AirSpeed VW Community Forums

Technical => Engine Tech Forum => Topic started by: egspot on November 12, 2005, 05:13:52 PM

Title: Stroker?
Post by: egspot on November 12, 2005, 05:13:52 PM

I am very curious. When you changed from a 69 to a 78 or 82 crankshaft is that measurement the distance between the center of the crank and the center of the rods? If you did change that would mean that your rods have to be shorter? What about your pistons and cylinders?


Any ideas, where i find this information/

Thanks

Emilio

Title: Stroker?
Post by: Bruce on November 14, 2005, 10:21:05 PM

The stroke is not the distance from the center of the crank to the center of the rod, but from the center of one rod to the center of the opposite rod.

You don't need to change rods when you increase the stroke.  Normally when you are using a stroke 78mm and more you use what is called \"stroker\" pistons.  These pistons are shorter from the pin center to the top of the piston.

Title: Stroker?
Post by: silas on November 14, 2005, 10:41:54 PM

Quote

The stroke is not the distance from the center of the crank to the center of the rod, but from the center of one rod to the center of the opposite rod.

just so i'm not confused, it's the center of one rod journal to the center of the opposite rod journal, correct?

as per jims picture...

(https://airspeedparts.com/forums/proxy.php?request=http%3A%2F%2Fmembers.shaw.ca%2Fchoptop3%2Fjimscar3%2Fcrankstats.jpg&hash=4a0f9c4b1627af30f31eeb7a9a6a43efe9430587)