Posted By racingfool on 26 Nov 2014 10:14 PM
"C.
Sports Racers and All Open-Wheel Cars Including Formula Atlantics:
1. May use any automobile-based 2v/cyl engine up to 1300 cc, any
2-stroke motor up to 900 cc, any 4v/cyl or more engine up to 1005
cc.
Minimum weight with driver: ........................................... 1020 lbs.
2. May use any 2v/cyl automobile-based production engines up to
1615 cc.
Minimum Weight with driver ............................................1110 lbs.
3. May use any 4v/cyl or more engine up to 1615 cc. May use any
2- stroke up to 1300 cc, Mazda 12A rotary with any porting and
any carburetion. May use fuel injection without weight penalty as
required by the GCR.
Minimum weight with driver ............................................ 1180 lbs.
4. May use any naturally-aspirated engine up to 3000 cc.
Minimum weight with driver ............................................ 1285 lbs."
I wanted to add a little more clarity on engine size and minimum weights in BM. Although BM is generally based on the GCR (the General Competition Rules, the SCCA road racing rules), weights and engine rules do not carry over to Solo. BM allows vehicles from a number of different GCR classes with different performance potential. In order to even things out as much as possible between the different GCR classes running BM, the engine size and vehicle weight has been disconnected from the GCR and are regulated by BM-specific rules in the Solo rulebook. racingfool posted these rules, Section C under B-Modified in Appendix A. In Solo, there is a fixed relationship between engine displacement and minimum vehicle weight (including driver). Well, with one exception. Formula Continentals are listed separately in Section D.
racingfool must have copied the text in his post out of an older rulebook. I can tell since forced induction engines are not permitted anymore (they previously were with a multiplier of 1.4 as defined in 18.0.B in the Solo Rules). Here are the BM engine/weight rules out of the 2014 Solo Rules:
C. Sports Racers and All Open-Wheel Cars Including Formula Atlantics:
1. Turbocharged and supercharged engines are not permitted.
2. May use any automobile-based 2v/cyl engine up to 1300 cc, any
2-stroke motor up to 900 cc, any 4v/cyl or more engine up to 1005
cc.
Minimum weight with driver:............................................ 1020 lbs.
3. May use any 2v/cyl automobile-based production engines up to
1615 cc.
Minimum Weight with driver:............................................1110 lbs.
4. May use any 4v/cyl or more engine up to 1615 cc. May use any
2- stroke up to 1300 cc, Mazda 12A rotary with any porting and
any carburetion. May use fuel injection without weight penalty as
required by the GCR.
Minimum weight with driver:............................................ 1180 lbs.
5. May use any engine up to 3000 cc.
Minimum weight with driver:............................................ 1285 lbs.
6. Minimum rim width:................................................................ none.
7. Maximum allowed rim width:.................................................. 15 in.
D. Formula 2000, classed in Formula Continental per GCR/FCS:
1. Minimum weight with driver:.............................................1090 lbs.
2. Rim width:.................................................................... unrestricted
3. Airfoil maximum size per Formula Atlantic rules.