S3 E35. The 670 cc Predator powered Renault has a bad day. Can we fix it?

[@siraff4461]

This looks like exactly the same problem I had when I was racing offroad karts in the 90's. The engine locator/adjuster mount vibrated loose, allowed the engine to move a little forward and torn through a belt. A few belts later we looked into it and it had ever so slightly warped both pulleys. We did the same thing as your shim by tightening the adjuster past its normal location thinking it would help and all it did was rip them up faster from higher tension. The problem was where the pulleys had warped they were allowing slight over extension and the result was exactly what you have there. It happened a couple more times on new pulleys after a while without the adjuster going out so we ended up bonding a loop of old drainpipe to the inner of the pulley. Just wide enough that the pulley could still go through its full extension but high enough that the belt couldn't fall into it anymore. It worked and we never had an issue from it again.

[@RandoCalrissian1]

Good diagnosis

[@RandoCalrissian1]

@ClickOnProfile1152 I'm glad you found out what was wrong. Super pumped to see what the insight with the turbo diesel can do. Love the channel.

[@vintageyamahasquid]

To be fair though, that burn out was awesome.

[@Ryanvd1]

Watching Robot Cantina and sipping a cup of coffee just go together so well.

[@stuffandjunkandthings364]

Doing the exact same thing. Bout a million other things I need to be doing this morning, but it's gonna wait until I get done with this video. Because evil garden Gnomes.

[@surf4luke]

Yup, perfect Sunday morning

[@richardschaefer3889]

That's my Sunday morning routine.

[@Dan-vq4pz]

Dude me four

[@NMWanderings]

Me too.

[@jarrodwidiger5472]

Watching you diagnose a problem is every bit as good as seeing the results of you next mod

[@thedude7726]

So with exhaust wrap get some high temp exhaust paint and really hammer the wrap in paint. Do this 2 or 3 times and it helps a ton with the fiber dust and second it helps the wrap from asorbing water. I do this on all my mini bike builds i do and it makes a HUGE difference. And cvt belts need to be heat cycled and broken in

[@222atchibell]

Thanks for all your testing and tuning. We appreciate your videos.

[@goosenotmaverick1156]

Jimbo, for future reference, paint the header wrap after install with high temp paint for headers etc. The company that manufacturers the wrap i have used in the past "DEI" makes stuff to do this on their wrap. Makes handling a breeze, and keeps those silly little fibers from angrily stabbing you a million times. Soaks it up though, so be prepared to really lay it on. Smokes like hell when you start it up the first time too, definitely do that outside. 😂

[@Ian-iu2tl]

A real cliff-hanger when you were trying to make it back to the shop. I was so excited I forgot to put milk on my Cap'N Crunch.

[@daviddroescher]

That was torcher.... at the end of the show,why isn't this stuff softening up? Where's the milk? Still sitting on the counter. when the scout master forgot the milk on a camping trip. Wee all chewed our mouths bloody on the captain crunch. The trips was the only time most of us got factory sweetened cereal

[@Head5hot81]

Was your mouth as torn up as that belt?

[@daviddroescher]

@@Head5hot81 by the end of day 2 ,ya .

[@Ian-iu2tl]

@@Head5hot81 Yes...but not half as torn up as the kids when they found the empty cereal box on the coffee table.

[@Ian-iu2tl]

@@daviddroescher Well...they'd prime us on road gravel and then swtich to the deady Cap"n Crunch once our gums had calcified.

[@ron827]

You could put a spacer between the pulley sheves to prevent them from closing tight enough to force the belt high in the pulley.

[@davidjernigan7576]

Perhaps it's time to upgrade the cvt to the higher HP rated one since the current assembly is pretty well used up

[@BeardedFrog]

It would be both a logical and entertaining choice to improve the transmission system. If nothing else, even when this system "works" it is a MAJOR factor in how slow this car is. The shift times are like 1-2 seconds long and the main reason behind always starting in like third gear. No matter how much power you coax out of these little tiny engines this is always going to be a massive limiting factor that is only going to get worse and cause more issues down the line.

