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W / G226 Mods

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frnkeore View Drop Down
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    Posted: 20 Jun 2019 at 1:59pm
It looks like I've got the basic G226 dimensions fairly close so, I thought I'd do some things with the figures that might be interesting.

Since this is the pulling part of the forum, everything will deal with the 4.125 bore. If you deal with the 4.00" bore, the figures will be 14 CI less and about .2 less compression. I don't know if the 4.125 piston/sleeve kits use the std stock, 4.000" bore, 2.530 CH but, I will assume that for all my data. All data, is based on a deck height of 12.656 and a rod length of 7.500.

First up, for those that want custom pistons made, the compression height of the piston, for different compression ratio's.

4.125" Bore
2.590 = 8.01
2.630 = 8.52
2.670 = 9.06
2.700 = 9.51
2.730 = 10.02

So, each increase in CH, of ~.035, will give you a 1/2 point of compression.

Next up, is the stock CH of 2.530 and a welded, offset ground crankshaft to a stroke of 4.750.


You can also increase the stroke to 4.800 and get 257 CI and a CR of 9.75 with the same CH of 2.530.

I hope this helps someone in their engine build.

Frank
1959 D17 Series I #24001+
'55 & '59 Ford 850 & 861
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mjbower Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2019 at 9:01am
That's good information thanks for doing the math answers a lot of questions.
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frnkeore View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frnkeore Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jun 2019 at 11:01am
Your welcome, I'm happy to help.
Frank
1959 D17 Series I #24001+
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Carl(NWWI) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Carl(NWWI) Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jul 2019 at 11:10pm
So what would the compression ratio be for the 4.125 flat top pistons?

Edited by Carl(NWWI) - 11 Jul 2019 at 11:11pm
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frnkeore View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frnkeore Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jul 2019 at 1:10am
11.016
Frank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d17brown Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 2019 at 7:11pm
whats compression ratio, for 4.6 bore, 6 inch stroke
phil
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frnkeore View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frnkeore Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 2019 at 7:34pm
Way to much Confused
If you use the standard compression height of 2.53 and standard 7.5 rods, the piston will stick out of the block, 3/8".

If you can give me the C/H of the pistons and rod length you use, I can give you a answer for flat top pistons, if cupped, I need the cup volume, too.

Frank
1959 D17 Series I #24001+
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d17brown Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jul 2019 at 12:48pm
Farmall h rods. Flat top pistons
phil
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frnkeore Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2019 at 12:12am
Do you or anyone else, have the center to center length of the Farmall H rods?




Edited by frnkeore - 19 Jul 2019 at 12:44pm
Frank
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'55 & '59 Ford 850 & 861
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frnkeore Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2019 at 12:41pm
I found a TRW listing for the H rods. They are appox 7.27 C/C. I will still need the compression height of your pistons, to do the calculation.

The C/H is the distance from the top of the piston, to the center of the wrist pin or if you can give me the distance from the edge of the wrist pin bore, to the top and the diameter of the wrist pin, I can get the C/H.

BTW, that is quite a bit of rod angle, 24.37 deg.


Edited by frnkeore - 19 Jul 2019 at 12:45pm
Frank
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Ferguson TO 35 Deluxe, Oliver 70
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d17brown Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2019 at 8:28pm
i think it is 2.25
phil
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frnkeore Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2019 at 1:48am
I don't think the C/H can be 2.25. That gives a CR of 29.78. To high for alcohol and I don't think diesel would even hold together at that CR.

 I changed the C/H to 1.86 and that gives 11.03. With the short cam timing of these engines, I think it would take Av gas to work with that CR.





Edited by frnkeore - 20 Jul 2019 at 1:49am
Frank
1959 D17 Series I #24001+
'55 & '59 Ford 850 & 861
Ferguson TO 35 Deluxe, Oliver 70
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Post Options Post Options   Thanks (0) Thanks(0)   Quote danno067 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jul 2019 at 7:54pm
frnkeore, I'm a little late but i have one that was dumped in my lap that someone else started. Could you run the math on this.

Stroke  5.750
Bore   4.560
Piston to Deck height  .642
Rod length pin to pin 8"
Piston comp height 1.1605
Thanks much.

Edited by danno067 - 29 Jul 2019 at 7:55pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frnkeore Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jul 2019 at 12:51pm
I take it that this isn't a G226 block? the deck height comes out different and I don't think you can get a 5.75 bore in a G226.

You didn't give a head gasket thickness so, I used a custom .040 copper one.

Frank
1959 D17 Series I #24001+
'55 & '59 Ford 850 & 861
Ferguson TO 35 Deluxe, Oliver 70
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