S3 E32 We install a 3D printed manifold spacer on the 670 cc Predator Renault for moor speed

[@13OilfieldTrash]

The most exciting 0-55 on KZbin!!

[@goosenotmaverick1156]

0-60... maybe.... 😂

[@austinshearer160]

Absolutely

[@claysonwebster1622]

😅😅😅

[@Clearanceman2]

I agree with trying the larger single carb before trying dual carbs. Now's the time to do it and it might be the best overall solution, who knows? Unless someone previously tried all this.

[@alttabby3633]

I enjoy the steady progression and agree with you. Let's stick with the single but larger carb before going full hot rod dual carb. If you don't eat your meat, you can't have any pudding!

[@MrThunderCunt]

Cars and cameras has a hopped up 670 on theyre drag rail. They have used dual carbs but it did require modifications to the cooling shroud. Id suggest 2 24mm mikuni carbs.

[@jacebongsbaker]

I agree next 1 big carb

[@althejazzman]

If Jimbo doesn't upgrade to the bigger single carb now, he'll probably never go back to it after doing all the work to setup the dual carbs.

[@billjacobs8035]

Agreed 👍

[@SamwiseOutdoors]

I'm voting for the larger single carb first. It's just a little more fun seeing parts that aren't made for this engine end up on it.

[@gingernutpreacher]

Agreed

[@9233tv]

Single carb first. I’m enjoying this series way more than I thought I would. I could feel each “shift” on the 1-2-3 run. Ah, nostalgia. If I knew then, what I know now, I would’ve kept Oma’s car. 😢

[@twoeightythreez]

Its too bad the CVT makes power shifting impossible, it would likelu shave at least a full second off the acceleration times.

[@Eduardo_Espinoza]

"Granny shifting like you should!" lol @twoeightythreez

[@reidster87]

I really enjoyed the 3rd person town driving shots like the one that shows the car from the side, coming to a stop and accelerating at the intersection. Nice addition!

[@robotcantina8957]

Thanks, it was something new I wanted to try.

[@fil1329]

Another angle or perception doesn't hurt Looks good for an older car It will turn heads for sure

[@TheNewBorkTimes]

My vote’s for single big carb next! If I’m not mistaken , you mentioned CVT/transmission upgrades earlier in the video. Now that’s interesting. Getting the power (what little you do have!) down effectively makes the most sense to me, but who am I anyways. Keep up the good work Jimbo!

[@BeardedFrog]

Agreed on the transmission upgrades. He's losing over a second with every shift, and starting in third gear is both hard on the trans, and slowing it down significantly by default (when you take the slow shifting out of the equation). The trans is gonna have to be addressed at some point or it's always going to be the biggest hurdle.

[@Ultimatebubs]

My vote is for dual carb. It sounds like the folks at 670 performance already figured out your next engine upgrade for you!

[@garthbutton699]

Count me in on the dual carbs!

[@greggc8088]

Me too!@@garthbutton699

[@CommodoreFan64]

I also vote for dual carbs, no need to mess around with another single carb video wasting time.

[@pixels2polygonss]

I agree !! It’s been proven that the single carb system doesn’t distribute fuel equally to both cylinders on these 670. Plus I think that’s why you’re getting your lean rich reading

[@JessePlays3434]

I bump this!

[@curtislavoie2242]

Those foam filters actually work vs the K&N style which let anything smaller than a bird into the engine. Project Farm has an air filter test that I found quite eye opening.

[@rearspeaker6364]

anything that resembles a k&n filter on ebay will wipe out a motor!!

[@jasonz7788]

Thank you for entertaining the masses Jimbo! Ur work rock's

[@4saken404]

This channel is like the good old days when Jon Stewart said: "And now here it is -- your moment of Zen."

[@90FF1]

Single carb, then dual. Maintain the process. I keep watching the 0-30 numbers for a realistic city application. Thanks for one of the best Sunday morning shows on YT.

[@JohnSmith-pl2bk]

How about single carb...dual throats (secondary opens up when vacuum operated)... like the carb fitted to a Datsun B210 from the 1970's?

[@HockeyPop29]

I'd do the single carb first, then the dual carbs with those red beer koozie foam filters. Prob won't be quite as beautiful as my old '68 firebird 400 tri-power setup, but its mpg will be far better!😊 This is a great series! Gotta get sime more white cheddar popcirn for next wee!

[@dannycalley7777]

HP ...............anb won't sound as good under WOT ?????.............had a friend with 66 GTO tri power

[@JerryR390]

36 carb, then the dual setup. Excellent content will watch all episodes on this series.

