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 Peerless 700 durability/limitations questions

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Backroadbomber
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PostSubject: Peerless 700 durability/limitations questions   Thu Jan 07, 2016 4:43 am

Hi everyone. I already have a build thread going on this project, so mods if this isn't allowed please move/delete. But my question pertains to the trans I'd like to use.
Long story short, I bought a golf cart that's electric, and want to repower it. I'm planning on using a 15hp verticle Briggs and a peerless 700 transmission. I plan on hooking the Briggs up just like a lawn tractor, with a belt and a clutch pulley, and then running a chain from the peerless to the input of the rear differential. My goal is to hit 30mph in top gear. I know it would probably be pertinent to know what my final gear ratio is, however it's 4am so I'll check after work. Anyways, I've come to the conclusion that with 20" tires and a 6:1 diff ratio, I'd have to spin the input 3000rpm to achieve that speed. Now I know about the whole "race prep" thing, and I'm already planning on filling the gearbox with oil, supporting the input shaft, and installing a breather, but my first main question is, will the trans even hold up to it? The golf cart as a rolling chassis only weighs about 150lbs, so loaded down with a drivetrain and two fat guys I'm sure it'll be under 1000. Next question is, everything I found online says the gearbox is only rated for 2400rpm, but it seems the general consensus is that overdriving is OK because it's torque that kills them. So I guess my question would be, how much overdrive is OK? Like, 1:1 so it spins the input at 3600rpm? Tha would be great, because assuming I have a 3:1 final ratio, I could run a 1:3 from the trans to the axle and call it a day. Btw I should mention that removing the reverse chain is not an option... That's the whole point of using the transmission is to gain reverse. A manual shift golf cart is just a bonus. My last question would be, if the peerless 700 is too weak for my application, then what would be a good cheaply-sourced option? Preferably from an easily found piece of outdoor equipment. Thanks
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Stretch44875
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PostSubject: Re: Peerless 700 durability/limitations questions   Thu Jan 07, 2016 7:27 am

3000 rpm, you would have to overdrive the 700 insane high, I'm guessing 10,000rpm plus.
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Backroadbomber
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PostSubject: Re: Peerless 700 durability/limitations questions   Thu Jan 07, 2016 12:54 pm

Well I was thinking going 1:1 from pulley to trans, which would be 1200rpm output speed because hi gear is 3:1. Then running a chain from a 5" sprocket to a 2" sprocket on the rear diff, spinning the diff input at around 3000 rpm. The diff at 6:1 would then spin the axles at 500 rpm, giving me 30mph with my 20" tires. I'm just unsure if the little 700 could handle it. But I was I was looking at comet clutch reverse gearboxes today, and From the looks of the internals I'm pretty sure the 700 is stronger. I'd just like some re-assurance and/or horror stories before I start this whole project.
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1997 Murray
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PostSubject: Re: Peerless 700 durability/limitations questions   Thu Jan 07, 2016 9:54 pm

Where do you get a 6:1 diff ratio? could you just use a straight axle and then you won't have to put the stress of a 5" sprocket on the 700? I think that would be better than using the stock electric golf cart diff anyways.
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Stretch44875
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PostSubject: Re: Peerless 700 durability/limitations questions   Fri Jan 08, 2016 7:20 am

Golf cart axles are pretty heavy duty, and have nice brakes.  Sprocket idea would work.  Not sure on durability, imagine it would work for a while.  I'd try to squeeze a small stick shift automobilne transmission in.
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PostSubject: Re: Peerless 700 durability/limitations questions   Fri Jan 08, 2016 5:32 pm

Yeah it's got independent rear suspension with dual disc brakes and a differential. Putting a solid rear axle on it would be a waste of time and a lot of money. The more I think about it, the more I think the 700's not going to be good enough to handle it. I'll have to figure something out. It would cost around $1000 to buy batteries and a charger so if I can do it cheaper with tractor or automotive sourced parts then I can justify it. When I figure something out I'll update my build thread in the off topic section.
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Backroadbomber
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PostSubject: Re: Peerless 700 durability/limitations questions   Fri Jan 08, 2016 5:35 pm

And I get the 6:1 diff ratio from the fact that when you turn the differential input 6 times, the tires spin once.
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rarbaugh07
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PostSubject: Re: Peerless 700 durability/limitations questions   Fri Jan 08, 2016 7:15 pm

I would use a small car 3 speed manual trans and mount a horizontal shaft engine with a belt clutch to the input of the trans.
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mr.modified
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PostSubject: Re: Peerless 700 durability/limitations questions   Sat Jan 09, 2016 6:30 pm

Stretch44875 wrote:
3000 rpm, you would have to overdrive the 700 insane high, I'm guessing 10,000rpm plus.  

Isn't he just saying turn the input of the trans at 3000?

I think they look kinda on the light duty side myself. Especially for anything with some weight. I guess some guys use them for circle track racing.
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