Hi all,
I am just working out what my future steps will be with my SV650 drag kart project, I am pretty sure that the kart tyres will be able to handle the power put down as they are 220mms wide and are slick (with choice of compound) but I was also thinking about tyres that might last slightly longer than kart tyres.
I was thinking about maybe using a 10" rim (with a common PCD like those used on the mini) and run some track day tyres on them after adapting the hubs from a 3 stud to a 4 stud.
I was just wondering if the semi slick track day tyres would be any good for drag racing as they are designed differently.
I believe the semi-slick road tyre has grip but also stiff walls which isn\'t ideal for a drag tyre. I do use a pair of R888s on mine for some drag days and just run them at a low pressure.
I\'d see how you get on with the kart rim and tyre combos. I wouldn\'t go for outright grip straightaway without checking how it will load up the rest of the drive train.
There aren\'t many trackday tyres for 10 inch rims. The only one I can find is the Yokohama A032 in a 165/70 R10.
However if you\'re looking for drag racing stuff then have you looked at stuff for Junior Dragsters? Those little things you often see at the Pod, they must have similar hubs to a go kart.
http://shop.viperizerracing.com/category.sc?categoryId=32
These sort of things!
Quote from: Will66;837818There aren\'t many trackday tyres for 10 inch rims. The only one I can find is the Yokohama A032 in a 165/70 R10.
However if you\'re looking for drag racing stuff then have you looked at stuff for Junior Dragsters? Those little things you often see at the Pod, they must have similar hubs to a go kart.
http://shop.viperizerracing.com/category.sc?categoryId=32
These sort of things!
Ah ha! I saw a video of a GXR 1100 powered drag kart, they had hoosier radials and a 4 bolt hub/wheel, I have always wondered what wheel that was and now it seems I have the answer!
I will have a look around for some junior dragster hubs then if I need more grip, the standard kart hubs are 3 bolt rather than 4 bolt. I might get myself some 6" superkart rims rather than the standard 5" kart rims. I currently have some Dunlop slicks used on the 125cc gearbox karts, they are 5" rims with tyres that don\'t blow out at 100mph. I will see if those are ok for grip, if not I will upgrade to a set of 6" superkart rims with superkart tyres (superkarts run at 90bhp @ 140mph) but my SV650 engine has more torque.
I think the plan will be:
5" rims with Dunlop tyres for 125cc kart
6" rims with superkart tyres
Junior dragster radials
I think the turbo fireblade drag kart seems to be running on 6" rims which runs low 9s so im hoping that as im not running as much power (but lighter) the tyres will cope.
Its not too much of an issue with tyre cost as a full set of 4 125cc kart tyres are around £140, the full set of superkart tyres are I think around the £180 mark.
Viperize Racing sell the hubs and rims. It does look as though junior dragsters run on 8" rims though.
Quote from: Will66;837826Viperize Racing sell the hubs and rims. It does look as though junior dragsters run on 8" rims though.
Yeah but I would get hit by higher costs to ship it over lol I would also need to figure out the correct gearing ratio again as well as I have current worked out what I need with a 5" rims and tyre.
If I did bolt on that 8" rim and a tyre then my theoretical top speed would be at around 220mph :D it would do about 80mph in 1st lol :D
That all looks like an epic win then :)
Do it, challenge the heliocentric model of the universe and demonstrate that all celestial bodies revolve around your Galatic Size gonads for that is what driving a motorcycle-engined go-kart at 220 mph would do.
Also, a resounding demonstration of faith in your mechanical ability.
Quote from: Will66;837834Do it, challenge the heliocentric model of the universe and demonstrate that all celestial bodies revolve around your Galatic Size gonads for that is what driving a motorcycle-engined go-kart at 220 mph would do.
Also, a resounding demonstration of faith in your mechanical ability.
Lol I think that the gearing might be a bit too long for the engine, although it does have more torque. There was 1 other guy who had built a SV650 powered kart but he used the OEM kart sprocket so had a top speed of about 40mph (bike has 17" wheels, kart has 5" lol).
Even the turbo fireblade kart that ran a 9 second pass got to about 130mph, the SV650 bike does the 1/4 mile in around 11 seconds @ 110mph, there isn\'t enough track to max something like this out.
At redline in 6th gear technically it could reach around 140mph but yeah....no thanks lol
With regards to the mechanical ability on the build, im doing as much as I can myself (as I want to make sure everything is how I want it) but for the engine mounts I am taking it to a friend who works in the aerospace industry, hes a master metalworker who can weld anything to anything lol so he is doing the mounts. Everything else I have got on the kart is off the shelf though, keeps costs down.
Perhaps not then, ah well, what about running a bigger sprocket with the 8" tyres?
Quote from: Will66;837849Perhaps not then, ah well, what about running a bigger sprocket with the 8" tyres?
I will keep the rear sprocket the same - its quite hard to find a 530 sprocket with a 50mm taper bush like that, I can drop teeth on the front sprocket though, im running an 18T \'busa front sprocket rather than the standard 15T.
Will see how these tyres go, I might be ok :)
I believe the semi-slick street tire has hold but also firm surfaces which isn\'t perfect for a move tire. I do use a couple of R888s on my own for some move times and just run them at a low stress.