Hey all, I'm new here but thought I'd share a mod I have done to my pathy.
I guess you all know the VG33 is great down low but has absolutely nothing up top, so I decided to remedy that by turning my stock cam gears into adjustable ones like this: http://www.mygen.com/users/dbruce/myz31/cam_gear_instructions.htm
When I got the engine apart and the gears on the bench I saw that the stock notches don't quite line up with the timing marks and that got me thinking, what if I swapped gears left to right?
There is 40 teeth on each gear so 9 degrees for each tooth (18 deg crank). I measured the left gear notch to be 3 deg retarded (6 crank) and the right one 1.5 deg advanced (3 crank). So if you swap then left to right you end up with it 9 crank deg retarded on the right and 9 deg advanced on the left. If you skip the left one back a tooth (anticlockwise looking at the gear) that's 18 crank deg so they both end up 9 deg retarded, just like the max adjustment on the gears I linked above.
I know that's quite a lot of cam movement but it has really woken my VG up! It actually goes when I put my foot down at 100ks now, instead of just getting louder. I hasn't seemed to lose a lot down low either, but I never really cared about that, I just want to tow my boat at decent speeds up steep hills, which is why I got the petrol one in the first place.
So this mod probably won't be for everyone especially offroaders, but if you are keen its worth a go for the couple of hours effort, and completely reversible if you don't like it.
I'd be interested to hear from anyone who tries it what they think.