What's wrong with achieving top speed? I've tried in most of the cars I've owned. And it doesn't take 10 or 15 minutes...

Obviously Honda agreed because they updated the bolts. They could've put a lame nanny speed limiter on the car instead.

 

Well there is a speed limiter on our car ... it is lack of power aka drag lol.

I just shy away from running those speeds on public roads. Hard to find one that is actually long enough and safe enough. On the tracks I have been on so far, this car NA is only going to get into the mid 120's. T1 - T2 (which is more of a long bending WOT section) at BIR mine with the APR wing can reach a bit over 120 (reads higher on the speedo but it is a tad off at those speeds). A similar setup S2k without a wing was hitting a bit over 125 there, both with a really solid entry/exit on the preceding corner. there are some tracks though that people are hitting higher speeds on NA but not sure any getting up to top speed.

 

It´s nothing wrong with achieving top Speed. I also have done it with every car and Motorcycle i had, often. But none of these engines had the crazy high piston speed of the S2000. I was allways told that a car engine should not exceed 16 Meter per second piston speed and Motorcycle engines 20 Meters / Second Piston speed. The later ones was regarded as "Racing engine" territory. The Honda S2000 AP1 reaches 25 Meter / Second Piston speed. That´s crazy high! I read that this is higher as in some F1 racing engines.

What happens inside a engine? The pistons moves up and down. But: The piston allways comes to a complete stop on the uper and lower ends of the move. (Tod dead center / Low dead center) It stops, accelerates again on his way through the cylinder, slows down, stops, accelerates ... and so on... two times per revolution of the crankshaft. With a redline of 9.000 RPM at the AP1, this means that every piston stops 18.000 times per minute. Try to imagine this.
And now.. If you stop a moving piston, a leightwhigt piece of aluminium, ho many Kilogram or Pounds of force does this piston create wich pulls or pushes at the Piston Rod?

Here at around 15 Minutes:
And here from the 12:30 Minutes:

On a F20C Engine, a piston pushes or pulls with a force of 2280 Kg = 5026 lbs on every end of the stroke. Of course, the engine is balanced, and there are allways two pistons going up and two down to equalize the forces, but you can not get perfect balance form the factory and espiacly on a engine with this high piston speed. That´s why the S2000 also have the problem of vibrating the oil filter loose.

At 9000 RPM, two pistons going up, two going down, that´s 4560 Kg or 10052 lbs of force on the daed centers of the stroke 18.000 times per Minute = 300 times per second.

Little bit of stress for the crank, the bearings, the rod, isn´t it? And a lot of friction wich needs oil. But it is perfectly fine doing this with this engine, because usually you accelerate, reach redline, shift. The engine only spins for a second above 8000 RPM. On the autobahn, trying to reach top speed, is a different thing. Becaus you press the pedal to the floor and in the 6. gear, the car slowly accelerates. So you sitting in the car, Pedal to the floor, for minutes and accelarates slowly towards redline 9.000 RPM. That is to much stress for this particular engine. It´s not the speed, it´s not the RPM, its only the duration, the time how long you are in the high RPM range with the pedal to the floor wich kills the engine.
Some people here wrote that you should not longer as 30 Seconds drive the engine near redline. And i belive it.

I hope my explanation is understandable. I dont have a degreee in Engineering. If something what i wrote is wrong, please correct me.

 

The banjo bolt upgrade is needed for:

-sustained high speed operation (completely different than track)

-forced induction

If you pull just the oil pan, you can check the bolts with a mirror (the head of the new bolts are near twice as tall)

I have found the new style bolts in engine number 1025232 (154 away from the original 1025386)

Documented on Jacko of s2ki, original owner)

 

Great write up. I do not recall the specifics (of AP1 or AP2) but I read somewhere there was a Honda limit (not found in the manual) of 25 seconds or so WOT in ANY one gear. I thought it was for oil starvation so it could be related to the banjo oil bolts.

 

That's almost 1 mile at 120MPH. A long distance!

You'd need to be on a dry lake bed.

 

For me, living on the Sierra Nevada slopes, I envision hitting that while storming up a hill in a lower gear but still at WOT in a stabilized attack angle. Still seems like a long time. We only had 8 seconds of inverted flight on some Navy jets.

 

After thirty seconds of inverted flight, you'd probably be hitting something hard, That is a long time at maximum engine speed.

I've only continuously done max RPMs for 30-60 seconds was on my dirt bike during long hill climbs or dry lake beds.

 

Except a stock AP1 will only do about 150-155 MPH, which is around 8000 RPM in 6th. Still a pretty high piston speed! (22.4 m/s at 8000).

I'm glad to be aware of the early AP1's limitation in this regard (since I have one). I'll make sure to update the banjo bolts before attempting any top speed runs

 

THIS is what I was looking for!!!! Thank you!! The Canadian production was jokingly low...so my thought would be a low engine/VIN number would be completely out of context with a USA engine/vin.

A few years back I passed on another 2002 with low mileage...because the vin was low. I was looking for something in the mid 5000's thinking it followed suite with the USA cars. Darn lol.

I had the dealer send me the door jamb decal...build date is May 2022! So looks like this one would be good to go with the updated banjo bolt, correct?