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Re: Honda Power Unit
Posted: 21 Feb 2018, 01:01
by godlameroso
PlatinumZealot wrote: ↑20 Feb 2018, 23:49
It is probably safer to control swirl by making one intake valve slightly smaller, because I am thinking that making one intake valve open slightly quicker than the other one can lead to problems on the exhaust stroke? Not to mention torsional vibrations on the camshaft. What do you think?
I think there was an VW engine that adjusted valve lift on one of the intake valves only, but I can't quite remember if both valves still closed at the same time despite that.
The valves would still close well before TDC on the compression stroke. The camshafts don't touch the valves directly, as long as there's some clearance between the rocker and valve stem any harmonics would/should be taken up by a lost motion assembly. Still I imagine you're right, that doesn't mean that they can't do both, different sized valves different lift profiles. The difference doesn't even have to be large, a few tenths of a mm difference can have big changes.
Re: Honda Power Unit
Posted: 21 Feb 2018, 11:33
by seezung
Re: Honda Power Unit
Posted: 21 Feb 2018, 11:35
by bonjon1979
Sounds like a bag o nails again...
Re: Honda Power Unit
Posted: 21 Feb 2018, 11:40
by GhostF1
bonjon1979 wrote: ↑21 Feb 2018, 11:35
Sounds like a bag o nails again...
Idle sound means nothing. Honda runs the car on half cylinders in the pits before firing all 6 at exit. We don't know why they run it as such, whether it be a trick firing order or layout or just something to hide audible details from opponents. It's all speculative and has been discussed in length in this thread over the last 12-18 months.
It sounds different however, but I wouldn't mind hearing it at full chat. Here's hoping there's another tweet soon.
Re: Honda Power Unit
Posted: 21 Feb 2018, 11:45
by Squid
bonjon1979 wrote: ↑21 Feb 2018, 11:35
Sounds like a bag o nails again...
It sounds perfectly normal. If you doubt it, listen to the new Ferrari engine on the Sauber:
[media]
https://twitter.com/SauberF1Team/status ... 0897180672[/media]
Re: Honda Power Unit
Posted: 21 Feb 2018, 12:04
by Vladimir
Sounds powerfull.
Re: Honda Power Unit
Posted: 21 Feb 2018, 14:20
by f1rules
Re: Honda Power Unit
Posted: 21 Feb 2018, 14:25
by etusch
They tend to hide car until launch
Re: Honda Power Unit
Posted: 21 Feb 2018, 14:26
by nzjrs
Wow! that feathering of the throttle/power through gearshifts sounds quite distinctive
Re: Honda Power Unit
Posted: 21 Feb 2018, 14:33
by Morteza
Re: Honda Power Unit
Posted: 21 Feb 2018, 15:49
by bonjon1979
GhostF1 wrote: ↑21 Feb 2018, 11:40
bonjon1979 wrote: ↑21 Feb 2018, 11:35
Sounds like a bag o nails again...
Idle sound means nothing. Honda runs the car on half cylinders in the pits before firing all 6 at exit. We don't know why they run it as such, whether it be a trick firing order or layout or just something to hide audible details from opponents. It's all speculative and has been discussed in length in this thread over the last 12-18 months.
It sounds different however, but I wouldn't mind hearing it at full chat. Here's hoping there's another tweet soon.
Ah, thanks for that, I thought I could hear something that was different to the others. Doesn't sound too shabby while running. Also IT"S RUNNING!!!! Fingers crossed for them.
Re: Honda Power Unit
Posted: 21 Feb 2018, 15:53
by bonjon1979
Is it me or is there a weird sound on upshift? Is it a vibration?
Re: Honda Power Unit
Posted: 21 Feb 2018, 15:56
by bonjon1979
bonjon1979 wrote: ↑21 Feb 2018, 15:53
Is it me or is there a weird sound on upshift? Is it a vibration?
The mercedes upshift, is just totally clean but if you listen to the Honda, there's a kind of stuttering of the revs at each upshift. What do people make of that?
https://www.youtube.com/watch?v=4mtjC9DozXs
Re: Honda Power Unit
Posted: 21 Feb 2018, 16:12
by restless
1y ago in Australia there were severe upshifting problems with the engine&transmission
Re: Honda Power Unit
Posted: 21 Feb 2018, 16:23
by bonjon1979
restless wrote: ↑21 Feb 2018, 16:12
1y ago in Australia there were severe upshifting problems with the engine&transmission
Is that what we're hearing in that video?