[@andrewmeadows2596]

Thank god it never locked up at 50mph. Love this channel

[@reverse_engineered]

I've been there! I had a manual transmission with a slow oil leak. Refilling it was a bear and I put it off for too long. It locked up at 100km/h on the highway. Thankfully it was a rear wheel drive, so the skid was very straight, but I needed a change of pants afterwards.

[@white_mage]

@@reverse_engineered it was the esc keeping you on a straight line. locked rear wheels will rotate the rear end.

[@Taydrum]

Thank god there's no traffic in Kansas

[@yourhowhigh6635]

I'm so early it feels criminal 😮

[@Shmoozo55]

Just a small suggestion ... perhaps set up a cheap backup style camera pointing at the CVT pulley and belt so you can have a small monitor up on the dash that allows you to keep an eye on that.

[@giggiddy]

Maybe im wrong. But Im not sure everyone can appreciate the hundreds of hours and thousands of dollars all of this custom design and fabrication work eats up. Love your narration and that you answer any questions I may have. And the fact that nearly every part is either a one off or super modified. Thanks for what you do as this goes much farther than the obvious. You are pushing physics and explaining engineering in such a cool and entertaining way. Just thanks for everything and please dont get frustrated and stop. Thats my biggest fear. Cheers

[@subynut]

Man, them Gnomes royally fouled up your plans! lol

[@craigc1130]

Love watching your videos on Sunday morning makes me want to work on my projects

[@ElZamo92]

I love that you're as hardcore about this as a lot of people are about their 1000hp drag beasts...

[@PioneerRifleCompany]

This was stated previously from someone else, but your driven and slave pulleys are not in alignment, which is a big factor in how long the belt lasts and the efficiency of the power transfer. Great videos and I appreciate your content!

[@harlanbarnhart4656]

That Future Jimbo guy seems like he knows what he is talking about. You should probably consult him more often. He probably would have warned against donuts on dirt. It was an epic burnout though.

[@lawrencetaylor5481]

Has anyone ever told you you sound like Ray Magliozzi aka Clack from Car talk? I think that's what drew me in at first. I loved that show and being from the east coast, specifically Massachusetts, I grew up with them and miss it very much since Tom aka Click passed in 2014.

[@jamesspeck4151]

Although it was a different application, I remember fighting a similar problem with the belt riding too high in the drive pulley, even though the distance between the pulley centerlines was exactly where it was supposed to be. Alas, it was a LONG time ago, and I can't remember how I solved the problem! I'm going to go nuts trying to remember! Good video!

[@chilternsroamer872]

Nice to see the gnomes "helping" again. Self-replicating gnomes could be a good thing or a bad thing.

[@michaelblacktree]

If those gnomes discover cybernetics, Jimbo is screwed. Imagine the Borg, in 1/4 scale.

[@nilo70]

Tribbles, lots and lists of Tribbles ………

[@Jeffsa12]

Ready to give up on the torque converters? Try a multi v belt pulley arrangement with movable idler belt tensioner for clutching and overall gear reduction? That way you could use the car gearbox as intended and possibly a bit more efficient power transfer.

[@Kuldeep_Giri]

At last something to watch

[@ExpediteTravels]

Well at least you didn't have a long walk or have to hire a tow truck and you figured out what was wrong which is a good thing Thanks for the video Jim

[@jeremypilot1015]

You'll get it straightened out. This is going to be an amazing car when finally sorted.

[@DA-zh9gi]

Love the little pig cheering your drilling on... "Yeeeeee"

[@johnlease2369]

Yepper you broke the rubber band. On my project I'm using a centrifugal clutch which requires gearing more specific towards your speed/ torque requirements. I've went the torque converter way and as your finding out was problematic with the vehicle weight. Converting to a snow mobile type torque convertor would probably take the load better but space is a premium..

