RMCIT: Superb conclusion at Le Mans
RMCIT: Superb conclusion at Le Mans

RMCIT: Superb conclusion at Le Mans

RMCIT: Superb conclusion at Le Mans

RMCIT: Superb conclusion at Le Mans

The 7th edition of the Rotax MAX Challenge International Trophy came to a spectacular conclusion on Saturday, 19th July at Le Mans. Maximum intensity and elevated spectacle accompanied the Final...
Livestream Super Heats Rotax MAX Challenge International Trophy 2025 at Le Mans
Livestream Super Heats Rotax MAX Challenge International Trophy 2025 at Le Mans

Livestream Super Heats Rotax MAX...

Livestream Super Heats Rotax MAX Challenge International Trophy 2025 at Le Mans

Livestream Super Heats Rotax MAX Challenge International Trophy 2025 at Le Mans

No fewer than 354 drivers are expected at the Le Mans International Circuit this year, confirming the immense appeal of the Rotax Max Challenge International Trophy. 3MK Events, in collaboration with...
The heat is on during the RMCIT Qualifying Heats
The heat is on during the RMCIT Qualifying Heats

The heat is on during the RMCIT...

The heat is on during the RMCIT Qualifying Heats

The heat is on during the RMCIT Qualifying Heats

In increasingly hot weather, the 343 drivers competing in the 2025 Rotax MAX Challenge International Trophy contested 36 Qualifying Heats before tackling the Super Heats on Saturday morning to select...
Livestream Friday Heats: Rotax MAX Challenge International Trophy 2025 at Le Mans
Livestream Friday Heats: Rotax MAX Challenge International Trophy 2025 at Le Mans

Livestream Friday Heats: Rotax MAX...

Livestream Friday Heats: Rotax MAX Challenge International Trophy 2025 at Le Mans

Livestream Friday Heats: Rotax MAX Challenge International Trophy 2025 at Le Mans

No fewer than 354 drivers are expected at the Le Mans International Circuit this year, confirming the immense appeal of the Rotax Max Challenge International Trophy. 3MK Events, in collaboration with...
Close qualifying at the 2025 RMCIT in Le Mans
Close qualifying at the 2025 RMCIT in Le Mans

Close qualifying at the 2025 RMCIT in Le...

Close qualifying at the 2025 RMCIT in Le Mans

Close qualifying at the 2025 RMCIT in Le Mans

After familiarising themselves with the Le Mans International Circuit during Free Practice, the 343 participants in the 2025 Rotax Max Challenge International Trophy competed with great energy during...
The Rotax Electric Kart Cup Italy 2025 doubles the race action in Sarno
The Rotax Electric Kart Cup Italy 2025 doubles the race action in Sarno

The Rotax Electric Kart Cup Italy 2025...

The Rotax Electric Kart Cup Italy 2025 doubles the race action in Sarno

The Rotax Electric Kart Cup Italy 2025 doubles the race action in Sarno

BRP-Rotax, in cooperation with Authorised Rotax Distributor Kart-Shop Italia, announces the first Rotax Electric Kart Cup Italy 2025 as a feature category on the weekend of August 30th - 31st at the...
Results: Rotax MAX Challenge International Trophy 2025 at Le Mans
Results: Rotax MAX Challenge International Trophy 2025 at Le Mans

Results: Rotax MAX Challenge...

Results: Rotax MAX Challenge International Trophy 2025 at Le Mans

Results: Rotax MAX Challenge International Trophy 2025 at Le Mans

No fewer than 354 drivers are expected at the Le Mans International Circuit this year, confirming the immense appeal of the Rotax Max Challenge International Trophy. 3MK Events, in collaboration with...
Live timing: Rotax MAX Challenge International Trophy 2024 at Le Mans
Live timing: Rotax MAX Challenge International Trophy 2024 at Le Mans

Live timing: Rotax MAX Challenge...

Live timing: Rotax MAX Challenge International Trophy 2024 at Le Mans

Live timing: Rotax MAX Challenge International Trophy 2024 at Le Mans

No fewer than 354 drivers are expected at the Le Mans International Circuit this year, confirming the immense appeal of the Rotax Max Challenge International Trophy. 3MK Events, in collaboration with...
Rotax MAX Challenge Euro Trophy entries open for Sarno
Rotax MAX Challenge Euro Trophy entries open for Sarno

Rotax MAX Challenge Euro Trophy entries...

Rotax MAX Challenge Euro Trophy entries open for Sarno

Rotax MAX Challenge Euro Trophy entries open for Sarno

Entries are now open for the final round of the 2025 Rotax MAX Challenge Euro Trophy.
New records for Rotax Max Challenge International Trophy Season Seven
New records for Rotax Max Challenge International Trophy Season Seven

New records for Rotax Max Challenge...

