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Discussion Forum

Will D17 pistons fit in a WD block.

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04-09-2002 03:41:02

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I've got a "WD" and I just purchased a 45 crank and I've been told put 175 or D17 pistons in it, but will the sleeve fit without boring the block?

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Mike B

04-11-2002 11:08:15

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 Re: Will D17 pistons fit in a WD block. in reply to Kurt, 04-09-2002 03:41:02  
Yes, the 175 piston use a 2.65 compression height and that will give you 8.2:1 compression ratio.
The 170 piston will give you a 2.60 compression height that will give you 8.0:1 compression ratio.
If your going to pull it use the Sealed Power pistons with Farmall H-300-350 connecting rods reworked to fit the wd45 crank this should give you 11.0:1 compression. The Farmall rods are 8" center to center while the AC's are 7-1/2". Using the Sealed Power pistons are only good for 6.2:1 with A-C rods.

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04-12-2002 07:16:25

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 Re: Re: Will D17 pistons fit in a WD block. in reply to Mike B, 04-11-2002 11:08:15  

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Mike B

04-12-2002 11:47:58

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 Re: Re: Re: Will D17 pistons fit in a WD block. in reply to JOHN, 04-12-2002 07:16:25  
Yes, I like the D17 mainifold and carb, However
decent results can be made by port matching the WD45 units. I actually calculate the horsepower to be about the same, but the 17 will get you the low end velocity for torque at low rpms in addition to making hp at upper rpm. As for the carb call Motec Engineering.

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04-09-2002 05:33:55

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 Re: Will D17 pistons fit in a WD block. in reply to Kurt, 04-09-2002 03:41:02  
Yes, they fit...

Be sure to check the lower Block Webs for cracks...Nearly all have a crack between #1 & #2.....it does not render the block unserviceable---it just will need to be repaired, then Seal the lower Block and Sleeves well ( Coat the Lower inside Water Jacket W/ Aviation Sealer, or Permatex....GLYPTOL would be the best, but may be hard to find...It is made to coat Electric motor armatures, and is popular for coating inside racing engines...

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04-12-2002 19:39:58

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 Re: Re: Will D17 pistons fit in a WD block. in reply to Ron, 04-09-2002 05:33:55  
Not to seem defensive but the great majority of WD blocks that I've ever had apart were not cracked at all and the majority of the cracked ones were cracked at the top only which is usually caused by the engine having been over heated at one time or another. This crack at the top has never given me a leakage problem. The only time I've ever seen a crack at the bottom webbing is from freezing which usually also caused a crack on the external side of the block.

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