Free VG33 top end power mod

[kiwipathy]

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 ... ctions.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, or if anyone has done it before.

[Slumpert]

It is too early for me to do the math...

So your saying you took off the camshaft sprockets, switched them, then put the timing belt back on with one cam mis-aligned by one tooth and everything works better than before?

Very creative, sounds easy for the readers to really screw up the engine though.. Maybe do a before and after video and include dyno runs showing the power difference.

[kiwipathy]

Yeah that's exactly what I did.

Obviously if someone doesnt understand exactly what I did and how to do it, then its probably best if they dont try it, I am in no way responsible for your engine!

The only dyno result I have is the butt-dyno, sorry.