I'm now up-dating MSA GX160 motors to the latest V13a regs for 2018 via cutting the valve seats with upper and lower cuts to the existing 45 degree cut. These will only become legal after 31st March.
I have put a lot of research into which angles work best and I am now consistently achieving fantastic gains on my dyno in the region of + 0.2-0.3 mean HP gains, with another 0.2-0.3 seconds of quicker acceleration.
Some may label this as BS, but I have now upgraded enough engines with the consistency, hard facts and before & after dyno data to know this is the absolute situation. My dyno is deadly accurate, hence I am confident in what I am saying.
Kindest regards
Knighty BEng (Hons) CEng FIMechE
PS - My phone number is changing to 0787 9427945 on 29th March 2018
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