[@bobroberts2371]

Italy belts I've noticed that some industrial equipment / parts come from China through Italy. Also, Comet isn't going to make their own belts, they are going to contract with companies like Gates / Dayco / Bando Comparing the marking fonts might pin down who makes it.

[@454Burban]

Like Jimbo said, nearly everything that comes from the Jungle Site is suspect; and that's mainly because the majority of items sold there are from Jhina, and EVERYTHING that comes from Jhina is suspect. The Jhinese wouldn't think twice about making a poor-quality belt and stamping "Made in Italy" on it. Shady is their Industry Standard.

[@johnfunk4313]

having worked with export items in the past, relabelling and repackaging can sometimes cost more than the part itself, and thus the biggest "cost" is in whatever country does that, which means you are legally allowed to label as manufactured in that country. So buy parts from China for $2 and spend $3 packaging in Italy, and sell in USA at $50 labelled as Made in Italy.

[@bobroberts2371]

@@johnfunk4313 I once visited a " factory " in the USA to look at a chain conveyor ( like a SF street car where a cable under ground pulls the car ) They were putting 2 pre made assemblies onto a pre made main assembly then installing another pre made part over the first 2. The item was filled with oil then packaged. These non US parts are now considered " made in the USA " or at minimum, " Assembled in the USA with imported parts " These items were destined for use in an assembly plant where US and import content % is officially listed.

[@454Burban]

@bobroberts2371 @johnfunk4313 As disturbing as that is - and as a patriotic American, I find it VERY disturbing - what I find even more frightening is the fact that American beef cattle (and likely poultry and pork as well) are being slaughtered here in the U.S., then shipped to China for processing, then shipped back here, and then ultimately packaged as "Fresh USA Beef". Having our immoral enemies processing our FOOD is terrifying on its own; but even if we naively believe they're not doing anything shady to our meat, just the fact that the raw meat is crossing the Pacific TWICE, in containers of questionable sterility, and then being sold as "fresh", is a huge issue to me. This info comes directly from cattle ranchers, who aren't happy about it, but don't have any control over it, because the USDA and FDA don't find anything wrong with it.

[@Ridinfixinman]

Just in case you didn't already know, adding the shim to correct the center to center distance will effectively increase your starting ratio in the CVT system because when the drive or primary clutch engages, it will take up the slack or deflection in the belt and run it up the sheaves. Less deflection means that it won't ride up quite as high in the primary clutch and give a (typically) more favorable starting ratio. And of course this can possibly affect the outcome of your tests... probably not too much though.

[@Fantaman900]

No testing? You did bench testing of the CVT and found crucial problems. I call that progress!

[@jftureson]

never regret doing cookies. Full send or no send. Good show!

[@jasonz7788]

Gnomes , future Jimbo pure comedy gold hahaha. Thank you for the laughs sorry you got stuck

[@Theonixco]

Oh that awesome sinking feeling of knowing somethings wrong and you're doing everything you can reasonably do to try to get it back home before it all falls apart. Really gets the adrenaline going. Had that happen more times than I care on the various shitboxes i've had over the years.

[@goosenotmaverick1156]

Hey a fellow shitboxer with high optimism haha I once lost an alternator on my way to work. I was driving down the highway at 70mph when my radio quit, then my tachometer, then my speedometer. I shut everything off and drove quickly but gingerly and made it literally barely in the driveway at work when it finally ran low on voltage and shut off 😂 Luckily I was able to order an alternator and replace it right at work on my lunch, and drive home. Shitbox, the most fun and stress you'll ever know when it comes to vehicles 😂

[@Theonixco]

I had a similar thing happen on a interstate when one of the pulleys seize up and chew up a belt about 3 miles out from work one day. managed to not over heat and the battery had barely enough juice to coast into work.

