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Author Topic:   Yamaha Motor Announcement

kglinz posted 05-12-2003 11:24 PM ET (US)
Here's a Yamaha announcement. I wonder if Mercury will use it. http://www.boating-industry.com/news.asp?mode=4&N_ID=39758
PMUCCIOLO posted 05-12-2003 11:53 PM ET (US)
I'm surprised that it took this long for Yamaha to fill it's four-stroke HP gap between the 115 and the 200. How will using four large cylinders (as opposed to the traditional V6) affect the motor's smoothness, torque, and profile? Perhaps those who have experience in this area could comment.
PM
kglinz posted 05-13-2003 12:15 AM ET (US)
I would think the Inline 4 will actually have a better torque curve than a V6 of the same displacement.
John from Madison CT posted 05-13-2003 06:55 AM ET (US)
How about this comment at the bottom of the page:
"In addition to the F150, Yamaha also revealed the Z300 and VZ300, what it calls the world's first 300-hp factory stock direct injected (HPDI) outboards. The VZ300 with its 20-inch shaft is configured for bass and flats boats. "
John
bsmotril posted 05-13-2003 09:45 AM ET (US)
Why do you think and inline 4 will out torque a V-6? I can't think of a single instance in the automotive world where with equal displacement and non-forced induction where an inline 4 has more torque than a V-6 motor. Most fours make their horsepower by spinning higher rpms and have peakier powerbands than a similar V6. You can also get better primary balance and smoother running on a V-6 with offset crank journals than is possible with an inline 4. Add a couple of balance shafts to the block though, and that's a whole new ballgame.
BillS
Whalerdan posted 05-13-2003 09:59 AM ET (US)
don't know alot about engine design, but I can tell you the Inline 6's on my Jeep's have a ton of torque.
bsmotril posted 05-13-2003 10:05 AM ET (US)
Having a power stroke every 60 degrees versus ninety degrees for a 4 banger will give you that toruque. If the new Yammie 150 is torquier, it is by virtue of its' added displacemnt and not the block configuration.
BillS
kglinz posted 05-13-2003 10:05 AM ET (US)
That opinion on torque is based on older engines. I know that a Chevy 292 inline 6 would pull a hill better than a 350 V8. I'm sure the numbers won't be published by Yamaha.
where2 posted 05-13-2003 12:30 PM ET (US)
Wow, it took those guys that long to get that little tidbit of info out of the Yamaha people? In February, I heard that they would be "filling the gap" with the first shipments hitting dealers around October.
lhg posted 05-13-2003 02:52 PM ET (US)
I think all of the newer 4-strokes in this 135-225HP range are going to be 4 cylinders.
At least that is what the rumors are with Mercury, although they might be supercharged.
They supposedly have 5 engines in this 4 cylinder line-up, 135, 150, 175, 200 & 225.
The small displacement 4 cylinder design is to keep the weight down. The in-line 6 cylinder, 2.6 liter design is for the 250-300HP range 4 strokes.
TRAFFICLAWYER posted 05-13-2003 03:20 PM ET (US)
Presumably those new blocks should render the Opti's obsolete.
bsmotril posted 05-13-2003 03:33 PM ET (US)
I don't think the Opti's will become obsolete at all. Merc will change their marketing focus and the Optis will become the performance motors for Bass, Flats, and Offshore fisherman while the four strokes will be marketed to the green crowd. It is already happening in the commercials seen during the weekly fishing shows.
BillS

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Author	Topic: Yamaha Motor Announcement
kglinz	posted 05-12-2003 11:24 PM ET (US) Here's a Yamaha announcement. I wonder if Mercury will use it. http://www.boating-industry.com/news.asp?mode=4&N_ID=39758
PMUCCIOLO	posted 05-12-2003 11:53 PM ET (US) I'm surprised that it took this long for Yamaha to fill it's four-stroke HP gap between the 115 and the 200. How will using four large cylinders (as opposed to the traditional V6) affect the motor's smoothness, torque, and profile? Perhaps those who have experience in this area could comment. PM
kglinz	posted 05-13-2003 12:15 AM ET (US) I would think the Inline 4 will actually have a better torque curve than a V6 of the same displacement.
John from Madison CT	posted 05-13-2003 06:55 AM ET (US) How about this comment at the bottom of the page: "In addition to the F150, Yamaha also revealed the Z300 and VZ300, what it calls the world's first 300-hp factory stock direct injected (HPDI) outboards. The VZ300 with its 20-inch shaft is configured for bass and flats boats. " John
bsmotril	posted 05-13-2003 09:45 AM ET (US) Why do you think and inline 4 will out torque a V-6? I can't think of a single instance in the automotive world where with equal displacement and non-forced induction where an inline 4 has more torque than a V-6 motor. Most fours make their horsepower by spinning higher rpms and have peakier powerbands than a similar V6. You can also get better primary balance and smoother running on a V-6 with offset crank journals than is possible with an inline 4. Add a couple of balance shafts to the block though, and that's a whole new ballgame. BillS
Whalerdan	posted 05-13-2003 09:59 AM ET (US) don't know alot about engine design, but I can tell you the Inline 6's on my Jeep's have a ton of torque.
bsmotril	posted 05-13-2003 10:05 AM ET (US) Having a power stroke every 60 degrees versus ninety degrees for a 4 banger will give you that toruque. If the new Yammie 150 is torquier, it is by virtue of its' added displacemnt and not the block configuration. BillS
kglinz	posted 05-13-2003 10:05 AM ET (US) That opinion on torque is based on older engines. I know that a Chevy 292 inline 6 would pull a hill better than a 350 V8. I'm sure the numbers won't be published by Yamaha.
where2	posted 05-13-2003 12:30 PM ET (US) Wow, it took those guys that long to get that little tidbit of info out of the Yamaha people? In February, I heard that they would be "filling the gap" with the first shipments hitting dealers around October.
lhg	posted 05-13-2003 02:52 PM ET (US) I think all of the newer 4-strokes in this 135-225HP range are going to be 4 cylinders. At least that is what the rumors are with Mercury, although they might be supercharged. They supposedly have 5 engines in this 4 cylinder line-up, 135, 150, 175, 200 & 225. The small displacement 4 cylinder design is to keep the weight down. The in-line 6 cylinder, 2.6 liter design is for the 250-300HP range 4 strokes.
TRAFFICLAWYER	posted 05-13-2003 03:20 PM ET (US) Presumably those new blocks should render the Opti's obsolete.
bsmotril	posted 05-13-2003 03:33 PM ET (US) I don't think the Opti's will become obsolete at all. Merc will change their marketing focus and the Optis will become the performance motors for Bass, Flats, and Offshore fisherman while the four strokes will be marketed to the green crowd. It is already happening in the commercials seen during the weekly fishing shows. BillS