RT

.... and some are extremely poor ones

wingle69

You had a word for that ... But I forgot already. We were busy trying to spot the pedo smiles. LOL

Djeenie

Hi folks,

A couple of weeks ago I had an overrev with my S2K. Shifted into 2nd instead of 4th at around 120kph (~74mph). At the moment the clutch was released I could still see 114kph on the speedo (~71mph). So I think the engine must have hit something between 9500 - 10000rpm for a split second.

After reading all the threads and posts about overrev I took the cover off to have a look at the retainers. As far as I can see, the most commonly found cracks go in a radial direction (i.e. in a direction from the center towards the outside) and are found on the base of the retainer (the section that surrounds the valve stem).

But has anyone seen these types of cracks? They are located on the outer edges of the retainers. I found them on both intake and exhaust side. About 8 retainers have them.

My S2000 is from 2005 and has the F20C engine. It has done just over 50k km's.

Should I be worried?

Intake side


Exhaust side


Exhaust side, crack on right retainer

mikegarrison

It's hard to tell for sure from these photos, but I think what you are seeing are tooling marks or grain boundaries, not cracks. The cracks would be forming on the underside. That's where the stress is when the valves float.

Djeenie

I guess I'll have to take the retainers off to have a proper look? But then there is no extra effort to replace them anyway.

By the way, maybe I should have posted this in the Under the Hood section?

blacknwhite

i would be wondering why your 2005 has a f20c.......

D Grade

^^Word^^^

Well since retainers seems to be an issue in atleast the F22, whats the preference for upgrades? Im the type of guy who likes to upgrade rather than replace when something goes bad. Might as well upgrade the valvetrain so you can rev higher without worry.

bahula03

If you do a bit of reading in under the hood, F22 retainers are substantially beefier than F20 retainers (and are generally considered an upgrade for the F20). I'm sure titanium retainers will come up in this thread at some point, and those are peachy...if you're good with replacing retainers every ~40k or so


As much as I hate to go with the Jerry tagline of, "what Honda designed for this car is way, way beyond what you're actually using it for," that's the truth here*





*assuming the car is driven properly- from my reading, mechanical over-revs are infamous for cracking retainers

s2000Junky

Actually you have it backwards. The f22 retainers (and keepers which also can crack) are better able to withstand higher rpm over the f20's. From the top end standpoint, unless your planning on revving the f22 to 9500+ ...no upgrades are needed. My oem f22 sees 8900 rpm regularly. The motor has aprox 80k on it currently.

yals

I bounce my car off the rev limiter all the time, like a baller!