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Discussion Forum
:

Difference between Wd45 powercrator and 175 pistons?

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Allis puller

05-17-2002 02:48:04




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I want to buy an 1/8" over bore kit for my WD puller and would like any suggestions. Just bought a WD45 crank.




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Agco puller

05-20-2002 08:26:20




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 Re: Difference between Wd45 powercrator and 175 pistons? in reply to Allis puller, 05-17-2002 02:48:04  
WC-WD cams use a .250 lift X 1.488 rocker arm ratio so .25X1.88=.372 lift at valve - .012 lash
So the valve will come down a total of .360 inches.
D17's have a .260 lift but I have no specifications on the 45's lift. Also a good rule of thumb is .100 piston to valve clearance.
As for predictited HP with the Temco/Tisco's at 6.5:1 compression I calculate 46.5HP still less than the Standard bore D17 piston(@ 54hp) or 175
standard bore with your cam at about 60Hp. Compression ratio will build hp faster than your overbore at low compression ratio's.
As for the flat top yes you gain compression ratio but since the head is also flat which will kill good air turbulance and torque. Domes are a complete no no as this will reflect air away from the valves entirely. Small block chevy's with their small combustion chamber's in the head love flat top pistons, Big block chevy's with their large combustion chamber love domed piston to funnel air in and out.The W'series A-C must use a combustion chamber in the piston (crater, dish) to funnel air because the head is flat (no chamber)

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L Hud

05-18-2002 17:42:48




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 Re: Difference between Wd45 powercrator and 175 pistons? in reply to Allis puller, 05-17-2002 02:48:04  
If you are wanting more compression-go with a WD piston with the powercrater top.If you can find them you should go with those designed to operate at 8000 altitude. The distance to the top of the block will be well under one half inch.
Hope this helps
L Hud



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Kurt

05-17-2002 16:03:51




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 Re: Difference between Wd45 powercrator and 175 pistons? in reply to Allis puller, 05-17-2002 02:48:04  
So who should I order the pistons from? I got the overbore crators from tmeco but I think they get the same thing as Tisco. Would my local Allis dealer carry 1/8 overbore 175 pistons?



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Another question for Agco puller

05-17-2002 14:09:52




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 Re: Difference between Wd45 powercrator and 175 pistons? in reply to Allis puller, 05-17-2002 02:48:04  
I've got the engine down right now, and before I dropped in the crank I measured from the piston to the top of the block and there was exactly 3/4" and now that I'm adding 1/2" of stroke I can't see where I could possibly fit 175 pistons in there. But I rebuilt this motor two summers ago and I put the 1/8 overbore with powercrator pistons, I ordered them from Temco and I looked them up in the book and its the same part# for WD45 and 175. How far down do the valves travel? You say 175 pistons are 9/32 taller, Maybe I already have the same ones your talking about. What do think about the whole situation?

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Agco puller

05-17-2002 14:35:19




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 Re: Re: Difference between Wd45 powercrator and 175 pistons? in reply to Another question for Agco puller, 05-17-2002 14:09:52  
Your adding 1/2 stroke but our piston is only going to come up to 1/4" so your still exactly 1/2" from top of deck. The 175 original piston was exactly 1/4" from the top. The throw is equal to half the stroke, so a 45 crank at 4-1/2" is 2-1/4" throw. A-C blocks use a 12-21/32" deck hight.
12.65625-7.500(rod length)-2.25(crank throw)-2.40625(piston compression height) will equal 1/2"
piston top to top of block. With the crater piston
that still about only 6.5:1 compression

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Acgo Puller

05-17-2002 10:09:27




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 Re: Difference between Wd45 powercrator and 175 pistons? in reply to Allis puller, 05-17-2002 02:48:04  
The difference is in the compression hieght. This is the dimension measured from the centerline of the wrist pin vertically to top of piston. I believe the WD45 is about 2-3/8" and the 175 was 2-21/32" or 9/32" higher. This raises the compression ratio from 6.5:1 to 8.2:1. Be carefull though I belive most after market over bore pistons i.e. Tisco, Dana(Victor), and Federal-Mogul(Sealed Power) are 2-25/64") this would only yeild about 6.8:1 compression which is actually less than stock for a D17,170,175! However this piston with the Farmall H-300-350 Rod which is 8" center to center and can be modified to work with your new crank would yeild a stout 11.0:1 compression ratio. I'm going to be building that combo this summer.

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JOhn

05-18-2002 18:43:46




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 Re: Re: Difference between Wd45 powercrator and 175 pistons? in reply to Acgo Puller, 05-17-2002 10:09:27  
how much compression is that in psi?
thanks...is there a formula for figuring that??
John



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41 C # 552

05-17-2002 23:49:51




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 Re: Re: Difference between Wd45 powercrator and 175 pistons? in reply to Acgo Puller, 05-17-2002 10:09:27  
Power crator pistons? Are you talking about dish top or raised dome pistons?



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Allis puller

05-18-2002 08:47:06




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 Re: Re: Re: Difference between Wd45 powercrator and 175 pistons? in reply to 41 C # 552 , 05-17-2002 23:49:51  
Dished top.



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41 C #552

05-18-2002 12:20:07




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 Re: Re: Re: Re: Difference between Wd45 powercrator and 175 pistons? in reply to Allis puller, 05-18-2002 08:47:06  
Wouldnt a flap top piston do better than a dish piston?

We race dirt track race cars and make more power with a flat top piston over a dish piston.

Has to do with shrowding the spark and turbulance in the cylinders.



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Larry Hardin

05-20-2002 04:50:43




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 Re: Re: Re: Re: Re: Difference between Wd45 powercrator and 175 pistons? in reply to 41 C #552, 05-18-2002 12:20:07  
The M&W pistons AP-46 are for a WD. AP-48 are for a 45. I found out the hard way on what to use. Using the AP-46 piston with the WD-45 crank, the piston comes out of the block about .050". With the head gasket compressed I still had .030 clearnace there BUT the dish in the pistons is not wide enough for the valves to clear so now I have 8 bent valves, and 1 broken piston. Compression had to be way up there. If you use the WD pistons, they will work and bump compression, but you need to have valve reliefs cut in that little piece on top the piston

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