Author Topic: john deere build  (Read 1493 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

Offline Fast108Deere

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Re: john deere build
« Reply #6 on: January 18, 2018, 05:24:45 PM »
Thanks for the help coming in on the gearing still not really sure on which way to go for starting point.
And would the 5" pulley on motor and gear box be to much for it being 1:1 to the gearbox as far as gearbox rpm.
And as far as the rear sprockets if it makes it easier or any difference I can get diff rear sprockets those  are just some I have.
Thanks!!


Offline Fast108Deere

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Re: john deere build
« Reply #7 on: January 18, 2018, 05:39:04 PM »
here is some pics. still don't know how to post them on here.

here it is when I got it. (had just an 8hp briggs)
https://screenshot.net/5qdylbo

mocking up the new v twin engine
https://screenshot.net/6zxylh4

stripped and mock up of new wheels and tires
https://screenshot.net/8g0w7a6

front and rear axle on
https://screenshot.net/82pk3t8

making exhaust (has side exit on both sides)
https://screenshot.net/wglp1aw

test fitting fuel tank
https://screenshot.net/kxrgysm

how it sits with fenders and hood sitting on it
https://screenshot.net/1x7ops7
https://screenshot.net/q2nkgtz

some of the goodies for the motor
https://screenshot.net/9nmg0t4


just some pics, will get some more up of the frame and what not soon

Offline Mower Maniac

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Re: john deere build
« Reply #8 on: January 18, 2018, 09:23:29 PM »
Its not too much for the gearbox to handle... Looks good. Its a shame that you aren't going to race it competitively...
AZLMRA
2016-GPK 3rd place
2017-GPK 2nd place

Offline PJG56

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Re: john deere build
« Reply #9 on: January 19, 2018, 06:59:36 AM »
It will be much easier to gear and have more torque if gearbox ratio is less than 1to1
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)

 

anything