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so a couple of thoughts.
Its hard, really hard to do back to back tests. Because the grooves lower the compression and the optimal piston to head clearance is ~70 thou.
So the compression gets lowered significantly, so motors that already have significantly LOW compression, there seems no reason to make it worse.
On volvo motors there have been a number of people that have tried the singh grooves.
Most aftermarket head builders are focused on fast burn heads and high compression set-ups.
There are a few and I mean a few people that have dedicated themselves to making the singh grooves competitive.
Please don't feel like I am slamming the groove theory, as it has some merit, I just believe there are a few other things we can do that far outway cutting grooves in a cast iron head–thinner headgasket, raised compression, cleaned up heads, and offset wristpins would be a quick start.
Jonathan
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