Hi
After waiting 3 years, I am finally doing a module at uni in something really interesting, IC engines!
I have an assignment to do on "valvetrain systems" and was wondering if any backroomers could share any knowledge or know of good references that I could have a look at?
I've already found a good report on the Rover VVT system which they published with the IMechE, however I'm struggling to find other such publications or good google links. Haynes used to be good at explaining how things functioned, but I'm not sure their new books go beyond the basics of "remove part x which varies the valve timing somehow".
Any ideas?
Thanks in advance,
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Mike Farrow
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The first book that springs to mind to give a good descriptive introduction would be Heisler, Advanced Engine Technology.
Other, more technically demanding (and mathematical!) books suitable for undergraduate use would be Heywood - Internal Combustion Enfgine Fundamentals, or a similarly titled book by Stone.
However to go further, it might be better to understand exactly what you are looking for.
What, in particular, is your assignment about? General valvetrain layouts - the aerodynamic aspects of engine gas exchange - how gas exchange dominates most aspects of engine design - the dynamics and stressing of valvetrain systems - the drive system, or the direct actuation of the valves, or even, the tribology of the cam-follower and valve-seat interfaces?
Number_Cruncher
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Firstly, thank you to all your replies so far.
The first book that springs to mind to give a good descriptive introduction would be Heisler, Advanced Engine Technology.
Good choice, I think everyone else has the same idea! All four in the library are out at the moment!
Other, more technically demanding (and mathematical!) books suitable for undergraduate use would be Heywood - Internal Combustion Enfgine Fundamentals, or a similarly titled book by Stone.
Two available in library, I'll have a look tomorrow :-)
However to go further, it might be better to understand exactly what you are looking for.
We had several topics to choose from, and thus I chose "Valvetrain systems" for which I have to talk about the type, function, technical features, design, development, manufacture, performance and application of my chosen topic. There seems to be a lot to cover, especially for 6,000 words. However, I'd like to spend a lot of that on VVT, especially since "VVT" was the first thing the lecturer said when I told him what topic I was doing :-)
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Mike Farrow
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You may find this wikipedia entry useful.
en.wikipedia.org/wiki/VVT
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Remember there are many different types of valvetrain system.
Bascially OHV, side valve and OHC. Within OHC, you have cam belt or cam chain. Then Honda VTec, Toyota VVT, BMW Vanos etc etc.
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Espada III - well if you have a family and need a Lamborghini, what else do you drive?
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Don't forget desmodromic systems, in which the valves are closed as well as opened positively by the cams, not by a spring. I think some Mercedes 300SLs had desmodromic valves. For all I know all F1 cars have them too.
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I believe some early IC engines had spring-flap inlet valves.
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I have a stationary engine (alcohol - hot bulb ignition) with a (light)spring closed/ manifold depression opening inlet valve dating from around 1900.
However the most interesting feature is the exhaust valve (slide) which has variable timing to achieve speed control from a classical centrifugal governor.
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pmh (was peter)
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Other Valve systems not already mentioned are rotary valves and the sleeve valve system as used by Daimler pre WW2. I recall my father, who worked in the motor trade pre war, relating to the near total silence of this engine on tickover, which was totally amazing. The system did not evolve into widespread acceptance because of its high maintenance requirements, but is a must to include in your uni thesis.!!!
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Sleeve valve engines were also notorious for severing the fingers of careless mechanics.
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"Don't forget desmodromic systems"
As fitted to most (if not all) Ducatis, still.
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Then there's solenoid operation, which I believe is finding it's way into racing engines? I had the idea for this some years ago, but wasn't sure how feasible it was then. Being able to control the timing completely electronically should be ideal, but I guess you'd need safe clearances just in case it lost the plot!
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finding it's way = finding its way (of course). Damn!
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Join the SAE www.sae.org/ , as a student you get cheap membership rates, and access to all sorts of excellent publications, and also European-based trade magazines for free.
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There's also the "new" system which does away with the camshaft altogether, each valve being operated by its own electrohydraulic (?) actuator.
Andy
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>>I think some Mercedes 300SLs had desmodromic valves. For all I know all F1 cars have them too.>>
F1 cars have pneumatically closed valves.
The following may be of help.
www.amesim.com/applications/automotive/valvetrain....x
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How has your assignment gone Mike?
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How has your assignment gone Mike?
Hi NC
Not bad, thanks for asking. I found both your recommended books very good and interesting (and also on the course reading list which I hadn't read, oops!).
'Valvetrain systems' as I thought turns out to be quite a broard subject and I could have easily have continued beyond the 6000 words limit myself and my partner (it was a two person mini-project) got down. There seems to be enough information out there to cover an assignment on VVT all by itself! All quite different systems used by various manufacturers.
Thanks to everyone for all the advice.
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Mike Farrow
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>>(and also on the course reading list which I hadn't read, oops!).
These were on the reading list when I was at uni 10 years ago - I don't know if there are any more modern equivalents.
Glad to hear the assignment went well!
IC engines in the 3rd year - sounds like a mech eng course?
Number_Cruncher
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IC engines in the 3rd year - sounds like a mech eng course?
you got it! :-)
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Mike Farrow
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