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frnkeore 
Silver Level
Joined: 07 May 2019
Location: Southern Oregon
Points: 362
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 Topic: D17/G226 compression Ratio & Engine info
Posted: 18 Jun 2019 at 5:13pm |
In a thread, a while back, I said I would calculate the cup in a G226
engine and post the results. I was sent a piston, with a casting # of
229717, in the cup of the piston, it's marked 229718. It was sent to me
by Strokendiesel002 and I thank him, very much. By my measurement, the cup is 56cc and the compression height is 2.530. I guestimated the the head gasket was .040 thick and that the inside diameter was 4.18". If anyone has the actual figures, I can modify the out put but, this gets it pretty close. .040 is pretty common for thickness and with the overbore kits, at 4.125 the inside diameter has to be larger than that. I also used DrAllis deck height dimension of 12.656. If anyone has different info from what I'm showing, or any mistakes I've made, please let me know. I will re-verify the 56cc in the next few days. Here is the results: 
Edited by frnkeore - 19 Jun 2019 at 12:18pm
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Frank
1959 D17 Series I #24001+, '59 D14
'55 & '59 Ford 850 & 861
Ferguson TO 35 Deluxe, Oliver 70 and 5 more.
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DrAllis
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Joined: 12 Sep 2009
Points: 20860
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Posted: 19 Jun 2019 at 7:29am |
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You're not too far off at that figure. A-C advertised comp ratio to be 7.25 to 1 on a D-17 engine. I think your head gasket is much closer to .060" which would bring your calculated number down a bit.
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frnkeore
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Joined: 07 May 2019
Location: Southern Oregon
Points: 362
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Posted: 19 Jun 2019 at 12:13pm |
Doc, Pretty much right on! Does anyone have a used head gasket that they can measure for thickness? 
Edited by frnkeore - 19 Jun 2019 at 12:15pm
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Frank
1959 D17 Series I #24001+, '59 D14
'55 & '59 Ford 850 & 861
Ferguson TO 35 Deluxe, Oliver 70 and 5 more.
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CAL(KS)
Orange Level
Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3787
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Posted: 19 Jun 2019 at 12:33pm |
have a link for that calculator?
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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frnkeore
Silver Level
Joined: 07 May 2019
Location: Southern Oregon
Points: 362
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Posted: 19 Jun 2019 at 12:54pm |
Sure, there are others around, too but, I like this one the best, it covers all variables. http://www.diamondracing.net/tools/
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Frank
1959 D17 Series I #24001+, '59 D14
'55 & '59 Ford 850 & 861
Ferguson TO 35 Deluxe, Oliver 70 and 5 more.
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Strokendiesel002
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Joined: 04 Apr 2019
Location: 53158
Points: 252
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Posted: 19 Jun 2019 at 4:32pm |
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Neat! Thanks for sharing!
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DrAllis
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Posted: 20 Jun 2019 at 7:15am |
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Everything except valve head standout, which technically should be covered in chamber volume, which technically doesn't apply on a perfectly flat cylinder head.
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frnkeore
Silver Level
Joined: 07 May 2019
Location: Southern Oregon
Points: 362
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Posted: 20 Jun 2019 at 9:18pm |
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Doc.
I did think of that but it's a variable, all by itself.
The margin will vary and the depth that you narrow the top of the seat.
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Frank
1959 D17 Series I #24001+, '59 D14
'55 & '59 Ford 850 & 861
Ferguson TO 35 Deluxe, Oliver 70 and 5 more.
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