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Old 08-23-2003, 03:12 AM
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Smile Lawn mower racing

My psychiatrist suggested that I should limit my racing to this type.I don't know much information and won't be competetive stock.I think he wants me in stock anyway but no way!!LOL! Tell me how to make my sears Cammando 15/2,fly. What mods are available and where can I purchase them for knowledgable racers? Sincerly Jay

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Old 08-23-2003, 08:00 AM
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I don't know much about Racing a lawn mower but it takes me about 1 1/2 hours to cut my grass ! Your are welcome to come here and see if you can cut it any faster! Should be ready to cut again in a week or so. $ 50 bucks says you can't beat me!!
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Old 08-23-2003, 08:08 AM
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You could go overboard on this type of racing too.
Depending on your engine you could do a lot there, most racers prefer a Tecumseh engine stock then move up to Kohler K-series.
Nitrous Oxide Systems (last I remembered) would make a system for anything with internal combustion, BUT you shouldn't need that, as nitrous is a temporary use method anyway.
The first and cheapest speed modification is replace your transaxle pulley with a smaller one, the smaller the pulley the faster you go.
Off the line will now suck but you can now go some legal posted speed limits (10-25 with this mod).
My MTD 12/36 would go 7mph stock, and the axle input pulley measured 8 inches across. I used this tractor for mud bogging races until I BLEW the rear axle.
Next you could get a real good friend at a full service garden tractor dealer (John Deere, Cub Cadet, New Holland, Wheel Horse, and the like).
Locking up the differential may either help or hinder you, most racing sanctions don't allow this.
Replace the internal transaxle gears for more desireable gearing, remembering that before you start to do this you are dealing with axle ratios in the near 40:1 range at 5 miles per hour.
My Lawn Chief tops out at 3mph in 4th gear but will pull a mountain.
The US lawn mower racing association could get you started. www.letsmow.com
Try google and search for "lawn mower racing"
My boss uses his Gravely tractors for tractor pulling machines, and his kids pull for him to get into different weight classes- and his machines are the best pulling gravely tractors in the Northwest Pennsylvania area.
Did anyone else see the Monster Garage episode with Mustang converted to a high speed lawn mowing machine?
HAVE FUN WITH THIS

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Old 08-23-2003, 11:15 AM
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That was one bad-***** lawn mower. A friend of mine knows a guy who burnt up his riding mower engine, so he adapted a VW motor to it.
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Old 08-23-2003, 08:16 PM
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mower blew up yesterday

My wife was making a lap around the yard when it blew. White smoke and no noise nothing, still turns over but dosn't fire up.



Todd



Rat Rods Rule!
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Old 08-23-2003, 08:27 PM
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I just gotta ask " why do U have a shrink?' (Not that there's anything wrong with that) And Why are U limited to lawnmower racing?

Less dangerous? I think not!! Have U ever seem a 600hp 48" cut runaway lawnmower hit a crowd of spectators??

Let me tell U buddy, it's enough ground beef to supply Micky Dee's for a month!!!
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Old 08-23-2003, 11:31 PM
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M & M is on top of it!! (I would go Briggs motor) Also remove the govener! Port and polish the intake and exhaust, Have the cam reground and take .030 off the head. Now a 10hp motor will bring on 20-25hp.
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Old 08-24-2003, 12:01 AM
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Man, this one's a tuffy... I've never hopped up a mower. Here's a link wher you might find the perfect crate motor for that go fast mower.

http://www.briggsracing.com/
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Old 08-24-2003, 01:20 PM
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We have a new John Deer 595 it goes 8.5-9mph stock, its a 24 hp deisel, 22 or 24 hp i think its 24 though.
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Old 08-25-2003, 12:09 AM
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New here and the first thing I see is something I've done (sorta).
Never actually raced but I did get a 3.5hp toro lawnmower to 42mph.
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Old 08-25-2003, 01:53 PM
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Just mount a reel mower to the front of anything!
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Old 08-25-2003, 04:22 PM
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Does the mustang lawnmower they made on Monster Garage count as one? That was one fasy lawnmower if it does.
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Old 12-09-2003, 10:12 PM
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fast lawn mower

its not to hard to make a lawn mower go fast the hard part is getting it to stay together i know a lil about it im a member and a racer of the louisiana lawn mower racing asoc. the most comon used engine is the 18 hp b&s twin cylinder flathead thats what i run but you can use any moter you like most mowers are lowered mine are 4" off the ground and 40" wide duel exaust alm.intake punched out jet in carb timeing turned 1/4 key off on flywheel govner removed 104 oct. race fuel peerless 820 transaxle inverted to run a single belt 7" pully on moter 4" on transaxle transaxle modified with solid axle for pos. trac this should get you in the fifty to 60 mph range word to the wise i speek from exp. you must build a good front end you do not know how much slack is in the steering of a lawn mower till you drive it fifty mph by then its to late
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Old 09-09-2005, 07:17 PM
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how?

hey how do u remove the governor? i have a briggs year 1985 or sum where in that area
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Old 09-09-2005, 08:24 PM
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goverenor removal: I did this on a 6.5hp OHV gocart at my uncle's house...
take some metal wire and loop it through a hole in the throttle on top of the carb. Tie some string to that and place the other end where you can pull it. Make sure when you pull the string it kicks the throttle in, since the govorner will limit engine speed to 3600rpm or so. Removing the air filter helps with response too.

If you search or google enough you can find tips on porting small engines and stuff, they say briggs tends to have too big exhaust port so just clean up the casting flaws. Intake, cleaning some parts helps a lot but grinding other parts hurts, it's all physics.

Removing the muffler is a given, if you look in my photo gallery my 8hp briggs has a pipe and at the end a muffler used to bolt on, if it's straightpiped off the head you'll burn the exhaust valve.

if it's a flathead setup, port the head a bit for valve clearance and some to aid airflow around and down into the cylinder, porting away from the cylinder making more room for airflow does not help.

On the top of my 8hp on the block there's small "ramps", I think grinding these out and making a small radius into the cylinder may help but I didn't want to get shavings into the cylinder bore so I left that alone.

If you want your doc to crap his pants, build something like this.
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