Engines,,,General Information....

M

MotoMel

Registered
4.6 liter engines displace 4600 cc's. 1 liter is 1000 cc's or 61 cubic inches, therefore 61 x 4.6 = 280.6 or 281 cubic inches.

In our case it's not the internal size of the engine that is so important but the advances in engineering in the field of cam design, electronics of engine management and fuel injection.

When I was a kid these things were very expensive and complicated add ons for racing only and now they are just run of the mill standard engine equipment.

We can thank the engineers at Ford for a great deal of the magic behind the DOHC engine that they developed for Indy and the GT-40 projects in the '60s, General Motors (1957 Corvette) and Bosch (1957/58 American Motors Rebel and mercedes) for streetable fuel injection and the Japanese motorcycle industry for multi cam, multi valve design advances. I think it was in 1961 or 62 when Honda won many races with 6 cylinder 125 cc and 250 cc twin cam 4 valve engines.

MotoMel
 
RE: Engines,,,General Information....

Hey I got a question, GM has the 4.6 DOHC Northstar. It is the same displacement and about the same HP and Torque as our 4.6 DOHC. It also debuted around the same time (1993 in the Cadillac Allante. Who did the copying there?
 
RE: Engines,,,General Information....

Hey I got a question, GM has the 4.6 DOHC Northstar. It is the same displacement and about the same HP and Torque as our 4.6 DOHC. It also debuted around the same time (1993 in the Cadillac Allante. Who did the copying there?
Click to expand...

GM has been playing around with 4 cam 4 valve engines for many years. In the early '70s I was in Smokey Yunik's shop in Daytona and he was deep into building some prototype heads for Buick.

Ford was the first to build a proven performer DOHC for their Indy program. As for who copied who I don't know, but with corporate espionage and the rumors that fly around in the auto industry I feel certain that they both rushed to get the jump on each other. Sandy may have some inpiut here. SANDY......

MotoMel
 
RE: Engines,,,General Information....

Thank Moto! That helps a lot.. I hate math ;)


Chad
Owner of a 1993 Deep Jewel Green with Mocha interior Mark VIII
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RE: Engines,,,General Information....

SANDY? The same guy who thinks the new interior of the 2006 GS looks like a 1975 Imperial? :)
 
RE: Engines,,,General Information....

They have been making dohc engine at least from the twenty's. I know Harleys had a four valve head, can not remember if it was dohc. Look at Speedy Bills collection of Speedway motors. They were not common and very expensive for sure. If I rememder correctly didn't the Chevrolete brothers get kicked out of their own company and then went to work building dohc heads for the Ford 4 cylinders.
 
RE: Engines,,,General Information....

I've seen hondas with SOHC 4 valve-per-cylinder heads.
 
RE: Engines,,,General Information....


They have been making dohc engine at least from the twenty's. I know Harleys had a four valve head, can not remember if it was dohc. Look at Speedy Bills collection of Speedway motors. They were not common and very expensive for sure. If I rememder correctly didn't the Chevrolete brothers get kicked out of their own company and then went to work building dohc heads for the Ford 4 cylinders.
[/quote]
harley's are a push rod 2 valve engine except for the v rod Hey what about the 427 cammer that ford developed ?? was it 66 or 67?
 
RE: Engines,,,General Information....

They have been making dohc engine at least from the twenty's. I know Harleys had a four valve head, can not remember if it was dohc.
Click to expand...

The Revolution motor in the V-rod is Harley's first four valve per cylinder motor. It's also their first DOHC motor. All their other motors have the cam (2 in the Twin Cam 88/88b) in the crank case.

I've only seen one of the old Ford Cammers, years ago. I think it was a SOHC, but I can't remember for sure.

My second wife had a mid/late 80's Toyota Supra with a DOHC straight six. Good mtor, tons of torque.
 
RE: Engines,,,General Information....

Heres a caption from a Harley web page. 1916

Technically, those first pocket-valve engines were superceded in 1916, when the factory developed highly advanced eight-valve motors, with four overhead valves per cylinder, just like most modern Superbikes. But in actuality, the earlier bikes continued to run as a backup to the eight-valves, which had early reliability issues.

And heres a web page addres to a couple dohc engines that were built in 1919. http://www.milleroffy.com/Junior Specials.htm
Take a look, It is pretty cool!
 
RE: Engines,,,General Information....

Jaguar has had DOHC engines since the 40's.

Quoted from a [link:www.worlduph.com/JAGHISTORY.htm|Jaguar History Website]

"During WW2, Lyons and Heynes, with Walter Hassan and Claude Bailey, planned a new engine that would establish the company as a world force. They chose an advanced overhead camshaft layout for their straight six engine, which initially produced 160bhp. To publicise it they decided to build a limited run of sports cars, and Lyons had just a couple of months to design a body before the 1948 London Motor Show.

The car - the XK120 - stole the show, and was destined to become one of the great sports cars. Its designation was based on it's top speed, and to convince sceptics a standard XK120 clocked 126mph in a press demonstration. It was the fastest production car in the world."

http://members.tccoa.com/lastmrk/Images/lastmrk2.jpg
 
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