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friethmiller |
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#1
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Senior Member ![]() ![]() ![]() Group: Members Posts: 937 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region ![]() ![]() |
[A softball question for the Ninja and/or others]
This is the cam card that came with my 2357 engine, which was originally built by Rimco/Fat (long block) a few years ago. Can someone explain why with an intake/exhaust of 448, the lift was only set to 327 degrees? I'm about to rebuild my motor and a lot of focus will be directed at piston "deck clearance" and the valve train geometry that wasn't set correctly. Thanks. ![]() |
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technicalninja |
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#2
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,531 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region ![]() ![]() |
Changing cam in a T4 means "all the way down".
I'd do a bunch of little tests BEFORE teardown. I'd properly tune what you have FIRST! You running a WB yet? No way I'd make big ass changes before I knew exactly what I wanted to improve. I'd have 1 or 2 WBs (depending on exhaust). CHTs on all plugs (for testing, for daily use just one under #3) and EGT (prefer 4 during provisioning). Knock sensors on both banks. I'd be stand-alone FI as well. COP, Sequential with 1000cc injectors. Center of injection pulse timed to intake lobe centerline. Only inject into a moving airstream! I'd want to be able to internally log a bunch of stuff And after a major amount of tuning, I'd be ecstatic with 200... Which IS SAD! The base Boxster I have (2.5L) has 200 stock! |
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