S3 E31 We tune the Keihin CVK carburetor to work on the 670 cc predator engine in the Renault R10
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- čas přidán 9. 09. 2024
- Season 3 Episode 31. Jimbo finishes tuning the Keihin 32 CVK carburetor on the 670 Predator powered Renault... and he encounters a new problem. Tune in and check it out!
Hi Ya folks! Beware of a GIVEAWAY SCAM. This channel is NOT doing a Giveaway and we are NOT asking for personal information. If you get a message asking for info, please ignore it.
Jimbo
The walls in our new studio are bare, if you want to send swag please send it to:
Robot Cantina
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finally my weekend is complete
Completely agree!
Right? Mine too!
I learn more on his channel 😊
Sunny Sunday evening in Oxford then this.. perfect 🥰
My favorite sunday ritual
Can't wait for the diesel powered insight. Retrofitting hillbilly engineering into modern classics is fantastic. Have a good week filled with successful steps in these projects that you so graciously bring us along for our viewing pleasure.
now time for break lights and head lights and blinkers would make for great 2 and from town car
Don't break the lights...nooo!
This comment--same!! Love the kubota-3 builds! Can’t wait to follow this one!
Would love to see how many times it could go back and forth without a refuel
You think a Honda insight is a "modern classic" i bet you still think joey "the big guy" Biden is all there mentally too huh?
I knew you were gonna stuff that Kubota in the Insight, it just makes perfect sense. Might end up with an actually good and practical car like that.
Yeah his numbers were getting near a stock VW Lupo
Growing up my dad was always in the garage working on and tuning different Harley's. As a result I've got a soft spot in my heart for the V-twin and hearing this thing purr is music to my eras.
I follow a lot of automotive channels but recently have "gotten tired" of the usual stuff. This channel is so refreshing to see. Love the weird
Absolutely agree! People seem to be converging on recipes. But Jimbo Cleeter Derek Steve Morris and the Binky boys can always be relied upon. Oh! And I do cars. He’s good too 😊
Check Float height, its the most important thing you can do before tuning anything on the carb (Besides the screws). Also be sure to note that you can adjust the needle position on the throttle for rich or lean for mid to low range rpms
Was just going to say that myself.👍
Yep. I see so many people who have issues and all it is is a float that is to low. Hanging idle, High idle, Backfiring through the carb when idling. etc
@@trxtech3010 Absolutely. Float height is the single most overlooked adjustment you can do to any machine. dudes will buy a brand new carb for top dollar instead of doing the research. I don't think thats their fault tho. Everyone just says "Just clean the carb". Lol, that fixes it maybe 50% of the time.
Never forget, a simple way to get a smaller jet if you can't buy one is to solder up your current jet and re-drill with a smaller drill. Works great and the brass/bronze of these jets takes solder beautifully.
Yes! The insight is getting the Kubota! That 500 lbs weight difference should net some amazing milage and acceleration
Crack 100 mpg?
@dennisyoung4631 I don't think it will be that high but I'm making an uneducated guess of around 90 mpg.
You could probably make a little 3D printed hood that clips onto the fuel/air ratio sensor, to block out reflections and somewhat improve visibility. I think you could even get it to spin under reasonable force so you can adjust it on the fly if you're say holding the box. Could also do black craft paper and tape, but I think it'd be trickier to make that stay on well and also not fall off under normal driving vibrations.
Use tpu or throw in a rubber gasket, makes for easier friction fit to orient stuff in a way that stays put, but can be moved
It's less reflections and more the shutter speed of the camera and low dynamic range due to the bright conditions mixing with PWM flickering on the sensor gauge, I think.
Instead of 3D printing a hood why not just make one from a piece of cardboard cut from a cereals box or a sheet of stiff card and a little duct tape?
Your videos inspired me to get my home built go-kart made from a 1960s Wheel Horse tractor and resume building it. It should be running in a week.
I was struggling with a real bummer of a mood that I couldn't shake, then this episode came up. Thanks Jimbo!
