htny

My P sees 7200 at least 4 times a day (53K on the clock now), same for the MB (6K but large displacement v8, 85K miles trouble free over 9 years) and the BMW (6800 Straight 6) whenever I drive them. If that bites me in the *** someday at least I enjoyed them.

They are maintained by dealer while under warranty, me after that, get oil when it starts to smell, never leak a drop of it any of them, and they all run like sewing machines so far. This is in high density urban environs.

I'm not advocating the "keep it over 4K" nonsense, that's plain craziness and will absolutely cause undue stress (that's continuous load, which requires very different design considerations in a reciprocating motor), but you need to open that throttle up a few times a day and wind it up to redline.

I will NEVER understand people who baby commodity vehicles to the extent of short shifting, OK I understand on an original 550 Spyder, but it's inexcusable on a modern 911. If it breaks, you can fix it, or insure your risk. Have fun out there.

I do however avoid potholes like a retiree.

Jake Raby

The majority of the phone calls I field come from Drivers that state that they were driving 55-60 MPH when the incident occurred that took them off the road and drained their wallet.

And I have been able to data log and observe why this is..

I log details of every phone chat I have with those who have experienced engine failures.. In 3-4 more years we should have enough trend data to substantiate a rather wild hypothesis that would be met today with vast opposition.

This year I have had two calls from thos who have experienced IMS failures on the track, I have had more calls than that from those that have experienced broken crankshafts during track activities.

Last week alone I chatted with 6 drivers that experienced IMS failures while on the street.. Two more today that occurred over the weekend.

knfeparty

Recent shop visit had a C4s that had an IMS failure. It had been sitting for an entire afghanistan deployment and failed pretty much as soon as he started driving it again.

My 325Ci gets redlined pretty much every shift and 6.5 years and 104k miles later it still runs like new. Uses a little bit of oil mind you but it runs clean! You have to drive that car like that because it is so slow, though.

Jake Raby

One of my test cars saw 74,000 in range one and 53,000 rev counts in stage two before I pulled it's IMS bearing and retrofitted it earlier this year..

That bearing was in near perfect condition.. After I'd sometimes drive it 5 miles in second gear against the (elevated) rev limiter at 7,700 RPM.. I fired it up on a 9 degree morning and held it WOT for 11 minutes solid.

My Wife drove it to work today.... Its one of the best running M96s I have ever experienced.

But if I blow an engine its a tax write off and a true learning experience..

ivangene

so you agree with the OP's statement Jake? (with a grain of salt)

I posted over the last year that I like to run in lower gears and keep the RPM's higher... some laughed, but I have owned many bugs and found them to run much better if I kept the rpm higher and the low rpm "pulls" to a minimum... seemed like running faster and smoother was eairer on them than running slower and kind of what I considered to be "lugging" -

peavynation

Wow! I liked hearing that. My P car had 50k range 1 events in the computer, but no range 2. I'm hoping that that helped it out.

At clutch time, I'm going to pop in one of the LN/Flat6 bearings just to be on the safe side.

Jake Raby

Cool..

I won't directly concur with what the OP posted, because as soon as I do I'll get emails and PMs stating that more RPM can never mean less wear.

In my 996 I don't use 6th gear till 75 MPH and don't use 5th in my Boxster until I can maintain above 2,800 RPM.

ivangene

fair enough - thanks

Darren

I think it's interesting that this suggests that 15,000 mile oil changes were stupid.

AndyK

Ha! "Don't you know this car is a ticking time bomb! If I slow down below 55, it'll blow!!"

Jake Raby

No matter how often you change the oil in the engine- The IMS bearing will see ZERO of it!

The IMS bearing is not a component thats internally lubricated by the engine's oil, it is permanently lubricated when manufactured.. Thats it's biggest downfall.

The engines that I build have a maximum of a 5,000 mile oil change interval..

BruceP

The retrofit's bearings are splash lubed, though, correct?

Can you comment on whether oiling is affected by rpms in that case?

htny

welcome back big guy!

BruceP

Thanks.

jyoteen

interesting. I had my car on the track at 1100 miles on the odometer, and I for one definitely cannot be blamed for not driving it hard. I am one of those who is at 3-4K rpms or more. I don't lug it but there is no way I baby the car. I didn't spend 90K to preserve it and have it smell nice.

I will say that not only do I do the requisite fluid changes above and beyond the "schedule", but I do 2 brake flushes per year and that lifetime coolant? I purge that entire system every 30K miles, differential fluids, etc.

My mechanic just told me yesterday that he was surprised at my motor's lack of any corrosion so that's a good additional benefit of doing aggressive maintainence if you drive it hard (and even if you don't).

I don't have IMS failure but better to be safe than sorry. I had my wake up call and "luckily" it was the valve seat.