SSwt00SS

iTrader: (18)

yeah, .040" PTV clearance is what Gunnar at Patriot Performance said. regardless I will do as you suggest and flycut the pistons anyways just for 'peace of mind'. thanks for all your help brad...

brad8266

iTrader: (23)

No problem man, flycutting cant hurt at all especially if you already have the heads off anyway. And if you do flycut you can run a thinner head gasket too and tighten up the quench area.

GuitsBoy

iTrader: (4)

Gunnar suggested a .040 P to V clearance? What exactly were his words, maybe he didnt mean P to V? Anyway I certainly wouldnt run that tight.

CODE4LS1

iTrader: (4)

I'm a little lost here, and sorry for the hijack. How do you fly cut pistons? What tools are used and can it be done while still in the block?

The Alchemist

iTrader: (19)

Maybe he meant quench, run a 0.040" quench, which would make sense.

I've been debating this same question for a while as well, I'm not sure how much my heads were milled, and I want to run a thinner head gasket to reduce my quench, but I don't want to run into PtoV clearance issues.

It shouldn't be much of an issue as I'm running the TR224, but we will see in the coming weeks when I begin to pull the heads.

SSwt00SS

iTrader: (18)

ok, what is a quench and where would it go/be installed? i asked Gunnar what the typical valve to piston clearance should be and he said .040" of an inch regardless of the heads used. still said plenty of people run the Torquer v2 with no clearance issues and no need to flycut the pistons...

GuitsBoy

iTrader: (4)

I can almost guarantee you misunderstood him. Or he misunderstood you. Theres some sort of misunderstanding going on here.

Different heads have different P to V clearances, so it cant be "regardless of the head used".

Plenty of people do run the torquer2 without flycuts. But once you mill the heads past .015 or .020, you need to start looking into your picton to valve clearance. The more you mill, the closer it will become.

Quench is the space between the piston at TDC and the flat bit of head (teh top of the heart shape). The tighter it is, the better the fuel air mixture. You dont want the piston to collide with the head though.

My guess is that you asked (or he thought you meant) piston to head clearance. This would be quench. This does not change no matter which head you use or now much you mill it. Piston to valve on the other hand certainly will!

SSwt00SS

iTrader: (18)

understandable, but they do not mill down their heads to get the 59cc, they weld them up, which means i would have more room correct? so if i did not need to flycut, i would not have to. is this right?

brad8266

iTrader: (23)

Yes if they are welded chambers you have a bunch more room to work with. If the clearances are large enough there is no need to flycut, the only tried and true way to check PTVC though is to perform a clay test on the combo.

SSwt00SS

iTrader: (18)

yes, i will be getting a clay test done before hand. if I do have to flycut my pistons, what exactly is the process and average cost? is this something that can be done with the engine in the car?

basically i do not wish to open up a can of worms just to go with a bigger cam. if that is the case, i will look else where for more power (mainly TQ is what im looking for), TB, U/D pulley, perhaps even a Fast 90/90 combo...

brad8266

iTrader: (23)

You just do it when the heads are off, you do your cuts in the piston tops and then clean everything out really good. You can do it yourself if you buy/borrow the tools.

SVThis

iTrader: (2)

i run a comp 231/237 .585/.595 112 cam with the same exact heads your asking about...you'll be fine