 2.0 L race engine deck height, How little dare I? |
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| Driver174 |
 Mar 7 2018, 01:02 AM
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#1
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Member  Group: Members Posts: 120 Joined: 2-February 17 From: Nevada Member No.: 20,806 Region Association: None 
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914-4, stock crankshaft, Stock Jugs, H-Beam rods, JE Pistons, 7k redline; how tight can I safely go? I've heard that a deck height of 0.050" is a safe amount. Can I go 0.040" without risking interference issues?
Thanks, Jim |
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| Charles Freeborn |
Jan 27 2022, 05:32 PM
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#2
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Member Group: Members Posts: 283 Joined: 21-May 14 From: United States Member No.: 17,377 Region Association: Pacific Northwest |
Ressurecting this thread as I'm unable to run the spreadsheet (for some reason my mac doesn't like the .xls file) to calculate shims / compression ratio change. In short I want to reduce the compression of an engine from 12:1 or thereabouts to closer to 10:1.
Thanks. |
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| stownsen914 |
Jan 28 2022, 07:58 PM
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#3
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Senior Member Group: Members Posts: 947 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
QUOTE(Charles Freeborn @ Jan 27 2022, 06:32 PM)  Ressurecting this thread as I'm unable to run the spreadsheet (for some reason my mac doesn't like the .xls file) to calculate shims / compression ratio change. In short I want to reduce the compression of an engine from 12:1 or thereabouts to closer to 10:1. Thanks. I'll be curious what folks say about type 4 motors, but I know for 911s you don't want to have a deck height more than .060". Better to reduce compression in the dome rather than at the perimeter of the piston. Shimming to reduce compression does the latter, of course. |
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Posts in this topic
Driver174 2.0 L race engine deck height Mar 7 2018, 01:02 AM
Mblizzard Others may have more specific information but I wo... Mar 7 2018, 07:50 AM
Driver174 I'm really just concerned with deck clearance;... Mar 7 2018, 10:55 AM Racer Chris With CrMo rods and forged pistons you can set the ... Mar 7 2018, 11:02 AM Mblizzard I read here somewhere that the deck height require... Mar 7 2018, 11:21 AM yeahmag I’m around 0.038” on stock 2L rods and crank, ... Mar 9 2018, 11:03 AM Racer Chris
I’m around 0.038” on stock 2L rods and crank,... Mar 9 2018, 11:20 AM yeahmag Not sure if you remember Evan Fullerton, but he ra... Mar 9 2018, 11:47 AM brilliantrot
Not sure if you remember Evan Fullerton, but he r... Mar 14 2018, 01:05 PM Driver174 Thanks for the input guys; I'm feeling better ... Mar 15 2018, 09:58 PM |
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