[@reverse_engineered]

I drove 20 miles in the middle of winter to the nearest pizza place in my shitbox. Left it running, as you do at -20C/-4F. Came out to find the entire radiator spilled out on the ground. I made my way back home at 90kph / 55mph. That was a chilly ride with no heater. I managed to make it all the way home and there was no apparent damage to the engine. That little Datsun inline 4 took went through a ton of abuse and just wouldn't die.

[@Braxel_]

That is a odd design for the driven pulley, having a flat wall that the belt could get stuck into.

[@fredflintstone4715]

Jimbo done did piss off the gnomes, and now he's paying for it....

[@pipeliner731]

Hey man that was an awesome video!!! This is my favorite channel!Watching you limp the car back with the car back and finally having it quit takes me back to my teen age years and driving and Olds diesel on the back roads of Mississippi!!! Got in shape pretty fast with all the walking I did and no cell phones! lol. Have you considered a belt temp gauge? They make them for the belt driven CVT side by sides so you can get out of the throttle before you over heat the belt or if your tuning the cvt system it will help as well. Also how about putting a tach pickup on you driven pulley and then feed the engine rpm and the driven pulley rpm into an Arduino and have it set up to display the current pulley ratio as well, this way with the belt temp gauge incorperated you get an idea of your slippage that is occuring. It would also be cool if you could incorperate and belt tach to count the number of belt revolutions and tie that into your arduino and that way you could calculate ratio and slippage using all three sensors. Love the channel. Now I need to go put a turbo on my Kubota garden tractor and straight stack it out the hood! lol! Looking forward to your next video!

[@robertbetz2933]

Thanks for making my Sunday mornings the best thing to wake up to

[@albudrow5436]

glad to see the gnomes making a comeback

[@markrenfrow9873]

Gnomes with access to 3D printer could be a problem...

[@oplefirem]

Those are speed holes! They make the car go faster!

[@NeptuneSega]

You should start bringing an ebike on your tests so you don't have to walk back in case anything goes wrong

[@brandonm179]

This is robot cantina, Jimbo will bring a 160cc motorbike

[@StevenIngram]

Yeah, a little folding e-bike that fits int he trunk or the back seat (so you don't add any drag or have to bolt anything on). That could pull your fat right out of the fire. :)

[@goosenotmaverick1156]

My dad carries an electric scooter in his suburban because he likes to drive notoriously unreliable vehicles and never put gas in them 😂 the number of times he's used that scooter I couldn't tell ya, but it's comical cause he's 61 😂😂😂😂

[@goosenotmaverick1156]

​@@brandonm179wonder what happened to that little Honda he worked on a while back, did he say and I forgot? It might almost fit in the Frunk haha

[@HammerWrench]

Jimbo’s future video would be titled: “Can an e bike tow a broken Renault home?”

[@feetballoo]

I've been waiting all week for this ..... Addictive viewing .

[@TheGuyMullins]

Your series here is the best in this class since I started using KZbin nearly 18 years ago.

[@warhead_wolf]

Love when you show the process of making parts or tearing them apart. I'm glad this episode was full of that! Also never expected the gnomes to return!

[@donakahorse]

I know with my golf cart, if I don't buy genuine belts, they slip and get chewed up fast in the cvt clutch. I also increased spring pressure to deal with extra power from a rebuilt/built motor.

[@npsit1]

Interesing delve into the drive issues you've been experiencing. Good stuff to know when I do this to my cars. HA. No, I'll let you do that. I don't have an old Renault to use.

[@skozer22]

Thank you for another great video. Thank you for investing all of the time you do. I'm certain the time it takes to work on and test drive these vehicles while doing your best to film it in constantly changing conditions really adds up. And then all of the editing.. You guys really do a good job.

[@reverse_engineered]

I enjoyed the thorough diagnosis of the clutch issues. Even though it's another delay in getting to test the things we want to test, it's still a valuable lesson for all of us to see how these things work at a deeper level. Entertaining and informative as always Jimbo!

