DIY Go Kart Forum

DIY Go Kart Forum (http://www.diygokarts.com/vb/index.php)
-   Go Kart Discussion (http://www.diygokarts.com/vb/forumdisplay.php?f=6)
-   -   Engine selection help (http://www.diygokarts.com/vb/showthread.php?t=42381)

Rhill 11-12-2019 08:44 PM

Engine selection help
 
Ok guys so I have a buggy that I acquired in a trade. It currently has a gx390 on it. But the buggy is pretty heavy prolly 800lbs or so give or take. Does anyone know of a motor thatís stronger or makes more power than the gx390. It rolls it pretty good on flat ground but not so good on up hill and stuff. Any tips or advice would be great.

950speed 11-12-2019 08:47 PM

Well let’s see some pictures of what you have going on:
-transmission
-whole buggy
- gears


It could be that it has the wrong gearing. So let’s see what you have got and we can go from there. Starting the process of elimination which could turn out that you in fact do not need a new engine and you could save a lot of $$

Rhill 11-12-2019 09:17 PM

Ok I’ll have to take some pics of it in the morning when I get to the shop. I can get pics of the buggy and gears but I’m not sure about the transmission not to sound dumb but I didn’t know it had one

Kartorbust 11-12-2019 09:18 PM

As already mentioned what will help us determine a solution to your problem:

1. What is getting power to the wheels? CVT (what kind)?

2. What kind of gearing is on there now?

3. Tire size?

You probably want close to 8 or 9:1 gearing to move that much weight around.

Pictures of the machine and drivetrain will be helpful. Most engine swaps that will help out will require modifications to the frame and may not be cheap.

950speed 11-12-2019 09:19 PM

It’s probably either a clutch or a torque converter, it’s wha connected between the engine and the axle


The chain connects the trans to the axle.

Transmissions don’t have to be a thing that shifts gears. It can be one single gear, it’s all used to transfer rotational energy in our case

Wilson_Engine_Shop 11-12-2019 09:45 PM

Have you thought about a predator 670cc? It makes more power and torque than the 390cc but you'll need a 40 series TAV to not burn up belts

Kartorbust 11-12-2019 10:00 PM

With the 670, its huge in comparison to a GX390 and will require extensive modifications. Plus a 40 series may only hold up for a bit. A larger CVT will be better suited, but all that comes at a cost, about $1500 for engine and suitable CVT.

itsid 11-12-2019 10:59 PM

800 lbs?
What's it made off?? lead pipe?

'sid

Randy H 11-12-2019 11:30 PM

3 Attachment(s)
How about this bad boy?

38ft-lbs of Torque @ 2200rpm!
Shipping Weight = 89lbs
$899

https://vegascarts.com/collections/e...lf-cart-engine

itsid 11-12-2019 11:41 PM

625cc single cylinder?
oomph I say.. OOMPH!

'sid

Randy H 11-12-2019 11:58 PM

Quote:

Originally Posted by itsid (Post 536646)
625cc single cylinder?
oomph I say.. OOMPH!

'sid

That and a good clutch setup it would pull my Civic around, heck it might pull my F-350. But I'd miss the turbo spoolin' up, lol.

Budget GoKart 11-13-2019 05:31 AM

Oof that's a big single cylinder

Kartorbust 11-13-2019 06:45 AM

Thumpers are great for the power. When you half to pull down a house with a golf cart, you get a thumper.

Budget GoKart 11-13-2019 06:51 AM

Quote:

Originally Posted by Kartorbust (Post 536651)
Thumpers are great for the power. When you half to pull down a house with a golf cart, you get a thumper.

Do briggs 8hp i/c's count as thumpers or? But dang over 600cc ohv single cylinder what do you put that on, a Chevy c10? Lol?

J.S.@SMS 11-13-2019 07:23 AM

Nah, I'd use the one cylinder on my drifter (200 pound kart with 23hp, what could go wrong?), and a blown 454 with just a bit on NOS in the c10. Wet system not dry of course.

And we could use some pictures of the drive setup and some sprocket tooth counts.

Kartorbust 11-13-2019 07:36 AM

Quote:

Originally Posted by Budget GoKart (Post 536653)
Do briggs 8hp i/c's count as thumpers or? But dang over 600cc ohv single cylinder what do you put that on, a Chevy c10? Lol?

I have no idea on displacement cut off for a thumper or not. I think it's generally just a nickname for single cylinder engines.

JTSpeedDemon 11-13-2019 10:21 AM

:iagree: with these guys.
That GX390 will move that buggy just fine, it all depends on gearing.

:smiley_omg: :eek: A 625cc single cylinder!!! Can you imagine the ridiculously loud exhaust and the vibrations!!!:ack2:
But man, that thing would MOVE!!

Rhill 11-13-2019 12:49 PM

Quote:

Originally Posted by 950speed (Post 536626)
Well letís see some pictures of what you have going on:
-transmission
-whole buggy
- gears


It could be that it has the wrong gearing. So letís see what you have got and we can go from there. Starting the process of elimination which could turn out that you in fact do not need a new engine and you could save a lot of $$

Ok so it has a torque converter and the sprockets the small one has 8 points the back has 62 and it has 12 inch tires

mckutzy 11-13-2019 12:59 PM

Nice... a new contender for the big block crowd...Odd.. doesnt say shaft size....

Looks like they use the head off of a 670 onto a modified big block....
Cool.... heavy though... needs a gastank..

950speed 11-13-2019 01:20 PM

PICTURES!!

Let’s see it all
Including the torque converter. You said you would now where are they?


All times are GMT -6. The time now is 10:08 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.