flycutting-half done with pics
Joined: Nov 2001
Posts: 8,484
Likes: 0
From: Cecil County Raceway!!!
Originally Posted by mikey
I designed a tool that cuts them to the same depth every time. Here is the finished pistons:
those exhaust cuts look like different depths to me...look how "tall" the cuts are and how they vary...equal cuts should be equal size (since valve angle is constant)
This was the motor that the cutter was designed on. The piston on the right was the first one and I was fooling around with different cutter sizes. It is wider than the rest but not deeper. The way that the cutter is designed, it is impossible to cut too deep. On the other hand if the piston is not at perfect TDC, the cuts can be too shallow.
This motor went on to make 502rwhp and 437 rwtq (in sig).
This motor went on to make 502rwhp and 437 rwtq (in sig).
Joined: Nov 2001
Posts: 8,484
Likes: 0
From: Cecil County Raceway!!!
Originally Posted by mikey
This was the motor that the cutter was designed on. The piston on the right was the first one and I was fooling around with different cutter sizes. It is wider than the rest but not deeper. The way that the cutter is designed, it is impossible to cut too deep. On the other hand if the piston is not at perfect TDC, the cuts can be too shallow.
This motor went on to make 502rwhp and 437 rwtq (in sig).
This motor went on to make 502rwhp and 437 rwtq (in sig).
TECH Fanatic
Joined: Dec 2002
Posts: 1,084
Likes: 0
From: Bring it........ b*tch
Originally Posted by mikey
This was the motor that the cutter was designed on. The piston on the right was the first one and I was fooling around with different cutter sizes. It is wider than the rest but not deeper. The way that the cutter is designed, it is impossible to cut too deep. On the other hand if the piston is not at perfect TDC, the cuts can be too shallow.
This motor went on to make 502rwhp and 437 rwtq (in sig).
This motor went on to make 502rwhp and 437 rwtq (in sig).
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Originally Posted by JF WS6
Hey Mikey, how deep did you end up cutting those pistons? I've got your dominator cam installed, I'm just waiting to get my heads back for the car. I decided to cut the pistons and run the 1.8 rockers.
We just tested strength per thickness of the factory pistons. With anything more than .100 out of them, user beware. Add juice and spin to 7000 and you're asking for it. High compression apps. should follow the same warning. I'm not saying anything but be careful. I know many that have cut more, as well as doing it myself for the last couple lumpy cam jobs. Now after testing strengths, it's .100 or after-market pistons for me...I certainly wouldn't guarantee negative results, it's just a freindly warning for those that just haven't given it any thought 
Also, Gomer's "All of mine are different sizes, and it is still together." statement subliminally brings up another point. It is important to get them as close to the same depths as possible, especially if you're not having the assembly balanced afterward. With different amounts removed, not only will compression differ between cylinders, different piston weights can really throw an engine off-balance. Just another freindly be careful for those that just haven't given it any thought
Also, Gomer's "All of mine are different sizes, and it is still together." statement subliminally brings up another point. It is important to get them as close to the same depths as possible, especially if you're not having the assembly balanced afterward. With different amounts removed, not only will compression differ between cylinders, different piston weights can really throw an engine off-balance. Just another freindly be careful for those that just haven't given it any thought
Originally Posted by NoseUp
We just tested strength per thickness of the factory pistons. With anything more than .100 out of them, user beware. Add juice and spin to 7000 and you're asking for it. High compression apps. should follow the same warning. I'm not saying anything but be careful. I know many that have cut more, as well as doing it myself for the last couple lumpy cam jobs. Now after testing strengths, it's .100 or after-market pistons for me...I certainly wouldn't guarantee negative results, it's just a freindly warning for those that just haven't given it any thought
Also, Gomer's "All of mine are different sizes, and it is still together." statement subliminally brings up another point. It is important to get them as close to the same depths as possible, especially if you're not having the assembly balanced afterward. With different amounts removed, not only will compression differ between cylinders, different piston weights can really throw an engine off-balance. Just another freindly be careful for those that just haven't given it any thought
Also, Gomer's "All of mine are different sizes, and it is still together." statement subliminally brings up another point. It is important to get them as close to the same depths as possible, especially if you're not having the assembly balanced afterward. With different amounts removed, not only will compression differ between cylinders, different piston weights can really throw an engine off-balance. Just another freindly be careful for those that just haven't given it any thought
Carter