Talked to Royal... He stated there will be no rule changes for the X mod division in 2015. Since all tracks in the southwest running X mods rules are predicated upon the Las Cruces/El Paso rules pkg. Our cars are legal at... Motiva (N.M.) Grants (NM) Tularosa (NM) Las Cruces (NM) El Paso (TX) Tucson (Az) Casa grande (Az) Canyon (Az) Arizona speedway (Az.)
Uuuuh, correction?
Posted by alh on October 23, 2014, 6:54 am, in reply to "X mod rules...2015"
OLD RULE>>>>>>>>>>>>>>ENGINES 25.Engine specifications are as follows: i.Maximum cubic inch of 360 inch. Compression of 9.5 or less w/ 5% error. (9.5 to 10.0 if you are 10.1 you aredisqualified). Rear of engine (bell housing flange) must be mounted at least 72 inches forward from centerline of rear axle. ii.Stock type, stamped rocker arms only. No roller tip rocker arms. iii.Screw-in rocker arm studs are ok. 3/8 studs only with guide plates. No stud girdles of any kind. iv.Polly locks are okay. ........................new rules/proposed rules are hilited in yellow..............................
25. Engine Specs are as follows... i Maximum cubic inch of 360 cubic inch with a 1% error. Compression of 9.5 or less with a 5% error.
So in 2015, you should be able (under the new or proposed C.I.D. rule) to run a 4.060 bore and a 3.50 stroke crank.
My understanding is red hilited rules are newly implemented and yellow hilited ones are/will be new the following calendar year.
Was this not the result of the 2014 meltdown ?
Re: X mod rules...2015
Posted by Julius on October 23, 2014, 12:54 am, in reply to "X mod rules...2015"
Sure seems they are doing the same thing the A-Mods did for the last 15-20 years that ended up pricing them out of Competition! Once you start opening up Compression, Motor rules, this and that and before long you have a class with few cars. The Late models of the 1980's and today's A-Mods, Prime example!
Joe, The X-mods have been around for more than a few years. There have been many many, changes to their rules, mostly necessitated to keep up with cost effectiveness. Example; the soft-touch rev limiter was cost effective under the older H.E.I. ignition rule, at least, until the MSD distibutors and spark boxes rivaled them in cost. Now, these are allowed. So too, as the Hoosier tire supply has dwindled, that changed(except at UCS. Probaly due to their proximity to Aztec's supply of used IMCA Hoosier tires). The $140 (retail) cost shock rule. The Tri-Y header>outlawed. The fuel additive>outlawed. The list becomes longer the farther back in history you investigate.
Also. The Multiple Spark (over 20 degrees of crankshaft rotation, depending) that an MSD delivers is from idle too 3,000 RPM's. It allows/helps in burning the typically over-rich A/F ratio needed at lower RPM's to keep the mixture correct under loads at higher RPM's. As the fuel level drops(under load) so to can the fuel ratio. Having multiple sparks in the lower RPM's aids in complete combustion under no-load.
Factory H.E.I. modules start breaking down at 5K RPM's and their aftermarket costs coupled with shaft flex etc. It made sense to allow/buy a complete MSD system for just over $300 rather than building an H.E.I. A wise rule change in my opinion. This rule change alone has probably saved more engines from detonation than the 9.5:1 compression (now 10:1) rule.
Talked to a Chrysler powered X-Mod few years back. Because of the "stock" Hall effect distributors common in production vehicles it was necessary for his team to custom build a distributor. It was verbage in the rules that necessitated that. Since the beginning of 2013 it has read "any distributor type ignition" allowed.
The management of these rules to date has been exquisitely handled. Let's hope no one (tracks) waffles and stops the upswing of this class.
With next years I.M.C.A. allowed Quik-change rearend, I'd expect to see a swing in that direction soon.
Joe, You're spot on about the late models & mods. As far as the X mods... Since Royal & Jimmy(Ray) created the class in Las Cruces a few years ago, there's been a grand total of 3 rules changes. 1.MSD boxes were legalized.We're buying used inventory to race with & most cars already had them. Makes sense to use them...according to MSD they offer no performance advantage below 7000rpm. They're optional...you don't have to have one. 2.Restrictor plates became required on all altered/hogged out Rochester carbs. Cost $44.00. They effectively negated the $800.00 Rochester soup bowl carbs&$500.00 acid dipped intake manifolds. 3.The Holley 4412 carb (unaltered) was legalized.Cost $259.00 Ricks performance in Las Cruces has a table full of used pricey Rochester carbs for sale cheap...in case anybody wants one. That's it as far as rules changing over the years for the X mod class. Cubic inch limit (360)/compression ratio 9.5/1 EVERYTHING else has remained unchanged since day 1... The powers that be down south are committed to keeping this deal affordable/competitive. ...as long as Fegan/all the other promoters stay on the same page & follow their rules...we're golden.
on October 22, 2014, 2:35 pm