I thought the title would get Roberts attention.
Anyway the HRX finshed up my wishlist I started last year. I got my Echo trimmer/edger/blower and now the Honda. That should make a nice kit for around my house.:thumbsup:
I thought the title would get Roberts attention.
No that did not happen. Anyway picked up a HRX217VKA today. I drove to a HD alittle further away (15 miles) to ket the K4 model. Didnt want to chance an old K3 that HD had sitting around that may have carb issues. I filled out warranty online and should have gotten the 6 year. Plus a bonus HD had going on with 2 ATL Braves tickets for the first 5500 people who mail in a receipt ($100 or more) and rebate form. That was sponsored by Scotts and HD. I got my 10%off military discount. It would be great to get the Braves tickets as a bonus.
I unpacked the mower set it all up and it fired up in one pull. Very nice. When I was checking the oil I was wondering if I am supposed to screw in the dip stick or just dip it. No mention in the manual but there was a trusty dummy sticker there to help me out. I have seen it recommended both ways. Only bad news is my lawn does not need to be cut. I sure hope the extra torque 8.4 vs my old 6.75 will handle my thick Bermuda grass. I think I will get along fine with the smart drive. It feels really solid. I will post more when I actually get to use it.
Quietening costs power in 2017 just the same way as it did in 1917 technology can not override physics.
So the only alternative is to fit a bigger engine with a better muffler to get exactly the same power to the blades as the older noisy engine.
The net result is use use more fuel to do exactly the same mowing.
Up to you what is more important.
Victa made a quiet mower back in 1986
It was called the Vortex.
The USA government banned it because being so quiet they deemed it to dangerious for use by the general public.
In order to sell it they had to fit a flashing light, dead mans ignition cut out and cut out on the rear flap.
Down here Hondas are of the quieter mowers but they run at 3200 to get there not 3600 as most of yours do.
When the research for the vortex was being done the CSIRO found the actual blades were making most of the noise, not the engine.
It is just the engine noise is a higher pitch that we hear really well and the blades were a lower pitch but had a lot more energy.
Noise is energy.
Down here mowers are limited to 75 Dba.
Noise from exhausts happens because it is at a higher pressure and higher temperature than the surrounding air.
To reduce the noise you have to both slow the gasses and to cool them down as well as breaking up the pressure pulses.
You can make your mower dead quiet but the double walled stainless steel 4' long muffler will cost about 1/2 what you paid for the mower again an be a little awkward in use.
No that did not happen. Anyway picked up a HRX217VKA today. I drove to a HD alittle further away (15 miles) to ket the K4 model. Didnt want to chance an old K3 that HD had sitting around that may have carb issues. I filled out warranty online and should have gotten the 6 year. Plus a bonus HD had going on with 2 ATL Braves tickets for the first 5500 people who mail in a receipt ($100 or more) and rebate form. That was sponsored by Scotts and HD. I got my 10%off military discount. It would be great to get the Braves tickets as a bonus.
I unpacked the mower set it all up and it fired up in one pull. Very nice. When I was checking the oil I was wondering if I am supposed to screw in the dip stick or just dip it. No mention in the manual but there was a trusty dummy sticker there to help me out. I have seen it recomended both ways. Only bad news is my lawn does not need to be cut. I sure hope the extra torque 8.4 vs my old 6.75 will handle my thick Bermuda grass. I think I will get along fine with the smart drive. It feels really solid. I will post more when I actually get to use it.
Incredible historic perspective (particularly on the Victa "Vortex") !
If we had the same "limited to 75-dba" mandate, I would not be bringing up the issue. It's the 90-95 db.+ levels at very ear-sensitive and damaging levels that is very concerning --particularly with prolonged exposure. The engine and exhaust noise is by far the most concerning.
The sound from blades spinning (at any speed) would be at a frequency (spectra) benign to our hearing. It would be/is far too low in frequency to be of concern. I must say, the "Vortex" example you provided is most bizarre; are battery operated mowers also dangerous/hazardous as a result of their 60-70-db. noise (humming) levels ? I've yet to see a strobe light version, but of course this isn't 1986.
The (combustion) engine/exhaust frequency spectra at 90-100 db. levels (at operator distances) is very concerning.
There is no reason why a simple "hat" cannot be fitted to reduce noise levels by 10-20 db., while simultaneously designed for the required air flow. This user-installed/removable "hat" (engine cover) could be both economical, practical and safe.
In any event, for anyone using powered equipment for extended periods of time, ear-plugs are highly advisable.
If not practical or in itself too dangerous, other methods must be employed to ensure those 75-dba. noise levels (that are indeed quite commendable) are maintained.
peter jasz
Incredible historic perspective (particularly on the Victa "Vortex") !
If we had the same "limited to 75-dba" mandate, I would not be bringing up the issue. It's the 90-95 db.+ levels at very ear-sensitive and damaging levels that is very concerning --particularly with prolonged exposure. The engine and exhaust noise is by far the most concerning.
The sound from blades spinning (at any speed) would be at a frequency (spectra) benign to our hearing. It would be/is far too low in frequency to be of concern. I must say, the "Vortex" example you provided is most bizarre; are battery operated mowers also dangerous/hazardous as a result of their 60-70-db. noise (humming) levels ? I've yet to see a strobe light version, but of course this isn't 1986.
The (combustion) engine/exhaust frequency spectra at 90-100 db. levels (at operator distances) is very concerning.
There is no reason why a simple "hat" cannot be fitted to reduce noise levels by 10-20 db., while simultaneously designed for the required air flow. This user-installed/removable "hat" (engine cover) could be both economical, practical and safe.
In any event, for anyone using powered equipment for extended periods of time, ear-plugs are highly advisable.
If not practical or in itself too dangerous, other methods must be employed to ensure those 75-dba. noise levels (that are indeed quite commendable) are maintained.
peter jasz
"recently bought" = warranty issue
Interesting discussion re: sound levels and sound quality.
I always thought if "they" would only put a little bigger muffler on ... guess it's not so simple. That said, it's a wonder that any 1-cyl engine doesn't just rattle itself to death.
Re: bigger engine, quieter engine
Yep, and my father-in-law's zero turn is noticeably quieter than any push mower I've heard.