[@volvo09]

I think you should try the other single carb before you go to the duals.... less mounting work.

[@garthbutton699]

Awe come on go for broke

[@SFearox]

This is the way.

[@rearspeaker6364]

@@garthbutton699 Turbo!

[@joonasll]

My vote is test the bigger carb and after that the dual carbs 😅

[@joeolivas4941]

After 2 carbs 2 turbos!

[@joonasll]

@@joeolivas4941 or one turbo and one supercharger

[@iceman45ification1]

I definitely think you should start with the 36mm carb before going to the dual carb setup, just for the sake of comparisons. The printed spacer really helped in straitening the air flow to the ports on the manifold, thus adding some performance gains. The dual carb setup would probably be ideal for power, but would take time to tuning them properly. It's cool to see how far you've come with this. I'm anxiously waiting for next week. Nice work Jimbo!! 💪🔥

[@pancudowny]

As a driver who's well-familiar with driving stick, I can tell you: You need to work on your technique. Try not lifting so much off the throttle when you shift, and get your shift/throttle efforts synced better so that you're shifting just before you're "lifting". That way, the engine will stay more in the "sweet spot" RPM band, so you won't lose as much power under acceleration.

[@robotcantina8957]

I have driven manual transmission cars all my life, it's my preferred transmission. Keep in mind there is no conventional clutch on this setup. So when I shift I'm shifting without a clutch. I have driven many cars like this, but on this Renault gearbox the synchronizes are a bit worn.

[@nodrug2]

Another fun Sunday morning, always look forward to the videos and this one made the mark. I want to see the mule marbs but the path through the larger single is the most logical and informative so I go with that.. So there's my vote. Whatever happens will be a blast. We'll see next time.

[@virtualizeeverything]

I am glad to see that the country is still alive somewhere it is dining fast here in central Maine

[@tahustvedt]

Fantastic video! That was more exciting for me than I thought it would be. I was very curious to see if the improved airflow of the fillets would help. I designed it when you used the original carb so I thought the added length and fillet would help mixing and flow, but it seem to fit great with this carb as well.

[@alttabby3633]

Great work Grumpy RC! You should publish a design/build video about the production, I love a good cross channel tie in. Curious to know what filament you used? ASA or ABS I would assume.

[@snowdog993]

Finish the single carb tests since you have it mostly dialed in Jim. Once done, then work with the duals. As tempting as it is, I have the feeling that you're on the right track with Venturi.

[@PaulThomas-qo9vy]

Great show Jimbo! The single carb with the tunnel ram was really good & simpler that 2 carbs! Too bad the low speed jet was not responsive. Love your experimental spirit. Blessings, Paul from S. Central Tx.

[@worldwideguitarman]

Single carb is way less hassle to dial in than dual carbs. I want to see both, but I think trying the single carb first just makes more sense. More of a linear progression. I have been enjoying all of your videos since I happened upon your channel a couple months ago. Thanks for entertaining us!

[@johncrawford6571]

Wow! I stumbled across this channel by accident and wasn't really that interested until the Renault adventure. Now I am hooked! Try the larger single carb first and let's see how we do. I would also like to see the dual carbs later on. Anyway, you captured another person in your audience! Watching to see what happens next. . . . 😊

[@howlinhairyontheprairie8261]

Go with the bigger single first. Simplest swap. I want to see the dual carbs also. I look forward to these videos. Good job.

[@stoneybologna__]

There is a group of 3 people who build performance engines call carsandcameras and they have been able to make a single carburetor work with a modified intake manifold. The biggest setback of the single carb is that they noticed one side of the engine getting more fuel than the other and it would foul out the spark plugs. I would say a good test of single vs dual carbs would be to make variable intake runners (if we have the tools to do so) that way the air to fuel ratio is even between both cylinders. It would be awesome to see your way of do this and testing results since you are the diy person who shows anyone can do this without intensive knowledge and tools. Truly a trial and error, and I admire that.

[@JoshTolbertUrbana]

1) Single 36mm carb 2) Dual carb 3) Since you've already added the O2 sensors, single EFI throttle body 4) Dual-throttle-body EFI! Seems like a natural progression to me! :D Love the series.

[@mski907]

Happy to see continuous experiments going on! Thanks for continuing to post. I like these videos and watch them when they come out almost every time!