Glad to hear it!
Hang in there buddy. We all get into a funk at times. Hope you can shake it off. Nothing lasts forever
Hope you're doing better mate
Man, this channel is just all the things i want to do with cars. Putting bigger engines in things is pretty par for the course these days, seeing how little you can get away with is a way more fun engineering challenge.
❤ You earned a like for the donut alone.
Jimbo you never disappoint, no matter what my mood is i always smile and feel cheerful at the end of your videos thanks man!
I’m going to need to see a drag race between these two masterpieces 😊
Sometimes the tuning process feels like stepping on a rake but eventually you start to get the results you’re looking for.
Also I’m super excited about the diesel insight.
Man, you dropped this video at the perfect time again this week!!! May God bless your soul you mechanically advanced CZcams rockstar!!!
Love the work you do on so many levels. 🙏 Thx again..
Sunday morning is complete! I got a fresh coffee and am enjoying the weather.
Wow that sucks that you blew the CVT belt. Good thing they're ready and available at a moments notice. On that note, I can't wait to see that little Kubota pushing the Insight down the road. And maybe add a little propane injection in the future? 😉 Would be cool to see how it would react. Nice work Jimbo!! 💪🔥
Propane is just a fuel adder or fuel replacement. Doesn't do much except add additional fuel. But since it burns with zero visible smoke you can't tell if you are over fueling like you can with diesel. Only if you have an EGT sensor, which he does, or a wide band O2 which I'm not sure he installed it on the Kabota. Water/meth would be a better choice as it also provides additional cooling so he can turn it up even more and not go too high on EGT
Remember, "Lean of peak" (aka LOP) is also a tuning method available for air cooled cruising. Toss the EGT gauge on it, and you'll see as you go lean of 14.7:1 EGTs will initially go up, but come back down. Between 16.2:1 and 19:1 is where you should find cool lean running and maximize economy. *but* it should also be noted that lean mixes burn slower, so you'll need more advance to counter that.
Spot on this tuning makes a vapor carb😅
The ratios that you have stated are pretty lean even for cruise, I'm not sure that the combustion chamber shape and ignition system will be good enough to cope with those ratios. Having said that there is no harm in trying, in fact you can just go leaner and leaner on the cruise setup until it is very obvious when driving the car that you have gone too lean, you then just go one stage richer and that's that as far as the cruise AFR is concerned. The ratio just ends up being what it is for that engine with its current setup. Of course if you then go and stick an MSD ignition system on it you might be able to lean off the mixture some more!
This technique is sometimes used in air-cooled aircraft piston engines which.
- The mixture distribution between cylinders needs to be very good or at best the engine runs rough, at worst you damage the engine.
- The ignition system needs to be up to the job.
You can't just hop in a Cessna 152, turn the mixture out to lean of peak, and fly off into the wild blue yonder. You'd be doing it in a fuel injected airplane with CHT or EGT readings for each cylinder.
@@sidecarbod1441 A hot air intake would help also.
Now I'm reallt stoked for the Kubuta Insight. It just makes too much sense!
YES
I love anything with a diesel and here in the US they just aren't well received for some reason. I love them.
The VW and Mercedes diesels have a cult following here in the US.
Well, seems we finally have a name for the Renault project!
Another great video. I'm looking forward to seeing the Kubota diesel engine in the Honda Insight. Thanks for sharing 👍.
The way this thing sounds is just 10/10. It sounds SO good.
I love these experiments. The automotive industry should watch this. Learning from other people is what makes progress!
Exploring new ides is what progress is. Copying others is not progress.
@@scootergeorge7089 I did write “learning”. Not copying…
@@martinneumann7783 - Learning from others is not progress unless the "student" takes that knowledge and advances it further. Otherwise, it's copying.
@@scootergeorge7089 OK.
I _think_ the first-gen Insight might also share the speakers from the S2000. Not certain though.
