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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
 Posted - Jul 31 2004 : 7:19:08 PM
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I've cleaned a lawn mower engine out, but whenever I pull the cord it revs and then stops. Is this because I havent attached to blades yet? They are wheighty so they must act as a flywheel.
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Brian
Apprentice
USA
106 Posts |
Posted - Jul 31 2004 : 7:24:13 PM
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Yes - most push lawnmowers use the blades as a flywheel.
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Jul 31 2004 : 7:39:38 PM
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Thank's Brian I proved my dad wrong, he thought it was something ells. 
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 03 2004 : 09:08:08 AM
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That's probably it. Most lawnmower engines have lightweight aluminium flywheels, and actually use the blade instead...But it may also be a vacuum leak between the carb and the engine.
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Aug 04 2004 : 02:03:44 AM
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Yes, I got it running with the blades, then it stoped and didn't start back up again. Vacuum leak from Carb to cylinder was the only thing the caused it; I know. Before I knew this I tried to search for a probblem in the cylinder, when I screwed it back together I axidently cracked the cylinder by over tightening the bolts. Anyway it wasn't like it was a new lawnmower, it had a history of probblems.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 04 2004 : 09:05:39 AM
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Ouch....Someone needs to buy a torque wrench.  The torque on the bolts is actually very low...only about 18 FT-lbs or so. Also, there is a pattern you need to follow.
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Aug 05 2004 : 02:36:07 AM
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Do you mean that I need to follow a pattern to fix a LM engine? If I do, could ya please tell me; and any other advice.
You may have noticed that I have posted a topic in the "Power supply" section, the one with nearly 200 replies titled "My inverter design". Once the inverter is built i'm gonna rig it up to an altenator running off a LM engine. My reson for this paragraph is; will my inverter work of an altenator straight?
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 05 2004 : 1:33:17 PM
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When torquing any flat piece down (ie. cylinder head), you need to follow a specific pattern. Normally it is a criss cross pattern, and there are two or three steps in torque. The service manual for the engine would have this information.
Alternators don't put out a very clean voltage, so you'll need a battery to smooth it out. Also, most alternators are only about 700-1000W.
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Aug 06 2004 : 12:23:10 AM
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Batteries cost alot and I dont want to buy one, so is their any other way to smooth the voltage out. Is it a sine, square, triangle, sawtooth wave; Or is it a distorted wave? I know that Altenators use a Regulator to control the voltage to the battery, depending on it state of charge; so is it easy to take the Reg off to power the inverter.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 06 2004 : 09:12:50 AM
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Batteries are cheap, much cheaper then any other method. You should be able to find a 12-15AH gell cell for about $20 from a local battery supplier. You could buy a large capacitor, but it won't handle the "surge" current and will probably cost 3x as much as a battery.
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Aug 06 2004 : 5:16:31 PM
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$20 hey thats pretty cheap, how long do they normally last; should I keep the regulator on the Alty? So ya think I need 12-15AH battery, will the Alty keep the battery charged when my inverter is at full load? I thinks so because most Altenators can give out a powerfull 80A; should have no probblem charging the battery. Well of course the reg would moderate the charge rate to the battery.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 09 2004 : 10:25:14 AM
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How long they last depends on a lot of things..Depth of discharge, load, temperature, charging curve, etc.
Yes, you should keep the regulator on the alternator...Most alternators are lower then 80A, so you should confirm that yours can put out this current.
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n/a
DELETED (Inactive)
14 Posts |
Posted - Sep 07 2004 : 10:38:39 AM
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whoopsy... that would probably mean the head bolts on the Briggs and Stratton sitting on the back verandah are about 10 times too tight :p lol but they started off being too loose... it used to leak..... lol
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Sep 08 2004 : 02:17:06 AM
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Good for you AmmoJammo. LOL
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Topic |
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Whats wrong with me engine?
