[Wayne Davis]

Because of the difference in “STOCK” piston configurations between the Ecotec 2.4 LE5 flat top 10.5:1 compression ratio and the other engines that are currently allowed in D-2 racing, are at lower compression, the Gator Dirt Nationals sanctioning body sees the need to allow all engines to run a “Flat Top” 4 eyebrow piston, stock or aftermarket, so no 1 engine has a compression ratio (HP) advantage. This also will help ease any piston tech issues by pulling a plug and looking with a scope.

Case in point:

LE5 Ecotec 2.4 L - 2,384 cc (145.5 cu in) Flat Top piston
2006–2009 - Saturn Sky - 177 hp @ 5800 rpm - 173 lb·ft @ 4800 rpm - Comp: 10.5-1 - Rev Limit: 7000 rpm

Honda 2.4 L - 2,354 cc (143.6 cu in) Dish piston
2005-2006 - Honda CR-V - 156 hp @ 5900 rpm - 160 lb·ft @ 3600 rpm - Comp: 9.6:1 - Rev Limit: 6500 rpm

Ford: 2.3 L - 2,261 cc (138.0 cu in) Dish piston
2001–2011 - Ford Ranger - 164 hp @6000 rpm - 144 lb·ft @ 4000–4500 rpm – Comp: 9.7:1 - Rev.: 6500 rpm

Chrysler: 2.4 L - 2,360 cc (144 cu in) Flat top piston
2013- present - Dodge Dart - 184 hp @ 6250 rpm - 174 lb·ft @ 4800 rpm - Comp: 10.0-1 – Rev.: 6800

Toyota: 2AZ-FE - 2.4 L 2,362 cc (144.1 cu in) Dish piston
2002–2011 Toyota Camry - 160 hp @ 5600 rpm - 162 lb·ft @ 4000 rpm – Comp: 9.6:1 Rev.: 6500

GM Quad 4: 2.4 L - 2,390 cc (146 cu in) Dish piston
1988–1994 - Pontiac Grand Am - 150 hp @ 5600 rpm - 155 lb·ft @ 2400-4400 rpm - Comp: 9.7:1


This is "NOT D-2" making this change.... this is for the Gator Dirt Nationals

complete rules at www.ssmidgets.com/gd-nationals.html

[badcoupe]

Way to try to keep things even Wayne.

[Wayne Davis]

Originally Posted by badcoupe Way to try to keep things even Wayne.

just to clearify:

We will pull a spark plug and look at a piston when we do the saftey check prior to racing....without that safety decal you will not get on the the track. It will be up to each racer to come to tech to clear their car before they will be allowed to compete.

[latemodel55]

I agree!!! Need to keep everything in line with the rest of the organizations.

[DAD]

Had the rule makers been smart they would have made pistons optional and aftermarket rods dis allowed. Stock compression engine are a little short in the compression department to see any gain from Methanol and perhaps a small drop in power when compared to gasoline. Stock rods with better bolts should suffice if the RPM's are kept in check.

You are doing just fine Wayne>>>>>>>>>>>>>>>>>If you check your specs each year compression goes up and so does Horsepower (interesting), note to racer always run a late model STOCK MOTOR. Cheaper than rods or pistons and runs just as good or better.


Honest Dad himself

[Wayne Davis]

Originally Posted by latemodel55 I agree!!! Need to keep everything in line with the rest of the organizations. It's a shame that Wayne won't follow the majority. Only going to hurt him in the long run.

thanks for your opinon Todd Lehr

[latemodel55]

Anytime!! Wayne Davis

[Davis33]

I believe Wayne has started the first part of a good thing in going to a standard flat top piston stock or aftermarket which is easy to tech in this division. The next step to even equal it up even more is to have a standard compression ratio rule of 11:1 for all engines that would allow the methanol to burn efficiently. There is a tool that can check this by simply removing the spark plug and placing cylinder at top dead center which is also very quick to do. Remember all this is in the evolving stages and this is happening to lower the cost of engines and to have them run longer thus lowering the budget it takes to maintain an engine and to have everyone on a level playing field. Put the race back into the racer instead of cubic dollars. Another area that would help is to limit the size of injectors to a spec which again is easy to tech, the ones that are larger than the spec would run a restrictor which is easy to tech. It may end up one brand of an engine to another may require or be allowed to run a different size injector to equal them up more due to the stock ports and air flow. It's a balancing act, you need certain spec criteria's that control the cost while keeping things even between all brands of engines but yet is easy to tech so know one has to disassemble their engine to verify their legal. The ground work has been laid just may need a little refining.

Jeff Davis