New records for Rotax Max Challenge International Trophy Season Seven

New records for Rotax Max Challenge International Trophy Season Seven

No fewer than 354 drivers are expected at the Le Mans International Circuit this year, confirming the immense appeal of the Rotax Max Challenge International Trophy.
Intense heat and high stakes in Genk:  Round 3 of the RMCET delivers
Intense heat and high stakes in Genk:  Round 3 of the RMCET delivers

Intense heat and high stakes in Genk: ...

Intense heat and high stakes in Genk: Round 3 of the RMCET delivers

Intense heat and high stakes in Genk: Round 3 of the RMCET delivers

The 2025 Rotax MAX Challenge Euro Trophy arrived at Karting Genk ‘Home of Champions’ for its third and penultimate round of the season. Set in one of the most iconic karting venues in the...
Title pressure builds in Genk as the 2025 RMCET nears its finale
Title pressure builds in Genk as the 2025 RMCET nears its finale

Title pressure builds in Genk as the...

Title pressure builds in Genk as the 2025 RMCET nears its finale

Title pressure builds in Genk as the 2025 RMCET nears its finale

As the 2025 Rotax MAX Challenge Euro Trophy entered its third and penultimate round, the championship landed at the iconic Karting Genk: The Home of Champions.
Memorable Sunday at Genk as Round 3 delivers high drama and new winners
Memorable Sunday at Genk as Round 3 delivers high drama and new winners

Memorable Sunday at Genk as Round 3...

Memorable Sunday at Genk as Round 3 delivers high drama and new winners

Memorable Sunday at Genk as Round 3 delivers high drama and new winners

An unforgettable showdown at Karting Genk – The Home of Champions saw Round 3 of the Rotax MAX Challenge Euro Trophy come to a close with dramatic finales, fierce competition, and a...
Livestream: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk
Livestream: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

Livestream: 2025 RMC Euro Trophy Round 3...

Livestream: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

Livestream: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

The 2025 Rotax MAX Challenge Euro Trophy moves into its third and penultimate round with a stop at one of its most iconic venues: Karting Genk – The Home of Champions. A staple in the RMCET...
Spencer, Ashcroft, Butcher, Bol and Picot lead the way after Heats in Genk
Spencer, Ashcroft, Butcher, Bol and Picot lead the way after Heats in Genk

Spencer, Ashcroft, Butcher, Bol and...

Spencer, Ashcroft, Butcher, Bol and Picot lead the way after Heats in Genk

Spencer, Ashcroft, Butcher, Bol and Picot lead the way after Heats in Genk

A full day of racing unfolded at Karting Genk – The Home of Champions, host of the third round of the 2025 Rotax MAX Challenge Euro Trophy.
Results: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk
Results: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

Results: 2025 RMC Euro Trophy Round 3 at...

Results: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

Results: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

The 2025 Rotax MAX Challenge Euro Trophy moves into its third and penultimate round with a stop at one of its most iconic venues: Karting Genk – The Home of Champions. A staple in the RMCET...
Qualifying and first heats complete as Round 3 begins under clear skies at Genk
Qualifying and first heats complete as Round 3 begins under clear skies at Genk

Qualifying and first heats complete as...

Qualifying and first heats complete as Round 3 begins under clear skies at Genk

Qualifying and first heats complete as Round 3 begins under clear skies at Genk

The third round of the 2025 Rotax MAX Challenge Euro Trophy is underway at the legendary Karting Genk – The Home of Champions, where the action resumed today under mild conditions after a rainy...
Live timing: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk
Live timing: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

Live timing: 2025 RMC Euro Trophy Round...

Live timing: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

Live timing: 2025 RMC Euro Trophy Round 3 at the Home of Champions – Karting Genk

The 2025 Rotax MAX Challenge Euro Trophy moves into its third and penultimate round with a stop at one of its most iconic venues: Karting Genk – The Home of Champions. A staple in the RMCET...
202 Drivers set for round 3 of the RMCET at Genk
202 Drivers set for round 3 of the RMCET at Genk

202 Drivers set for round 3 of the RMCET...

202 Drivers set for round 3 of the RMCET at Genk

202 Drivers set for round 3 of the RMCET at Genk

The 2025 Rotax MAX Challenge Euro Trophy enters its penultimate chapter this week at one of the most iconic tracks on the calendar: Karting Genk – The Home of Champions. This legendary Belgian...
Genk prepares to host Round 3 of the 2025 Rotax Max Challenge Euro Trophy
Genk prepares to host Round 3 of the 2025 Rotax Max Challenge Euro Trophy

Genk prepares to host Round 3 of the...

