Any camshaft information available?

[Murdock]

Hello guys, I was wondering if anyone knows what type of cam profile F1 uses (in general) for such high rpms. The only information i could find was they had "surprisingly little overlap considering the duration necessary to assure breathing at 17,000 rpm". I tried using a desktop dyno just to get in the ballpark but it max's out around 11K I believe.
Any information is appreciated.

[ZE.FT]

Hi Murdock,

It may be very difficult to get very fresh info about this.
Therefore ,just as a suggestion you should contact,

http://www.pipercams.co.uk or
http://www.newman-cams.com

There may be also some expert at
Quaife Engineering or Kent Cams (don't have the web addresses right now)
As other members might also be interested , pls do share the outcome of your searchs here .

Rgds

[Guest]

I would tend to believe that camshaft design and profile is one the most closely guarded secrets for any racing engine manufacturer. Especially now, since they have to keep the valves alive for two racing sessions.
Considering the RPM, the acceleration and deceleration of the valves as they open and close would be of high priority.
Here's a decent article covering the basics of cams. http://auto.howstuffworks.com/camshaft.htm

Does anyone know about the progress on electrically actuated valves? Theoretically, they would have mechanical cams beat. But obviously, in the practical world, not ready, yet.

[Murdock]

I understand the function of camshafts- I am just curious how these profiles are different for extremely high rpm engines. Any information from the last 25 years of F1 would be of high interest to me. I have "The 1000BHP Grand Prix Cars" and received the under the skin ferrari book today- but as far as I know none of this information is listed.
Thank you for the links, I will shoot some emails out and cross my fingers.

[ZE.FT]

Meanwhile check this one.
Small inside view .
http://forums.atlasf1.com/showthread.ph ... ine+photos

As you will read members are dicussing if the drawing is accurate because of the VVT.

[MS27]

Hello guys, I was wondering if anyone knows what type of cam profile F1 uses (in general) for such high rpms. The only information i could find was they had "surprisingly little overlap considering the duration necessary to assure breathing at 17,000 rpm". I tried using a desktop dyno just to get in the ballpark but it max's out around 11K I believe.
Any information is appreciated.

Hello guys!
First I want to introduce myself a little bit. I´m crazy about cars especially engines since I was a kid...Now I study mechanical engineering and i´m writing a dissertation about F1 engines at a university in Germany (sorry, if my english is bad ).
But, as you can imagine, I haven ´t found precise information about valve timing, especially duration of a Formula one engine. The only information I have is that it must be over 360 degree...
Do you have some information so far?

Thank you very much!

Regards from Germany,
Martin

[Edis]

Hello guys, I was wondering if anyone knows what type of cam profile F1 uses (in general) for such high rpms. The only information i could find was they had "surprisingly little overlap considering the duration necessary to assure breathing at 17,000 rpm". I tried using a desktop dyno just to get in the ballpark but it max's out around 11K I believe.
Any information is appreciated.

Hello guys!
First I want to introduce myself a little bit. I´m crazy about cars especially engines since I was a kid...Now I study mechanical engineering and i´m writing a dissertation about F1 engines at a university in Germany (sorry, if my english is bad ).
But, as you can imagine, I haven ´t found precise information about valve timing, especially duration of a Formula one engine. The only information I have is that it must be over 360 degree...
Do you have some information so far?

Thank you very much!

Regards from Germany,
Martin

Valve duration is rarely higher than 330 degrees (660 degrees when combining exhaust + intake duration). To get 330 degrees duration you can for instance open the inlet valve at 75 degrees before TDC and then close it 75 degrees after BDC. The duration then becomes 75+180+75 degrees = 330 degrees.

Often the duration is given at a certain lift, for instance 250 deg @ 1 mm lift. In other words, it takes 250 crankshaft degrees to get from a lift of 1 mm to peak lift and back to 1 mm lift.

SAE 2002-01-3359 'Demands on Formula One Engines and Subsequent Development Strategies' by Illien and Alten used to following assumptions for engine simulation:

B/S-Ratio : 1.95
Conrod Length : 115mm
Compression Ratio : 13.2:1
Inlet Valve Size*) : 1/3 * Bore Area
Timing @ 1mm Lift : 10º BTDC / 240º ATDC
Max. Effective Flow Area : 1525 mm2
Exhaust Valves Size*) : 1/5 * Bore Area
Timing @ 1mm Lift : 245º BTDC / 8º ATDC
Max. Effective Flow Area : 1410 mm2
*) Related to Valve Inner Seat Diameter