420 to 460cc?

KRAZYMATT

I have a 420cc clone in my cart now. I've been looking On Vegas carts website at all the pArts they sell... I see they sell forged piston for the 440/460cc (92mm) is that the same bore as the 420cc I have or do they have a larger cylinder? Also I read the stroker crank and rod they have can I put that in my motor? Will I have to clearance the block for the rod? Do I need to change the cylinder for the longer stroke? Is the head on the 420cc the same as the 460cc? What can I expect at gain by adding the parts to my motor? I was looking at their:

Crank
Cam
Billet rod
New head milled .050
Valve springs
Retainers
And push rods

The 460cc motor was in test stage when I did my swap and now I'm just lookin for a little more from my cart. Currently have the 420cc clone with offset timing key, cone intake, 200rpm spring in drive clutch, severe duty drive belt, power spring in driven clutch, & driven clutch machined. I don't have a tach so I don't know what I'm turning the motor at now. I still have the govenor in the motor and I get 23mph out of it @ WOT. Cart has 23" tires. It's a 91club car ds with stock rear end and gears. I just ordered the tuned carb from Vegas carts but have not installed it yet.

BGW

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TheGDFP

Your bore is smaller, 90mm, 2mm less than the VC
Stroke is 66, 3mm less


10 bolt side cover is helpful on high-rev builds, and the kit saves you money
http://www.vegascarts.com/product-p/vrx46-bkit.htm

Or, bore your block, buy piston, crank, rod, cam, mill your head.
Lots of options.

Field6565

If you remove the governor and install the HD valve springs you will be quite surprised how much you will gain. That alone with your 23" tires should put you somewhere in the low to mid 30s for top speed. That's a huge jump over the 23mph that you see now.

KRAZYMATT

On Vegas cart site they have that performance grind cam says it works on 390/420/440/460 carts but requires billet connecting rod. The only rod they sell is the billet one for their 440/460. Is the rod the same length on all those
Motors or is the 440/460 longer? I know you said it's a longer stroke on those motor but didn't know if it get the throw from the crank, the rod, or both?

Do I need to use their retainers with the springs also?

Streetbu

35lb springs work with stock retainers. Rod length doesn't affect the stroke, only the crank does.

KRAZYMATT

Thanks. So like a car motor. The longer throw is in the crank. Lycoming airplane engine the crank has different stroke and longer/shorter rods depending the motor. That being said I could run Vegas carts' cam in my 420cc motor if I get the billet rod and new valve springs and pushrods?

TheGDFP

Yep. And it will all transfer over to the 460 if you do a block-swap later.
May as well cut the head while it's apart.

TheGDFP

Chart is for the 92mm flat top, so it starts higher than your 9:1 or so stocker, but you can pick up on the trend.

sho305

I doubt you would see much change swapping the crank for that little bit of stroke. IMO you could easily put the HD springs in (cheap) and pull the governor like Field says a big increase. Beyond that get the rod and cam, you may have to upgrade the valvetrain I'm not sure, but the cam will make a big difference. The stock rod will grenade if you rev it harder than the stock cam allows, it can't oil well enough at high rpm. Get the head milled in there someplace, I had mine cut .050 on my 420 and still run regular with a 4 degree key. Beyond that you have to run premium fuel. A header and free flow exhaust would be good if you don't have. Your 420 will be very close to a 460 with the same parts. If you want to put a BIG cam in and go more wild then better off to start with the vegas block, it all depends on what you plan to do. I got my 420 before 460s were around. With a cam a larger carb will help more, I plan to get a 32mm CV carb. IIRC the stock carb is 24mm on a 420. But I still have the stock cam in mine, stock carb jetted, and 1.3 ratio rockers. I do have a 1" header into a car muffler, and a car airbox fed with 2" pvc pipe for air intake. If you go above 6K rpm you should change the flywheel as well some have failed.

KRAZYMATT

I also got my 420 before the 460s we out/avaloable. Geoff was still testing them. Thanks for the heads up. Gonna try to do the valve train upgrades and remove the govenor sometime soon then eventually get that performance cam and billet rod from Vegas carts.