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ap 46 pistons
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jvin44 View Drop Down
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Joined: 04 Mar 2015
Location: Elsie, MI
Points: 53 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jvin44 Quote  Post ReplyReply Direct Link To This Post Topic: ap 46 pistons
    Posted: 27 Mar 2017 at 8:40am
Anyone know off hand hiw much to take off tops of ap46 pistons to put in a wd45 engine looking for around 11.5 to 1 compression
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mattb View Drop Down
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Joined: 11 Jan 2011
Points: 348 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mattb Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2017 at 8:51am
Im thinking we took .100 off the set I did in my friends tractor came out to 11.5 to one when I figured it. Havent ran a compression test on it yet.
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Big Orange View Drop Down
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Joined: 11 Sep 2009
Points: 313 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Orange Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2017 at 11:21am
.250 will get you about 10.3:1, that's as hi as I would go with stock cam, & very hi octane gas, at stock 30 degree spark timing, + hi output coil & electronic mod.
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Big Orange View Drop Down
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Joined: 11 Sep 2009
Points: 313 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Orange Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2017 at 2:53pm
That's with Sp 46 M&W kit .
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jvin44 View Drop Down
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Joined: 04 Mar 2015
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Points: 53 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jvin44 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2017 at 2:56pm
If u take .250 off u mights well not use the pistons might as well use 45 pistons. So im not sure
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 19499 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2017 at 5:20pm
Look, there are a dozen different piston molds. What you want to do is remove the minimum amount from the piston top just so it doesn't hit the cylinder head. Assuming it has a POWER CRATER bowl design, make the piston top flush with the top of the sleeve and then the head gasket will give you about .060" running clearance. THE COMPRESSION WILL BE WHATEVER IT WILL BE DEPENDING ON THE BOWL VOLUME. Years ago, I removed .170" from the outer edge of the piston tops on a set of M&W SP46 pistons. It had 240 psi of cranking compression and ran well with 103 octane fuel. Ignition timing will probably be around 25 degree BTDC at full throttle, but dyno tuning is the best. Cold spark plugs like AC Delco 43's is what I always use.
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