Honda Power Unit Hardware & Software

All that has to do with the power train, gearbox, clutch, fuels and lubricants, etc. Generally the mechanical side of Formula One.
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godlameroso
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Joined: 16 Jan 2010, 21:27
Location: Miami FL

Re: Honda Power Unit

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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.
Saishū kōnā

seezung
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Joined: 05 Feb 2016, 14:01

Re: Honda Power Unit

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bonjon1979
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Joined: 11 Feb 2009, 17:16

Re: Honda Power Unit

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seezung wrote:
21 Feb 2018, 11:33
We got liftoff;

https://twitter.com/ToroRosso/status/966232170867064833
Sounds like a bag o nails again...

GhostF1
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Joined: 30 Aug 2016, 04:11

Re: Honda Power Unit

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bonjon1979 wrote:
21 Feb 2018, 11:35
seezung wrote:
21 Feb 2018, 11:33
We got liftoff;

https://twitter.com/ToroRosso/status/966232170867064833
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.

Squid
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Joined: 08 Jun 2017, 00:55

Re: Honda Power Unit

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bonjon1979 wrote:
21 Feb 2018, 11:35
seezung wrote:
21 Feb 2018, 11:33
We got liftoff;

https://twitter.com/ToroRosso/status/966232170867064833
Sounds like a bag o nails again...
:roll:

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]

Vladimir
-1
Joined: 06 Nov 2016, 11:43

Re: Honda Power Unit

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Sounds powerfull.

f1rules
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Joined: 11 Jan 2004, 15:34
Location: Denmark

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etusch
131
Joined: 22 Feb 2009, 23:09
Location: Turkey

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They tend to hide car until launch

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nzjrs
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Joined: 07 Jan 2015, 11:21
Location: Redacted

Re: Honda Power Unit

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Wow! that feathering of the throttle/power through gearshifts sounds quite distinctive

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Morteza
2308
Joined: 10 Feb 2010, 18:23
Location: Bushehr, Iran

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"A fool thinks himself to be wise, but a wise man knows himself to be a fool."~William Shakespeare

bonjon1979
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Joined: 11 Feb 2009, 17:16

Re: Honda Power Unit

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GhostF1 wrote:
21 Feb 2018, 11:40
bonjon1979 wrote:
21 Feb 2018, 11:35
seezung wrote:
21 Feb 2018, 11:33
We got liftoff;

https://twitter.com/ToroRosso/status/966232170867064833
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.

bonjon1979
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Joined: 11 Feb 2009, 17:16

Re: Honda Power Unit

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Is it me or is there a weird sound on upshift? Is it a vibration?

bonjon1979
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Joined: 11 Feb 2009, 17:16

Re: Honda Power Unit

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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

restless
18
Joined: 10 May 2016, 09:12

Re: Honda Power Unit

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1y ago in Australia there were severe upshifting problems with the engine&transmission

bonjon1979
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Joined: 11 Feb 2009, 17:16

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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?

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