Delivery checks and running in

Jim said:

Atomsplitter, yup, well said. Makes sense. In aircraft engines we do tend to run them hot for break in, but as I have said, very old design with huge tolerances and a greater concern for glazing over the cylinders. And they run with 200 + - air, usually cold, cooling them. In aircraft, turbines are the way to go -- how cool would it be for bikes (not that we could afford them).

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atomsplitter said:

There's a good reason for "break in" if the engine isn't broken in at the factory (most Jap bikes are factory break in).

Here's why:
Take a brand new piston and put it in the oven and cook it at 500 degrees for 2 hours. Then try to fit it in your engine. What, it won't fit? The piston skirt is warped? It's brand new!

Forged pistons have residual stress from the machining process that must be annealed to relax the stress and allow the piston (and other mechanical parts) to work together without seizing the motor. That is typically done by slowly heating the parts and allowing the metal chrystalline structure to realign. In a new engine the heating must be slow enough to allow the parts to continue working while the metal is being reshaped to it's final form. Once the metal is annealed it will have full strength and ductility. Rapid heating is OK if you also allow a cooldown period (think 1/4 mile blasts followed by shutdown). Both methodologies will work.

Spanking the piss out of a new motor is asking for the new motor to turn all it's internals into brittle fracture bombs. The best part is you'll never know when one is ready to go off until it leaves you stranded.

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Jim said:

That's it, I starting my own late night talk show....

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atomsplitter said:

Jhttp://www.marineturbine.com/motorcycles.asp

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atomsplitter said:

The turbine bike doesn't have the speed limiter of the Rocket. Another oddity of the turbine is the faster you go the more power it makes. At 227 mph it's making about 600 bhp. Pistons lose.

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barbagris said:

Speed limiter? - How fast does the turbine get there though? - We're talking 0-100mph or 0-440yards stuff here. No really - I'm interested.

Maybe it should be a road run - Boston->LA. I dunno.

Mr Leno - I suggest sir, you are a weedy pigeon. And you may call me Susan if it is not so. (Yes I have been at the wine)

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