Re: The facts are... - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: The facts are...
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Posted by Dean (more from Dean) on Thu, 26 Sep 2002 21:20:30 Share Post by Email
In Reply to: Re: The facts are..., Jay C, Thu, 26 Sep 2002 19:04:55
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Shock load? You have not any idea what you are talking about.

Perhaps a nut reving the engine and dropping the clutch. From the engines and trany's point of view the rate of change of torque from the MBC getting the turbo to spin up is not existant. Thats slow motion.

You talk about increased failure potential. Well outright failure potential does not increase with load until the loads exceed a point where metal wants to yield. So its not so simple.

The C900 engines from the 80's are running great, and at 20PSI or more. So explain that?

All kinds of turbo engines are given mild overboosts with boost controllers. I just don't see things failing.

And on boost, with delayed ignition, the peak loads and pressures can often be less than a high compression NA engine with the accompanying advanced timing.

And the 30 PSI or so of exhaust backpressure lessens the intertial tension loads on the conrods and wrist pins.

The lower compression ratios also reduce some load components.

Boost pressure reduces tensile loads during the induction stroke.

Turbo engines are typically driven at lower rpm's which lessens loads relative to the high rpm's required with NA engines.

The peak bearing loads on a high compression engine at high rpm's can be higher than a turbo variant of the same engine, with lowered compression ratio, at wide open throttle on boost. The turbo has more sustained forces, and they act on the piston when the crank is well past TDC where the forces resolve to turning the crank instead of simply banging the main bearings.

Most bearing wear is caused by contamination, not loads.

It sound like you are powered by Paranoia.

Happy Saabing :)

posted by 65.68.100...

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