BC IS RIGHT , RIGHT ABOUT THE RINGS AND THE OIL DRAIN BACK HOLES IN THE PISTONS, STARTING IN98 ON THE 3.2 AND THE 3.5 ENG ISUZU WAS TRYING TO GE TTHE SLIDIGN RESISTENCE ON THE PISTON DOWN ON THE NEWER ENGS LESS RESISTENCE ,MEANS MORE POWER AND BETTER MILEAGE SO THEY MADE THE PISTONS WITH THE RINGS SPECIFICALLY THE OIL CONTROL RINGS SMALLER IN THICKNESS AND ON THE PISTONS RING LAND THEY ONLY DRILLED TWO DRAIN BACK HOLES IN EACH SIDE OF THE PISTON, IN THE LAND ITSELF, FOR THE GUYS WHO MAY NOT COMPLETELY UNDERSTAND WHY WE EVEN NEED HOLES IN THE LANDS AT ALL, PIX THIS EVERYTIME THE PISTON IS AT TDC IT IS EITHER BEING PUSHED DOWN BY THE FIRING OF THE CYL ON IT S POWER STROKE OR IT IS BEING PULLED DOWN BY THE CRANKSHAFT ON THE INTAKE STROKE , SO WHERE DOES THE OIL COME FROM ON THE CRANKSHAFT ROD JOURNAL THERE IS A HOLE DRILLED TO ALINE WITH A HOLE THAT IS DRILLED ON AN ANGLE IN THE CONNECTING ROD ITSELF THAT GOES ALLTHE WAY THRU AND EXITS RIGHT ABOUT ONE OF THE ROD BOLTS, , NOW THIS HOLE IS DRILLED AND ALINGHED IN SUCH A WAY THAT IT CAN ONLY SQUIRT OIL ON THE CYL WALLS AS THE PISTON IS COMING DOWN FROM TDC AND ONLY ON THE MAJOR THRUST SIDE OF THE PISTON, WHICH IS THE INTAKE SIDE OF THE PISTON THAT IS WHY YOU HAVE THE LISTONS WITH FRT MARKS ON THEM AMONG A COUPLE OF OTHER REASONS . NOW WITH ALL THIS OIL ON THE CYL WALLS AS THE PISTON DECENDS THE RINGS JOB IS THE SCRAPE THE OIL FROM THE CYL WALLS EXCEPT FOR A MINUT AMOUNT THAT IS USED TO LUBRICATE THE PISTON TO CYL SO THE PISTON DOESNT STICK TO THE WALL ALUMNIUM AND CAST IRON DO NOT GET ALONG VERY LONG SCRAPING AGAINST EACH OTHER , SO NOW GO PAST A COUPLE OF OIL CHANGE AT THE OIL CHANGE PLACE OR GET A LOW GRADE OF OIL THREE OR FOUR TIMES AND IN ABOUT 50 000 MILES THE CARBON AN D GUNK WILL START TO BUILD UP IN AND AROUND THE RINGS AND THE RINGS EITHER STICK OR COMPLETELY COLLASPE AND CAINT CONTROL THE OIL SO IT JUST SLIDES RIGHT PAST THE RINGS INTO THE COMBUSTION CHAMBER , ANY GOOD GRADE OF OIL CAN PREVENT THIS FROM HAPPENING, BUT ONCE THE CARBON HAS BUILT UP IT CONTINUALLY GETS HARDER AND HARDER UNTILL THE RINGS CAN NO LONGER WORK, ,WHAT IS THE CURE GO TO A HI DETERGENT OIL OR MAYBE AN ENG FLUSH WHICH USUALLY DOESNT WORK, AND KEEP DRIVING UNTILL THE CARBON STARTS TO BREAK DOWN, AND LET THE RINGS START DOING THEIR JOB AGAIN, THIS CANNOT AND WILL NOT HAPPEN OVERNITE OR IN ONE OR TWO OIL CHANGES IF TI DOES YOU DONT HAVE CARBON BUILD UP YOU HAVE A SLUDGED UP ENG, NOW THE ENG FLUSH WILL DISSOLVE THIS CRAP, BUT CARBON TAKES A WHILE . THE ROTELLA OIL CANNOT CREATE MIRACLES , BUT IT DOES CLEAN THE ENG, BUT IT COULD TAKE 8-10 OIL CHANGES , AND THAT IS QUITE A BIT OF DRIVING, NOW WHAT ISUZ DID ON THE LATER ENGS PRODUCED STARTING WITH THE 2002 ENGS WAS DRILL 4 HOL;ES FOR DRAIN BACK IN THE PISTONS , SO FAR THEY SEEM TO DOING THE JOB, THE PROBLEM ISUZU RAN INTO IN THE DESIGN OF THE NEW ENG WAS THEY WANTED TO KEEP THE PROFILE OF THE ENG SMALL YET MAKE IT LARGER INTERNAL, SET THE LATE 3.2 SIDE BY SID E WITH THE LATE 3.2 3.5 AND THERE IS A LOT OF DIFF IN THE HEIGTH OF THE ENGS, THEN WITH THE STROKER CRANK OF THE 3.5 THE PISTONS HAD TO BE MADE SHORT BY QUITE A BIT TO FIT IN THE SAME DECK HEIGHT THAT THE PISTON PIN HADE TO BE MOVED WAY UP IN THE PISTON AND THE SKIRT WAS SHORTENED BY ALLMOST A 1/2 INCH, TO KEEP FROM HITTING THE CRANKSHAFT , THE OLDER ENGS HAD 4 MM WIDE OIL CONTEL RINGS AND ALLSO HAD 4 VERY LARGE DRAIN BACK HOLES ON EITHER SIDE OF THE PISTON, THE LATE ENGS HAD A 3MM WIDE RING THATS NOT EVEN AN EIGHT OF AN INCH,
HOPE THIS CLEARED IT UP A BIT, BUT DONT THINK THERE ARENT OTHER VEH OUT THERE THAT HAVE GONE THRU THIS, THERE IS ONE BRAND OUT THERE THAT BUILDS SO MUCH BETTER TRUCKS THAN THE RODEOS AND TROOPERS THAT THEY EVEN DESIGNED THE ENGINES AND THE TRUCKS BEFORE ISUZU EVEN SOLD THEM THEIRS , HMMM WONDER WHO THAT COULD BE TROOPERS 92 ACURAS SLX 95 RODEOS 93 PASSPORT 94-95 WONDER IF THEY WOULD REMEMBER ALL THE CIVICS IN THE EARLY TO LATE SEVENTYS WITH THE BROKEN EXHAUST MANI, BURNED VLV, BLOWN HEAD GASKETS, SEIZED CAMSHAFTS , LEAKING ENG CORE PLUGS , I BETTER NOT MENTION THE NAME OF THOSE THEY MIGHT GET MAD AT ME HEHE JERRY
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