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2008 Sienna Hybrid - Do you want 4 cylinders or 6?

44 messages,  Last post on Jun 17, 2008 at 5:30 AM

You are in the Toyota Sienna Forum.

What is this discussion about? Toyota Sienna, Hybrid Cars, Van

Messages Page 5 of 5

#35 of 44 Re: I vote for the I4 hybrid but with a SuperCharger. [timothyh] by ateixeira

Apr 25, 2008 (7:10 pm)

Replying to: timothyh (Apr 24, 2008 10:40 am)
CAFE uses unadjusted EPA fuel economy numbers.
 
They've been lowered twice, yet CAFE still uses the very outdated higher numbers from the 1980s.
 
The Sienna would probably get 23-24mpg on that old scale.

#36 of 44 Please; NO 4 cylinder engine for the Sienna by basenjiboy

Apr 26, 2008 (5:50 am)

Replying to: timothyh (Apr 25, 2008 12:44 pm)
V-6's are rough enough, especially in 90 degree configuration and without counterbalancers. Coming from my last three cars with rotary, inline 6, and V-8 motors, the current Sienna motor doesn't feel particularly smooth to me. The last thing I'd want is a large unbalanced inline 4 booming away under the hood. Inline fours are not in primary balance, nor are 90 V-6's. The only way to get them to be truly smooth is use counterbalancers, which add weight and mechanical complexity. At least a decent V-6 is smoother than an inline 4.

#37 of 44 Re: Please; NO 4 cylinder engine for the Sienna [basenjiboy] by wwest

Apr 26, 2008 (8:28 am)

Replying to: basenjiboy (Apr 26, 2008 5:50 am)
"The only way to get them to be truly smooth...."
 
Yes, that's likely very true for I4/inline, but what about "boxer" style..??
 
Wouldn't those be even more "perfectly" balanced vs any "V" engine..??

#38 of 44 Re: Please; NO 4 cylinder engine for the Sienna [basenjiboy] by jim314

Apr 26, 2008 (8:30 am)

Replying to: basenjiboy (Apr 26, 2008 5:50 am)
There is negligible additional complexity in having twin counter rotating balance shafts to smooth out an inline 4-cyl. I know Chrysler used them on its now superceded 2.5L 4-cyl. I suppose that the European mfgrs use them on their 2.0 L 4-cylinder engines.

#39 of 44 Re: Please; NO 4 cylinder engine for the Sienna [basenjiboy] by ateixeira

Apr 26, 2008 (6:44 pm)

Replying to: basenjiboy (Apr 26, 2008 5:50 am)
The chain-driven 2GR V6 isn't exactly known for being quiet. The 3MZ was actually more quiet.
 
It's worth the trade-off for all the extra horsepower, but still.
 
FWIW Toyota added sound insulation to the fire wall and along the door sills to offset the extra noise from the V6.
 
Hybrids often shave weight by removing sound deadening, though.

#40 of 44 Paging wwest, paging wwest... by ateixeira

May 12, 2008 (10:56 am)

People are asking for an AWD descrition in this thread:
 
http://townhall-talk.edmunds.com/direct/view/.eea4ead/1223
 
Can you please hop over there?

#41 of 44 Re: Paging wwest, paging wwest... [ateixeira] by wwest

May 13, 2008 (9:54 am)

Replying to: ateixeira (May 12, 2008 10:56 am)
Done.

#42 of 44 New Japan-only Toyota mini van drops hybrid by timothyh

May 19, 2008 (12:05 pm)

Toyota introduced an updated version of its Japan-only minivan, the Alphard, last week. The Alphard did have a hybrid version from 2004-08. The 2009 drops the hybrid version. Toyota is introducing a V-4 and a V-6 version of the Alphard in Japan. The V-4 is said to get 27mpg. Does anyone know whether that's highway or combined?
 
Does any one know if this means no hybrid system for the Sienna?

#43 of 44 Future Sienna by surjn98

Jun 17, 2008 (5:22 am)

When does the next generation Sienna come out? Just curious!!

#44 of 44 Re: Future Sienna [surjn98] by timothyh

Jun 17, 2008 (5:30 am)

Replying to: surjn98 (Jun 17, 2008 5:22 am)
The speculation is 2010.

Messages Page 5 of 5

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