NassyVette

iTrader: (22)

Just wondering if anyone has a link that shows how to flycut stock pistons? If nothing like that exists, can someone explain the process for me? How involved is it?

TIA

~JOSHUA

iTrader: (92)

I know for sure there is a thread here about that. I don't know of a current website with the info on it. If you search there's a good thread that had photos and all. It must be over a year old by now though. Good luck!

krexken

It's really not that difficult but I'm not sure what most folks here use to spin the cutter valve with the engine up under the cowl. I'm guessing a good 90 degree drill. Anyways, you basically replace the stock valve with a valve that has a cutter ground into the face of it. You usually run the piston to TDC, install the head with cutter, push down on cutter until it touches top of piston, set tool depth(I use a feeler gauge in between collar and valve guide boss to set my collar which is set screwed to the valve stem), drill until collar touches the top of the valve guide. I've always used a spare head to do this with so I wouldn't mess up the top of the guides or valve seats.

ninobrn99

iTrader: (8)

http://www.ffhp.net/tech_Isky.htm

NassyVette

iTrader: (22)

Thank You!

Just what I needed!

ninobrn99

iTrader: (8)

welcome
Nino

Nittany_marine

iTrader: (7)

Awesome. I needed that too......you gotta love the wealth of knowledge on here.

GuitsBoy

iTrader: (4)

Any harm in flycutting if you dont need to? Like lets just say that youre cutting it close with P to V but still within spec, would flycutting just give you extra protection or would there be a downside? How far down can you safely notch the stock pistons?

xfactor_pitbulls

iTrader: (16)

You lose alittle compression depending on depth of cut. It also weakens the top of the piston some, also depending on depth of cut. Not a real issue unless you are spraying. Some people say max cut is .100" others say it is .080". I cut mine about .070". Just make sure if you cut the notches yourself to have a guide heads to use. You have to have half a head with a guide and even ground past that to fit the cutter. Another way to measure the cuts is to use a mic and just measure the width of the cut. Obviously the deeper you go the wider the cut gets.

Brandon

GuitsBoy

iTrader: (4)

You cant fit the cutter under the stock heads when you pull them off? Who sells the cutter? (apparently isky)

xfactor_pitbulls

iTrader: (16)

No you cant fit the cutter in stock heads. Its like a 2.15" O.D. So you have to cut out the seat and still grind some more to get it to clear the combustion chamber.

Brandon

GuitsBoy

iTrader: (4)

I think ill put my valve reliefes in the old fashioned way then. 7500 RPM on stock pushrods and valvesprings.

Louis

iTrader: (7)

We offer a dummy head and flycutter for rent if anyone is interested