Owned for 4 days and cracked retainers.
08-09-2011, 07:15 AM
#23
Moderator
I have other news for you...those retainers have been split for many thousands of miles. I'm estimating about 20k miles. I've found this on 17 different cars in all phases of damage.
Your current over-rev didnt split the retainers, they were split a long time ago.
It takes 10,700 rpm to bend valves on a healthy engine.
With retainers that bad, you could easily bend them under 10k rpm due to servere loss in spring return rate.
Your current over-rev didnt split the retainers, they were split a long time ago.
It takes 10,700 rpm to bend valves on a healthy engine.
With retainers that bad, you could easily bend them under 10k rpm due to servere loss in spring return rate.
08-09-2011, 07:30 AM
#24
I have other news for you...those retainers have been split for many thousands of miles. I'm estimating about 20k miles. I've found this on 17 different cars in all phases of damage.
Your current over-rev didnt split the retainers, they were split a long time ago.
It takes 10,700 rpm to bend valves on a healthy engine.
With retainers that bad, you could easily bend them under 10k rpm due to servere loss in spring return rate.
Your current over-rev didnt split the retainers, they were split a long time ago.
It takes 10,700 rpm to bend valves on a healthy engine.
With retainers that bad, you could easily bend them under 10k rpm due to servere loss in spring return rate.
Billman, I had my retainers checked on my 2002 ap1 with 55k miles on the car. If the retainers were in good condition upon inspection and the engine isn't over-revved could these likely last well into the future for me ?, or is this just a failure of the materials that happens over time. I think since owning the car I've never even seen the 9000 redline, most I tend to take it to is 8000-8500 on a very rare basis ( no granny jokes please
). Any clarification on this issue would be great, thanks for reading.
08-10-2011, 08:31 PM
#26
There are shades of grey when it comes to a bent valve. None are good - but some are worse than others (obviously). A slightly bent valve may dynamically seal at certain RPMs and then leak enough to throw a CEL at others. The bottom line is a miss-fire = bent valve(s). I hate it for you.
I had a lower threshold over-rev several years back. I eventually drove up from Florida to have Billman change out the intake retainers (I was sick of inspecting the retainers for cracks). Luckily, the retainers only had stress marks (no cracks) - however, Billman changed the intake retainers out for me (AP2 retainers).
He's likely one of the most experienced, knowledgeable and skilled S2000 mechs/techs in the U.S. - certainly in the Eastern half of the country.
I had a lower threshold over-rev several years back. I eventually drove up from Florida to have Billman change out the intake retainers (I was sick of inspecting the retainers for cracks). Luckily, the retainers only had stress marks (no cracks) - however, Billman changed the intake retainers out for me (AP2 retainers).
He's likely one of the most experienced, knowledgeable and skilled S2000 mechs/techs in the U.S. - certainly in the Eastern half of the country.
08-10-2011, 08:45 PM
#27
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Billman is probably right because he is always right. I would suggest replacing the retainers because it's cheap and finding out anyway but Billman is right.
08-11-2011, 04:44 AM
#28
Moderator
A slightly bend valve will misfire at idle, because the piston is moving slower than a rate it takes to build sufficient compression to have ignition.
As the RPMs increase, the piston moves fast enough to build enough compression to have ignition (meaning igniting of the air-fuel mixture)
This goes for the s2k and any car that has a slightly bent valve. It will drive fine, for now...as you drive, combustion pressure is slipping past the valve, burning the valve and seat.
It will misfire at idle.
I have seen it on half a dozen s2ks with my own eyes
As the RPMs increase, the piston moves fast enough to build enough compression to have ignition (meaning igniting of the air-fuel mixture)
This goes for the s2k and any car that has a slightly bent valve. It will drive fine, for now...as you drive, combustion pressure is slipping past the valve, burning the valve and seat.
It will misfire at idle.
I have seen it on half a dozen s2ks with my own eyes
08-11-2011, 04:46 AM
#29
Moderator
08-11-2011, 04:50 AM
#30
Moderator
Billman, I had my retainers checked on my 2002 ap1 with 55k miles on the car. If the retainers were in good condition upon inspection and the engine isn't over-revved could these likely last well into the future for me ?, or is this just a failure of the materials that happens over time. I think since owning the car I've never even seen the 9000 redline, most I tend to take it to is 8000-8500 on a very rare basis ( no granny jokes please ). Any clarification on this issue would be great, thanks for reading.
). Any clarification on this issue would be great, thanks for reading.I have 117k on my 2003 s2k. I hit 9k all the time. I track, and drift, and autoX. Retainers are original. I check them every 20k or so. I refuse to change them as a test mule. I'd like to prove they cannot split without mechanic over-rev, so far so good.
So you are safe