Quote:
Originally Posted by Meat Head
I understand what you are saying but I worry that if you drive in such a high rpm range you may be saving the IMSB but putting stress on other just as critical engine parts. I would love to know the answer to this quandary!
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you really aren't stressing the engine unless you are driving the car 10/10's consistently, like on long track stints for instance.
And its not just the IMSB you are hurting by driving below 3K RPM. Actually for 2.5's like yours, D-chunk failures are suspected to be caused by drivers who treat the engines too gingerly or post low mileage. ditto for the 3.4 Carreras. I get the impression generally that if the engine is going to fail, it's NOT because you're driving it in the 3-5K range consistently. More like design flawes that surface with improper attention to cooling --original water pumps in for too long, radiators, bad hoses,etc... and using crap oils for intervals that were too long.
I recall a post by flat six where they indicated that on their test engines they intentionally try to break the engines by subjecting them to all manner of extremes and even then inducing failure is no easy task. Makes me wonder if this included running the engines up and down below the 3K RPM for long periods.