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what forge piston to use.

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djfalcon10
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what forge piston to use.

Post #1 by djfalcon10 » Sun Oct 20, 2013 11:28 pm

installing 240 rods on 300 crank. what forge piston will work with this combo. dont want to use hypertic piston.going to be using nitrous on it, thanks, dj

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Re: what forge piston to use.

Post #2 by CNC-Dude » Sun Oct 20, 2013 11:37 pm

After doing the math, it looks like you will need a piston with a compression height of 1.244". There are several forged stroker SBF shelf pistons that have a 1.230" CH, so with a slight deck cut. you should be in business. The bad news now, with that short of a CH, you will have a pretty bad ring stack, and it would not be very forgiving for nitrous or forced induction.
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Re: what forge piston to use.

Post #3 by pmuller9 » Mon Oct 21, 2013 10:52 am

Rod = 6.795"
1/2 stroke = 1.99"
Deck Height = 10.00"

I get CH = 1.215"

I will be using custom pistons for around 10:1 compression.
Will post what I find available.

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Re: what forge piston to use.

Post #4 by CNC-Dude » Mon Oct 21, 2013 12:34 pm

HAH, were both wrong! I went off of what someone had posted on here as being the rod length for the 240 and it was wrong, it is actually 6.800", according to a TRW bearing book that has reconditioned connecting rods in it. It lists all of the common rod and crank journal specs too for all of the engines since time began, as well as the connecting rod dimensions for those engines also. So just doing the math it makes the compression height equal 1.210". So you'll have to allow another .005"-.010" off of that for a deck cleanup or you may have them sticking out above the deck slightly. A 1.200" would be a better target number to shoot for.
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Re: what forge piston to use.

Post #5 by djfalcon10 » Mon Oct 21, 2013 3:12 pm

someone said to use the ford 352 piston.will that work?

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Re: what forge piston to use.

Post #6 by CNC-Dude » Mon Oct 21, 2013 3:43 pm

Not when using a 240 rod.
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Re: what forge piston to use.

Post #7 by BIG 6 farmer » Mon Oct 21, 2013 6:14 pm

A lot of good Companys that can whip up a set of Pistons (not too heavy) Just need to give them the correct specs. :hmmm:
83 F 150 SB 4x4 300 six NP 4speed - - 1950 IHC L162 (1&1/2 ton?) - 87 & 88 T-Bird Turbo Coupes - 2000 Triumph Tiger , 76 Honda GL 1000 , & other toys and parts (& junk) -

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Re: what forge piston to use.

Post #8 by CNC-Dude » Mon Oct 21, 2013 6:46 pm

Yeah, I was going off of info that guys on here posted about the rod length that should have known, but turned out they didn't. I had the info on hand and should have doubled checked, but since it was coming from a seemingly knowledgable source I didn't. The piston specs are accurate now, and should be no problem getting pistons for them from any number of sources.
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Re: what forge piston to use.

Post #9 by THE FRENCHTOWN FLYER » Mon Oct 21, 2013 9:37 pm

BIG 6 farmer wrote:A lot of good Companys that can whip up a set of Pistons (not too heavy) Just need to give them the correct specs. :hmmm:

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