Dual cam-in-block V8?

[Jeff V.]

Rather than me reposting everything here, just go to the Corvette forum and read the first post.

https://www.corvetteforum.com/forums/c8 ... ncept.html

I'm wracking my brain trying to figure out what else that 2nd timing chain could be for, but I can't think of anything. Especially combined with that huge oil pump assembly. Has anyone got any other ideas, or could this really be an evolved XV8 style engine?

[ChargerX3]

Wonder if that ties into one of several things. Onboard electric start/helper motor, or if the VVT is chain based. Im not familiar with that motor, so its a bit hard to make out.

[Jeff V.]

Nobody outside of GM is familiar with that motor. That cutaway photo showed up for a fraction of a second inside an official GM teaser video that dropped on Monday.

[Chris GTO TT]

That's super weird looking

[aaronatstate]

I don't think its for a second cam for a few reasons. First, you can't see the second cam above the first cam, or even anyplace where the second cam bearings would sit. Second it looks like the second chain angles inward (like it is going to a smaller gear), where if it was going to a second cam, it'd be straight.

[Jeff V.]

:d ontknow:

I can't imagine what else it would be though. The chain angle could just be lens distortion in the camera.

[aaronatstate]

[quote=""Jeff V.""] :d ontknow:

I can't imagine what else it would be though. The chain angle could just be lens distortion in the camera.[/quote]

Yeah not sure what it could be. Agreed on the chain angle, but it still lacks a second cam, or even a spot for the cam/cam bearings. But I suppose it is possible the second cam is above the frame of the picture too...

[Chris GTO TT]

Looking back at it again it's gotta be something to do with the VVT setup.

[ChargerX3]

[quote=""Chris GTO TT""]Looking back at it again it's gotta be something to do with the VVT setup.[/quote]

[ChargerX3]

Hmm now that i think of it. Maybe that second chain is there, so you can speed up or slow down the cam movement in relation to the rotation of the motor. Yea VVT adjusts timing on the fly, but this could potentially control duration as well. Speeding up or slowing down cam movement on the fly. That would be a trick setup allowing for even more dynamic control over timing/duration/airflow.

[mjannusch]

I dunno, but it sure looks strange...

[alienviking]

It is for the flux capacitor.

[aaronatstate]

I think it may be how they are doing variable valve timing with the pushrod V8 setup. But instead of using hydraulics to do it, they are using a mechanical link. Here is the company that made the cam for the Viper with VVT. Look at the cam bearings on the "DuoCam" and in the picture of the new engine. They look nearly identical...

http://www.mechadyne-int.com/products/duocam/

[vr4]

[quote=""ChargerX3""]Hmm now that i think of it. Maybe that second chain is there, so you can speed up or slow down the cam movement in relation to the rotation of the motor. Yea VVT adjusts timing on the fly, but this could potentially control duration as well. Speeding up or slowing down cam movement on the fly. That would be a trick setup allowing for even more dynamic control over timing/duration/airflow.[/quote]

I'm pretty sure that's exactly what this is. Vvt to allow control over duration and overlap.