| If you use 500+ mechanical-lash cams, you will drop your dynamic compression ratio to around 6.65:1 with stock TT pistons. With VTC off, you're looking at around 5.5:1! Lower with combustion chamber deshrouding work. That cam is so large that it will practically require a higher static CR. If you don't believe me, put your numbers into this dynamic cr calculator and see for yourself: [ http://www.wallaceracing.com/dynamic-cr.php ] Cam card: [ http://www.jimwolftechnology.com/wolfpdf/CAM_SPEC_CARD_VG30DETT.pdf ] Engines typically make the best power in the 7.5-8.5 dynamic CR range, as much as 9:1. Sure, you can advance the intake timing as much as 10 degrees with the BDE cams, but this won't change the larger duration. [ http://cochise.uia.net/pkelley2/DynamicCR.html ] And actually, altering the intake closing point will typically help more with cranking pressure: [ http://www.enginebasics.com/Engine%20Basics%20Root%20Folder/Camshaft%20Timing.html ] And unless you have CNC data, molds, or some great pictures of the port work on the various heads, we have no idea what was done. Hand porting can vary wildly between heads. What do you mean by "extreme"? Greg, you keep claiming many things that go against common consensus on engine building. I'm open to your points but I'd love to see some dyno data or references to back them up. Still waiting.
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16:08:17 06/22/15