[@thomasknobbe4472]

No pressure,! You fabricate stuff, sometimes it works right away, sometimes it doesn't. And then you take it apart, learn more about how it works, and you fix it. And we learn, too. Looking forward to next week's adventure.

[@BurchellAtTheWharf]

16:16 a stiffer spring in the driven pulley will help along with some extra shims?

[@JoeBManco]

Watching you create and solve problems is a welcomed part of my Sundays.

[@johnfunk4313]

Just wanted to let you know that I appreciate what you're doing with this channel. While I probably won't be doing anything like what you're doing, I feel like I'm learning something along the way, and I am quite entertained by it all. Keep doing weird things!

[@twentyrothmans7308]

It warms my heart whenever you get that wee car out on the road.

[@ex-engineer6657]

Thanks for "letting" the gnomes back into the production. They were missed.

[@ReverendBow]

Great diagnosis. You know if you install a spacer on the driver pulley, between the sheeves, you can keep the CTV from going into Overdrive

[@fremenondesand3896]

those gnomes are gnarly dude.

[@richardbrowne3641]

Time for a snowmobile clutch.

[@LizzyB123]

Definitely thought the gnomes were printing...something else at first glance. It's been a weird day.

[@OutsideTheTargetDemographic]

I hear buckshot is pretty effective at removing those garden gnomes.... 😅

[@hanskarlsson525]

Thanks for the awesome videos! Appreciate the time, effort and consistency of your uploads! Greetings from Costa Rica!

[@mdsuave13]

Would love to see the dual carb setup comparisons. I know you'll get around to it.

[@robotcantina8957]

Coming soon!

[@stevenbusk539]

I can't see a pair of 28mm flat slide carbs making any performance improvement, as with a 36mm CV carb, I would say that the engine is more limited by the cylinder head breathing, valve sizes and cam profile along with maybe the compression ratio too. If it can't safely rev to well over 4500 rpm or more, then it'd be no use making it better breathing. I really think that the biggest performance gain would be to get rid of the CVT, and adapt the engine output shaft to take a thrust bearing and bell housing adapter plate. The weak link will be eliminated then and you could start playing with tuning or a supercharger etc.

[@PsRohrbaugh]

Fuel injection. Turbo. Nitrous. Keep going until the rods go from the inside to the outside! It'll make the gnomes happy 😂

[@shackwrrr]

there are multiple 1:10 taper to 1" shaft adapters out there. This would allow using a very affordable polaris primary. The secondaries are available in multiple shaft sizes. As a bonus the reduction is 3.83 vs your 2.5ish and the Polaris provides an overdrive ratio at the top. This would allow you leaving the car in 3rd or 4th all the time and zero shifting.

[@Dis-Emboweled]

The return of the Gnomes!!!

[@moptop85]

At least you gnome what the problem is

[@BMXrecords]

I had that EXACT problem with my driven pulley. The solution is to use larger rubber buttons, at least, that's how i fixed it. It also lowered my top speed from 60mph to 53mph, though. But once i made that change, the belt lasted for a year in all seasons, so that might help.

[@BMXrecords]

for the record, my vehicle was a lot smaller, weighed 450 with me in it, (yard kart converted to road kart)but i also had a pretty small rear sprocket on the axle, and it was a solid axle on vertical bearings.

[@roberthoffman4713]

Live and learn. The experience will help with future projects.

[@duncancremin1708]

As others have commented, it’s probably a bit much for that cvt. If there’s a bigger one, it might be less susceptible to self destruction, when mated to the awesome power of the two cylinder. Certainly, you seem to have already exceeded its capacity and if your quest for more power yields results, the repaired cvt will probably have a very short life.

[@Salmon_Rush_Die]

I'm relieved to see there is continuity across the shim.

[@MrTench8]

So when it comes to buying belts there is truth in the saying, "It's a jungle out there!"

