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A Stroke!!!!

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Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
No...not having a stroke, but wondering how much of a stroke your loud pedal has to take
to give you full throttle.
Trying to work out the leverages in CAD and I'd like to give it a nice fine progression from
stop to go.
Denny G
Sandwich, IL

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JTremain Avatar
JTremain Justin Tremain
Oak HArbor, WA, USA   USA
1927 Nash Legion Special "Legion Special"
One kart it's pretty much a toggle switch! without measuring, the other is probably 2 1/2" of travel



"Magic Man"

1927 Nash Modified: Legion Special
"Build" Thread - https://www.cyclekartclub.com/phorum/read.php?2,26661

Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
Tks Justin, what cha got the day off???
Measuring the stroke of the butterfly lever to the governor lever (stock Predator 212) I get only
.5"travel. With a straight pull from the front that would mean I would only need to pull the cable .5".
I'm thinking of using a bell crank at the engine to multiply that .5" stroke at the carb lever.
With a 6:1 bell crank I could get about three inches of
stoke to open the throttle. 3" at the foot pedal would really give you some fine control of the
engine speed. Depending on where you locate the linkage on the pedal would give you even
more control over the pedal stroke.
Just thinkin'!!!!
DG

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Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
And......what sort of spring return is in generally use? I've seen the set up
Dennis T has shown in his videos, is that a store bought item or are you
guys making them yourselves?
I've drawn up my version, in which I'm making the spring pressure adjustable,
but I'm interested in what others are doing.
dg

Woodysrods Avatar
Woodysrods Silver Member Brian Woods
Westbank B.C., Canada   CAN
Good Morning Denny
When I made my gas pedal, I had a set of VKC pedals here, so I used the pivot point measurements
so I didn't have to re invent the wheel.
The pictures I have are poor (never seem to take pictures from that side??
And Sorry, handsome Martin is a bit of a distraction in on of them????confused smiley
But, I made a small steel flag (painted black) that is riveted to the side of my aluminum pedal with a slot and a
countersunk hole for the cable to slide into and with the return spring attached right to the pedal.
I will measure the distance from the pivot to the cable attachment and post picture tonight....but by then you will
probably have your figured out and made anyway/
Brian


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Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
Tks Brian, yep, I think I got her figured out. I'll be putting a bell crank on the motor and for
the spring return, like I posted, I'll have a spring loaded plunger mounted on the side, which
will attach to the cable at the back and to a short heim link at the front. My pedals are swung
from the top and the other end of the heim link will attach at some point, roughly midway, to
the throttle pedal. It looks good on paper, hope it will work that good when I implement it.
I'll post a picture when I get it set up if anyone care's to see it.
I'd like to find a nice sturdy cable that I can cut to length. I like the ones that have the
eyelet at the end but both ends are swagged and I'm not sure if I can cut them to length.
I think they're made for the Manco go karts.
I did some experimenting with a hydraulic throttle but could not get it to smooth enough,
it was to sticky. But that would work super, the one I was looking for was small, light, easy
to mount and easy to route anywhere you want it. We used one on the D-Fuel slingshot dragster
that we were running back in the late 60's but I can't find them any more.
Denny G
Sandwich, IL

Hi Denny,

Is it possible to post information on this bell crank idea? I get the concept but a picture or 2 really helps those of us that learn by seeing and figuring it out.

TX
Mr fixit
Chris smiling smiley

JTremain Avatar
JTremain Justin Tremain
Oak HArbor, WA, USA   USA
1927 Nash Legion Special "Legion Special"
No day off for me! Ah I thought byou meant gas pedal, here's a pic of the engine side.



"Magic Man"

1927 Nash Modified: Legion Special
"Build" Thread - https://www.cyclekartclub.com/phorum/read.php?2,26661


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Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
It's still a work in progress Chris, when I get it made up I'll post some pictures.

And I did mean the gas pedal Justin, actually the whole shebang. But I've got
all the ratios pretty well figured out.
I'm torn between cable or hydraulic or what ever for a throttle link. I'd like to
use hydraulic because it's so much cleaner but finding the right cylinders
is kind of a pain.
In the end, I'll probably just stay conventional with a cable.
dg

1908Rick Avatar
1908Rick Rick Eggers
Cape Coral, FL, USA   USA
Whatever you come up with, just make sure you have positive stops on the pedal to avoid damage to the cable or linkage. I used an aluminum block with a rod from the pedal, which stops the pedal movement both ways, and can be adjusted by turning the nuts. It's also a good spot for a return spring.



Edited 1 time(s). Last edit at 2019-01-30 07:15 PM by 1908Rick.


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carChips Avatar
carChips Victor Harnish
Kelowna, BC, Canada   CAN
1933 MG Magnette
1973 Triumph Spitfire 1500 "Chip"
1989 GMC Sierra 1500 "Bush Truck"
Three inches is too much stroke at the pedal, two is probably enough. And as Rick says, with a pedal stop.



S'all for now!

Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
Good advice, boat of ya's. Nice job of engineering there Rick. I like that
positive design, beats ell out of those standard go kart pedals.
dg

bansil Doug H
Mnt City, USA   USA
I agree 3 is way to much, sit in cart with heels on floor, move your foot, anything more than 2 inchee may mean you have to lift your foot off floor tostab full throttle.
Lots of variables like leg length, leg angles and your bodies physical movement

You don't want to have to raise your foot up for having fun, cramps and overall precision is thrown out the window

Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
Just using 3" was simply an off the cuff example of how easiy you can multiply
the leverage guys, don't latch on to my every word as though it were cut in stone.
What ever I end up with, it will be fully adjustable.

That's a good example Justin. looks like you've got about a 2:1 advantage there
and then you have to consider what happens up at the pedal, which adds a little
more stroke to it. Thanks.

Just ordered a couple of those Manco cables with the eyelet at one end and I've
got some cable housing ferrules so I can cut the cable to the correct length. Would
hate to have to tie a half hitch in it to get the right length!!!

Lot's of planning, ordering, drawing, coffee drinkin' goin' on this week, to damn
cold (-29 this morning) to get much done in the shop. It's all I can do to keep a fire
goin 24 hours so the floor doesn't freeze up on me. Once that happens, I'll never
get it thawed out till spring.
dg



Edited 1 time(s). Last edit at 2019-02-01 04:12 AM by Denny Graham.

Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
Having a heat wave yesterday afternoon. Temps got pretty close to 0° so
I braved the cold and got started on the swing pedals. Gonna work out the
stops this morning, it's already 4° above out there already. Spring is here!!!!!
dg

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