Allow the #420924502 Rotary Valve in Rotax Model 494 Engine
#33593 from Rick Eskola · No action required · Minutes (2023-02 Fastrack)
Thank you for your letter. Please see the response to letter #33584 in this Fastrack's Technical Bulletin.
BoP Lab / Drivers / Rick Eskola
Rick Eskola 2 letters to Fastrack
Against the front of the class, by track and class
| Track | Class | Sessions | Typical gap to class best | Closest |
|---|---|---|---|---|
| Road America (4.05 mi) | F5 | 9 | +14.185s (9.87%) | +6.564s (4.52%) |
| Road America (4.05 mi) | F6 | 11 | +10.418s (7.47%) | +7.157s (5.15%) |
Gap is the driver's best lap in a session against the fastest lap in their class in that same session (zero is fastest in class), shown as time lost and as a share of the lap, so conditions cancel out and tracks can be compared. Typical is the median session.
Road America (4.05 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| June Sprints 2026 | Grp 2 FF FV F6 Race 2 | F6 | 04 | KBS MK- 7 | 3/12 | 2:30.761 | 2:22.780James Weida | +7.981s (5.59%) | 126.48/12 | 142.7Aaron Ellis | -16.3 mph (-11.4%) |
| June Sprints 2026 | Grp 2 FF FV F6 Race 1 | F6 | 04 | KBS MK- 7 | 6/12 | 2:31.535 | 2:22.522Aaron Ellis | +9.013s (6.32%) | 124.38/12 | 141.7Sven De Vries | -17.4 mph (-12.3%) |
| June Sprints 2026 | Grp 2 FF FV F6 Qual 2 | F6 | 04 | KBS MK- 7 | 8/14 | 2:35.034 | 32.929Jason Martin | +122.105s (370.81%) | 128.48/14 | 141.9Calvin Stewart | -13.6 mph (-9.6%) |
| Runoffs 2024 | F6 Race | F6 | 04 | Quadrini Invader QC1 | 12/22 | 2:25.997 | 2:18.840James Weida | +7.157s (5.15%) | 134.916/22 | 147.6Calvin Stewart | -12.7 mph (-8.6%) |
| Runoffs 2024 | FF/F6 Qual 3 | F6 | 04 | Quadrini Invader QC1 | 12/20 | 2:29.907 | 2:19.489Calvin Stewart | +10.418s (7.47%) | 130.916/20 | 144.0Calvin Stewart | -13.1 mph (-9.1%) |
| Runoffs 2024 | F6 Qual 2 | F6 | 04 | Quadrini Invader QC1 | 9/19 | 2:26.878 | 2:19.106Calvin Stewart | +7.772s (5.59%) | 135.712/19 | 146.1Calvin Stewart | -10.4 mph (-7.1%) |
| Runoffs 2024 | FF/F6 Qual 1 | F6 | 04 | Quadrini Invader QC1 | 12/19 | 2:41.293 | 2:23.531Jason Martin | +17.762s (12.38%) | 127.812/19 | 142.8Calvin Stewart | -14.9 mph (-10.5%) |
| June Sprints 2024 | Grp 1 FV F6 FF Race 2 | F6 | 04 | Invader QC1 | 4/11 | 2:31.622 | 2:23.891Jason Martin | +7.731s (5.37%) | |||
| June Sprints 2024 | Grp 1 FV F6 FF Race 1 | F6 | 04 | Invader QC1 | 6/6 | 3:38.284 | 2:51.288Jason Martin | +46.996s (27.44%) | 100.45/6 | 122.9George Bugg | -22.5 mph (-18.3%) |
| June Sprints 2024 | Grp 1 FV F6 FF Qual | F6 | 04 | Invader QC1 | 8/11 | 2:32.417 | 2:20.445Calvin Stewart | +11.972s (8.52%) | 132.18/11 | 141.2Aaron Ellis | -9.1 mph (-6.5%) |
| June Sprints 2024 | Grp 1 FV F6 FF Prac | F6 | 04 | Invader QC1 | 10/10 | 3:35.461 | 2:22.818Calvin Stewart | +72.643s (50.86%) | 96.610/10 | 143.2Calvin Stewart | -46.5 mph (-32.5%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 1 FV,F5,FF Race 2 | F5 | 04 | QC1 INVADER | 10/10 | 2:34.830 | 2:23.742Sven de Vries | +11.088s (7.71%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 1 FV,F5,FF Race 1 | F5 | 04 | QC1 INVADER | 4/9 | 2:31.656 | 2:25.092Sven de Vries | +6.564s (4.52%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 1 FV,F5,FF Qual 2 | F5 | 04 | QC1 INVADER | 8/9 | 2:36.033 | 2:23.386Sven de Vries | +12.647s (8.82%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 1 FV,F5,FF Qual 1 | F5 | 04 | QC1 INVADER | 9/11 | 2:33.190 | 2:23.680Calvin Stewart | +9.510s (6.62%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 1 FV,F5,FF Prac | F5 | 04 | QC1 INVADER | 9/10 | 2:37.932 | 2:23.747Calvin Stewart | +14.185s (9.87%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 6 FV,FF,F5 Race 2 | F5 | 04 | QC1 INVADER | 11/14 | 2:45.768 | 2:24.094Calvin Stewart | +21.674s (15.04%) | 120.914/14 | 140.7Eric McRee | -19.8 mph (-14.1%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 6 FV,FF,F5 Race 1 | F5 | 04 | QC1 INVADER | 11/12 | 2:53.766 | 2:24.201James Weida | +29.565s (20.50%) | 119.011/12 | 140.5Eric McRee | -21.5 mph (-15.3%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 6 FV,FF,F5 Qual 2 | F5 | 04 | QC1 INVADER | 14/14 | 2:42.495 | 2:26.372Eric McRee | +16.123s (11.02%) | 123.311/13 | 137.9Eric McRee | -14.6 mph (-10.6%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 6 FV,FF,F5 Qual 1 | F5 | 04 | QC1 INVADER | 8/13 | 2:37.753 | 2:22.751Calvin Stewart | +15.002s (10.51%) | 125.013/13 | 139.3Calvin Stewart | -14.3 mph (-10.2%) |
Letters to Fastrack
F5 Weight Reduction Request
#31880 from Rick Eskola · Not recommended · Minutes (2022-02 Fastrack)
Thank you for your letter. These changes are not recommended. The Club Racing Board will continue to monitor class
performance and will make adjustments if warranted by the data.