Engines

[allof6]

Honda, Yamaha or Suzuki
05-2013
32mm Restrictor
875lbs

http://scca.cdn.racersites.com/prod/...k-nov-club.pdf

[SEComposites]

Is that official? Do you have a link?
Thanks

[allof6]

It would appear that in the process of adding the MC engines they omitted the restrictor from the 593 2 stroke. Typo? Don't know.

[lancer360]

I hope it was a typo. If not they just obsoleted every 493 and 494.

[Daryl DeArman]

How much peak HP does a top 494 make?

How reasonable is it to meet 700# minimum with that setup?

[lancer360]

700 lbs is for the old 440cc engine.

494 = 800 lbs
493 = 825 lbs
593 = 850 lbs
600cc MC = 875 lbs

[allof6]

How much peak HP does a top 494 make?

How reasonable is it to meet 700# minimum with that setup?

http://www.wptracing.com/F500%20vs%20600%20SCCA.pdf

[mark 21]

You will see between 102 to 110 hp from all the 494s 493s and 593s. The 593s have a restricter plate in them. It all depends on who's dyno and what day of the week. They are all within 2 to 3 hps. The 494s come in at 800lbs after race with driver. the 493s 825lbs. 593s 850lbs. and the mc powered cars at 875lbs. The 593 has a wider RPM torque band that is why the extra weight on it.

[Daryl DeArman]

ah....missed the 800# limit. Just saw the 700, 825, 850 and 875 options.

[Jnovak]

Do not get too excited guys, you need to read the entire rule set for F500.

The 593 restrictor is defined in another section of the F500 rules. I have already mentioned this to members of the CRB and it is my understanding that the restrictor wording will also be placed in the engine spec line too.

However, it is ALWAYS a very good idea to read the entire section of the rules that apply to your class. Also a good idea to familiarize yourself with the entire GCR.

Here is the wording from the 2013 GCR that is in addition to any spec line:

14. Engines
Engines shall be two?cylinder, two?cycle, water?cooled in stock configuration
as listed below: Fuji “Chaparral” Model G44bw. “Kawasaki
TC440A”/C?200, B-201, C-201, C?202, F?202, and G?203. The F?202
and the G?203 are electric start engines. Cylinder head P/N 440/2A is
permitted for the engines listed. Only the “A” series engine is legal; the
use of any parts from other Kawasaki series engines is prohibited. Rotax
Model 494 and Model 493, single expansion chamber and electric and/
or pull starter, and Rotax 494 RAVE engine must use the 494 non-RAVE
rotor, Ski Doo part numbers 420 924 509 or 420 924 508, 147 degree
designation. RAVE valves may be blocked in the “full open” position
or left as delivered. 494 RAVE and non-RAVE cylinder heads may not
be interchanged between engines. Rotax 593 in a carbureted, non-HO
version; must run inlet tract restrictors, Cometic gasket part number
MA0242SP1020A, one in each tract immediately after the carburetor;
single expansion chamber; electric and/or pull starter. Alternate restrictor
plate option allowed the Rotax 593 engine part number
MA0242SP1063A.

[lancer360]

I figured it was overlooked when the engine chart was made. Wasn't completely sure what wording would be removed from the current rule set when the engine chart was added so i figure we needed to bring it to the CRB/BOD attention. This way it is correct before it gets put into the GCR.

[Jnovak]

I figured it was overlooked when the engine chart was made. Wasn't completely sure what wording would be removed from the current rule set when the engine chart was added so i figure we needed to bring it to the CRB/BOD attention. This way it is correct before it gets put into the GCR.

always a good plan Chris.

[allof6]

Do not get too excited guys, you need to read the entire rule set for F500.

The 593 restrictor is defined in another section of the F500 rules. I have already mentioned this to members of the CRB and it is my understanding that the restrictor wording will also be placed in the engine spec line too.

However, it is ALWAYS a very good idea to read the entire section of the rules that apply to your class. Also a good idea to familiarize yourself with the entire GCR.

Here is the wording from the 2013 GCR that is in addition to any spec line:

14. Engines
Engines shall be two?cylinder, two?cycle, water?cooled in stock configuration
as listed below: Fuji “Chaparral” Model G44bw. “Kawasaki
TC440A”/C?200, B-201, C-201, C?202, F?202, and G?203. The F?202
and the G?203 are electric start engines. Cylinder head P/N 440/2A is
permitted for the engines listed. Only the “A” series engine is legal; the
use of any parts from other Kawasaki series engines is prohibited. Rotax
Model 494 and Model 493, single expansion chamber and electric and/
or pull starter, and Rotax 494 RAVE engine must use the 494 non-RAVE
rotor, Ski Doo part numbers 420 924 509 or 420 924 508, 147 degree
designation. RAVE valves may be blocked in the “full open” position
or left as delivered. 494 RAVE and non-RAVE cylinder heads may not
be interchanged between engines. Rotax 593 in a carbureted, non-HO
version; must run inlet tract restrictors, Cometic gasket part number
MA0242SP1020A, one in each tract immediately after the carburetor;
single expansion chamber; electric and/or pull starter. Alternate restrictor
plate option allowed the Rotax 593 engine part number
MA0242SP1063A.

Jay,
Has the rule set been updated? the only one I can find is September and that was before the MC vote. Thanks.

[Jnovak]

November Fastrack

http://scca.cdn.racersites.com/prod/...k-nov-club.pdf

I have been assured that the new spec line engine definition will include the Rotax 593 with the restrictors.

[chris huskamp]

Jay is right. I also raised the 593 to the CRB when they were working through this and it is still restricted as before. And to also confirm see the November Fastrack for the full rulkes set.
Huskamp

[bimmer635csi]

I hope that this isn't a trend that will start affecting sport bike motors.

Turbocharged Motorcycles at Tokyo Motor Show

If it does, F600, F1000, Dwarf cars, etc will all have to rethink the powerplants in 10 or 20 years.