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graveyard 
Bronze Level
Joined: 23 Mar 2011
Location: ewing
Points: 77
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 Topic: wd piston vs wd 45 piston
Posted: 20 Apr 2013 at 6:49pm |
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I have been told that you can switch a wd piston with a 45 piston and gain stroke length. Has anyone any info on this? Have a 45 dead weight puller and just need a little more hp with a trailer hood budget.
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CAL(KS)
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Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3786
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Posted: 20 Apr 2013 at 8:02pm |
a wd piston is flat and the wrist pin is farther down and will give a tighter squeeze at the top (more compression)when used on a WD45 crank VS a WD crank. wd45 piston is cupped and has the wrist pin higher up to compensate for the extra stroke of the WD45 crank.
WD45 pistons on a WD crank = less performance than a regular WD cause of lower compresson
stroke is gained by changing a WD crank 4 inch stroke (Uxxxx) casting with a WD45 crank 4.5 stroke (xxx226) casting
Edited by CAL(KS) - 20 Apr 2013 at 8:07pm
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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mlpankey
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Joined: 13 Sep 2009
Location: Vols country
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Posted: 20 Apr 2013 at 8:19pm |
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You can not gain any stroke length by any piston selection. Stroke is derived from the crankshaft
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graveyard
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Joined: 23 Mar 2011
Location: ewing
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Posted: 20 Apr 2013 at 10:33pm |
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but if the wrist pin connects at a different point that makes the piston and rod longer which will increase stroke.
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Rod B
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Joined: 25 Jul 2011
Location: Peoria
Points: 415
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Posted: 20 Apr 2013 at 10:43pm |
No it does not increase stroke, but it will increase compression. The total volume will be different, the swept volume will still be the same. You're takeing the same amount of air in the swept volume and squeezeing it into a smaller space.
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22823
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Posted: 20 Apr 2013 at 11:10pm |
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If you have a WD45 and you put WD pistons in it, you will have a higher compression ratio and more power. If you have a WD and put 45 pistons in it, you will end up with lower compression and less power. The only way to get more stroke is to change the crankshaft, no matter what engine you have.
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graveyard
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Joined: 23 Mar 2011
Location: ewing
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Posted: 21 Apr 2013 at 12:06pm |
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thanks putting wd pistons into 45.
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farmer_rob
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Joined: 11 Sep 2009
Location: N.Lancaster ont
Points: 362
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Posted: 21 Apr 2013 at 7:38pm |
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Ok just how much power increase would there be by putting wd pistons into a wd45. Would it be more then what you would get if you put a combine motor in?
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if farming was easy everybody would be doing it
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Kip-Utah
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Joined: 14 Sep 2009
Location: Southern Utah
Points: 872
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Posted: 22 Apr 2013 at 10:05am |
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WD flat top pistons swinging from a WD45 crank will give a higher compression ratio than even a "Z code" combine engine...Will it make more horse power than the combine engine? That all depends on the rest of your combo; cam, carb, manifold, ignition, etc. If you are talking everything else being stock 226 cid WD45 vs/stock 226 cid Gleaner E with both engines governed to the same speed, I'd say you are going to be about the same horse power with either engine. Kip
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HANSEN'S OLD ORANGE IRON. Showing, Pulling, & Going!!
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tbran
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Joined: 14 Sep 2009
Location: Paris Tn
Points: 3297
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Posted: 22 Apr 2013 at 10:02pm |
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we have built this combo probably 20 years ago in the past and have posted about this.
This combo is about the highest CR - non machine work combo available. This is too much compression to run everyday with 87 octane. As carbon builds up the timing will have to be retarded to avoid 'ping'. However as a 'stock' puller on premium with a 175 carb or d19 carb with adaptor and the intake throat opened up it will raise the approx. 52 hp stock PTO hp E engine on a WD to about 67. With a cam mod it went to approx. 70 hp at 1650 rpm with lots more track sensing torque. When lugged down to approx 1400 rpm the ping came back. Adding a 1/16th 'power crater' like bowl cutout to the piston under the plug was the best we got for a 'stock; class. We didn't gain any HP but got a lower lug down torque w/o ping. Still running these 'test' engines on the farm in a WD and D17 chore tractors with no problems and LOTS of hours. BTW took the plastic venturi out of the 175 carb and put in a smaller d17 brass one and drastically lowered the fuel consumption when used on a grain auger - much more efficient = maybe not as much fun but leaves more for paying the bill I get stuck with for Sunday family lunch..........
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