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flat top pistons.
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AaronH View Drop Down
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Joined: 12 Sep 2009
Location: WI
Points: 601 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AaronH Quote  Post ReplyReply Direct Link To This Post Topic: flat top pistons.
    Posted: 05 Oct 2010 at 8:34am
I bought a set at an auction the other day. I assume they are from a WC. The part # is 217282. How much will I really gain putting them in my 45 with stock cam and carb?  And while I am thinking... Why did Some WC's have flat top pistons, then the 45's had power crater pistons? 
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Pa.Pete View Drop Down
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Joined: 01 Oct 2010
Points: 239 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pa.Pete Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2010 at 9:37am
I believe the crater was designed to aid in combustion by directing the fuel air mixture twoards the spark plug, kind of like a hemi but in the piston not in the head. Depending on the year I think a WC had a compression ratio of about 5.0 to 1 and a WD45 is about 6.5 or 6.75 I've seen both written, so you would have to figure out the volume of the crater to determine the compression increase.
 
My 2 cents worth,
Pete
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Michael Crowe View Drop Down
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Joined: 11 Sep 2009
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Points: 1722 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Michael Crowe Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2010 at 10:22am
Aaron, I have a WD45 parts book that shows the various pistons used and their respective compression ratios. I will look tonight when I get home and post back on here. Michael
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Brian Jasper co. Ia View Drop Down
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2010 at 12:53pm
Maybe Mitch will see this and chime in with his puller build experience, but seems like putting 201 cid pistons in a 226 cid engine really ups the compression ratio.
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mlpankey View Drop Down
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Joined: 13 Sep 2009
Location: Vols country
Points: 4580 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mlpankey Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2010 at 4:31pm
I dont like power crater dished pistons on engines that were engineered with no quench to begin with. all my engines are built with flat tops and even the ones with huge bores that the head cannot fill have burn /carbon patterns from the plug to the center of the piston.
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