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Big Block Talk! Everything about swapping a big block engine into your cart! |
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04-24-2021, 07:57 AM | #1 |
Getting Wild
Join Date: Aug 2018
Posts: 82
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Textron 2 stroke to 670 swap
Well I got invited to some sort of of golf cart race next weekend, and none of my projects were running yet. I am having to rush and put together some sort of budget build so that I could join in the fun.
I had an old rusting ezgo 2 stroke in my backyard, and an old sprint racer chassis. The sprint racer had a live axle and hydraulic brake setup that I wanted to transfer over to the cart. Being that the ezgo's two stroke engine was locked up, and the transaxle had no reverse gear anyways, I figured some sort of chain drive solution would be a quick option. |
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04-24-2021, 08:08 AM | #2 |
Getting Wild
Join Date: Aug 2018
Posts: 82
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Re: Textron 2 stroke to 670 swap
Craigslist 670 vtwin seemed like a fun and quick way to get off the line. The race rules limited top speed to 35mph, so I'm hoping the vtwin's lower rpm wouldn't be a huge detractor. I think with some sprocket math, and wheel diameter, I can get close to that.
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04-24-2021, 08:21 AM | #3 |
Getting Wild
Join Date: Aug 2018
Posts: 82
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Re: Textron 2 stroke to 670 swap
I used the original swing arm from the golf cart, but unbolted the rear axle from it. I then welded a carrier mount for the live axle's bearing carriers in a way that seems reversible if I ever want to revert the cart back to a transaxle later.
The sprint racer used a #50/530 chain, 48T sprocket. I am adding a jack shaft to be driven by CVT. I ordered a comet 780 clone driver clutch for the motor. I am on the hunt for a driven clutch to match but that's getting hard to find. Could really use some advice there. I was hoping the original driven clutch would work but it's got a splined puck on one side. I'd need to bore it out and my lathe won't handle that without new tooling...so I'd prefer to find a cheap 1" bore/keyed driven clutch that takes a 1 3/16" width belt. |
04-24-2021, 08:40 AM | #4 |
Getting Wild
Join Date: Aug 2018
Posts: 82
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Re: Textron 2 stroke to 670 swap
While I wait for a clutch solution, I'm pot committed to the plan at this point. I've gone ahead and created a low sling engine mount and got the engine bolted in.
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04-24-2021, 08:47 AM | #5 |
Getting Wild
Join Date: Aug 2018
Posts: 82
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Re: Textron 2 stroke to 670 swap
Some other fun tinkering while I wait for a clutch solution.
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04-24-2021, 08:48 AM | #6 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,441
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Re: Textron 2 stroke to 670 swap
Cool project! Short timeline though lol. I think you'd be better served using the stock golf cart transaxle/rear end. Less time etc, and with big tires you will get 25-30 mph. It'll handle the abuse of the 670 for the short term. You could weld the spider gears to get posi.
I'm also thinking you'll want to install a rev kit on the engine so you can safely rev past 4000 rpm if you accidentally have to, otherwise you might bend a pushrod etc. Using gear and chain components with belt components is tricky. You also could use a go kart CVT/Torq-a-Verter. Finding one on short notice might be the issue, but it would be a bolt together situation, with only mounting tab fabrication, rather than machine work to convert splined to smooth etc. Just my 2 cents. |
04-24-2021, 09:22 AM | #7 | |
Getting Wild
Join Date: Aug 2018
Posts: 82
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Re: Textron 2 stroke to 670 swap
Quote:
By sticking with a sprocket drive gives me more versatile gearing ratio options, but yes...this wasn't as plug and play as I had hoped. |
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04-24-2021, 09:30 AM | #8 | |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,441
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Re: Textron 2 stroke to 670 swap
Quote:
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04-25-2021, 05:51 PM | #9 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,445
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Re: Textron 2 stroke to 670 swap
Ok, that exhaust is awesome!
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04-26-2021, 05:13 AM | #10 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,441
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Re: Textron 2 stroke to 670 swap
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Tags |
ezgo, live axle, predator, swap |
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