Genk prepares to host Round 3 of the 2025 Rotax Max Challenge Euro Trophy

Genk prepares to host Round 3 of the 2025 Rotax Max Challenge Euro Trophy

The 2025 Rotax MAX Challenge Euro Trophy moves into its third and penultimate round with a stop at one of its most iconic venues: Karting Genk – The Home of Champions.

LIVETIMING: Rotax Max Euro Trophy is back to racing this weekend!

LIVETIMING: Rotax Max Euro Trophy is back to racing this weekend! Read more

Over 130 drivers from nearly 20 nations will bring back the #RotaxRoar at Karting Genk: Home of Champions, as we head to timed qualifying this afternoon at 1630 CEST after 167 days of waiting!  August 7th will see the welcome return of the Rotax MAX Challenge Euro Trophy, which has been laying dormant for a long time after the conclusion of the Rotax Max Challenge Winter Cup at Circuito Karting Campillos.

ROTAX MAX Euro Trophy returns to action

ROTAX MAX Euro Trophy returns to action Read more

August 7th will see the welcome return of the Rotax MAX Challenge Euro Trophy, which has been laying dormant for 166 days after the conclusion of the Rotax Max Challenge Winter Cup at Circuito Karting Campillos.

Rotax Racing CKT Round #1

Rotax Racing CKT Round #1 Read more

The Colorado Karting Tour finally kicked-off its season in the COVID-19 effected year at the beautiful Grand Junction Motor Speedway facility.

Rotax Stars & Stripes Trophy Series Rescheduled

Rotax Stars & Stripes Trophy Series Rescheduled Read more

After a difficult start to the 2020 year, America and the sport of karting has begun to retake some normality with racing officially beginning to take shape. J3 Competition is pleased to announce its rescheduled northeast Rotax regional Stars & Stripes Trophy program.  The three-race format which is highlighted with a single practice day and one day of racing allows for nearly anyone to compete along with only one set of new slick tires required for racing.  The series will resume at the original northeast venues with a revised rotation and date format which follows:

“Rotax project e20” Electric racing for the next generation – be part of the future!

“Rotax project e20” Electric racing for the next generation – be part of the future! Read more

Rotax team is testing the new project E20 electric kart and the results are very impressive - 25 laps on a single charge! One hour charge time and the e-kart is ready to go again!

2020 US Rotax Grand Nationals Rescheduled

2020 US Rotax Grand Nationals Rescheduled Read more

The 2020 US Rotax Grand Nationals have successfully been rescheduled to take place at Charlotte Motor Speedway on September 18-20.  The new date was slotted in with several key factors including facility availability as well as working to create minimal conflicts across the country with other clubs, regional and national programs.

The 2020 RMCIT is postponed in Portimão, from 8th to 13th December

The 2020 RMCIT is postponed in Portimão, from 8th to 13th December Read more

Further to the worldwide travel restrictions due to the COVID-19 virus, BRP-Rotax and 3MK Events have carefully taken the decision to postpone the 2nd edition of the Rotax MAX Challenge International Trophy, which would have taken place from Tuesday 28th July to Saturday 01st August 2020 at Le Mans Karting International track, in France.

BRP-Rotax has decided to postpone the 2020 Rotax MAX Challenge Grand Finals till January 2021! New location: Portimão in Portugal

BRP-Rotax has decided to postpone the 2020 Rotax MAX Challenge Grand Finals till January 2021! New location: Portimão in Portugal Read more

In light of the COVID-19 pandemic and current travel restrictions, BRP-Rotax has decided to postpone the 2020 Rotax MAX Challenge Grand Finals till January 2021, and to change the location to the city of Portimão in Portugal. The 2020 RMC Grand Finals will take place in Portimão, Portugal, from January 23 to January 30, 2021.

Rotax Racing CKT Round #1

Rotax Racing CKT Round #1 Read more

The Colorado Karting Tour finally kicked-off its season in the COVID-19 effected year at the beautiful Grand Junction Motor Speedway facility.  The GJMS facility has played host to several high profile events in its day as the facility offers a picturesque and challenging circuit which did not disappoint at the opening CKT event.

US Rotax Grand Nationals scheduled for July 2-5 in Concord, North Carolina has been postponed.

US Rotax Grand Nationals scheduled for July 2-5 in Concord, North Carolina has been postponed. Read more

With the event set to take place offering international RMCGF tickets alongside a host of exciting awards the inability to have the event take place with true international flair and resources has resulted in the unfortunate decision to postpone the event.

Round 1 of the Rotax Max Euro Trophy planned at PFI has been cancelled; new profissional calendar

Round 1 of the Rotax Max Euro Trophy planned at PFI has been cancelled; new profissional calendar Read more

Statement! Following our early announcement this afternoon, we would like to confirm the following....

