zeroptzero

Yeah that is a good point Billman250, a little bit of cooling on deceleration may just be enough.

I've always wondered why cylinder 4 was more likely to scuff than the others though, you would think cylinders 2 or 3 would run a bit hotter than 1 or 4.

Billman250

Yeah I wonder that too...some thought because it was last in the row when it comes to oil jets...

I wonder if there is a factory defect in the positioning of the number 4 jet.

The way it works, the oil jet sprays oil up under the piston. On the down stroke, the oil flattens out the spray (like in the cartoons when they sit on top of a water spout ) and it sends the oil through feeder holes in the piston to lubricate the piston skirts and cylinder walls. I wonder if the oil is not passing through these holes in the number 4 cyl as well as the others. I believe the new bolts affect the pressure, which in turn affects the spray pattern, so the pistons can flatten out the pattern on the down stroke differently. You know, it changes the aim of the oil whan all said and done.

Bottom line, I would change them for certain. This was a RECALL (not a tsb) in other parts of the world.

2002 S2000

Are you recommending that we change them even not we stay stock? Also, is their a VIN range or build date when we know they were updated?

TougeS2k

FML.. Will the stealership do it for a resonable price since its a TSB?

zeroptzero

Nope. Honda North America won't even discuss the issue, they will replace them at your cost though.

Too bad you don't live near Billman250.

Billman250

It is not a TSB, once again.

I only recommend it for FI, or if you plan on high speed runs where you would keep the accelerator to the floor in 5th or 6th gear for long periods. 30 seconds or more. Thats a long time, thing about it Basically sustaining 140+ Mph for extended time.

trAP2

Is this a problem with all ap1s or did 2003 get upgraded bolts?

starchland

this would also reflect why it was an issue only in Europe according to Honda, where sustained high speed driving like the autobahn is more common.

anyone selling a set?

just a mental note - 3 things to make my 2000 f20 'honda bulletproof'
-updated oil jets
-never over-rev
-always check oil
-TCT

2002 S2000

Do we know what month of 2002 model year production the newer bolts were used? Mine was produced in March 2002.

Billman250

Goes by engine number, not production month.

Changeover was in mid 2002, 1025386 was once the engine number we went by, but then JFUSION found a earlier number by a hundred or two. i too have found the new bolts in earlier numbers. If you are over this number, you can say you already have the new bolts.

So, the only questionable year is 2002. Post your engine number, its on the left front of the block near the head gasket. Get a penlight.