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 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 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.
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.
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!
Re: Decent car YouTubes
Posted: Sun Mar 08, 2020 6:36 pm
by Simon
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.
Re: Decent car YouTubes
Posted: Sun Mar 08, 2020 8:28 pm
by Coaster1
Not watched it yet but old skool cars with Tiff.
Re: Decent car YouTubes
Posted: Mon Mar 09, 2020 11:12 am
by Beany
Simon wrote: Sun Mar 08, 2020 6:36 pm
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.
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.
Simon wrote: Sun Mar 08, 2020 6:36 pm
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.
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.
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.
Slow start but persevere with this one, the levels this man works at are an example to us all:
Re: Decent car YouTubes
Posted: Tue Mar 17, 2020 10:26 pm
by jamcg
Re: Decent car YouTubes
Posted: Tue Mar 17, 2020 11:07 pm
by tim
Barry wrote: Tue Mar 17, 2020 9:46 pm
Slow start but persevere with this one, the levels this man works at are an example to us all:
OBJAY DAR MATE!! I *loved* this video, purely for the bloke.
Re: Decent car YouTubes
Posted: Tue Mar 17, 2020 11:13 pm
by mik
Barry wrote: Tue Mar 17, 2020 9:46 pm
Slow start but persevere with this one, the levels this man works at are an example to us all:
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
Posted: Wed Mar 18, 2020 12:00 am
by nuttinnew
Re: Decent car YouTubes
Posted: Fri Mar 20, 2020 10:36 am
by mik
[mention]scotta[/mention] at the last ScottishElises meet-up.
Re: Decent car YouTubes
Posted: Fri Mar 20, 2020 11:10 am
by scotta
mik wrote: Fri Mar 20, 2020 10:36 am
@scotta at the last ScottishElises meet-up.
