Engine Assembly Question, Which way do the pistons face? |
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Engine Assembly Question, Which way do the pistons face? |
ThinAir |
Mar 27 2005, 06:10 PM
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#1
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region |
I'm about to install the Mahle Euro (flat top) pistons and cylinders. I know that it is critical to have the pistons facing the correct direction relative to the flywheel. I'm used to seeing an arrow on top of the piston that is supposed to be pointed toward the flywheel. These Mahle pistons have no such marking.
This picture shows the top of the piston. Is that funny little symbol supposed to represent a crankshaft & flywheel? Is it critical which side faces the flywheel end or just that all the pistons are the same? I'm hoping someone answers quick - I'd love to get the heads on tonight! Attached image(s) |
Mark Henry |
Mar 27 2005, 07:52 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
You should figure out your proper CR then get custom spacers from Jake or rimco.
here's the math....enjoy (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) Engine cc formula: Bore (mm) X bore X stroke (mm) X 0.0031416 = Engine cc Example: 90.5mm X 90.5mm X 78mm X 0.0031416 = 2006.97cc Deck volume cc formula: Bore (mm) X bore X deck height (in.) X 0.01996 = deck volume cc Example: 90.5mm X 90.5mm X 0.080" X 0.01996 = 13.07cc Head cc is measured by using a Head cc kit (stock T1 is about 48-50cc, 914 2.0 about 60cc) The CR formula: Head cc + deck cc + (engine cc divided by 4) = CR Head cc + deck cc (+ piston notch cc, if any) Example: 54 cc + 13.07 cc + (2006.97 divided by 4) = 568.8125 = 8.48 54 cc + 13.07 cc = 67.07 568.8125 divided by 67.07 = 8.48 or 8.48:1 CR |
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