Fun fact: The first-gen Insight's combustion is so finely tuned that the spark plugs need to be turned (indexed?) the right way for optimum engine function. So there are FOUR spark plug variants (A, B, C, D) available for its 3-cylinder engine, and they stamp which plug each cylinder uses on the head. (Mine takes three B's, which I've read is typical.)
That's the sort of stuff that makes me appreciate Honda engineering... although I still like to make fun of them.
I wonder if that dip in AFR is engineered into the carb to act as an accelerator pump.
My goodness does this channel have me excited for the weekend lol
One of the few channels that get better, and better.
Thanks Jimbo.
Hi Robot Cantina, I have Kawasaki KLR650 with a CVK40, common mods for this carb/bike are larger jets, KLX Needle, also there is a mod to drill the slide vent to 7/64ths to quicken the slide opening, this may fix your richness in the lower rpm. The CVK 40 has a bunch of aftermarket support since Kawasaki and Harley Davidson used these carbs in their bikes. Might be a nice upgrade too. if you need one LMK I have a stock spare for free99.
The 32 mm carb we are using is an oddball and not a lot of parts are available. We have a 36mm CVK carb standing by that we want to test next. If the 36 mm improves performance over the 32 then we may try a 40.
As a french guy i more than enjoy what you doing whit that little Renault. It's a rare car even in France...
Alright, I didn't get to watch 8n the morning, but this is probably my favorite video so far. Love the donuts, and the new insight, I can't wait to see more!
Still sounding good! And now you can say that it really shreds.
Always looking forward to sunday morning for another video, i love the lighthearted experimental nature of your projects. It really shows that this is all just for fun. Can't wait to see the diesel insight!
Great show❤
@@Csharpflat5 did you reach out on telegram? I did and I don't think it's Jimbo. I'm pretty sure it's a scam.
Oh Magoo, you've done it again!
Jim Backus was my favorite in It's a Mad, Mad, Mad, Mad World, a great movie for old Mopars.
Classic
Such a calming voice and easy to understand as a german. Nice project, can‘t wait to move on with my own project after watching this Video.
Thanks for the help jimbo ❤ But I have seen some water cooled engines run at 10:1 afr.
You can’t win for losing. Can’t wait to see the insight again.
Yessss, give in, forgo the CVT, put a motorcycle chain and sprockets on there instead of the pulleys.
It still trips me out that a little rubber fanbelt is all it takes to move an entire car. And even do donuts!
True altho they are reinforced with steel belts on the inside.
I have actually owned a car with cvt (variomatic). It was a Volvo 340 from 1985, 1.4L inline4, 67hp. As a young guy i hooned that thing around , also doing donuts and snowdrifting. That car had 2(!) drive belts, each about 60mm wide. Because of all my hooning i had to tighten up those belts each 5000km. Crazy but i had a lot of fun with that car and i never broke a belt.
@@jfv65 Remjohan :P
G'day mate great vid as always I still think adding runner length between the carb and the boot attached to the billet block even an extra inch will help low down torque production maybe add a 90 degree Elbow between the carb and the billet block for ease of installation. Would be an easy test to just keep adding runner length to see if it helps overall acceleration. Thumbs up mate
Good tip! In the next video we are going to add a 3D printed extension to the induction system. This 3d printed part is something one of the viewers designed. it should be an interesting test.
Ahhhh… thank you Jimbo for another wonderful episode!!!!!👍😸
Those gauze air filters are only effective if oiled. The oil is the actual filter. The gauze is a labyrinth that forces the dirt to make hard turns and hopefully get stuck on the oily strands.
And if you go heavy on the oil it'll cause the engine to run a touch rich for a while. As for the carb, I had a vn750 that used twin Keihins, they take a fair bit of fiddling to tune properly. And that's on a factory setup, no wide band, I tuned by the sparkplugs.
YESSSSSS....
ROBOT CANTINA ....
my morning just got better...
And we start with a power slide!!🤘
"Oh Robot Cantina, you've done it again..."
I’ve been thinking about Jimbo’s backyard as a nice place to have some fun… seems like we share the very same thought! You broke the car but you had great fun, 200% worth it!
Another great episode. Love the Renault, they were great in Rally in the past, so your donuts were appropriate!
But I do live the little Honda, can't wait for more on that car as well.
Thanks Jimbo!
Cheers, Robert
I went through this business with the CV carburetors when I hopped up my Honda CM 450T.
My solution was to leave it all standard and only change the needle. I did not have a ready supply of blank needles to modify but I found that they were the same as a small box nail, and so I purchased some at the local hardware store and started turning them down. What worked for me to get a punch off the line and smooth acceleration was a very blunt needle. This keeps the emulsion tube out of play a little longer. I found it playing with the diaphragm Springs did not help at all. Mind you, that in those days I was not working with a wide band sensor. I had the narrow band eardrum sensor and the wide band butt sensor, going.
Tuning by ear is probably the best way to get these little engine to run right. The wide band certainly helps but trying to fix all the little bumps in the fuel curve by using the gauge will drive a person insane.
Worthwhile keeping a spare belt for those cvts. The circle work in the yard was epic
I don't recall if I mentioned it on the last vid or was just thinking about it, but quite a long time ago I assisted a local hot rodding team fine tune their mechanical fuel injection system on a project car, and they operate almost exactly like old performance bike carbs in that they work great at WOT (and almost exclusively will not function well anywhere else!) as they were more or less made for racing applications where off-gas maneuvers are short blips; I believe the really early systems were adopted from hulking airplane V12s that chugged fuel even at partial throttle. The mention of the Keihin carb made me think that some kind of hybrid system between it and the mechanical system would have been fantastic for getting some kind of usable street performance; getting them to idle correctly even at pit lane speed was a nightmare as you'd basically have to bump the throttle with the clutch in to keep the engine going. Ha, glutton for punishment memory lane!
Add: Ah, I remember where I was going with that now. If the Renault has a fuel door on the right side, that'd be a great spot to shoehorn in a NACA duct for feeding air to the engine filter if you don't mind taking a cutting wheel to the old fill port. They make everything look cool anyway but are wonderfully effective aero aids in both scooping (and run backwards, removing!) air to/from your desired location from inducing a low pressure entry/relief area. I have several of different sizes that one day I'll get the courage to chop up my hood or right at the front fender for a pseudo ram air to graft on my daily ride.
V8 swapped in just to film the into...
Good job, Jimbo!!
Yep, we swapped an LS2 in it just for the intro.... try to keep that a secret...
I have been working on bikes since I was a preteen and my father thought if I rode a dirt bike I should be able to work on it. He taught me everything I needed to know back then. I have been building bikes since I was in my early 20s (Now 57) and racing and tuning carborated, and FI bikes since 2000. With that said the needle valve on the CVK (As well as the VM and tm) controls off idle throttle, piolet jet off idle to about 1/2 throttle, main jet 3/4 throttle to WOT. The way I would have fixed your problem would have been to raise the snap ring on the needle valve 1 or 2 groves. leaning out off throttle, and going up 3 jet sizes on the main (2 1/2 numbers per size) as I seen in other comments check the float level.
Excited to see the insight back in a video. Cant wait to see the performance of both projects.
The intro was perfect. 😄
Lol. Your donuts in the gravel reminded me of my 5 speed 84 Celica GTS coupe. I used to love to take it out on wide gravel backroads and play rally driver (in the mid 90s when we still had gravel roads here in East Tennessee). Unfortunately I also had the experience of leaving parts behind on the highway afterwards- but mine was actual metal bits. I blew a hole in the side of the 22RE block, and it still ran. Not many people can blow up a 22RE. It takes skill! I put another 22RE in it and drove it for another 100k miles fwiw. I think the previous engine's timing chain jumped off. I already had a new timing chain kit but hadn't done it yet. Oops. I miss that car... it was made to be worked on. Everything was easy to take apart, fix, put back together. No stupid plastic clips that break. I should never have sold that car.
I love these videos! The cars, the data, the diagrams, the tests.....
Yesss! Diesel Insight!
Great intuition and superlative knowledge added to meticulous patience. You are the man.
Your theme music is a real treat.
Mr Magoo you've done it again!
I like your sleepy little town. 👍
I do too
The first thing that I thought was the belt when you lost your speed. Good video Thanks for sharing such interesting videos 👍
YES! Diesel insight! Love the channel!
Fuck i love this series. In no little part to the awesome presentation and narration from Jimbo.
If anyone is interested, the SA publication Super Tuning and Modifying Carter Carburetors - Dave Emanuel is a hoot of a read. Forget the book is about Carter carbs. It first takes the reader on a journey into carb principals from basic to advanced and uses Carter carbs to show the concepts in pictures. Then it applies specifics to tuning them - that's the Super Tuning part.
It shows the inverse relationship between manifold vacuum and Venturi vacuum and how and why carbs are load sensing.
It also explains emulsion tube concepts and how they pertain to idle mixture circuits.
Strictly speaking this may or may not apply to a $30 Keihin 32 CVK rip off but it might.
It is often the case the idle mixture screw is not actually an idle mixture screw per-se. Thing is, the fuel in the idle circuit is pre aerated by the emulsion tube and the emulsion tube's size varies the ratio of pre aeration in the idle mixture circuit.
What the idle mixture screw actually does, is basically act as nothing more than a tap for pre aerated fuel.
This means you're adjusting the volume of premixed air and fuel in the mixture circuit. It then follows that you can't do with volume of fixed ratio pre aerated fuel what you need to do with a different ratio of pre aerated fuel.
It seems like a mute point however, this has consequences when you factor in throttle stop screw position of the butterfly - the air leak it induces a) directly reducing the signal in the idle mixture circuit and the transition between idle and main metering circuit and b) diluting the the premixed idle circuit fuel. There must be an overlap of the two circuits to avoid stumbles/flatspots etc.
I'm already excited for the next video, and to see the Honda project take shape.
No matter how low power this Renault makes. It sounds awesome!
Do you get many looks with this sound?
The car gets a lot of looks, not sure if its the sound or just the way the car looks...
Congratulations on your best video yet, Jimbo! So packed full of fun and drama! It was great to see the Insight again and the excitement of your breakdown odyssey added spice. The doughnuts was a fun start too! You’re excelling yourself 😁
Your videos always make me smile ☺ .. thanks Jimbo !
Got me with the BIG BLOCC again😂
100+ mpg Kubota diesel insights I'm excited to see the progress this project makes
I can sympathize with the issues of getting parts from a "rural" area. I live in central FLA, and getting parts for my MG can be frustrating at best, since I always seem to need parts now, not in a week. Glad to see the Honda making a return, should be fun.
a couple things to consider, shortening the slide diaphragm spring can cause the slide to lift too early which will also cause the fuel through the main jet to flow too early. for future reference when testing or trouble shooting rather than making a permanent non-reversible change by cutting the diaphragm springs, I either use small zip ties or thin stainless wire to temporarily shorten the spring that way i can try different lengths to find the optimal length. it is also possible that raising the slide needle is contributing to your off idle rich condition. because there is no direct link between the throttle and the slide CV carbs can be a real pain in the ass, with a cv carb the wrong float height can cause a lean or rich condition, but so can the wrong fuel jets, the wrong needle position, the wrong bypass jets, and on and on the best of all is like you made reference to in your video, all the reference charts refer to throttle position, 1/8, 1/4, 1/2, full throttle, ect. but there's nothing that relates to real world street application like cruising down the freeway at 80 mph and 6k rpm but where the actual sustain throttle position is less then a 1/4 throttle, like i said, cv carbs are a pain.......
Better than any TV show on now
Yesss! I always thought the diesel in the Insight would be a great combo. Looking forward to seeing that series.
