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Thread: Added Lift

  1. #26




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    also notice the grind was for duration, not for lift. There is a max lift on these motors that if exceeded, gain you nothing. On the 2.6, you can get valves that are swirl polished and reduced stem at the valve head for better flow as well as a larger head. not sure if the 2.4 has valves like that available.
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  2. #27

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    ???
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    My research indicates - ALL 4 cyl Mitsubishi balance shaft engines have an undersquare bore to stroke ratio ???

  3. #28

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    Quote Originally Posted by claych View Post
    ???
    Humble respects ---
    My research indicates - ALL 4 cyl Mitsubishi balance shaft engines have an undersquare bore to stroke ratio ???
    Correct. Found this Mitsubishi enthusiasts page with a bunch of stats and engine designation numbers as a reference which might be good to add to a wiki page(?) - http://mitsipedia.info/index.php?title=Astron
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  4. #29

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    I will have to have a look. I'm assuming the 1.8 has the exhaust on the proper side like our trucks?

    I'm still leaning towards using the 2.0 head I have... I just wish there was an easy was to fill the voids with the air valves are...

    I wish I had the ability to Tig Weld... I would fill those in. You would get a crazy compression though which might not be good for turbocharging or supercharging.. since i still haven't made up my mind which I will do.

  5. #30

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    All of the SOHC 4G6X engines of this generation are configured this way. Using a complete head off a 4G62 should not only bump up compression, but the cam should be slightly more aggressive as well. Some engine builders who work with turbos are saying stuff like "build the best NA engine you can, then turbocharge it...". I'm not even close to being able to comment on the ethos behind that but having high compression on a forced induction engine sounds like a trip to detonation land.
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  6. #31

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    I do know the "Little Red Wagon" ran a 12.5 compression ratio Hemi with a Supercharger for years on the wheelstanding circuit.

    I would think forced induction and high compression would give you insane cylinder pressure... not of the good kind

  7. #32




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    there are 2 ways to look at high compression and turbo/supercharging - you can build boost faster with high compression, and control it with the ECM for spark and fuel, or not go near it. look at some of today's turbo motors - some are running high compression and have no issues. It is the tune than makes or breaks the motor. If you are going carbed, then that is a whole different story, as the carb has to be run rich and the distributor curve needs to retard a lot to prevent detonation.
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