GO KART TECH: Rotax Evo Vs Non-Evo Difference Explained - POWER REPUBLIC

In this week's go kart tech video we're comparing the Rotax Evo vs Non-Evo engines on the dyno, to explain the power differences.
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[@warrenrefrigerationservice654]

Thanks once again for the great video on the differences between evo and no evo. As I am one of those guys that is in that heavy group.So I will invest in a new evo motor. Really appreciate your advice. Keep the videos coming 👌👍

[@PowerRepublic]

Thanks Warren

[@godk3v]

your Videos are awesome, i love that details, big thanks to you!

[@PowerRepublic]

Thanks Kev, do you race karts?

[@mickplatts6196]

It would be awesome if you could do this same comparison with the X30 engine. New v's old exhaust and carb. Restricted v's non restricted.

[@marcsmith883]

And Upgraded X30 vs Evo

[@patriziod.b5314]

Nice video...I finally understood the difference...thanks bro...

[@PowerRepublic]

No worries PDB

[@IggySport1388]

Great video, but I'm really curious to know how much of the performance gain is down solely to the new cylinders vs the new exhaust vs the new carb. If you think about it, those are the three things that will really affect performance on evo vs non evo. The ignition timing on both engines is the same. I agree the new power valve can be of some benefit, but if you know what you're doing with the pre-evo power valve you can get similar results to the evo. Dez if you can, would you be willing to stick the evo carb and exhaust onto the pre-evo engine and redo the test? That'd show us exactly how much of the power difference is down solely to the cylinder

[@PowerRepublic]

Hey Chris, great point, the sum of all the parts makes for the power gain IMO, not just one of the bolt ons. The PV really helps with our restricted engines.

[@lthamty8767]

I would like to see the results between the X30 and the Rotax max evo

[@PowerRepublic]

Thanks Lt thats a great idea

[@VadsGaming]

Roughly what is the difference in laptime on an average track?

[@samrichardson3128]

Hi lovin the videos keep them coming, I just have a quick question, I’m thinking to upgrade my non evo senior engine to an evo engine. Have you done this yourself, if so is it worth it? Or should I just pay more to get a new evo? Also what specialist tools would I need? Thanks Sam

[@PowerRepublic]

Hey Sam, if you have the budget for it, get a brand new EVO engine. that is your best bet. Sell your old engine off to a new guy to get him started a bit cheaper and its all good

[@samrichardson3128]

@@PowerRepublic thanks for that yeah i think i'm gonna bite the bullet and get a new one, they still do a trade in scheme at rotax dealers

[@cameronfootner2871]

Hey Derek, Does this change with the "July 09" special barrel that I hear about?

[@PowerRepublic]

New EVO cylinders are the go if you haven't got an 09. I haven't tried one back to back recently but it would be a good one to do.

[@DVerbe]

Did you had the change to dyno the 2024 rotax mini and senior cilinders? Do they perform better?

[@PowerRepublic]

not yet, but as soon as they get here I will do one for you.......

[@that_murph_bloke]

Would be interested to know the difference between Jmax & senior max when run in TAG restricted. It's commonly said that the Jmax is better than senior max in TAG-R. What sort of outlay is it to upgrade a pre-EVO to EVO spec? I'm looking to move to TAG-R from Yamaha, and wondering if buying a pre-EVO is a waste of time and money.

[@PowerRepublic]

Great question. The JMax has heaps of bottom end power in both set ups, but they don't rev as high as the senior max, so you have to run a lower sprocket to compensate. The best to buy IMO at the moment is the senior max EVO, followed by the Jmax EVO, then either of the original engines. If your a light driver the non EVO senior max is still good, but it all comes down to your budget.

[@patricklampe2840]

Just a quick question. Me and my dad both run tag restricted 125 rotax engines. We both are relatively new, so we don't know much about engine setups yet. Despite running the same engine, he has a much higher tone at max throttle in his engine, and we think that he has a more sudden loss of grip on acceleration. What is the reason and how could we fix it? Also, I run 40kg of weights to get into the tag res light class. Is it a disadvantage to run solid lead weights instead of body weight? Thanks

[@rvarm21]

Could you compare dd2 engines Evo vs no Evo?

[@p.c.h.6721]

I have posted the Hp and Torque that I managed to get out of my DD2 Evo with the 125cc and 140cc Cylinder.

[@PowerRepublic]

Hi Raul, I haven't yet mate, I would have to change my dyno set up to take the DD2 engine

[@p.c.h.6721]

Power Republic I have posted the results of the Dyno for my DD2 engine on the messages, check it out!

[@ronybeltran2495]

Is it true that these engines are capable to run 94 octane from the pump? could you please explain if this is safe for practice sessions? thank you

[@PowerRepublic]

the rotax are designed for 95. we use BP 98 here, but I am sure even the budget fuels will work, although for the few extra $$ just use the 98 and be happy

[@ronybeltran2495]

@@PowerRepublic ok, so i guess for practice session should be fine, although i guess the jetting might be tricky..., thank you for the insight and the many great videos you upload, i subscribed myself right away.