[@Paulster2]

My suggestion is to go with the larger single carb first. You already have it, so why not (Yes, I'm trying to keep with the theme of the channel!) After that, try the dual carb. I think you're going to find, once they are dialed in, the twin carb setup will really help with performance. The reason being is, when the air comes through the single carb, it has to change direction four times by the time it gets into the cylinder (90° at the aluminum manifold; 90° just after the 3d printed manifold; 90° turning to head for the cylinders; 90° turning through the head and into the cylinder). When you have the dual carbs, you're eliminating three of those turns. If the engine is intake restricted, this is going to help big time (but you already knew that).

[@thesylvanshadow4223]

The 36mm carb first. The 32mm is big enough for a 420cc up to about 5000 RPM or so(for ideal top end flow), and 33-34 mm is what’s recommended for most 420cc class performance engines. I would imagine that the 32mm is holding your motor back a little bit on the top end. Would be nice to see the 36 mm next, so that we could have a back to back comparison of a smaller carb to a much larger carb, and then we can do the twin carbs. Keep it up Jimbo, the content you make truly cannot be found anywhere else on KZbin or probably on the Internet for that matter. Thanks for all your time and hard work.

[@banjerpicker5273]

Yay. Sunday funday!

[@wok-sy6dd]

Yaay indeed

[@waltwalton8106]

Thanks!

[@robotcantina8957]

Thank you so much!

[@williameadogg6659]

I truly enjoyed seeing your videos and wait to see your next video

[@reypolice5231]

Still funny watching you do all this stuff. Never boring. Thanks for the update 😃

[@peterbrown6224]

You're so cheerful, like Mustie. It makes my day. Thank you.

[@rjung_ch]

Hey Jimbo, I'd do the single carb first, but know the dual ones would come after that. Had a ton of fun! Thanks! 👍💪✌

[@ronniedale6040]

Dual carb here. Once tuned it will not only run better but be more responsive and idle smoother because you eliminate the charge robbing effect the leading cylinder tends to do to the trailing with a shared plenum induction.

[@rowdyhoundsman]

I’m always looking forward to seeing your new videos. I’m sitting on my front porch drinking coffee and watching the morning happen while watching this.

[@TheJdizzle02]

My vote is BOTH. For science-based testing

[@AutoCrete]

Holy cow! Knocking a full second off the 0 to 55 time is awesome. Time for some more safety equipment... like a neck brace. I can only imagine the strain.

[@robotcantina8957]

LOL We may also install wheelie bars.

[@rjechols2059]

Me as soon as Robot Cantina uploads 🏃🏻 💨

[@dougt7762]

Single carb first gets my vote as well. Thanks for all of the great entertainment too!

[@DirtyLomax]

Best looking and sounding experiment you've done so far!

[@StevenIngram]

I kind of like this set up. It seems to have "continuously variable" as its theme. The CVT on the engine and the continuously variable venturi in the carb. I guess if you move on to a new car, finding something that has a CVT may be interesting. Then you could have CVT to CVT power delivery with CV venturi. :D Continuously variable all the way down. LOL

[@rearspeaker6364]

cv carbs are too complex, just put fuel injection.

[@digitalchaos1980]

Been a while since I commented, but I still haven't missed any shows! LOVE seeing the results you get with these experiments! Between you and Garage54, yall surely satisfy my curiosities with vehicles and experiments lol. Keep up the awesome work! 😎✌

[@williamhevey8913]

Whatever you do, just keep doing it. Obviously we all love it

[@bakupcpu]

Anyone else just want to buy one of those and drive them to work everyday? Another great video to compliment my Sunday breakfast!! Cheers!!!

[@carlbeaver7112]

It sounds as if your 'CVT' is dropping the engine rpm too far down during mid-range acceleration. When first taking off it sounds to be loading the engine reasonably close to as good as it could. However, 1 - 3 seconds later you can hear the engine speed dropping too far due to the CVT ratio reducing too much/too fast. I'm thinking this results in the engine leaving its optimal power band. Maybe some sort of slotted washer(s) to shim the CVT spring, that wouldn't require dismantling the unit, could provide a quick adjustment method.

[@herbertgearing1702]

This may be the most fun anyone ever had with a Renault and a lawn mower engine.

[@RedNoise-hz5nh]

if anything it sounds incredible!

[@shadymaint1]

Sunday morning coffee and Robot Cantina, my day is complete.

[@ibast1]

re the low-mid throttle: these things have an idle mixture screw and an idle jet. The idle jet effects the range you were talking about. the screw just does idle and effects what happens when you snap the throttle open or closed. Also you can get down draft (or semi-down draft) motorcycle carbs. typical found on Japanese v-twins. these might suit your setup more.

[@callhoonrepublican]

I'd like to see what the larger carb does next. I really like this series!

