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Denny Graham

5160 Steel.....For a Real Leaf Spring????

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Ok, just feel that it's only polite to close this thread out since you guys so graciously offered 

your help.

Got the little Quick-Check bounce tester a couple of days ago. I gathered a group of materials,

including the springs, which were the main subject for starting this thread, and bounced the 

ball off of them.

Polished up a small area on each sample with a scotch bright pad on the angle grinder. Some

4140 pre-hard, several old springs and my new ones, some soft 1018, some O-1 and A-2, a

154 lb forged Anvil, in other words, a pretty good selection of different alloys, all steel of course.

They all seemed to comply pretty close to what the industry standard would be for their makeup 

and condition. The springs all ran around 40 HRC, so, I think I'm gonna be just fine with mine which

were just a tad harder than the old factory springs I had laying around from old trucks and cars.

So....the home test although it's not good enough for a certified part, is just fine and dandy around 

mine or a small home shop and just a little better than hitting it with a file. 

Thanks again,

FIN

Denny Graham

Sandwich, IL  

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Thanks for the update, but please don't consider this closed until you give us an update after some driving tests!  

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54 minutes ago, Jerrod Miller said:

Thanks for the update, but please don't consider this closed until you give us an update after some driving tests!  

I second that!  We are all steel junkies here, it doesn't have to be blade-shaped.

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2 hours ago, Denny Graham said:

Ok, just feel that it's only polite to close this thread out

I wanna know more about this car!!! I'm kinda curious about this thing. I'm also curious if the 40hrc was too stiff. Man there is a lot of things I wanna know.

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Well thanks for the grand welcome guys. There is a web site for Cyclekarts, it''s call the Cyclekartclub.com

and at times over the past couple of years, I'll post a comment over there, but they keep taking shots at me

over there because I'm to long winded, can ya tell? And......sometimes I post my personal opinion......which......

sometimes differs from the old experts over there, who don't take kindly to anyone who color's outside the

lines that they've drawn.

With all the work around here and the different directions that I seem to get pulled off in, the Cyclekart looks

to be well off into next year. If I had chosen to use off-the-shelf parts and a conventional construction, it would

only have taken a few months to throw one together, but noooooo, I gotta try to make all the parts my self, and

to my liking. 

So....is 42 HRC to hard???? Well time will tell. My plan is to use the pasture on the back side of my property for a

mini road course, that's on dirt of course. So.....that should give the front suspension a pretty good work out. 

I'll be building friction dampers to keep the wild oscillations under control. The rear is a solid axle as on most gokarts.

I'll post how the 5160 holds up under duress  when I get there.

And again, thanks for the help.

Denny Graham

Sandwich, IL 

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I will be patiently waiting for updates!!!:D

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Well I appreciate ya'll helping me out last fall so here's a brief update.

I manage to get back on the project after the holidays and yep, 42 HRC is a might stiff for those springs. Might

even be a bit to stiff for the weight that the pair will carry. The Cyclekart won't be running till spring, but with it

down on all four now, I can put some weight on it and it doesn't give very much. Now that might be ok at 50 mph,

and I'm gonna mount a GoPro up front when she's running so I can see how the springs are working. I'll be using/experimenting

with a homebuilt version of the Hartford friction dampers that were typical back in the 20's before hydraulic shocks became

the norm.

Thanks again for the advice and ya'll have a great 2019.

Denny Graham

Sandwich, IL

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Back on the Riley 08.JPG

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On 1/18/2019 at 4:46 AM, Denny Graham said:

and I'm gonna mount a GoPro up front

Thanks for the update Denny. Looking forward to more.

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Holy smokes man!! That is awesome!!

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:o!!!!!

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