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#36721 05/01/2004 4:58 PM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | Dah, my brain went blank, when installing pistons with an off set wrist pin does the greater offset face into the crank rotation or away from the rotation? I'm doing an old Limey bike, this one has offsets pins, no marks on the piston for location. | | |
#36722 05/01/2004 5:04 PM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Doesn`t the crank journal line up with the cylinder bore?
What about con rod angle in the cylinder compared to the crank journal :confused:
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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#36723 05/01/2004 5:31 PM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 |
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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#36724 05/01/2004 7:05 PM | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | The purpose of an offset wrist pin is to get the thrust face of the piston tight against the cylinder wall before the plug fires. If the ignition timing is set before TDC, the offset needs to be placed so the piston loads the cylinder wall before TDC. This means installing the piston with the offset opposite the direction of rotation. If timing is after TDC, the offset needs to go in the direction of crank rotation. If the plug fires while the piston is "floating" in the cylinder, you'll get a piston slap as the plug fires.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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#36725 05/01/2004 10:38 PM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | Thanks guys,the total advance on these things is around 36 degrees BTDC, the advance at idle is 15 BTDC.British parallel twins (inline)don't use offset pins for whatever reasons,but these pistons are, ok, see what happens, | | |
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