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Author Topic:   Yamaha Motor Announcement
kglinz posted 05-12-2003 11:24 PM ET (US)   Profile for kglinz   Send Email to kglinz  
Here's a Yamaha announcement. I wonder if Mercury will use it.
PMUCCIOLO posted 05-12-2003 11:53 PM ET (US)     Profile for PMUCCIOLO    
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.


kglinz posted 05-13-2003 12:15 AM ET (US)     Profile for kglinz  Send Email to kglinz     
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)     Profile for John from Madison CT  Send Email to John from Madison CT     
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. "


bsmotril posted 05-13-2003 09:45 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
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.
Whalerdan posted 05-13-2003 09:59 AM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
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)     Profile for bsmotril  Send Email to bsmotril     
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.
kglinz posted 05-13-2003 10:05 AM ET (US)     Profile for kglinz  Send Email to kglinz     
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)     Profile for where2  Send Email to where2     
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)     Profile for lhg    
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)     Profile for TRAFFICLAWYER    
Presumably those new blocks should render the Opti's obsolete.
bsmotril posted 05-13-2003 03:33 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
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.

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