The red Saturn was a loyal test mule, the most honorable way to spend it's final miles.
The Renault is such a great looking little car as is, patina and all. Simple chassis for modern small engine swaps. Hope it stays around long term too!
Two great projects there. The diesel in the Honda Insight would benefit from a few modifications learnt from its take one in the Saturn. Exhaust, turbo and intercooler mods especially.
I think the Renault is only going to see success and perform to its full capability once it gets engineered to mate the Predator lump direct to the clutch and gearbox. All Jim needs then is a third car and someone to donate or help him find a nice 3/4 cylinder two stroke outboard/jet ski powerhead to do a two stroke project car. He'll have all bases covered then!👍
Sweet! I was hoping the diesel would find it's way into the insight :)
Great thanks for this tiny week end candys
Really excited to see the Insight back! My favourite of all the cars you've done.
Whoohooh! More renalt content! I love watching this series, can't wait to see what you add in the future to make it even more of a racing car. (If you're still going to)
Great job as always!
I always thumbs up your videos, but today you earned it with that motorcycle carburetor demonstration. See you on the next one.
The donut 😂 perfect
It sounds awesome with the new carb. Fun stuff.
Cant wait for the insight.
I almost commented on the air filter thing, but then I figured (correctly) that Jimbo was just trolling his viewers again 😂
Its true I do troll, but in the last video I completely forgot to include video of the air filter... and it truly looks like we weren't running a filter in the previous video
Hi Jimbo.
If you invert the electron flow in the flux capacitor and use quality plutonium in the power generation unit, you should achieve at least an extra ten parsecs per time unit.
Love your work 👍
I waited since the beginning of the renault project for an intro like that... Keep it going, love your series
A sequel to the Italian Job called the Kansas Job, but with Renaults.
Always great videos!
Tuning carbs with metering rods, we used to take a ignition points file a make a small flat on the taper gradually fattening up the mixture. 6:50
Excited for the new iteration of the Insight
So excited about the insight/Kubota project.
Another great video! Thanks for all of the insight into how the carburetor works and the results you got while testing it out. Shame about that drive belt! Hopefully you'll be able to get a proper replacement soon. What a great surprise to see the Insight coming back! I can't wait to see the diesel in there. I'm also very intrigued to see the electronic control of the fuel rack. I'm curious what aspects you will be monitoring and how you will change the mixture in response. Until next time!
Another fun episode. Poor little Renault doing donuts in the yard. That'll show for for acting like a teenager. Can't wait to see how it acts when fully in shape and tuned more. Keep up the fun Jimbo!
I wouldnt lose any sleep over the rich condition when the carb transitions from pilot jet to main jet........that is actually good for having good throttle response and pick up from idle when you want the vehicle to take off from a standing start etc but doesnt have a any real impact on fuel efficiency once the rpm picks up for normal driving. The main issue was overcoming the lean condition on the main jet.
The diagram may be somewhat hard to interpret. the rich condition happens at part throttle while cruising. So at 50 MPH at part throttle while cruising the AFR is not ideal. The good news is for acceleration this rich condition is only a momentary blip and is helpful on the low end.
So excited about the Honda ! ❤ man I love this channel
I have used lead shot to block jets and air bleeds off to redrill them for testing.
I think I may have some insight into that dip in air fuel ratio. A similar problem happens with Chinese 50cc carbs. Check the accelerator pump. On 50cc CV carbs the accelerator pump is unecessary with a proper carb tune and simply dumps quite a bit of gas every time the throttle is opened from the closed position. I've gone from 85 mpg in the city on my Chinese 50cc all the way up to about 110 mpg simply disabling the accelerator pump. It also helps prevent oil dilution which is a known problem with these bikes but no one has enough old school carb tuning knowledge to figure out that the extra fuel making it into the oil is from the accelerator pump.
This is why no matter how lean a pilot you're still getting the dip. Check the accelerator pump circuit, possibly see if disabling it helps as this will make the CV carb purely vacuum metered.