info needed on bike chain and sprockets for a bike engined car

[PHULL]

ok I am building a bike engined car.... and I am moving onto building up the rear end. the plan so far is to fit a 520 sprocket onto a differential of a small car (Mini diff ) to power the rear wheels. The engine will be a Hyabusa/Kawasaki Zx12.

No I could go and buy a after market sproket but they have all the holes in the wrong spots for where I want them. I also posted on here before about a simala subject. An I think it was Bigmuz who recomended using industrial sprockets for the job. would someone know what size sprocket would relate to a 520 or 530 size bike sprocket.

Cheers

[PHULL]

ok did some research I hope this will help someone else out.

So you have a 520 motorcycle chain, and you want a sprocket

a 500 series chain has a pitch of 15.875 mm

the last two digits relate to the sprockets width 20= 6.35 mm
25= 7.94 mm
30= 9.53 mm


Am I right?

[carcrazy]

Look at this site www.dpcars.net this guy is building a bike powered race car called a DP, its a pretty interesting read and might give you some ideas.

[gxxr]

I'd be more inclined to run a 530, most of the published tensile strengths I've seen are in the range 10~20% greater than a 520.

The bike guys use it for a weight reduction of a few grams, but they never see the shock loads you'll see in a car and if it breaks, more likely than not you will take out the cases.

Have heard The Chaingang will do a custom sprocket, worthwhile getting a split one for hassle-free ratio changes too.

[PHULL]

looks like the 530 is the go cheers guys thats an impressive website

[Jay_G]

if you are running a diff, if possible turn the engine 90 degrees so the sprocket is facing the rear of the car, get a propshaft fabbed up and get the sprocket drilled and tapped so the shaft bolts straight up.

or i have seen adaptors for sale somewhere on the net pre fabbed for this purpose.

[PHULL]

narr it would take up too much room if I did that. I have seen them do that to the Lotus 7 clones, seems to work very well. I also want to use this perticular system because it allows easy changing of gear ratios.

[Shifty]

There are various different sizes but 520, 525 and 530 are the most common. Basically anything modern with reasonable power runs a 530. If I was you I'd be looking to run two sprockets and chains in parallel, given the extra load of a car.

Either that or do a search on some of the drag bikes (read: turbo hayabusas) and what type of chains they're running. Plenty of Hayabusas into the 8s and you don't hear of many catastrophic breakages, so there must be somethign strong out there.

[Chad]

How is the engine laid out? If it was north south, in the front of a car, you could have a flange to the output from the gearbox, and join it to a tailshaft?

[PHULL]

It's mid engined (at the rear of the car) with east west layout like a motorcycle with a chain runnning to the diff at the rear that is fitted with a industrial sprocket.

[Nero]

speaking to the HC guys re their chains and they do seem to get replaced faily often. Brett Hetward certainly goes though a few, or at lest replaces them fairly often. To in series sounds like a reasonable solution, though it will of course lead to further loads up the transmission.

[PHULL]

according to Scott Innes ( runs a simalar setup) he runs a 530 chain to the diff and then a 620 ( used in drag bikes) chain from the rear diff to the front. He would have to replace the 620 chain after every run on Race to the Sky. I also noticed he kept shimming out the rear diff to accomodate for the slack in the chain becuase it had streched.

Replacing a chain regulary isn't an issue for me

[gxxr]

Always thought this was a pretty neat solution to stretch rather than shimming the diff carrier. I believe quite a few of the FSAE teams do variations on the eccentric theme.




Gotta guess HCs are classed as speed events, what's the proposed solution for reverse?

[PHULL]

Always thought this was a pretty neat solution to stretch rather than shimming the diff carrier. I believe quite a few of the FSAE teams do variations on the eccentric theme.




Gotta guess HCs are classed as speed events, what's the proposed solution for reverse?

Yeah i was considering doing something like that but I was worried about the eccentric bearing carrier moving on a hard launch thus giving you a slack chain again. It also has a limited amount of adjustment.

[PHULL]

Yeah the Hillclimb is a speed event. According to the Cams Manual you don't need reverse unless it is required in the supregs