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Checking/adjusting engine RPM?


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#1 alsjunk OFFLINE  

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Posted February 05, 2012 - 02:22 PM

What do you guys use to check a small engines RPM? Thanks for any info.

#2 olcowhand OFFLINE  

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Posted February 05, 2012 - 03:38 PM

I used to use a "Vibra-Tach"

tec_670156.jpeg

But now I use a photo digital tachometer. VERY accurate! Just put a small piece of reflective tape on the crank, or anything that rotates with the crank, then point the tach at it, push button....and exact rpm's come up.

China_DT6234B_Photo_Tachometer_with_CE_and_ROHS_certificate201012221345246.jpg
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#3 mikebramel OFFLINE  

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Posted February 05, 2012 - 11:28 PM

Agree, photo tach is the most universal way of doing it

#4 IamSherwood OFFLINE  

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Posted February 06, 2012 - 08:19 AM

I'm guessing you did some researching before you bought that digital tach Olcowhand.
Have you got anymore details about it? Make, model?

I have one of those vibratachs, but find it a bit too much of a ordeal to get an accurate reading.

Thanks

#5 KennyP ONLINE  

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Posted February 06, 2012 - 08:36 AM

Will, it looks real close to this one:
Photo Tachometer DT2234A (Laser)--shore durometer|coating thickness gauge|Graigar Instruments Co.,Ltd.

#6 olcowhand OFFLINE  

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Posted February 06, 2012 - 09:59 AM

I'm guessing you did some researching before you bought that digital tach Olcowhand.
Have you got anymore details about it? Make, model?



Thanks


It's up at Meangreen's right now, but I'll get the make later. I paid around $2 for it, shipping & all! One of those online shopping places (can't remember which) sent me a coupon code for $15 off any purchase, and this the tach had free shipping. So ended up around $2. No-brainer to buy it!
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#7 TerryD OFFLINE  

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Posted February 06, 2012 - 10:23 AM

I have one of the digital tachs as well. Just apply a piece of reflective tape (included with mine, and I'm sure most) attached to the driveshaft, point and click. I like that I can move it from machine to machine without unwiring and rewiring.

http://www.amazon.co...s00_i00_details
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#8 brokenbudget OFFLINE  

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Posted February 06, 2012 - 06:39 PM

a silver sharpy marker works just as good if the shiny sticker doesn't want to stick:give_me_beer:
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#9 Billygoat OFFLINE  

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Posted February 06, 2012 - 08:40 PM

brokenbudget is right about the silver Sharpie- it works like a champ against a dark background. I have one like TerryD shows. Got it off of Ebay, paid about $15.
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#10 KennyP ONLINE  

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Posted February 07, 2012 - 07:57 AM

For the reflective tape, if you happen to have any of the foil tape for heating/air ducts, that would work. I also have the silver pencil for marking metal for cuts, got it when I was picking up welding supplies.
MarkingPencil.jpg

Edited by KennyP, February 07, 2012 - 08:03 AM.


#11 GTTinkerer OFFLINE  

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Posted February 07, 2012 - 09:01 AM

The prices have really dropped since I bought my digital tach back in 2001 for $150 which was cheap back then. But then again it is over 10 years old and still works great. It also has the adapters for measuring belt speed.

Bill

#12 alsjunk OFFLINE  

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Posted February 10, 2012 - 08:11 AM

Thanks to all! I have one on the way.

#13 cookiemonster OFFLINE  

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Posted February 10, 2012 - 12:55 PM

I second, third, fourth that motion on the photo/reflective.
just make sure that you affix the reflective tape on a dull surface. Or use something like electrical tape all the way around and then put the reflective block on top. If you're measuring off a shiny surface it'll jump around wildly on you. If you see that, stop and make sure that your tape is the only shiny spot it's "seeing"




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