[@PowerRepublic]

@@ronybeltran2495 your welcome and thanks fo the positive feedback, its awesome to help so many people with the fundamentals of go karting

[@linadukstaite6046]

My sons go kart has non Evo engine. We upgraded from mini to junior and now it has misfiring sound at 12000 rpm. The engine is fully rebuild just now. What you would suggest what I should do to fix it.

[@PowerRepublic]

did you change to ECU black box to JMax? they have their own type

[@linadukstaite6046]

No I don’t think so. Should I do it? I thought it was problem with jets.

[@linadukstaite6046]

The problem is I’m struggling to find parts for non Evo engine. Would Rotax Max Evo Junior box would be suitable for it?

[@linadukstaite6046]

And then you so much for your videos they are very helpful

[@MrAnd1010]

What about a comparison between the x30 and Rotax Max Senior? Is that possible to make? (I know it take a lot of time)

[@PowerRepublic]

This ones for you Anders, hope you like the video and share it with your friends

[@MrAnd1010]

@@PowerRepublic Thanks a lot

[@raidracing9748]

hi, could you make a video of the rotax max in dyno conkit italkit 140cc?

[@PowerRepublic]

hey raid, do you know who sells the 140 kit here in Australia?

[@raidracing9748]

@@PowerRepublic I don't know, I can tell you who sells it here in Spain, greetings

[@PowerRepublic]

@@raidracing9748 gracias, it's probably a lot more torque at the low RPM's with the bigger cylinder. Not sure how much extra top end it would make other than you could run lower gear ratios and still pull out of the corners the same, but blow past your competitors at the end of the straights. obviously its not legal for racing and would only be for fun.

[@tonykartevo]

Dont get 140cc or dd2 on rotax max both crap had both.evo kit way 2go.

[@jacksonbermingham2168]

i think to do this properly u will need to put max stuff on the evo engine

[@IggySport1388]

I wont say properly...the video wasn't about identifying exact what makes the evo make more power but simply to compare them. I agree i too am curious on whether the new exhaust, carb or cylinder has the most effect. I reckon if you put all the pre-evo ancillaries onto the evo engine the power difference would be much less than shown in this video...ie I think the main power adder is the new cylinder...but have no data to back that up... it'd be a good test to do!

[@jacksonbermingham2168]

@@IggySport1388 pretty much makes me wonder why they updated the 3d ss barrel to the rd or rb 2019 3d barrel

[@jacksonbermingham2168]

The search for parity continues .. the evo wasnt supposed to be better then a max

[@IggySport1388]

@@jacksonbermingham2168 the 2017 senior barrels aren't as good from what I've heard. I believe these are the SS ones you're referring to? The 2018 onward ones are the ones to get if you're upgrading... they're the real deal... from what I've gotten from reliable sources...slap one of these onto your older pre-evo engine and you're guaranteed a boost in performance

[@IggySport1388]

The evo is much quicker than a pre-evo max...in addition to the performance benefit highlighted in this video there is the major on track lap time improver of the evo engines ability to rev to 14800rpm. The pre-evos can only do 14150 before sitting on the limiter. Essentially what this means is an evo can be geared around 2 teeth shorter getting more bottom end yet still retaining the same top speed if not more than a pre-evo.

[@p.c.h.6721]

Hi, I had my DD2 Evo tested on a Dyno, I only managed to get 31.45hp at 11405 Rpm, and Torque 20 at 9835 Rpm. Can’t remember right now what base gasket I had on the Cylinder, I think it was 1.1 but in any case, what base gasket would you recommend for the DD2 Evo 125cc? I also tested the DD2 Evo with the 140cc Cylinder, with a base gasket of 0.5 and Squish 1.30 and the power was pretty much the same, 31.36hp at 11282 Rpm and Torque 20.5 at 9671 Rpm. So you get pretty much the same Hp and Torque with both Cylinders, 125cc and 140cc, but with the 140cc you get that power and Torque with less Rpm.

[@IggySport1388]

Every dyno reads a little differently but those figures you quote seem unusually low for a dd2 whether it be evo or pre-evo

[@p.c.h.6721]

Christopher Ramnauth That’s what I thought, 31hp for the DD2 Evo seems kind of low, unless there’s some power being lost on the Dyno where I tested my engine, I don’t know? That’s why I was asking about what base gasket should I use, and what’s the Squish? I really want to get the most power out of my engine. Thanks 🙏

[@rudyfarkas5461]

thats a nice 09 des,,lol

[@PowerRepublic]

Rodney Rudy Farkas, the 09's were a special blend. How have you been in the lockdown mate?

[@rudyfarkas5461]

@@PowerRepublic nothin changed 4 me just the phone has stoped ,steady flow of engines but not cars where my bread an butter come from ,how u goin ,gossip tells me u had to get a job ?,I might have to go down that path ,cheers rudy

[@PowerRepublic]

@@rudyfarkas5461 same as everyone else, not much going on with everything shut. Yeah got some contract work with Jason from lift industries fitting out truck bodies. It heaps good, i should make a video about it!!!

[@rudyfarkas5461]

@@PowerRepublic all about food on the table so long ur flexible u be ok