2013 Boxster S 6MT: what is it worth?
03-02-2018, 03:54 PM
#31
So, at least to me, a few over-revs are not an issue. Especially if there is a warranty coverage for a few years like you have for your car. If past over-revs actually damaged the engine, the symptoms should appear relatively soon: within the warranty period
In terms of warranty coverage, it's unlikely that the manufacturer will honor a warranty when there are over-revs in range 4 or higher. This is just anecdotal but I'm aware of one case were Porsche initially denied coverage for engine damage and there were just range 1 and 2 over-revs, but there were numerous instances of these over-revs. Eventually Porsche compromised and covered the material costs, but not the cost of labor.
03-02-2018, 04:50 PM
#33
Rennlist Member
When you state " a few over-revs" I assume you mean a few instances of over-revs, since each instance is likely to cause over 100 ignitions in an over-rev range, even if you are just bouncing off the rev limiter. Of course it will be many more for a missed downshift. I agree that catastrophic engine damage will likely occur quickly with over-revs in range 5 or 6, but it could occur much later, especially when the engine is stressed again with even range 1 or 2 over-revs.
When a 6-cylinder Porsche engine makes 9000 ignitions per minute at mere 3000 rpm (3 pulses per revolution), how significant is 100 ignitions? If an engine made 300 ignitions in, let's say, range 4 (I believe it's >7900/<8400, correct me if I'm wrong), it made 100 revolutions. At 8200 rpm for example, the engine only spent 0.73 second at that speed. If something like this actually caused catastrophic engine damage, Porsche would have gone out of business years ago. Again, YMMV.
03-02-2018, 05:11 PM
#34
Just one and it happened two years ago.. A friend of mine had a Corvette and missed a downshift. He exceeded redline by almost 2K RPM. We expected the worse but the engine ran fine and after a couple of months he thought that he dodged a bullet. So about seven months after the incident, he took his car to a dragstrip and the engine died at the track while he was making his run. Unfortunately for him, GM denied his warranty claim because of the over-revs.
03-02-2018, 05:19 PM
#35
Rennlist Member
Just one and it happened two years ago.. A friend of mine had a Corvette and missed a downshift. He exceeded redline by almost 2K RPM. We expected the worse but the engine ran fine and after a couple of months he thought that he dodged a bullet. So about seven months after the incident, he took his car to a dragstrip and the engine died at the track while he was making his run. Unfortunately for him, GM denied his warranty claim because of the over-revs.
03-02-2018, 05:30 PM
#36
Yes, I meant "a few instances of over-revs". Thank you.
When a 6-cylinder Porsche engine makes 9000 ignitions per minute at mere 3000 rpm (3 pulses per revolution), how significant is 100 ignitions? If an engine made 300 ignitions in, let's say, range 4 (I believe it's >7900/<8400, correct me if I'm wrong), it made 100 revolutions. At 8200 rpm for example, the engine only spent 0.73 second at that speed. If something like this actually caused catastrophic engine damage, Porsche would have gone out of business years ago. Again, YMMV.
When a 6-cylinder Porsche engine makes 9000 ignitions per minute at mere 3000 rpm (3 pulses per revolution), how significant is 100 ignitions? If an engine made 300 ignitions in, let's say, range 4 (I believe it's >7900/<8400, correct me if I'm wrong), it made 100 revolutions. At 8200 rpm for example, the engine only spent 0.73 second at that speed. If something like this actually caused catastrophic engine damage, Porsche would have gone out of business years ago. Again, YMMV.
You are certainly entitled to your views, but here's an excerpt from a Porsche technical manual: When the engine rev limiter is exceeded the engine can fail or be damaged leaving it susceptible to future failure. Instant failure would normally be caused by valves hitting a piston. Subsequent or delayed failure is often caused by a compromised timing chain which can be weakened or stretched at high engine speeds. If a timing chain were to be excessively stretched failure is possible due to the abrasive effect of a slack chain against the sprocket teeth on which it runs.
03-02-2018, 05:31 PM
#37
Rennlist Member
This whole discussion started with someone's question whether skipping an over-rev report before buying a car is a mistake. I think the answer should be clear by now.
03-02-2018, 05:38 PM
#38
Rennlist Member
Don't know if the wording has changed but the last over-rev report I read stated that over-revs in range 4 could cause engine damage, 5 was likely to cause engine damage, and 6 was virtually certain to cause damage. If a valve hits a piston during the over-rev, the damage will be instantaneous.
