VVT cams dominating LS3 conversion cams at the track...You be the judge.

[Nightmare2012]

Originally Posted by TrackZero

I think this is only for the really stout grinds. Which did remind me, I had to fly cut my pistons as well, the whole process was simple though. Some painters tape and the correct tool, and it is simple.

They are ls3s so they don't have the -2cc piston reliefs like we do

[Muddflap]

If you are LS3 you have to flycut reguardless because the of relief valves. My deal wasn't so much the flycutting as the tops of the pistons have enough meat on them. My deal was without taking them out and weighing them how do you know they will all weigh the same aft flycutting? Therefore you could very easily be out of balance and wear your engine out faster/blow it up easier.

[Muddflap]

I know some will say that little bit won't matter but if you stop and think about it and ill give an example.
When pistons are made lets just say they are weighed and labeled 1 thru 4. When they are put into a motor they put all 1's in this motor, all 2's in another ect. They don't mix 1's and 4's or even 1's and 2's.

[thahemp]

Originally Posted by Muddflap

I know some will say that little bit won't matter but if you stop and think about it and ill give an example.
When pistons are made lets just say they are weighed and labeled 1 thru 4. When they are put into a motor they put all 1's in this motor, all 2's in another ect. They don't mix 1's and 4's or even 1's and 2's.

The difference in weight between pistons will be incredibly tiny. If you figure I get every piston within 0.010" of each other. The difference in weight is actually only the tolerance of my cuts, not the total amount removed.

[Nightmare2012]

[Old as Dirt]

Would a 232°/235° @ .050 with .612"/.600" lift on a 110°LSA and running PAC 1518's be a good stick setup for a Camaro on the street?

[Muddflap]

Originally Posted by thahemp

The difference in weight between pistons will be incredibly tiny. If you figure I get every piston within 0.010" of each other. The difference in weight is actually only the tolerance of my cuts, not the total amount removed.

I understand that but my thing is without taking them out and weighing them how will you really know how far they might be off just buy measuring the depth of the cut. If one piston is already a little light from the factory and it get a little more cut out than the others do how will it effect the engines far as lasting because it will be even more out of balance to an extent.

That was one of my biggest concerns anyway, and without knowing 100% I wasn't willing to take the chance and I didn't want to tear my motor completely down do make sure.

[Muddflap]

With all that said I couldn't find anything online that said what an acceptable balance difference was or is.

[Muddflap]

If anything happens to this motor down the road I will rebuild for VVT.

[Nightmare2012]

If your talking vvt idk much about that but if its a ls3 cam it has a 13.5 overlap the night fury has a 10.0 overlap so its a bit on the aggressive side

[Muddflap]

Originally Posted by Old as Dirt

Would a 232°/235° @ .050 with .612"/.600" lift on a 110°LSA and running PAC 1518's be a good stick setup for a Camaro on the street?

You will probably have to talk with Rhino79 with GPI or Mike with NewEra about that.

[thahemp]

Originally Posted by Muddflap

I understand that but my thing is without taking them out and weighing them how will you really know how far they might be off just buy measuring the depth of the cut. If one piston is already a little light from the factory and it get a little more cut out than the others do how will it effect the engines far as lasting because it will be even more out of balance to an extent.

That was one of my biggest concerns anyway, and without knowing 100% I wasn't willing to take the chance and I didn't want to tear my motor completely down do make sure.

You have actually got me thinking about this. I still don't believe it's an issue, but it's definitely worth looking into. I'll try and model the 2 cylinders (piston and fly cut) in Solidworks next week and take some screenshots. It'll do mass properties on the cross section too, so we'll know approximately what it amounts to.

[Muddflap]

Originally Posted by thahemp

You have actually got me thinking about this. I still don't believe it's an issue, but it's definitely worth looking into. I'll try and model the 2 cylinders (piston and fly cut) in Solidworks next week and take some screenshots. It'll do mass properties on the cross section too, so we'll know approximately what it amounts to.

Keep me updated because I would really like to know. Maybe Rhino or someone with alot more knowledge than i have will chime in and can shed some light on this.

[thahemp]

Sure.