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ideolas compression calc

 
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anthonimartini  



Joined: 17 Feb 2020
Posts: 115
Location: portland oregon

PostPosted: Sat Mar 27, 2021 3:02 am    Post subject: ideolas compression calc Reply with quote

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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CÚdric  



Joined: 27 Aug 2004
Posts: 2114
Location: Sweden

PostPosted: Sat Mar 27, 2021 5:26 am    Post subject: Reply with quote

http://924.terribly.fun/compression/
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anthonimartini  



Joined: 17 Feb 2020
Posts: 115
Location: portland oregon

PostPosted: Sat Mar 27, 2021 9:52 am    Post subject: Reply with quote

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.
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jacobroufa  



Joined: 18 Nov 2016
Posts: 332
Location: Rockford, IL

PostPosted: Sun Mar 28, 2021 2:17 am    Post subject: Reply with quote

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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safe  



Joined: 18 Mar 2017
Posts: 261
Location: Sweden

PostPosted: Sun Mar 28, 2021 7:23 pm    Post subject: Reply with quote

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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anthonimartini  



Joined: 17 Feb 2020
Posts: 115
Location: portland oregon

PostPosted: Mon Mar 29, 2021 2:22 am    Post subject: Reply with quote

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.
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