7M-fanatic said:
Which is completely hilarious, because overhead cam predates the pushrod overhead valve configuration by what... 30 years?
Cam layout discussion
- Thread starter Doward
- Start date
Which is completely hilarious, because overhead cam predates the pushrod overhead valve configuration by what... 30 years?
Doward said:
Bull $hit !
You sure don't know much about internal combustion engine history...
(yes, they were around before you, your fatehr, and his father were born)
Maybe you should spend a few hours at a library.
Kids..........
Jesus, I'm 24, not that old!
Look up the Oldsmobile Rocket V8 - 1949.
During the 30s, the Ford Flathead was 'it' as far as motors go - and it's not an overhead valve configuration. L-head (much like the 401 Buick) side valve configuration.
On the other hand, Fiat started using OHC in 1912. That makes OHC setups oh - 95 years old? I think we'll just call OHC the 100 year old technology
If you want to discuss this, please take it to PM - no sense in letting this topic get off it's course
Look up the Oldsmobile Rocket V8 - 1949.
During the 30s, the Ford Flathead was 'it' as far as motors go - and it's not an overhead valve configuration. L-head (much like the 401 Buick) side valve configuration.
On the other hand, Fiat started using OHC in 1912. That makes OHC setups oh - 95 years old? I think we'll just call OHC the 100 year old technology
If you want to discuss this, please take it to PM - no sense in letting this topic get off it's course
Doward said:If you want to discuss this, please take it to PM - no sense in letting this topic get off it's course
Why?
Afraid you will get flamed?
You started it..........
1902 Mercedes PRODUCTION car had a Daimler-Maybach pushrod OHV engine.
1904 JAP push rod engine.
This overhead arrangement was subsequently used in automobile and motorcycle internal combustion petrol engines. JAP became a highly successful supplier.
1910 Mercedes PRODUCTION model, 14/30 engine - pushrod, OHV, with exposed rocker arms.
Chevy's first V-8 PRODUCTION engine was released in 1917. The 90-degree overhead-valve design debuted in the D-series, exposed push-rods, rocker arms, and valve springs.
Note:
All these were PRODUCTION automobiles, not some prototype GP engine.
Libraries are such wonderfull establishements.
I've moved this as it's an interesting discussion but try and keep the emotion to a low level guys.
Some Fiat road cars (typically the sport series) from post WWI used DOHC engines. While these were not high volume in the sense of Ford, they were true production cars sold and licensed for road use.
Doward's statement that OHC predates OHC by 30 years was not correct, but both technologies did exist in the early years. Typically any technology more complex than a Model T sidevalve was relegated to expensive low volume niche cars be it Mercedes, Fiat or anyone else.
Doward's statement that OHC predates OHC by 30 years was not correct, but both technologies did exist in the early years. Typically any technology more complex than a Model T sidevalve was relegated to expensive low volume niche cars be it Mercedes, Fiat or anyone else.
Duesenberg's used DOHC engines, hence their speed
most of your really exotic cars used DOHC...
not to mention in the early days of automotives, electric cars where winning at first...
most of your really exotic cars used DOHC...
not to mention in the early days of automotives, electric cars where winning at first...
7M-fanatic said:
That's strange - the 1901 Mercedes 35hp engine that is the PREDECESSOR of the 1902 Mercedes 40hp engine, has TWO camshafts -
http://en.wikipedia.org/wiki/Mercedes_35hp
Run by 2 camshafts, gear driven from the flywheel.
If Wiki is such a horrible source, perhaps someone will be kind enough to post a cutaway of the motor in question?
I don't know about you guys, but when someone just says 'This is how it is' with nothing to back it up, I tend to not give that bit of information much credibility
So let's see some of these old school engines!
Ian, you should have a couple from your teenage years, right? :biglaugh:
I don't know about you guys, but when someone just says 'This is how it is' with nothing to back it up, I tend to not give that bit of information much credibility
So let's see some of these old school engines!
Ian, you should have a couple from your teenage years, right? :biglaugh:
OK- that is awesome. I was thinking that the future of the valvetrain would have some sort of slide-valve technology, to get rid of the up-down reciprocating mass, but roller valves? Brilliant.
Coates spherical valve system
I understand there is still a problem of sealing the chamber, though?
I understand there is still a problem of sealing the chamber, though?
There has been work on both hydraulic and electric solenoid actuated poppet valves for a long time with the aim to eliminate the cam and completely divorce valve timing from crank position.
which would allow a MUCH broader torque band, as you could program in ANY cam design, and you wouldn't be hindered by slopes, ect...
the issue is simple though, making it reliable...
the issue is simple though, making it reliable...
As I recall, Mercedes has already implemented camless actuators -
YEP!
2008 Mercedes W204 C-Class. Direct gasoline injection, electronic valve train
KDI-EVT
YEP!
2008 Mercedes W204 C-Class. Direct gasoline injection, electronic valve train
KDI-EVT