Ford Replacement Pistons
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Topic author - Posts: 596
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- First Name: Brad
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Ford Replacement Pistons
What size replacement cast iron pistons were available from ford back in the day? I pulled these from my 27 TT engines while back and just got around to taking the rods off them when I noticed that they were oversized. My 3-4” micrometer is out of commission at the moment and I can’t tell if these are 0.025” or 0.0025” oversized. Someone educate me!
Brad
Brad
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- First Name: Mark
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Re: Ford Replacement Pistons
The would be .0025 OS. Which is one of the over sizes that was sold.
I know the voices aren't real but damn they have some good ideas!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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Re: Ford Replacement Pistons
I have also seen.031. Go figure that one. Dan
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Re: Ford Replacement Pistons
That one's easy - Bore the cylinder 1/32" OS and it gives you .0025" clearance between the cylinder wall and piston. For someone relying on "country smithy methods" where tools are in 32nds and 64ths, to fix a problemit makes surprisingly good sense.
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Re: Ford Replacement Pistons
Ford did not throw nothing out, if blocks where bored to big they waited and ran a bunch that way, I have found lifters smaller than stock, so I had to bore them out to except std. tappets, I found bores bored on an angle where something was under the deck when clamped down, decks of blocks off .015 from shavings also.
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Re: Ford Replacement Pistons
When I tore the engine down for the 21, still had stock standard pistons. However the valve stems were first over size 2 piece valves. My OP is it came from the factory that way.
I know the voices aren't real but damn they have some good ideas!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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- First Name: Terry
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Re: Ford Replacement Pistons
The junkyard replacement block that my Grandfather put in his 1927 coupe, was a 1922 numbered block. When my Dad and I pulled that engine in 1965, we found that only the block was 1922, When Granddad replaced the block, he evidently used the EE crank and other parts from the original 1927 block. The pistons removed from the 1922 block were Ford .031 o.s. cast iron pistons. I never have understood why, other than supplying a slightly o.s. piston for blocks which weren't professionally re-bored, why Ford didn't go .005, .010, .020,.030, .040, .060.
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Re: Ford Replacement Pistons
Regarding Ford Script .031” pistons:
Shortblocks rebuilt at Ford branch plants received those size pistons. Ford’s “in house” rebuilds are probably the major source of those pistons, but they likely were available as parts stock too.
The reasoning behind the .0025” and .005” pistons were that they could be installed at a certain wear point WITHOUT re-boring.
Shortblocks rebuilt at Ford branch plants received those size pistons. Ford’s “in house” rebuilds are probably the major source of those pistons, but they likely were available as parts stock too.
The reasoning behind the .0025” and .005” pistons were that they could be installed at a certain wear point WITHOUT re-boring.
Last edited by Adam on Wed Nov 25, 2020 12:55 pm, edited 1 time in total.
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Re: Ford Replacement Pistons
The 1921 parts book shows; 3-3/4", .0025, .03125 and .033. As Susanna said, this was in the days that many shops didn't tools like micrometers and were still using rulers.
I know the voices aren't real but damn they have some good ideas!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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Re: Ford Replacement Pistons
I have been collecting good oversized cast iron pistons to use. Last year I got a good 1920s block is good condition that needed a lite overhaul. So last winter I just had to hone out the cylinder holes and use four 0.005 oversized pistons with 0.010 over sized rings (filed to fit) to get it back in shape. Of course I did tighten up the mains and the rods a little, put in new valves, and new crank and cam gears to boot. I still am looking for good oversized cat iron pistons to use, got any? I have found all sort of sizes. Even have a 0.031, and 0.033.
1924 Model T Touring
1924 Model TT Truck
1930 Model A Pheaton
"It is great to be crazy ... It gives you a lot more options in life"
1924 Model TT Truck
1930 Model A Pheaton
"It is great to be crazy ... It gives you a lot more options in life"
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Re: Ford Replacement Pistons
The question is for Ford sizes so will list those from a Canadian parts book/
Standard, .001, .002, 003, .003, .004, .005, .010, .015, .020, .025, .030, .033, .035, .040, .045
But rings was only, standard, ,005, .015, .025, .035, and .045
After market ones is another story
Standard, .001, .002, 003, .003, .004, .005, .010, .015, .020, .025, .030, .033, .035, .040, .045
But rings was only, standard, ,005, .015, .025, .035, and .045
After market ones is another story