[@SamwiseOutdoors]

It's been a week. I think the obvious answer is that the gnomes got Jimbo.

[@stephengreen3566]

Very entertaining. I wait eagerly every week for you videos. Thank you.

[@handlesRdumb]

Used to install stair lifts that rode on an aluminum rail, we used a mitre saw with a wood blade to cut them. Made a headline racket but it was the only way to cut them without burning the finish.

[@tahustvedt]

12:10 - face reveal. I should have had my garden gnomes quality assure my spacer design. :)

[@nodrug2]

Wow, lot's of problems, but very interesting, things get boring when they always work out, so this was really fun. See ya next week.

[@robertjames2031]

In smaller cvt's there's a bump stop washer so the belt will not travel that far out of one pulley and down into the other this makes a fixed traveling ratio on the CVT

[@robertjames2031]

It could be brass impregnated with a lubricant or as cheap as a PVC pipe. Using that kind of a helps dial in the CVT to stop it from the belt being over extended

[@Dwayne7834]

Good video and good you sorted out the problem. Thanks for sharing.

[@mightyfinejonboy]

love the gnome hands

[@mrjlarsen]

How I just look forward to see you video every Sunday when I get home from work 😂😊

[@hemibreath]

Hello ! I must say! Your video format spot on. The style and pre and post explanations are very good. Other channels are missing this ! Very enjoyable to watch and the “flow” is good. Just thought you should know. Oh ya the content is awesome to !! 👍👍👍😎

[@tiporari]

Ever had a metal plate spin and break your fingers? Use clamps Jimbo! Lol, hate to see you get hurt. -Mom 😂

[@tx5brent]

I found that just as interesting as the usual videos, you have good knowledge of those CVT drive systems.

[@Mikehawking-v5z]

The nylon gear brakes on the oil pump but in the wrap you need to hit it with a torch to make it stop being itching

[@eetack]

The sharp stuff from the wrap is fiberglass or Kevlar. It only gets worse the more heat cycles it goes through. Cover you skin in baby powder before handling. The powder will fill your pores, and help prevent the fibers from getting stuck in them. This works for any fiber based composite.

[@hattyfarbuckle]

Great to watch Jimbo sort these problems.

[@RPS2443]

The gnomes are BACK! 🎉 Oh, love the work on the car too, keep doing that.

[@volvo09]

I absolutely love your wacky builds

[@IstasPumaNevada]

Figuring out the problem is still progress (and you still made an interesting/entertaining video out of it).

[@zaheer4024]

Currently my fav. KZbin channel! The best

[@dennispage6331]

Those pesky gnomes!!! 😅😂

[@volvo09]

I love the one with the baseball bat 😂

[@frankr6702]

Really enjoy your channel. S3 E32 comment foreshadowed the Italian Belt issues…. Mama-Mia! Buona Fortuna!

[@rudyossanchez]

Robot cantina videos are the highlight of my weekend

[@DKAS1337]

So pleased to see the Gnomes are back!

[@denisivey1592]

Testing the continuity on the aluminum plate? Bwahahaha! Pure comedic gold.

[@joeyf504327]

I'm glad to see the gnomes are back again fighting for ownership of the shop

[@ThePaulv12]

Jimbo, since this car is unique then you can justifiably call any new record attained in this beast of death from hell, a new world record!! Move over Mopar winged Hemi cars.

[@Commander-McBragg]

I don’t trust those gnomes any more than an Italian Amazon Comet belt.

[@rjung_ch]

Happy to see the garden gnomes back! 👍💪✌

[@Vanessinha91Pucca]

I would love to see this guy doing what he do on a VW air cooled engine. His fuel injection and creativity in a real old car engine would be amazing

[@joshivy7792]

I can’t believe I haven’t thought of this yet but it is perfect for the channel do a rip from 0 to whatever you can get starting in first than in second and so on???? People will have a better understanding of the cvt