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anthonimartini
Joined: 17 Feb 2020
Posts: 115
Location: portland oregon
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 Posted: Sat Mar 27, 2021 3:02 am Post subject: ideolas compression calc |
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recently somebody posted a mirror to dans old compression calculator. i need this tool to finalize some calculations before i order parts. anybody have that link?
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saving a 1977 martini ... please help! (done)
87 924S GF's Daily
77 924 Safari (931 swap) daily
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formerly known as turbellion, lost password. |
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Cédric
Joined: 27 Aug 2004
Posts: 2114
Location: Sweden
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anthonimartini
Joined: 17 Feb 2020
Posts: 115
Location: portland oregon
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| Posted: Sat Mar 27, 2021 9:52 am Post subject: |
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i have that one i thought there was another version that had a option for the 931and vw flattop combo. is was hosted bu thewayback machine i think.
_________________
saving a 1977 martini ... please help! (done)
87 924S GF's Daily
77 924 Safari (931 swap) daily
79 MochaSchwartz work in progress
Instagram @anthoni.jpeg
formerly known as turbellion, lost password. |
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jacobroufa
Joined: 18 Nov 2016
Posts: 332
Location: Rockford, IL
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| Posted: Sun Mar 28, 2021 2:17 am Post subject: |
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I own the 924.terribly.fun domain -- I snagged a bunch of the calcs off of Dan's site before it went down. Let me look and see if I can find the one you're talking about...
If you go to the index by the way, you can see all that is there. http://924.terribly.fun has a listing and it is mostly spreadsheets. The code for the calculator was some wysiwyg generated thing; there might be an option commented out that I can try to find.
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1980 Porsche 931
1981 Porsche 924 Weissach |
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safe
Joined: 18 Mar 2017
Posts: 261
Location: Sweden
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| Posted: Sun Mar 28, 2021 7:23 pm Post subject: |
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| anthonimartini wrote: | | i have that one i thought there was another version that had a option for the 931and vw flattop combo. is was hosted bu thewayback machine i think. |
Just change the piston dish volume to 0 and the compression height to that of the flat tops.
But the calculator is just an approximation. For accurate numbers you will have to measure actual parts on the actual engine.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, under EFI and turbo conversion |
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anthonimartini
Joined: 17 Feb 2020
Posts: 115
Location: portland oregon
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| Posted: Mon Mar 29, 2021 2:22 am Post subject: |
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yeah i have ordered a burette so i can see what my head volume is. im ordering the 88mm pistons on monday. ill rough assemble my engine soon and see what it actually is. if the compression is too low ill get the block decked. this is all going on a block that has bad std bores so it needs to be bored out to 88 first. it seems i hit a dead end on using the bmw rods with the big end being way too narrow. i could probably run them with no real ill effect but im just going to lighten to stock rods and rebush.
_________________
saving a 1977 martini ... please help! (done)
87 924S GF's Daily
77 924 Safari (931 swap) daily
79 MochaSchwartz work in progress
Instagram @anthoni.jpeg
formerly known as turbellion, lost password. |
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