You are certainly entitled to your views, but here's an excerpt from a Porsche technical manual: When the engine rev limiter is exceeded the engine can fail or be damaged leaving it susceptible to future failure. Instant failure would normally be caused by valves hitting a piston. Subsequent or delayed failure is often caused by a compromised timing chain which can be weakened or stretched at high engine speeds. If a timing chain were to be excessively stretched failure is possible due to the abrasive effect of a slack chain against the sprocket teeth on which it runs.
You are certainly entitled to your views, but here's an excerpt from a Porsche technical manual: When the engine rev limiter is exceeded the engine can fail or be damaged leaving it susceptible to future failure. Instant failure would normally be caused by valves hitting a piston. Subsequent or delayed failure is often caused by a compromised timing chain which can be weakened or stretched at high engine speeds. If a timing chain were to be excessively stretched failure is possible due to the abrasive effect of a slack chain against the sprocket teeth on which it runs.
03-02-2018, 06:01 PM
#39
With all due respect (code for I don't want to engage in a pissing contest) that subsequent failure could have been, and probably was, caused by things other than damage initiated by those prior over-revs. I'm certainly no authority here, though, and would welcome many of you other more knowledgeable guys chiming in and explaining how damage caused by over-revs could manifest itself far down the road mileage-wise. I'm sure it's possible. But certainly not typical. That's why dealers are instructed to ignore over-revs beyond a certain mileage range when it comes to warranty coverage and CPO certification.
The following is Porsche's current CPO policy: Current Porsche warranty procedure ( as of 2017) considers activity in ranges 3 and 4 to be potentially problematic with compression tests and / or oil checks deemed necessary irrespective of whether or not incursions occurred several hundred operating hours prior to the check. However, in a pragmatic relaxation of previous protocol vehicles with activity in ranges 5 and 6 will be considered for extended warranty provided the over rev activity occurred more than 200 operating hours ago. The warranty provision is at the discretion of the importer and subject to the aforementioned compression/oil checks.
..
03-02-2018, 07:17 PM
#40
Rennlist Member
The following is Porsche's current CPO policy: Current Porsche warranty procedure ( as of 2017) considers activity in ranges 3 and 4 to be potentially problematic with compression tests and / or oil checks deemed necessary irrespective of whether or not incursions occurred several hundred operating hours prior to the check. However, in a pragmatic relaxation of previous protocol vehicles with activity in ranges 5 and 6 will be considered for extended warranty provided the over rev activity occurred more than 200 operating hours ago. The warranty provision is at the discretion of the importer and subject to the aforementioned compression/oil checks.
All I am saying is that a few instances of over-revs for brief moments shouldn't be an instant deal killer. Cars that has been raced or extensively tracked are totally different matter. I will stay away from those at all costs.
03-02-2018, 08:19 PM
#41
Am I reading this correctly? Even if "range 5 is likely to cause engine damage and 6 is virtually certain to cause damage", if nothing bad happens in 200 operating hours after hitting range 5 and/or 6, the car will still be considered for CPO. Couldn't this mean that even hitting range 5 or 6 wouldn't necessarily be a certain death sentence?
All I am saying is that a few instances of over-revs for brief moments shouldn't be an instant deal killer. Cars that has been raced or extensively tracked are totally different matter. I will stay away from those at all costs.
All I am saying is that a few instances of over-revs for brief moments shouldn't be an instant deal killer. Cars that has been raced or extensively tracked are totally different matter. I will stay away from those at all costs.
03-02-2018, 08:36 PM
#42
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No dealer would offer to buy this car for $37,500--that's BS. Wholesale, it's worth maybe $33,000. Top price for a private sale would be around $37,000. The Porsche dealer in Nashville has a nice '13 Boxster S for $39,500---asking price. And this is CPO!
03-02-2018, 08:48 PM
#43
Rennlist Member
I don't entirely agree with those statements. Honda says that unless their cars burn more than a quart of oil per 1,000 miles, the car is operating normally. Others have disagreed and punished Honda for it. And rightfully so. Auto manufacturers take ridiculous positions against consumers every single day and if the only relevant position was that of the auto manufacturers we would all be in trouble.
Last edited by SpyderSenseOC; 03-02-2018 at 10:39 PM.
