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M&W 4.125 AP-46 pistons
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Unstylish View Drop Down
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Joined: 11 Mar 2010
Location: Southwestern
Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Unstylish Quote  Post ReplyReply Direct Link To This Post Topic: M&W 4.125 AP-46 pistons
    Posted: 12 May 2010 at 5:55pm
I just picked up an almost new set of AP46's and sleeves that were in a WD in the junkyard. What are the specs, especially the compression distance? Looking at putting them in an offset grind combo, so height matters..thanks..
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CTuckerNWIL View Drop Down
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Joined: 11 Sep 2009
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Points: 22823 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2010 at 7:04pm
The stroke, rod length and piston height from wrist pin to top are all numbers to take into consideration. If you have the pistons you can measure from the wrist pin center to the top of the piston.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Points: 20939 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2010 at 7:14pm
If they are SP-46's, combine them with a 4 1/2 stroke crankshaft (WD45 or D17) they will need .170" or so removed from the tops to keep from hitting the cylinder head. This is a nice set-up and will require real good gasoline (like 100 octane or better). Compression pressure while cranking with the starter should be around 240 psi.
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Joined: 12 Sep 2009
Points: 20939 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2010 at 7:32pm
Ignition timing will also have to be backed down to around 15 to 20 degrees BTDC (instead of 25 to 30 degrees BTDC) and should be adjusted on a dynomometer for best results.
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Joined: 11 Mar 2010
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Unstylish Quote  Post ReplyReply Direct Link To This Post Posted: 13 May 2010 at 6:26am
Thats roughly what I needed to know..thanks!
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ALinIL View Drop Down
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Joined: 20 Sep 2009
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Points: 316 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ALinIL Quote  Post ReplyReply Direct Link To This Post Posted: 13 May 2010 at 11:27am
Question for DrAllis.  What is the difference between a AP-46 and a SP-48?  Reason as I just removed a set of SP-48's from a WC?  - AL
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Joined: 12 Sep 2009
Points: 20939 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 May 2010 at 12:29pm
I really don't know....I KNOW what SP-46's are.....AP-46 is a newer?? version or is it a typo?? ("S"and "A" are next to each other)
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Larry(OH) View Drop Down
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Points: 1577 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Larry(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2010 at 9:47am
I haev a piston showing where you need to fly cut for clearance with this setup (long story):(  It definately cranked hard
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