Author Topic: john deere build  (Read 297 times)

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Offline Fast108Deere

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john deere build
« on: January 08, 2018, 09:37:28 PM »
new to the forum but have looking around on here for awhile now so I thought why not join the crew. I'm also new to the mower building scene.
I am starting from what was a working john deere 108. so for the build consist of E.C. front axle kit and their aluminum belt clutch, 1 1/4 axle with racing go kart disc brake,
peerless 1:1 ragb, briggs 44, douglas aluminum wheels, rear tires are 16/7.5/8 and fronts are 13/5/6. this is something that I'm not actually going to race just building for fun.
but I need a little help/ guidance.

for the motor: its a briggs 44 .020 over
arc rods, arc flywheel, new heads with a little work, dual valve springs keepers and retainers with inner springs removed, precisions 3030 cam (I guess its like the little brother to the cheetah cam),
precisions vortex carburetor for a twin. E.C. aluminum carburetor filter adapter kit and filter.

one of the biggest things I need help with is gearing as I just don't really get it.
so it is going to be pulley on engine to pulley on ragb, sprocket out of ragb to rear sprocket. chain for the rear is #40 I have 44,46,48 tooth rear sprockets from E.C. already don't know if any of them will work.

THANKS!!



Offline Fast108Deere

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Re: john deere build
« Reply #1 on: January 08, 2018, 11:01:38 PM »
I have some pics I will get up. but honestly I not really sure how to. lol

Offline Mower Maniac

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Re: john deere build
« Reply #2 on: January 10, 2018, 07:17:18 PM »
What speeds do you want to hit?
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place


Offline Fast108Deere

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Re: john deere build
« Reply #3 on: January 10, 2018, 09:24:38 PM »
not really sure on how possible it would be but somewhere in the neighbor hood of 50-60. just kind of throwing some numbers out there.

pics our coming still just aint had time to figure it out yet, since photobucket don't really work anymore.

Offline PJG56

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Re: john deere build
« Reply #4 on: January 11, 2018, 08:49:01 AM »
not really sure on how possible it would be but somewhere in the neighbor hood of 50-60. just kind of throwing some numbers out there.

I think the 60mph is a long shot,but with some simple math using what you have for parts here are a few gearing combination for you  assuming a 49" roll out on rear tires(they could be a little more or less) and 6000rpm @ motor with 6"pulley on motor and 9"pulley on gearbox.(ratio @ear box is .6666 to 1) motor rpm 6000 x.6666= 4000rpm@ear box

gear box 12 tooth sprocket -rear axle 48 teeth final ratio =6 to 1 MPH=46.4 (axle rpm=1000)
"                                     " -rear axle 46 teeth final ratio=5.75 to 1 MPH=48.4 (axle rpm=1043)
"                                     "- rear axle 44 teeth final ratio=5,50 to 1 MPH=49.59 (axle rpm=1091)

Hope this helps you.. Sincerely Paul Guptill
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
2013 ARMA national champion Mod-X(builder/owner)
2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)

Offline Mower Maniac

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Re: john deere build
« Reply #5 on: January 14, 2018, 10:41:56 AM »
55 would probably be the happy medium between top speed and acceleration. You could end up at about 56 with a 5 to 5 on the bottom. A 10 tooth on the gearbox and the 48 in the rear. Using as lightweight components on the drivetrain will help with acceleration.
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place

 

anything