anyone ever seen a scorched crankshaft?
Posted October 07, 2002 - 02:16 AM
What is up w/ dat?
My last ride I was sucking air REAL BAD via my fuel screw opening. The OEM spring disappeared. I used an ink pen spring to pre-load the o-ring on the fuel screw.
Needless to say, the spring was too weak and I had a severe vacuum leak into my engine.
I have NEVER seen a crank w/ blue heat marks on it!
Posted October 07, 2002 - 03:02 AM
Are you sure that’s not just heat-treating marks?
I would think that if it got hot enough to turn the crank blue that it wouldn’t still be running.
As for the clip, check the magnets on the flywheel.
Posted October 07, 2002 - 03:28 AM
If you were to heat a peace of steel to harden it the molecules expand and become viable. Cooling the same steel at a slow rate of fast rate will increase or decrease its tinsel strength.
Cooling it at a slow rate like a crank rod after a hard hot ride + it being drenched in oil will only harden the crank giving the bluing effect. Dipping a hot piece of steel in oil as it cools adds to its tinsel strength Effectively hardening the piece and turning it blue. This is the same effect you see on a exhaust header the hottest area will turn blue.
Cranks shatter also because of this effect they become brittle as they wear.......
Just food for thought.
Posted October 07, 2002 - 05:09 AM
Posted October 07, 2002 - 05:39 AM
This is for improved durability of pressed crank assemblies since the bottom end bearing is where pounding from the piston is the greatest. Heat treating the entire crank is overkill since the process makes the metal more prone to brittle failure in small cross section areas like where the flywheel attaches at the end of the crank.
Posted October 07, 2002 - 10:22 AM
Posted October 07, 2002 - 04:50 PM
Posted October 08, 2002 - 05:21 PM