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wd and d17 iv pistons
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Topic: wd and d17 iv pistons
    Posted: 15 Feb 2024 at 6:58pm
i have scored a d17 series 4 engine for my wc puller project has any one measured the pin hieght on the wd piston and the d17 piston ? can the wd pistons be milled down to make 12:1  wondrering about useing reliance wd cylinder kit 470283616  if i read it correctly that part number is a flat top 4 1/8 piston
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Feb 2024 at 9:25am
any one know what or whos brand , pistons i need for 4 1/8 bore  d17 rods , crank to make 12:1 compression
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IBWD MIke View Drop Down
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Joined: 08 Apr 2012
Location: Newton Ia.
Points: 3741 		Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Posted: 17 Feb 2024 at 8:07am
Originally posted by HudCo HudCo wrote:

any one know what or whos brand , pistons i need for 4 1/8 bore  d17 rods , crank to make 12:1 compression

Hud, I've got a set of 4&1/8" WD flat-tops that might work for you. We've discussed this in the past but not sure what compression ratio people thought they would make with a 45 crank.
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 17 Feb 2024 at 9:55am
any chance you can measure the center of the pin to the top
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20534 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Feb 2024 at 6:30pm
2.550" flat tops 4 1/8" makes 11.3 to 1 as I've outlined in the above "D-17 piston" post. So, more than that like 2.600" flat top 4 1/8" would be close or more than 12.0 to 1.

Edited by DrAllis - 17 Feb 2024 at 6:32pm
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Joined: 12 Sep 2009
Points: 20534 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Feb 2024 at 6:33pm
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HudCo View Drop Down
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Joined: 29 Jan 2013
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Points: 3552 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 17 Feb 2024 at 10:21pm
over looked that post ,     but i did measure  the part number 229717 4 inch pistons that i removed out of it ,   couldnt find that part number in the agco parts book listed for series iv  . i got 2.835 pin hieght and .352 from the top of the deck to the  top of piston  not bowl at tdc , did not measure the volume of the bowl .   reliance dosnt say what compression ratio their 4 1/8 wd flat top is      so their sould be plenty of room for the valves to open and close    it would be nice to have a dished or a bowl piston  with that flat head  hope i aint missing somthing
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Joined: 12 Sep 2009
Points: 20534 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 12:51am
Knowledge Base info: "Compression calculators for 226 engines" near bottom of the page. My own personal notes have a 170 (8.0 to 1) power crater piston at a .263" to .265" deck clearance at TDC. The 175 (8.25 to 1 ) power crater piston has a deck clearance of .230" to .235". This is measured to the highest part of the piston at the piston pin centerline. A D-17 piston ( 7.25 to 1) should measure about .368" to .370" deck distance. So, WD 4 1/8" flat tops need to measure a deck distance of .263" to .265" or less to be more than 11.3 to 1. Probably more like .230" to .235" for 12 to 1.

Edited by DrAllis - 18 Feb 2024 at 11:39am
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IBWD MIke View Drop Down
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Joined: 08 Apr 2012
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Points: 3741 		Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 6:02am
My flat-tops measure 2.375 c/l of pin to top.
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Joined: 12 Sep 2009
Points: 20534 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 11:41am
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Joined: 11 Jul 2011
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Points: 971 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve fischer Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 11:41am
food for thought ,I don't like a flat top piston for a 226 they don't have the bark , I have gone back to cupped pistons for a burn chamber(power crater)
Sealed power number 1728 is a 201 cupped 4 1/8 piston, fit right in ,hard to find,
m&w ap46 also fits may have to cut top off ,I think I have some used left 
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Joined: 12 Sep 2009
Points: 20534 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2024 at 11:49am
SP-46's I used to remove .170" off the tops and had 240+ psi cranking compression, Always called it 11 to 1 or a little better. I like the bowls too.

Edited by DrAllis - 18 Feb 2024 at 11:49am
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