea. Even for idle I would have someone else hold the saw. It simply takes too long to make a measurement and since I don't have the obligatory 4 arms I'm not going to try it at WOT. 
I'm just saying that in my experience they are deceivingly accurate.
I'm just saying that in my experience they are deceivingly accurate.
wagonwheeler
ArboristSite Guru
Echo Boyboyboy said:I completely agree that a vibratach for any sort of non-idle measurement on a saw is NOT a good idea. Even for idle I would have someone else hold the saw. It simply takes too long to make a measurement and since I don't have the obligatory 4 arms I'm not going to try it at WOT.
I'm just saying that in my experience they are deceivingly accurate.
When mine came in at the shop they had already been playing w/ it some. We tested it against the Stihl digital while I was there so I could get a 'feel' for how it worked. It was right on the money as best we could determine. Especially easy to see on the Exmarks at 3750?
We had 2 people involved checking it on the high end, one w/ both hands on a MS390. While fooling around w/ it the 390 hiccuped coming off WOT and ate the starter dogs and cord...oops!
Chaser
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