Bryan choked on the last lap, he had it locked down otherwise.
Bryan choked on the last lap, he had it locked down otherwise.
RM CMC Director
Last edited by michaelmosty; 06-30-2018 at 09:36 AM.
-Michael Mosty
CMC #11 Mosty Brothers' Racing
Director - TX Region
6.29 Rear axles
6.29.1 Any OEM stock differential housing that was originally offered in an eligible model car is allowed. Updating/Backdating of OEM stock differential housings is allowed.
6.29.2 Both GM and Ford cars may also use a Ford 9”, GM 12 bolt, or Dana 44 rear axle housing, but the housing must maintain both the exact OEM suspension pickup points and OEM rear end geometry as the originally equipped axle assembly.
6.29.3 Any gear ratio equal to or numerically lower than 4.11 that fits the stock/alternate differential case without modification may be used. Differentials may be fully locked (welded) or use any commercially available mechanical limited slip.
6.29.4 Any commercially available replacement type steel or alloy steel axles may be used. Full floater axles are prohibited. Heavy-duty non-”C" Clip style axle ends are allowed and recommended. Competitors should carefully select axle ends. Many of the "C" clip eliminator axle ends are designed for street or drag strip use only and cannot withstand the side loads associated with road racing.
6.29.5 Differentials or differential covers may have a drain plug added.
Can some one explain to my why a aluminum diff. cover in against the rules??
Last edited by Storm Trooper; 07-01-2018 at 08:08 PM. Reason: Rules
Standard answer. It's not needed. If was made legal, lots of people would think they needed one and lots of money would be wasted. The coolest thing about an aluminum cover is the availability of a drain. As a compromise, they allowed a drain be added to the stock cover.
Richard P.
(The coolest thing about an aluminum cover is the availability of a drain.) not to mention increasing the capacity of the oil, cooling the oil, supporting the bearing caps.
Big brakes were not needed, 260 hp was not needed! But people wanted them so.....the rules are telling us where not to waste our money?
Again, all that crap is overkill and a waste of money (on a 230 hp car with shit tires). At the current state of things, does this need to be revisited? Probably.
NASA, not the CMC management, mandated the S197 Mustang and the LS Camaro. Neither one of them could realistically get to the 230 hp number. Once you've gone there, along with wider and stickier rubber, big brakes actually save money over the old crap that had to be replaced often if you do enough events. Do I like where the whole thing has gotten to? No, and I don't believe many people do. If crap tires were mandated way back when, we wouldn't have needed big brakes and we wouldn't be hurting transmissions, rear ends, etc. at the rate that we are. We are literally tearing the tubs apart on these ancient cars. And we are spending a lot of money doing it. The whole thing doesn't make much sense...
Richard P.
Marshall Mosty
AI/SI Texas Regional Director
2011 NASA-TX American Iron Champ
AI #67 "Mosty Brothers' Racing" (RIP)
ST6 #21 Toyota Corolla (being revived)...
I completely understand this sentiment. It's one of the biggest things mentally I've had to get over transitioning to this series. In my endurance days it was all about finishing the stint to hand the car back off to the next guy to stay in the race... No risks, no dumb decisions, no risky moves.
One of the best things I've done to my car is not put another $4k machine shop built engine back in it. Mentally it's been great knowing that if I pop the explorer engine I'm out way less money. So I'll hit the limiter occasionally trying to make a pass, etc. Never did that on the old one and it blew up fantastically for my trouble... currently considering picking another one up from the junkyard and having it ready to go in the trailer....
Daniel Records
CMC # 34
In 2015 my car dynoed 70hp low. Turns out I'd lost a rod bearing the last race of the year prior. I forgot how weird the car had felt the last lap or 2 and how I'd just cruised there because we were really spread out by that point. I grabbed a crank off of CL and had it polished, pistons and rods used off of Fleabay, new bearings and gaskets, honed in my garage, all in for about $800. That motor is still in and healthy, has been good and made good numbers. It's getting replaced by an LS. While the rest of the crap is an asspain to hunt down cheap, the motor itself was $220 from the pull and pay for an aluminum LM4. Gotta find another for a spare. 170k and I'm not doing anything to the bottom end. Got a late LS1 cam for free fiddy to pop in there and that's it. I don't believe in machine shop engines for these cars when stock seems to last just fine.
RM CMC Director
Leave the ls1 cam alone.
An lm4/lm7 as is with some work on intake exhaust restriction is all you need.
If you throw the ls cam in there you may have trouble getting the torque you need after choking the power down to get under the HP limit.
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