Rotax Stars & Stripes Trophy Round 1 Postponed

Rotax Stars & Stripes Trophy Round 1 Postponed Read more

With businesses begin opened under ‘Phased’ steps  the outlook for returning to racing in many parts of the country has already begun.  Unfortunately, the state New York, which has been most heavily impacted by the COVID-19 pandemic (mainly New York City) has caused the entire state be on a lengthened return to normalcy.

Canadian karter Patrick Woods-Toth is the first Champion of the Rotax Sim Racing Challenge

Canadian karter Patrick Woods-Toth is the first Champion of the Rotax Sim Racing Challenge Read more

Patrick Woods-Toth has secured the champion’s title at the first-ever running of the Rotax SIM RACING Challenge. Taking P2 in the opening Pre-Final, Patrick matched the pace of fastest qualifier and race winner Johnny Guindi - with nothing between them.

Gear up and prepare the US Rotax Grand Nationals!

Gear up and prepare the US Rotax Grand Nationals! Read more

UNITED STATES Rotax MAX Challenge Supplemental Regulation 2020

The first Rotax SIM RACING Challenge is online with the livetiming

The first Rotax SIM RACING Challenge is online with the livetiming Read more

During this COVID-19 situation, where we all have to stay safe at home, we are pleased to announce a special race for our worldwide Rotax family, as well as everyone else interested to participate, to compete against each other online in the Rotax SIM RACING Challenge.

UAE Rotax MAX Challenge 2019-20 ROUND 8 to be held 25-26 September 2020

UAE Rotax MAX Challenge 2019-20 ROUND 8 to be held 25-26 September 2020 Read more

UAE Rotax MAX Challenge 2019-20 ROUND 8 will be held 25-26 September 2020. The organization reports the following: "Despite this unprecedented period amidst lockdown and isolation, we have something tangible to look forward to! Right now we share a responsibility within the UAE community - to play our part by staying at home to protect ourselves, each other and those on the front lines.We are all in this together. Please respect the guidance and advice from the UAE Government and let’s look after ourselves, our loved ones and the wider community.”
 

First Rotax SIM RACING Challenge

First Rotax SIM RACING Challenge Read more

BRP-Rotax is very pleased to announce the launch of a special event for the worldwide Rotax family, as well as everyone else interested to participate: the first-ever Rotax SIM RACING Challenge, a virtual reality race on the platform of iRacing.com.

RotaxKarting: Project E20 in Action

RotaxKarting: Project E20 in Action Read more

Watch the NEW Project E20 electric kart defeat the Rotax Thunder by far!

RotaxKarting: Bring Your Dreams - We´ve Got the Challenge

RotaxKarting: Bring Your Dreams - We´ve Got the Challenge Read more

Every year Rotax karting set out with one goal, one dream. To race our way to a ticket to the Rotax MAX Challenge Grand Finals. The most unique karting event in the World

Update: MAX Challenge Euro Trophy revises events

Update: MAX Challenge Euro Trophy revises events Read more

The Rotax MAX Challenge Euro Trophy has responded to the ongoing corona pandemic and revised the 2020 calendar again.

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Vortex: New Homologated Engines
Bas Kaligis
/ Categories: Technical

Vortex: New Homologated Engines

OK and OKJ Class: DST and DJT

Several technical innovations mark out the new engines. Three important main targets were followed with the DST and DJT projects: weight reduction, overall dimensions reduction, lowering of the center of gravity. The achieved outcome: two engines even lighter than the predecessors, allowing better weight distribution and improved vehicle dynamics resulting in an increased vehicle's performance.

The engine block was designed with new crankcases, new crankshaft, new balancing shaft, etc. While remaining similar to the previous layout the engine block was designed to be stiffer and provided with fully machined intake section and transfers. This manufacturing option allowed to improve the overall engine performance repeatability.

The new balancing shaft, diving deeper in detail about one of the most important design changes, no longer works in a chamber filled with oil which means lower friction losses and improved performance. The new design briefly introduced above allowed a consistent performance improvement, a consistent weight reduction and a better weight distribution.

 

KZ Class: RSZ and RTZ

The new RSZ and RTZ engines are strictly resulting from the reigning world champion engine RKZ and retain the concerning best qualities. The underlying premise of the new project was a functional development to increase performance and improve torque delivery. To achieve this outcome the work of the technicians was focused mainly on the crankcases, redesigned and fully machined. This manufacturing option moreover allowed to improve the overall engine performance repeatability.

Together with it a new head with insert was included, provided as standard, featuring a modified combustion chamber profile. The RSZ engine setup differs with respect to both the RTZ and RKZ. In particular, the RTZ shares with the RKZ the connecting rod, while the RSZ is equipped with a shorter conrod, with center-to-center distance equal to 110 mm. The RSZ features a torque curve able to ease the driver to race on short to mean length tracks. Both engines are supplied with a specific exhaust silencer, muffler.

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