[@GeorgeGeorgalis]

Great project! Those CV transmissions are amazing. A higher ratio in the differential might make better use of your four speed, but probably not worth the effort? When I was driving a 1000cc 3-cylinder geo metro, I got noticeable improvement in mileage and performance when I over inflated the tires. They wore faster, but only cost $25 each at the time, so it was worth it. Caveat emptor!

[@deatheragefarms]

Another vote for the bigger single carb before pulling the manifold for the dual carbs. I'm really enjoying this series, thanks!

[@2alawabidingcitzen]

Literally been waiting all day to be able to relax and watch this episode. Been working since 7am thanks jimbo for giving me something to rush home to. 18:26 I say turbo next 😆

[@Hewitt_himself]

test the 36 before you remove intake to swap to twin carbs, removes testing variation

[@robertgillin]

id like to see the duel carbs then single cv turbo suck through

[@waltwalton8106]

I want to see both options. I guess if I had to vote it would be "Moor Carbs" at least one moor. I think the less than ideal standards of the knockoff will be a pain to get fine tuned and those DUAL CARBs are worth tinkering with. Either way it makes my day to watch the build.

[@gregmoyers7757]

All around performance, ONE CARB! Racing when ONLY wide open matters, a carb for each cylinder.

[@haydenc2742]

ooh...do both! Also...go crazy and have a super tall (like 2x-3x as tall) manifold spacer and see if it helps with the torque Loving it..tons of work but very cool results! Keep em coming!!!!

[@LouisWritingSomethingCrazy]

I say go dual! This Renault has been your best series yet

[@rydplrs71]

I’d just vacuum match the carbs and rely on a single wideband sensor for targeting.

[@cppctek]

These videos are so good. Thanks for all the work you do. I think you will see s gain in performance with a dual carb setup actually and it’s worth doin. I had bad luck with the knock off carbs and the engines sometimes had power issues also.

[@Stevemax07]

I vote for the single. we can get to the dual if we think the results are not good!

[@stuffandjunkandthings364]

larger single first. The "tunnel ram" has shown an improvement, need to see what effect an increase in airflow will have on performance prior to changing runner length (the twin carb setup will have shorter runners) as well as carb size. I have no doubt that the dual carb setup will make more power at the top of the RPM band, but I think testing the "best case scenario" (larger carb with tunnel ram spacer) single vs dual will make for an interesting test- I don't own a 670cc V-twin Renault to go find out myself, so I'm counting on you, Jimbo.

[@ccscomments757]

My Sunday is now complete. Get up and watch Robot Cantina. I'm anxious to see the results of the dual carbs, but I think it will all be incomplete if you didn't try the larger single carb first.

[@johnlease2369]

Definitely want to see dual carbs,but lets progress with single carb 1st. I have a 420cc in my 1996 ford aspire a am very interested in your results of course for my benefit so i cant skip some of the trial and error. Great info and entertainment.

[@SchoolforHackers]

I’d love to see that on your channel!

[@robertvitrano3757]

I like all of your projects but this one is the coolest IMHO. You could actually use this little car for a runabout going back and forth to town. I dig it😎😎😎👍👍👍

[@ogland6482]

Both!!! Single carb first then dual!!

[@blackbuttecruizr]

Outstanding! Dual carbs get my vote, for what it's worth.

[@TSRGarage]

Single carb .. then dual carbs. Best show on the internet 👏

[@curtisroberts9137]

SInce you are set up for a single carb right now, try the 36, although I think it will be too big. At least you will know at that point and can try the duels. Then you wont have to worry about going backwards with the setup to try the 36mm later.

[@fixyourautomobile]

You could use a single wideband controller, and two o2 sensors. As long as they both had a heating circuit you could switch between the two signal sources on the fly for each bank. One would THINK. Correct me if I'm wrong.

[@myrmeko]

Could you try next time to do a no-lift-shift? Maybe it doesn't break the CVT. And could you also try to slam through the gears faster?

[@X7rocks]

Uni filters work very well. I love using pwk style carbs for my engines. Easy to tune with an afr gauge and give me the best throttle response.

[@jeffreyvanengen]

first bigger single carb and after that the dual carbs, love the content!

[@TrilogyBPM]

I can't believe another car was actually present on the high speed testing grounds 😂 another excellent video Jimbo!

[@dannycalley7777]

T ................pretty soon the town will be lining the strip ............with stop watches in hand ????

