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Mitsubishi 4G6: 1989-1999 Eclipse and Talon Turbo, 1989-1994 Non-Turbo

The stock engine components in the Mitsubishi 4G6 Turbo engine are exceptionally strong.  This durability, even when the power is turned up, is a large reason why the Mitsu is so popular among those desiring increased power.  Instances exist of completely stock engines running at 450HP with the right components!  While it is possible, it's not always a given that stock engine internal components will endure this type of strain at 400+ HP without mishap.  Even though the stock Mitsu parts are most excellent for stock components, they do have their limits.  Three primary areas, which can be improved for high HP durability, are:

1. Stronger, less brittle forged pistons instead of stock cast pistons.  Stock cast pistons are unforgiving to detonation, a condition which can cause them to crack easily.

2. A stronger connecting rod, precision machined from billet, manufactured to very stringent tolerances.  A con rod failure is to be avoided, as it is always spectacularly destructive to the engine.

3. Eliminating variables of stock production tolerances.  This is the hardest area to control, or even predict the possible outcome.  Although those stock pieces are great, they are still only produced to tolerances of acceptable standards for a 200HP engine.  This means that you may get weaker parts than the next car, or you may get lucky and get stronger ones.  But you just won't know which!  This is why we see occasional, but not widespread, problems in stock engines producing 350HP or more.

These factors point out the benefits of replacing the stock components with heavier duty pieces better designed for the task at hand.  If you are building a 350HP or more engine, give these pistons and rods serious consideration.  They give excellent durability as well as peace of mind.  The cost of replacing one broken engine will far outweigh the cost of these components.  And even if you are rebuilding an engine in the 300 to 400HP range, oversize pistons and reconditioned connecting rods will be required, so why not get an edge in durability at the same time.

CROWER CONNECTING RODS These Crower Billet connecting rods are small pieces of mechanical art.  Finished to the industry's most exacting standards, they can withstand all you can dish out.  Precision machined from billet 4340 chromemoly steel.  Small end bushed for floating piston pin.  H11 tool steel rod bolts.   Balanced and sold in sets of four.  Have you ever seen what a connecting rod failure can do to an engine?  It ain't pretty, and can truly destroy an entire engine.  Don't take chances with your investment.  If you plan to see 350+ HP on a regular basis, build your next engine with these rods.  Don't settle for the unpredictable manufacturing tolerances of stock rods.

420A Chrysler: 1995-1999 Eclipse and Talon Non-Turbo and others

We have been evaluating the 420A engine in turbocharged form since early 1998, and have already produced almost 400HP with our Stage III systems on this excellent powerplant.  The stock engine will handle up to 275HP wthout incident.  Our stock engine prototypes have withstood tens of thousands of road miles and high performance use and looked fabulous internally when disassembled for inspection. 

But you need not be limited to only 275HP.  When rebuilding the engine or preparing it for over 300HP use, the use of these forged pistons and billet connecting rods is a must.  The stock powdered metal rods in these engines are excellent but will not safely withstand repeated use over 300HP.  The stock pistons are high quality Mahle units, but can be improved upon with forged pistons if high HP is your goal.  The durability these components add is all you need to do to this exceptional engine to prepare it for 400HP use.  Hahn Racecraft's World's Quickest Neon engine is completely stock other than these pistons and rods: and he's already run 11.80's with his Stage III Turbosystem equipped Neon! Yes, the remainder of the engine is completely stock, even the throttle body.  No porting, cams, nothing: we didn't even take the manifolds off the cylinder head when we installed these pistons and rods. And he still drives it regularly on the street.  This makes the DOHC 420A ecomomical for high HP use.  And any competent mechanic and engine rebuilder / machinist can install these heavy duty components with excellent results, without limiting the car's potential for daily street use.

CROWER CONNECTING RODS

These Crower Billet connecting rods are small pieces of mechanical art.  Finished to the industry's most exacting standards, they can withstand all you can dish out.  Precision machined from billet 4340 chromemoly steel.  Small end bushed for floating piston pin.  H11 tool steel rod bolts.   Balanced and sold in sets of four.  Have you ever seen what a connecting rod failure can do to an engine?  It ain't pretty, and can truly destroy an entire engine.  Don't take chances with your investment.  If you plan to see 350+ HP on a regular basis, build your next engine with these rods.  Don't settle for the unpredictable manufacturing tolerances of stock rods.

205 Beaver Yorkville, IL 60560 (630)553-6830 sales@turbosystem.com