Offy midget: Clutch Cam !
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- เผยแพร่เมื่อ 7 ม.ค. 2025
- Ivan and John were having a few issues with the stiffness of the new clutch pedal on the Kurtis Kraft Offy midget. As detailed in previous videos, they had come up with a solution and decided to try it out.
Several Shed Racing fans had pointed out that it wouldn't work... but undeterred, they tried it.
Many thanks to John H, Jon B and Steven for their diagrams and everyone else for their helpful comments.
Anyway this video details their efforts and then a new solution devised by Ivan's son Tim.
Happy New Year everyone.
If your design ends up galling, you could mill a slot in the cam and drill a cross hole, place a wheel in the slot and an axle through the hole and wheel. Makes a roller cam!
Keep up the good work
JIM
I liked John’s housekeeping near the end with his feather duster 😂😂. Another great video, well done team
Congratulations Suzy on passing your probation. Your a keeper now.
The cam follower could use a roller bearing instead of sliding friction on the cam surface. (just my 2cts) That will improve the return action too. Nice work altogether!
Beat me to it!✌👍
that seems very good idea.
I was thinking roller myself. That said, the cam seems to work very nicely.
yes, we all live and learn, even at your age, well I am only 76 so I have time to learn, great stuff sir.
That mower could compete in the Festival of Slowth mowing event.
All the comments are good. Many solutions to cam wear, will help. Anything from hard chrome to facing the flat cam follower with some phosphor bronze.
Look for some spray on graphite, it dries and sticks well whilst repelling dirt and grit.
Rocol make a good product for the railways. (Switch plate spray).
I am happy that the clutch mechanism is sorted out thanks to Tim. You guys did a nice job on the cam and lever. I am also happy Suzy passed the "probation period". She has been doing a great job with the camera among all the other things. You guys are a pleasure to watch. Keep up the great work.
apart from the offy evolving shed racing is really evolving too with suzys great camera work and editing its all getting very good indeed thank you to everyone
Wonderful as usual! Always a joy to watch. Next up after the Midget…we restore the mower! Years ago I rescued an old cast iron garden roller that had spent years in a ditch. It took me three weeks work to get the drums to free from the shaft but when cleaned up and greased, they were so perfect that they slid on and fitted like pistons..perfect and clearly beautiful metal approx 90+ years old! keep on with the Good work! 😃😃😃😃😃
When you mentions Imperial system and the metric system reminded me of the $125million Mars Climate Orbitor that was made between France and America they got MPH mixed up with KPH and it crash into the planet. Happy New Year to you all.
Oh splendid. The second mower in my life! Villiers engine and hand clutch and stride out like a man! The first mower was a broken Rotorscythe which I renovated in our cellar aged 16 and then the Atco was acquired and I learned about Villiers engines. Boiling the barrel in caustic shade in a galve bucket like my Father told me he did with motor cycles at Brooklands. Hurrah for Suzy’s Atco, reminding me of something I had forgotten!
Case Hardening is "the ashes of virgins". Suzie is priceless. Great result on the clutch mechanism. Happy New Year team.
Well done gentlemen. I had thought a 'comma' shape, but the cam lobe is perfect.
Also got a kick out of seeing John, in the background during the 'book report', sweeping what I assume were cobwebs from the ceiling. I was doing the same thing just before watching this video! Cheers all!
It is a higher order of intelligence to admit that one has made a mistake. I wish you would come to Indiana, in the midwest of the United States. Susie, again your participation in these videos, camera work and editing are simply outstanding. Would still like to see the brass build tag on the cam cover. That mower looks simply fabulous.
Check out Fitting the Body 2 video - 6.10 for brass plate
Congrats Suzy for making it into the club, thanks for keeping on his toes, looking forward to your trip!!
Something I learned years ago when trying to understand switch cams which can be both face and rotary was to convert them to a linear cam and then wrap that form around a shaft or convert to face. It was an interesting drawing and taught me much at the time!
If you look at a rocker arm for an engine with a roller bearing on the cam follower you can do the same thing to eliminate friction on your clutch actuation system.
Thank youfor the wonderful cam explanation, it's too bad Tim wasn't in the video, it would have been nice to see him !
He could have made a CAMeo appearance.
I'd just like to commend you on the quality of your merch mugs, smooth all over and feels nice in the hand, none of that slap a transfer on it rubbish from Shed Racing!
Only the best for our followers !!
That Tim's a real chip off the old block. 🙂
Great progress, as ever it's genius engineering! Loving the 'new' mower too!
A very elegant solution to the clutch problem. Happy New Year.
I noticed John on anti spider duty He is really able to multi-task. Joking aside a great video as usual Best Wishes to you all for the NewYear
Brilliant job on the clutch, hope my drawings helped you to come up with the solution. Love the mower Suzie, am looking forward to seeing you strip and rebuild it. 😀
Yes John your drawings were greatly appreciated - thank you.
2:20 NASA moon landings were all acheived with their AGC (Apollo Guidence Computer) using metric units. The American military is also 100% metric (since the US Metrication Act 1975).
And the Mars Orbiter famously crashed because they mixed English and metric units: pound-seconds / newton-seconds.
125 million Mars Climate Orbiter 1998 they forgòt to convert the measurements from part made in Europe I belive.
Brilliant stuff, thanks team, ps don’t fall out
Love the sniggering about the lube.
Happy New Year.
Thank you for the update.
