Mauro

Of course, maybe he should get a hold of an 2004+ F20C2.

For science, you know .

Not even exclusive to S2000s, like the "AP2" coil packs. Which is good, as it brings the price down.

Mr.Matchbox

I think i will switch both sides.
If a retainer fails and the valve drops into the engine, the end is catstrophic. If a valve floats, it is repairable.

As a side note, i just have re-greased the shifter, makes changing and selecting the gears much more precise again. A little work that maybe avoid the catatrophic "Money shift".

clio

This is why I didn't change exhaust retainers:
The stock 99-03 intake retainers fail around 10,000 rpm.
The stock 99-03 exhaust retainers fail around 10,700 rpm.
Updated intake retainers lift the range to around 10,600 rpm.
So, by updating the intake retainers only the operating limit for the engine is 10,600rpm.

In changing the exhaust retainers there is increased chance of valve float, and no improvement to engine range (as the updated intake side is the weakest link).

rpg51

This.

Billman250

Exhaust valve-to-piston contact at 10,700.
AP2 retainers on the exhaust side will lower that number

Yes you can do it. And yes Honda put them in AP1s overseas (they are not going to continue to make AP1 retainers with the advent of the AP2 retainer)

All this matters ONLY in the case of a wrong-gear-mechanical-over rev.

In the USA, it seems everyone banks on this. Abroad, they bank on their ability to operate the car properly.

Mr.Matchbox

of course i bank on my abillity to drive the car properly. i am 47 years now and drive manuall all my life, never automatic, plus motorcycles. i think i know how to shift.

@ clio: the rpm number for the updated retainers on the exhaust side is missing?

Chuck S

Don't count on it!

-- Chuck

Mr.Matchbox

thats why i re-greased the shifter to get smooth, precise (!) shifts again. works really well.

Mr.Matchbox

sorry for maybe being annoying, but i am still curios: where are the rpm numbers for the exhaust valves with the updated retainers?

and what is the source for this rpm numbers? Honda R&D? Link?

edit: fail means the retainers start to crack, i guess. what are the rpm numbers for valve float?

clio

I doubt there would be any info from Honda when components fail above operating range, at least not in the public domain. The rpm figures have been quoted by Billman in a number of threads. I think many on this forum, including me, take his info as gospel on all things S2K.