The pins wearing out is the only weakness in the system I think. But I ran two VVC cars, one after the other, and the VVC mechanism was always reliable for me.integrale_evo wrote: ↑Fri Mar 06, 2020 10:11 am Nope, me neither. I just thought it varied the base position relative to the valves by rotating the journals on an eccentric. Had no idea it did the speeding up and slowing down thingy.
Pretty impressive for the mid 90s and don't think I've ever heard of a vvc unit failure.
Decent car YouTubes
Re: Decent car YouTubes
The artist formerly known as _Who_
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Re: Decent car YouTubes
I was thinking about this earlier and wondered who has the vvc patent now, or whether they ever protected the design. Wonder if it was something bmw took with them.Simon wrote: ↑Fri Mar 06, 2020 11:23 amThe pins wearing out is the only weakness in the system I think. But I ran two VVC cars, one after the other, and the VVC mechanism was always reliable for me.integrale_evo wrote: ↑Fri Mar 06, 2020 10:11 am Nope, me neither. I just thought it varied the base position relative to the valves by rotating the journals on an eccentric. Had no idea it did the speeding up and slowing down thingy.
Pretty impressive for the mid 90s and don't think I've ever heard of a vvc unit failure.
The fiat multiair system is also variable duration, it just can't increase duration over what is ground into the cam, however it can reduce it, all the way to zero if you really wanted!
Cheers, Harry
Re: Decent car YouTubes
IIRC it was originally a very old (Yamaha?) design that someone had BL found and productionised in the VVC engine. I don't _think_ it was a BL/MGR patent in the first place.
The artist formerly known as _Who_
Re: Decent car YouTubes
Not watched it yet but old skool cars with Tiff.
Re: Decent car YouTubes
I always thought the VVC design (at Rover at least) was a Ricardo thing that came with the K-series, or whomever it was that consulted on the engine design. Perhaps that was just VHPDs or something?
I'm sure there's an interesting history in there somewhere, I can't see even BL being so blind as to design a bonkers-advanced VVT system and not patent it for all the moneyz, etc.
Re: Decent car YouTubes
Here you goBeany wrote: ↑Mon Mar 09, 2020 11:12 amI always thought the VVC design (at Rover at least) was a Ricardo thing that came with the K-series, or whomever it was that consulted on the engine design. Perhaps that was just VHPDs or something?
I'm sure there's an interesting history in there somewhere, I can't see even BL being so blind as to design a bonkers-advanced VVT system and not patent it for all the moneyz, etc.
The artist formerly known as _Who_
Re: Decent car YouTubes
This is quite a good channel for all things JDM.
https://www.youtube.com/channel/UCrVw06 ... 5SnB2q5PHA
https://www.youtube.com/channel/UCrVw06 ... 5SnB2q5PHA
Re: Decent car YouTubes
Quite interesting
Re: Decent car YouTubes
I'm rewatching the build for MCM's Supergramps now that they've decided it's finished. It's a great series, interesting to see what goes into working on a flat engine as I've never worked on one before.
An absolute unit
Re: Decent car YouTubes
Slow start but persevere with this one, the levels this man works at are an example to us all:
Re: Decent car YouTubes
I “speed-watched” that earlier, and even then it was mind-bending. Amazing skills and a simply ridiculous focus on details. Fantastic he can make that work as a business
Re: Decent car YouTubes
[mention]scotta[/mention] at the last ScottishElises meet-up.