Honda Power Unit

All that has to do with the power train, gearbox, clutch, fuels and lubricants, etc. Generally the mechanical side of Formula One.
trinidefender
258
Joined: Fri Apr 19, 2013 7:37 pm

Re: Honda Power Unit

Post by trinidefender » Thu May 17, 2018 7:31 am

gruntguru wrote:
Thu May 17, 2018 1:56 am
dren wrote:
Wed May 16, 2018 12:02 pm
Yes, that is an interesting idea on the compressor. It'd have to be purely passive, right?
Need to run galleries (green) through the compressor impeller and connect to the compressor discharge. All internal to the compressor design so should be considered "passive".
https://i.imgur.com/7JnZavw.jpg
Any educated guesses on efficiency loss by doing this?

Surely the holes in the blades and the fact that some of the air is being compressed more than once as it gets recycled through the compressor will heat it up more.

I have to wonder if this will work better than simply having variable stator vanes pre compressor as are used in many gas turbines already. That would also move the surge line to the left.

IRC I had asked about this before and was told that variable geometry was allowed only banned on the exhaust side not the intake side.

So why not variable stator vanes?

roon
210
Joined: Sat Dec 17, 2016 6:04 pm

Re: Honda Power Unit

Post by roon » Thu May 17, 2018 9:30 am

trinidefender wrote:
Thu May 17, 2018 7:31 am
...why not variable stator vanes?
The Merc unit has this, maybe since inception. The '17 Honda seemed to have had it as well.

Mercedes:
Image

Honda:
Image

gruntguru
355
Joined: Sat Feb 21, 2009 6:43 am

Re: Honda Power Unit

Post by gruntguru » Fri May 18, 2018 12:18 am

trinidefender wrote:
Thu May 17, 2018 7:31 am
gruntguru wrote:
Thu May 17, 2018 1:56 am
dren wrote:
Wed May 16, 2018 12:02 pm
Yes, that is an interesting idea on the compressor. It'd have to be purely passive, right?
Need to run galleries (green) through the compressor impeller and connect to the compressor discharge. All internal to the compressor design so should be considered "passive".
https://i.imgur.com/7JnZavw.jpg
Any educated guesses on efficiency loss by doing this?
Surely the holes in the blades and the fact that some of the air is being compressed more than once as it gets recycled through the compressor will heat it up more.
I have to wonder if this will work better than simply having variable stator vanes pre compressor as are used in many gas turbines already. That would also move the surge line to the left.
IRC I had asked about this before and was told that variable geometry was allowed only banned on the exhaust side not the intake side.
So why not variable stator vanes?
Indeed. That fact that VSV are in use would reduce the potential for gains from microjets. Add to that the compromises in impeller design and possible efficiency reduction. I say "possible" because the factors (heating etc) you raise, are minor. These are tiny holes and flow is equally insignificant. OTOH any reduction in flow separation will improve efficiency although - again - the VSV system should minimise that anyway.
je suis charlie

flexcon
3
Joined: Wed Mar 08, 2017 8:18 am

Re: Honda Power Unit

Post by flexcon » Tue May 22, 2018 4:32 pm

So I found this video I put together from testing. Forgot to share and post.

Honda engine sound from multiple angles- Pure Sound only. Enjoy :)


urbanglowcam
0
User avatar
Joined: Mon Oct 31, 2011 8:05 pm

Re: Honda Power Unit

Post by urbanglowcam » Wed May 23, 2018 5:26 am

flexcon wrote:
Tue May 22, 2018 4:32 pm
So I found this video I put together from testing. Forgot to share and post.

Honda engine sound from multiple angles- Pure Sound only. Enjoy :)

https://youtu.be/u3qEZrUJpus
Hah! I thought there was an engine failure at the end before I realized it was in slow-mo. #-o

Thanks for the footage. Was it easier to distinguish the noise from the STR Honda from the others in person?

flexcon
3
Joined: Wed Mar 08, 2017 8:18 am

Re: Honda Power Unit

Post by flexcon » Wed May 23, 2018 9:36 am

urbanglowcam wrote:
Wed May 23, 2018 5:26 am
flexcon wrote:
Tue May 22, 2018 4:32 pm
So I found this video I put together from testing. Forgot to share and post.

Honda engine sound from multiple angles- Pure Sound only. Enjoy :)

https://youtu.be/u3qEZrUJpus
Hah! I thought there was an engine failure at the end before I realized it was in slow-mo. #-o

Thanks for the footage. Was it easier to distinguish the noise from the STR Honda from the others in person?
haha. I used slow Mo as the Honda engine sounds strange compared to the others in Slo-Mo. Just found that interesting, could be nothing though.

100%. Sometimes it sounded quite clean, but once there was the split second longer off the throttle, it just started giving out.
quite funny actually, at the track, whenever it passed by into a slow corner, everyone had the fingers crossed hoping whoever was driving to keep it off throttle a little longer in the corner to get that mean ass sound. It actually became an event with people shouting YAY!!! each time we got a good one. Almost like fireworks, some good ones come and go, but suddenly you get the big Bang and everyone loves it.

It didn't look slower coming out of the corner though, if anything smoother.