Can You Still Call An Engine "unopened" If You Have Aftermarket Cams?

[Duncan]

not relevant to dohc turbo cars...we don't have to open the motor to make big improvements...

only means something to dinosaur drivers

[Dale FZ1]

Cam change alters volumetric efficiency.

I'd call it "opened" for cam, compression, or turbo change. They all change the way the engine breathes.

Modified is modified.

[GTRgeoff]

Cams take me at most 1 hour to swap so I consider them as "unopened".

Head off for improvement, slugs/rods and all that is opened.

Whatcha floggin' mate

[Abo Bob]

Nuthin. Just getting consensus.

[AdamsR33]

To me the head is the lid, so if you don't take the head off mate then it isn't opened. opened as i think , to get into the motor is to open it, removing/replacing cams are really on the outside of the motor. Unopened IMO.

[Rexx]

Replacing cams ...unopened

bottom end ........opened

Yup thats what I've heard as well

[Cubes]

Unopened to myself means standard mechanicals that have not been touched.

Bolt ons only.

An LS1 or old GM 5ltr. Is that unopened when changing cams? No.

I believe it must be an equal playing field, whats unopened for one motor can't be opened for another just because its easier to due to its design.

But from a literal sense.. A motor is only opened when the head is cracked off/removed.

[Duncan]

How on earth do you change the bottom end by taking the head off? I think you would be better off trying to remove the sump. Taking the head off gives you access to absolutely nothing

[Abo Bob]

Yeah but you can at least look at the pistons.