Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Tachometer rpm reading accurate on my Toro Tecumseh engine?
Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions |
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coasteray
El Toro! 1028 LXE
Tecumseh 358cc
10hp
Location: NE Washington State
Joined: Mar 3, 2008
Points: 142
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Tachometer rpm reading accurate on my Toro Tecumseh engine?
Original Message Nov 20, 2011 1:10 am |
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I just started using my new hour meter/tachometer today on my blower, and it peaked out at only 3180rpm, but steadily displayed 3120rpm. It is this one: http://www.amazon.com/Tachometer-Kawasaki-Motorcycle-Generator-Snowmobile/dp/B0049IFX56/ref=sr_1_cc_1?s=electronics&ie=UTF8&qid=1321768364&sr=1-1-catcorr Using that horsepower-to-torque formula (HP = torque x rpm, divided by 5252), I get 8.66 HP at 3120rpm. At 3600, it would be 9.993 HP. For the formula I used a torque figure of 14.58, which I got by plugging in the assumed Tecumseh 10.0 HP figure at the assumed rpm of 3600, into the torque-to-horsepower formula (HP x 5252, divided by 3600). Lots of assumptions, I know, but I had to get the torque figure that way so I could turn around the formula to get my horsepower figure at 3120rpm. Anyway, I don't know if this meter is accurate. When my son and I get his Ariens ST824 put back together again (took it apart to paint the inside of the housing; adjust the chains; replace the friction disc, cracked handlebars, and beat-up/bent impeller; serrate the augers using a Platinum 30 cardboard template I made while at Home Depot; greasing the chains, auger shaft, and friction disc shaft), then I will try my tachometer on his machine. I may just pick up another meter to compare in the end. If the reading is the same on his, or close, then maybe it is the meter. If he gets around 3600rpm at full throttle, then maybe I need to adjust my governor. If I do have to adjust it, does anyone know how to do that? It's only a three-year old Tecumseh L-Head 358cc. Thanks for any help.
This message was modified Nov 21, 2011 by coasteray
 El Toro! 1028 LXE - Tecumseh 358cc 10hp Let it snow! Let it snow! Let it snow!
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RedOctobyr
Location: Lowell area, MA
Joined: Nov 5, 2011
Points: 282
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Re: Tachometer rpm reading accurate on my Toro Tecumseh engine?
Reply #40 Nov 22, 2011 9:00 pm |
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On my Tecumseh two cycle engines, I've tied a piece of string to the governor lever arm and run it outside the plastic housing up the handle and rigged it to work like a throttle. I let the machines idle down when not under load then put tension on the string to pull the arm to over-ride the governor. I get some pretty good engine speed and power doing this. The engine is rated at 5 h.p. at 3600 rpm, which I find a bit of a stretch. However, crank it up to 6000 or 6500 and it makes some serious power. Enough to impress me with how much and far it pump snow. I use the old SS machines like a I use a chain saw. No load, no rpm. Heavy load, high rpm. It's actually quite controllable. Wow, 6500 RPM?? The engines hold up OK at that speed? Granted, you're only doing that occasionally. The extra RPM would give you a great boost in impeller/paddle tip speed, which must be a big help. At least with a 2-stroke you shouldn't have to worry about valve float and things like that.
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jrtrebor
Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539
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Re: Tachometer rpm reading accurate on my Toro Tecumseh engine?
Reply #42 Nov 22, 2011 9:33 pm |
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On my Tecumseh two cycle engines, I've tied a piece of string to the governor lever arm and run it outside the plastic housing up the handle and rigged it to work like a throttle. I let the machines idle down when not under load then put tension on the string to pull the arm to over-ride the governor. I get some pretty good engine speed and power doing this. The engine is rated at 5 h.p. at 3600 rpm, which I find a bit of a stretch. However, crank it up to 6000 or 6500 and it makes some serious power. Enough to impress me with how much and far it pump snow. I use the old SS machines like a I use a chain saw. No load, no rpm. Heavy load, high rpm. It's actually quite controllable. I may try that. I have a Toro CR20E and a CCR2000 that I've rehabbed. I usually just tighten up the gov spring and leave it. But I like the idea of being able to slow them back down. A neighbor and I where helping out a friend with their snow last year. And my friend said boy your blower sure throws snow better than mine. He had a CCR2000 and at the time I just had a CCR1000. I just kind of smiled, and told him I could fix his if he wanted.
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blumonster
Location: Wisc.
Joined: Oct 14, 2011
Points: 163
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Re: Tachometer rpm reading accurate on my Toro Tecumseh engine?
Reply #44 Nov 22, 2011 9:38 pm |
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The owner's manual on my ex HS35 states 3.5HP at 1800RPM. The HS35 I had was the very first model prior to the updated CDI HS35, which was used on serial number greater than 104XXX. If my owner's manual is correct with1800 RPM then 2200 RPM is not too far out and within the range. Perhaps this explains why the engine would sound really bad at higher RPM as it is not designed to rev that high. I could see my piston flying out at 6500RPM, which would have been a nice show.
MN_Runner, the shop manual I have is published in 1980 and printed in 1986.The updates are covered in the supplement to the manual.
4000RPM is mentioned in the main part of the shop manual.It is interesting to have two different governed RPM values. My machine too is the older version with frame serial number smaller than 1048...If we believe the owners' manual then everything is OK. (?)
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