 Ideal compression ratio on EFI 2056?, currently 9.2:1 |
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| VaccaRabite |
 Apr 6 2012, 01:33 PM
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En Garde!  Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region  |
Since my heads are off and I am SLOWLY converting my 2056 to megasquirt, I am rethinking some of my stuff.
What is the ideal compression ratio for my motor. I am willing to run 93 octane fuel - I run it now. I have a 9530 Raby cam and valve gear. 2056cc spark is going to be electronically controlled (maybe EDIS, maybe something else) I was thinking of dropping compression to 9.0 or maybe even 8.7. I want more compression then stock, but I want cooler head temps then I currently get (the engine has always run warm at the heads, and I can never use 5th on the freeway to keep temps down). My normal operating temps tend to be 360-380 and I'd like to back them down ~10 to 15 degrees. Head temps were measured on Cyl 3 with a compensated Dakota Digital CHT gauge. When I built the engine, I just set the deck height to .040 and figured out the CR later. I know better now, and am at a great point to correct it. Zach |
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Posts in this topic
Vacca Rabite Ideal compression ratio on EFI 2056? Apr 6 2012, 01:33 PM
blitZ I have 2056, dJet, 9550 cam and 9.0 compression an... Apr 6 2012, 03:06 PM orange914
Since my heads are off and I am SLOWLY converting... Apr 6 2012, 03:09 PM Tom_T Stock was only 7.6 USA & 8.0 Euro/RoW - so 8.7... Apr 6 2012, 03:14 PM Valy What's the spec of that cam? The dynamic CR de... Apr 6 2012, 03:34 PM yeahmag I ran that cam at 9:1 and it was about right. I wo... Apr 6 2012, 03:35 PM Jake Raby My 2056 in the 912E ran a 9530 with 9.7:1 and did ... Apr 6 2012, 03:44 PM yeahmag Jake, what were you running for timing? Just as a ... Apr 6 2012, 03:56 PM
Jake Raby
Jake, what were you running for timing? Just as a... Apr 6 2012, 04:04 PM Vacca Rabite Exhaust this time around are going to be 2.0 SSIs.... Apr 7 2012, 04:08 PM HAM Inc
You can't relate what works on a modern engi... Apr 8 2012, 10:06 AM  |
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