 What's Compression Ratio got to do with it? |
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| ThinAir |
  Jun 6 2011, 11:23 PM
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Best friends  Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region 
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When I built my 2.0L I had the understanding that if you wanted to run Regular fuel the highest compression ratio you could have was 8:1. I don't have any idea now where that came from.
In the thread about his air-cooled event, Jake just posted this: "The 356 engine is a 2.4, it made 224HP @ 9:1 CR on pump gas." Now I know that there is more to one of Jake's engines than just the CR, but it got me to wondering: 1. What is the maximum CR you can run with Regular fuel? 2. What is the relationship of CR to performance? Do you always get more HP by running higher CR if everything else is the same? Understanding this concept might be helpful the next time someone builds an engine, buys one from Jake, or has one built for them by someone else. |
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Posts in this topic
ThinAir What's Compression Ratio got to do with it? Jun 6 2011, 11:23 PM
ThinAir It just occurred to me that perhaps the highest CR... Jun 6 2011, 11:32 PM messix too many variables to give a short answer.
combus... Jun 6 2011, 11:38 PM Tom_T CR is the key to HP (& TQ too), cuz it's t... Jun 6 2011, 11:47 PM
Bleyseng
CR is the key to HP (& TQ too), cuz it's ... Jun 7 2011, 09:51 AM Vacca Rabite Pump gas means only that it came from a commercial... Jun 7 2011, 07:45 AM detoxcowboy The bolts in the cases can only take so much.. Jun 7 2011, 10:15 AM Prospectfarms
When I built my 2.0L I had the understanding that... Jun 8 2011, 12:49 PM Dave_Darling By default, when people talk about compression rat... Jun 8 2011, 01:35 PM Jake Raby
Everything. Jun 8 2011, 05:57 PM Madswede [EDIT: I just realized that I'm once again doi... Jun 9 2011, 02:04 PM ThinAir
... but then again, since you're carb'd ... Jun 9 2011, 03:15 PM Madswede
... but then again, since you're carb'd... Jun 10 2011, 11:16 AM Prospectfarms I don't think its permitted to cite links to o... Jun 9 2011, 10:17 PM Dave_Darling
I don't think its permitted to cite links to ... Jun 10 2011, 07:20 PM Prospectfarms
I don't think its permitted to cite links to... Jun 10 2011, 09:17 PM Maltese Falcon ..and then add in some un-natural aspiration (boos... Jun 9 2011, 10:52 PM Don M Compression ratio is directly related to environme... Jun 11 2011, 08:34 AM ThinAir I'm not planning on an engine build anytime so... Jun 12 2011, 06:42 PM  |
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