That ATCO reel looks brilliant, ideal for grass tennis courts or bowling greens.
Allen Millyard has a similar one and did a video on it, and how well it runs..
I believe they came with a Binks Senspray carburetor.
Other potential fixes are using a small roller bearing mounted off-center as the cam, or an over-center spring linkage would help by holding the pedal up then help hold it depressed, or a lighter diaphragm spring in the pressure plate.
Please visit Australia. I would be delighted to meet you guys.
Lovely bit of filing lol.. suzies comments are a hoot.
Rather than change the profile on the cam you could drill and tap the follower bracket to allow for threaded bolts that you can fine tune the clutch pressure also would be a replaceable wear part
Put a radius on the pad that the cam rides on it will give you the control are looking for.
My old Atco bowling green machine the same as Susies had a 20 blade cutter.
Can you not use a roller on a small shaft with a grease nipple for the contact action.
Would a bronze bushing in the crankcase hole for the cam pin help?
Nice idea of the cam lobe, but will you need to fit a spring onto the clutch lever to keep downward tension on the lever onto the cam? Enjoyed the video! Cheers, Paul 🤓
I'm now waiting for John to cut the Grass in the spring .
Our left foot is extremely strong as a driver. Whilst our right foot is extremely sensitive. Swap your feet around on the pedals and you’ll see exactly what I mean. I think the clutch will work absolutely perfectly. Well done!
Just hit the brakes wit your clutch foot...
@@timjames7869 that would depend on wether you are right or left handed. As a lefty my left foot "is" stronger.
Will the force take out the thrust bearings.
I have a 1921 Atco and an instruction manual in pdf form. How do I send the pdf + picture to Ivan/Suzy? Great videos, thank you.
found the email, picture and pdf sent
Thank you
Great mower Suzy
High lift clutch cam with weight reducing ear lowering for aerodynamics means race season is near. Cheers! 😎👍🏎🏁🏁
We need a "Suzie comments" clip. Great humour :)
I thought Ivan said to Suzy that they had to "go and pick up her 100 year old MOTHER"!😁😁 Great stuff Ivan, keep it going!
My mother is only 80
I just noticed that your intro is a winter scene
I love this channel ❤
Ivan, can you make a short vid explaining WHY it didn't work. Thanks. Loving your stuff.
I still think in old measurements!
I actually had access to a set of Whitworth tools back in the 80s ! But having been taught inches, both fractions and decimal, it is still difficult to think in metric. And I can’t imagine British Standard, is there a British non standard? Confuses me, if that was the intent, it was surely successful 😊
Neat haircut Ivan
Hi Ivan and John. Didn't British Leyland use that type of shock absorber on the Sherpa van? Happy New Year.
This why American oval track cars that had clutches used a lever outside the car; all the leverage you might want and no instrusion on the gas or brake pedals.
I remember the American spacecraft that crashed because when designing the software one boffin was using Imperial and another Metric.
Use a roller bearing on an eccentric shaft
Ivan and sue, it's possible to transit through Australia to New Zealand. So could visit Australia going to and from NZ
we are looking in to this option yes
@shed_racing thank you for the reply. It is always appreciated when a poster actually reads the post.
WHERE IS THE NEW SHOP CAT???
We’re not getting another 🐈⬛
Alan Millard has got a lower the same as that one
I have a book titled Offenhauser, The legendary Racing Engine and the Men who built it written by Gordon Elliot White. You are welcome to have it, if you wish. I really enjoy your channel. Keep the good work up.
Casenit, the stuff that is so carcinogenic it hasn't been available since John wrote Elvis + Buddy on the tin.
The world’s fastest Indian came from New Zealand!
Hey guys, if you come to Australia I'd love to get you down to our car club for a meal with the members.
We're the Vintage Car Club of Australia North West Tasmania.
I will organise a club members car display in Ivan's honor or something.
Please come down here, everyone goes to the mainland but Tasmania is the most beautiful asks welcoming place in Australia with a huge vintage and veteran car culture.
You've acutaly copied the milling M/C lever the other end of lever shaft is a pinion gear its teeth working on the rack, similar to the cam working on the clutch lever, in fact the pinion gear is a rotary lever that works like the cam so I was told years ago.
I can't believe you haven't looked for a pressure plate with less strength. You don't need a competition clutch......and don't forget that THAT PRESSURE is transferred to the crank thrust bearings !!!!
Ivan just has to file on something!
👍🇦🇺
A hydraulic actuator could be an easy solution and pretty much guarantee "smooth" operation.
You could have easily used a roller setup or even a bearing instead of that cam.
20mm for the continental lads ........ however did Concorde get built ? 🤣
With about a month of arguing. The 1st engines had been built in imperial sizes which wood have took a bit of mangling on the French plane and I’ll bet there was a lot of other similar thing however it all got sorted surprisingly well
mom and dad are fighting today :(
bit of friction today
Americans crashed a probe into Mars because they used Standard units (they don't use imperial) when the vehicle was designed in metric (as is all scientific processes etc , including the US military measurment)
Your cam design will be fine as long as you don't race on a dirt track.
That's Millyard and mower lol
For the limtted use your clutch cam will get the metal to metal friction with moly lube should work just fine. How about a felt pad fixted to the moving arm above the cam rubbing on the cam saturated with the moly lube? And before use a shot of lube on the felt. Great back garden engeneiring in the British tradation !