VVT/VVL for pushrod engines.

Just putting it down, because pushrod engines with VVT do actually exist. It'd be nice if we could do this in Automation as well.

Examples:

GM's LZ4 and LZE V6's
Chrysler/Dodge Viper V10 (2nd-gen and on)


GM also experimented with pushrod engines that had two cams in the block for multivalve/VVT purposes.

[Daffyflyer]

VVT probably should be available yeah, although as its a bit of a bitch to implement on an OHV engine it might require a bit of extra research.


VVL on the other hand, unless someone can show me a cam profile switching setup for an OHV engine, I don't believe its practical

It's not quite the same, but it's still about VVT/VVL :
Didn't you say there was a problem with 5 valves/cylinder ? How is it coming ?

VVL on the other hand, unless someone can show me a cam profile switching setup for an OHV engine, I don't believe its practical

Delphi developed a 2 step OHV valve lift system a few years ago. They had a pretty good technical description on their website but it doesn't seem to be working now, I don't know if they went bankrupt or what. It looked fairly production-ready to my untrained eye, but I can't remember the exact details of how it worked.

Viper has a pushrod engine?! American cars are such garbage.

have you looked at the horsepower and torque numbers for it ........ read all the facts before you judge dude

Viper has a pushrod engine?! American cars are such garbage.

HUH? Pushrod doesn't equal crap. It has its place. Look at the GM LS series of engines who have great power. Hell they are even smaller and lighter than OHC engines, thats why GM went with them instead of OHC. Compare early LS motors VS early Ford OHC Modular V-8s untill recently the OHC was down on HP.

I love my pushrod Ford Windsor V-8 motors.

i love my pushrod LA 318

[Daffyflyer]

Pushrod has issues, its really hard to run more than 2 valves with it, so valve area is limited, and the extra valve train mass makes it A: difficult to rev hard without breaking something and B: waste a lot of power opening the heavy valve springs needed to control all that valvetrain mass.


Where it does have an advantage is size though, OHV motors are a lot smaller - This is a good example http://www.honda-perf.net/images/tech/5 ... arison.jpg

have you looked at the horsepower and torque numbers for it ........ read all the facts before you judge dude

Yes, because 640bhp from 8400cc is awesome