[@joesmoth2610]

You sir are at the for front of a revolution,as the government pushes electric cars more and more people will do this as a option to keep vehicles going

[@joshuagibson2520]

TrackTribe is awesome and often overlooked \ under rated. I recognize them anywhere. My favorite is come get with us. Please use it in a future video!

[@Psymanbee]

I agree with alot of the people here. Try the bigger single carb before going duallie. You might gain some valuable information going forward in potential future uses in using the big carb

[@ronwalsh]

Since you already have the larger single carb, might as well give her a go. Setting up dual carbs is not all that hard, just listen to the hiss from each carb, and adjust till they sound the same. Works for my 65 MGB anyway.

[@johnrodabaugh4887]

Definitely do the single carb first, but it's unlikely you will see a big gain from it. I think a cam and valvesprings would really be the key to improving your performance to 50 mph.

[@juanmangerita]

Great video...Dual carbs , better cam and valve springs, a curved ignition timing instead of a fixed one.

[@SloppyMechanics]

appreciate you boys makin these videos for me

[@gergatron7000]

V-twin manufacturers often use twin-barrel carbs to isolate the intake pulses from each other. The reason for this is because the firing order is uneven, meaning one fires then the other does quickly after (normally 0-270-720) This creates a discrepancy in intake charge between each cylinder and possibly mixture, because the second intake pulse is right on the back of the first. Making the throttles separate effectively turns one carb into two, but uses a single float, fuel inlet and throttle linkage.

[@joe08867]

To keep it rich I would suggest the dual carb setup. So much fun watching this.

[@SidneyCritic]

From memory, every 8mm 5/16" increase in intake length drops peek power 300rpm. For single carb you have to look at piston demand timing of multi cyls, ie, overlapping demand. Everything outside piston demand, ie, intake stroke from TDC to BDC, is wave-tuning, and that doesn't really rely on carb flow, Basically it's just a matter of checking if both cyls want air at the same time.

[@ezmac622]

You need to get a billet flywheel if you want to take your RPM over redline

[@ramentaryramblings]

well he needs stiffer valve springs first

[@thatonedude5237]

He's already taking it well over redline. Lol

[@gchsbus]

HEY JIMBO. That car seems so loud. What I would like to see in a future episode is you obtaining a quiet car resonator and a quiet muffler. Then maybe fabricate and run the exhaust halfway towards the front with a resonator inline then curve it back towards the back and have a muffler inline with a pipe going out the back. Then maybe measure the before and after backpressure, exhaust temp, and engine performance like 0-55 and mpg, comparing before and after. Also a measurement of decibel output before and after. Hope I gave you a great idea!

[@NLRevZ]

Those OKO carbs are a Keihin knockoff, specifically of the Keihin PWK series of carburetors. Used many of them when I was building mopeds as a late teenager, and as long as you use genuine Keihin jets and atomizers they will be just as nicely tunable as the genuine PWK carbs although a four-stroke engine will generally still run just fine with some mixture deviation from suboptimal fuel atomization, as you've already demonstrated in prior videos.

[@garyhargreaves5630]

Absolutely try the bigger Carb Jimbo. We’re all loving this. Very much appreciated that you don’t get a sentence like this anywhere else on the internet too 😂

[@robotcantina8957]

Glad you enjoy it!

[@CoyoteBytes]

I hope you are as delighted doing this as I am watching it.

[@Dwayne7834]

Thanks for the video and information. I’m for trying the single carb first.

[@webmasale]

Ooff, both options sound great, maybe a short test with the single carb and then the dual would be nice. As soon as you opened that package I got excited for all the data it'll bring.

[@rodneyross5282]

My Vote is go big then dual. Soon you will be modifying the engine insides and valves for more power. Old Red Beard has it figured out lol. Have a super blessed week.

[@greentom]

The "670 cc Renault" playlist is out of order and incomplete. Thanks for the videos. They're a fun watch.

[@RubenKelevra]

Put an RPM governor on the engine and make the CVT adjustable via a foot pedal. So you set the governor to peak performance and adjust the RPM to accelerate without dropping the RPM too much. :)

[@Wil_Liam1]

Turbo time !!! Harley and most other manufacturers have been using a single carb on their v twins for msny decades, and they work well and are simple..

[@davidhammond8049]

Hi, I'm one of your UK based viewers - I'd like to see the 36mm single first but with a view to moving to the dule carb setup once we have data on the 36...... I love your work hear on KZbin & you have inspired many an idea...... keep up the good work! Kind regards David

[@TechTonic420]

I'd love to see an AMR 500 on this 670, i think that would be really cool and it would also match the performance of the 720cc Kubota