The October HotRod mag has a 67 Chevelle giveway car called PowerDriver. The car was built by GM employees Scott Leon, Dennis Skutecki, Chris Stubbs and Wayne Brooke at the Mesa Arizona GM proving grounds. The car is powered by a GMPP 405 hp Gen III LS6 crate engine and backed by a new for 03, 4l65E automatic overdrive crate transmission.

I suggest that the 03 4L65E is the transmission that will be the starting transmission in the C6. It has already been upgraded for that kind of power and was tested in several versions in the Tiger Shark, White Shark and the Chevy SS and who knows where else. Hill has said that there will be some features added. Probably shift control.

Another article titled the Bionic Transmission from the Nov Super Chevy has Jim La Fontaine from GM Performance Division stating, "The L65 is suited to small block engines, it's designed to fit within the drivetrain of a small block powered vehicle. . ." The article is well worth reading in that the mechanical differences in the 4L65E are detailed as well as the electronic controls.

GM may renumber it somewhat to distinguish it Vette only but that's the transmission.

From Chevy High Performance for Nov comes an interesting article on a 383ci stroker engine that has minimal boring of .030 to 3.9041, and a four inch stroke. Naturally it's a beautifully hand assembled engine with premium parts but it is a street engine that puts out 545.6 hp @ 5800 rpm and 533.8 lb ft @ 4700 rpm.

If we go back to the Oct 01 Hot Hot reported engine by GM PowerTrain, with a considerablely bigger bore and a 3.7 inch stroke for 6.4lt, it's easy to see that even a 2 valve engine can produce the required 500hp for the C6 Z06. With 3 valves it's no sweat. The shape of the torque curve will respond somewhat to cam phasing but that again is GM's choice. Keep the current bore and use the same 3.7 inch stroke and you have 6lt for the "standard" engine. Number of valves in this engine, unknown.:cool:


[Modified by I Bin Therbefor, 9:22 PM 9/20/2003]

 

I Bin do you know anything about the latest camless engine use by Power boat racers, my friend is a owner navigator, said something about "popit valves" --any clue?

 

Not specifically.
Popit valves are another name for check valves whose purpose in life is to limit the flow of a gas or fluid to one direction in a pipe. They sometimes look like a hinged flap, or a ball in a cage, etc. . When the gas or fluid reverses direction the value is forced closed, when the fluid goes the other way, the valve is forced open. Both by the flow of the gas. Usually used with two cycle engines although I've seen them tried on the exhausr side of a four cycle to keep the exhaust from back filling into the cylinder. It was supposed to enable the vacumm in the cylinder to draw strictly from the intake side.

There are a multitude of problems with materials, speed of reaction to the change of flow, sealing and a bunch of other stuff. But they have been used successfully in two cycle engines where the only control over the flow of gas is the piston covering and uncovering the ports cut into the cylinder. So if you buddies are running two cycle outboards that's where the popit valvres are likely to be, on the exhaust side of the engine. The other place is on the intaike side but that's another story. Oh, the action of the valves themselves can cause standing waves from opening and closing and that too needs to be figured in. Maybe Duke will chime in with his observations.

In a funny way, tuned exhaust headers can be looked on as aerodynamic popit valves because among other things they try to time the standing wave created in the exhaust system in such a way as to have a vacumm appear at the time a exhaust valve is opened. Not only reduce the back flow but help pull in the new charge. There is a header manufacturere who builds headers with a stub exhaust passage sized pipe enclosed inside a larger pipe. The idea is to destroy the overpressure exhaust wave traveling back into the cylinder!

If you've got a brand name on the engine, I'd like to follow up. You've got my interest now.:cool:


[Modified by I Bin Therbefor, 1:54 AM 9/21/2003]

 

Sure I'll let you know, sometimes he is hard to find-- :lol: I don't have his phone number and I only see him at the gym. I saw him today and had a brief chat with him to ask about camless engines, however, he got busy on the phone so I couldn't ask him more questions. As far as I know someone has a patent on this engine, but the name of the company escapes me for now. He hasn't been racing for awhile--since his boat did a flip at a race and he was rescued in time! But that really scared him!

 

Been reading the Lotus Active Valve Train stuff only to discover that to an English person a poppit valve is nothing more than our ordinary garden variety valve in our four cycle engines. Vettes have 16 poppit valves in an ohv configuration. Now I am confused. Is your friend English by any chance? :confused:

 

It's POPPET valve - what's in your Corvette engine and every other current four-stroke reciprocating gasoline engine and both two and four stroke diesels. They've been around since the dawn of the IC engine and no one has ever come up with a better valve system, but many have tried.

Ever heard of sleeve valves? I've discussed them before - prewar English Riley cars, the Napier Sabre H-16 aero engine and a couple of Bristol radials. They failed to achieve their initial promise and hype. Same with the Coates rotary valve system. No one's interested!

Duke

 

The 4L65E is only rated to 380 ft./lbs. of torque. If they upgraded it beyond that, they'd probably call is something else (like 4L70E or something.)

 

http://www.superchevy-web.com/tech/0311sc_4l65e/
http://www.gm.com/automotive/gmpower.../apps/4l60.htm
http://media.gm.com/division/powertr...specs.html#m30

Here it is behind the LS2??
http://www.maximum-cars.com/Cars/Car.php?carnumber=416


[Modified by Runge_Kutta, 4:47 PM 9/22/2003]

 

Thanks Duke. I got my valves mixed!

There's a guy around here that has an old tractor with sleeve valves, I can't remember the brand. :cool:

 

How about that. There it sits behind a 430 X 430 engine. Wonder if it's "stock" or further upgraded. :cool: