fabric

Heh. If you are doing lots of highway miles, the Corvettes are pretty good fuel economy-wise, but even around town are pretty reasonable, considering. The Z06 has about the same ratings as my BMW V8, a bit better on the highway.

On a total thread drift note, my friend just sent me the ebay listing for an E55 wagon, and they had a shot of the dash showing fuel economy - 11.4 mpg.

Mike Murphy

My girlfriend's stock 2002 BMW 325ci gets around 20mpg on the highway. Only 188 horsepower. I admire those who daily drive their Z06s and Porsches instead of spending another $50,000 to drive a truck to work.

bkingdon

I have had 3 timing chains jump teeth on non-interference engines. Each time it was in the driveway at home. Car would not start - check ignition timing (distributor technology) to find it was out by 25 degrees.

My wife used to drive a 1987 Toyota Supra Turbo. It had belt driven cams and showed no wear after 60,000 miles service intervals although I did the change anyway.

Now she has a Subaru, also belt driven cams (4), oil pump and water pump - sound familiar? The difference here is that a new belt has 5 white marks that you just align with the marks on the crank gear and the 4 camshaft gears - timing is done. Of course, it also has a "Porken" hydraulic tensioner factory installed!

Any moving part is subject to failure over time, just a question of when.

Brian.

marton

Just do a cost benefit analysis, how far can you drive a 928 with $50K of gas? Then figure the difference between the 928 gas mileage and the truck gas mileage; assuming the 928 mileage is better than the truck and see how far you can drive for the difference.

Marton

Daniel Dudley

Has anybody ever looked into what it would take to make a non-interference 32 valve engine ? Is it possible ? This would really make any weakness in the design moot. Not that it would be practical to retrofit unless rebuilding/swapping pistons.

Mike Murphy

I think the easiest way is to change the pistons, which would bring down the compression ratio. I guess if someone were putting together a pressure-fed 928, they might consider trying to make that work. I guess it could be considered "easy" if the engine is already out for a rebuild.

I would change the belt often and not worry about it

123

I've seen broken chains as well as belts. Kind of surprised that there hasn't been more mention of gears. Okay, I guess I can see why that may be.

Mike Murphy

The gears themselves hardly ever break, but the real drawback is that the gears are so precise, they transmit much of the harmonics from the crank to the cams. This just causes a lot of added vibration and wear.

inactiveuser92616

the dodge/chrysler 2.7L V6 is plagued with timing chain problems.