Pls help: RMS vs IMS failure?

[Lobo1186]

Originally Posted by Jake Raby

I will also state that very rarely do we get calls from owners that have experienced the IMS failure who had previously owned and driven an Aircooled Porsche...

being not old enough to really have owned or experienced an air cooled porsche (I do love the 993 but but I was only 10 or so at the time.)

im not sure I understand the implication here. is it a style of driving or is it an understanding of how porsches work or what it is.

[tnoice]

Please correct me if I am wrong, but the history surrounding Porsche is of Race heritage. Porsche's were designed to see tracks or high speed highways on a regular basis. Many times, around town driving, or anemic driving does not allow the fluids to heat up to proper temperatures, thus causing damage to internal parts of the motor. When a vehicle sees tracks, higher speeds or harder loads it will burn off these impurities, thus causing less wear and tear on your parts. These vehicles will also see more fluid changes than cars that are parked in a garage and allowed to sit there looking pretty. That is why many Porsche owners will autocross or track their cars on a semi regular occurrences. The vehicles that are garage queens have a tendency to have more problems than the vehicles that are regularly driven.

[Lobo1186]

tnoice. not sure if you were addressing my post but ill supose you are. I understand that completely it was just the relation between the aircooled owners and those not. It isnt that i feel offended or defensive or anything of the sort just interested in knowing the correlation.


I figure if my IMS is gunna go then so be it. but hey if jake says more RPMs a day keeps the doctor away then hell... ill take a double dose of that medicine!

[BYprodriver]

Originally Posted by tnoice

Please correct me if I am wrong, but the history surrounding Porsche is of Race heritage. Porsche's were designed to see tracks or high speed highways on a regular basis. Many times, around town driving, or anemic driving does not allow the fluids to heat up to proper temperatures, thus causing damage to internal parts of the motor. When a vehicle sees tracks, higher speeds or harder loads it will burn off these impurities, thus causing less wear and tear on your parts. These vehicles will also see more fluid changes than cars that are parked in a garage and allowed to sit there looking pretty. That is why many Porsche owners will autocross or track their cars on a semi regular occurrences. The vehicles that are garage queens have a tendency to have more problems than the vehicles that are regularly driven.

No engine should be started unless it will be allowed to reach its operating temperature (minimum 180 degrees) Porsches seem to need the higher oil pressures that come at higher RPMs (3500 + ) for best lubrication in the engine, IMS included. And specifically in the case of the OP Vario-Cam engines should not cruise @ 2200rpm - 2500rpm to prevent Vario-Cam advancing back & forth or off & on.

[Cloudsurfer]

Originally Posted by BYprodriver

No engine should be started unless it will be allowed to reach its operating temperature (minimum 180 degrees) Porsches seem to need the higher oil pressures that come at higher RPMs (3500 + ) for best lubrication in the engine, IMS included. And specifically in the case of the OP Vario-Cam engines should not cruise @ 2200rpm - 2500rpm to prevent Vario-Cam advancing back & forth or off & on.

While generally true, remember that the IMS bearing does NOT receive pressure lubrication, but is a sealed bearing (and that is a good part of the problem). Also, since his car is an 04, it has the newer, vane cell type variocam, that does not change the chain tension as it works.

[jmatta]

Is it a style of driving or is it an understanding of how porsches work?

Throw a brick on the accelerator and left foot brake

Just kidding, of course. Being a 911 guy, we like to drive our cars in the upper revs...power is there and it builds the oil pressure. Lugging a Box engine around town or on the highway is bad news...I rarely use sixth gear because US highways just don't allow the speeds that come with driving in the proper RPM range; i.e. >3200 RPMs.