Posted by News on August 14, 2009, 11:38 am
> On Thu, 13 Aug 2009 08:17:00 -0400, user@domain.invalid wrote:
>>Two strokes are filthy engines.
> Not ALL 2 strokes, but any two stroke that crankcase scavenges and
> uses total loss lubrication sure is.
> A valve timed, supercharged pressure lubricated 2 stroke engine could
> be VERY efficient, and very clean with todays engine control
> electronics. Particularly with direct gasoline injection.
Sleeve valved 2-strokes are highly efficient and the most powerful engine
ever made in power/weight ratio was the RR Grecy in WW2 to replace the
Merlin. It was dropped as money was directed to jets.
Posted by harry on August 13, 2009, 6:13 pm
> > And often end up with one that ALSO needed the chain replaced. I used
> > to replace them as a precaution whenever I replaced one of the engines
> > that was prone to fail - with an aftermarket chain set that was
> > proven to outlast the OEM significantly.
> Chains stretched far more than timing belts, one of the reasons why they
> went to belts. When they stretched the timing went out. I replaced my
> timing belt and the engine was noticeable faster and smoother as the timing
> tightened up. Best to have two-stroke engines with no valves or belts. :)
> Two-stroke units are best used as range extenders on the likes of the Chevy
> Volt running at constant speed. Very smooth.
If you buy a Subaru, the timing is geared. No belts or chains. Now
that is a wonderfully smooth engine. (Boxer)
Posted by clare on August 14, 2009, 1:57 am
On Thu, 13 Aug 2009 11:13:45 -0700 (PDT), harry
>>
>>
>> > And often end up with one that ALSO needed the chain replaced. I used
>> > to replace them as a precaution whenever I replaced one of the engines
>> > that was prone to fail - with an aftermarket chain set that was
>> > proven to outlast the OEM significantly.
>>
>> Chains stretched far more than timing belts, one of the reasons why they
>> went to belts. When they stretched the timing went out. I replaced my
>> timing belt and the engine was noticeable faster and smoother as the timing
>> tightened up. Best to have two-stroke engines with no valves or belts. :)
>> Two-stroke units are best used as range extenders on the likes of the Chevy
>> Volt running at constant speed. Very smooth.
>If you buy a Subaru, the timing is geared. No belts or chains. Now
>that is a wonderfully smooth engine. (Boxer)
If you are talking the EA series you are correct. Howvever all the
overhead cam engines (I believe ALL currently produced or reasonably
recent Sbes fall into this category) are belt driven. Might be an odd
chain driven one but I've not seen it.
The EA series has been gone since something like 1989 (the 1800 GL or
"Cjhaser" EA81)
Even the EA82 was belt driven (starting something like 1985)
Posted by Neo on August 13, 2009, 8:26 am
wrote:
> > Years ago, looking into the cost of a battery change in a Prius only
> > estimate I could find was $,000 Australian.
> I know of a fellow who has a dead Prius. The battery is dead and no
> longer covered by warranty. As you say, the car is not worth a new battery.
> Eventually some third party will start making Prius batteries at a
> competitive price, but Volt batteries will be a whole different deal.
> Vaughn
I read that the Chevy Volt Lithium Ion battery Pack cost
from $0,000 to $5,000 USD. The Chevy Volt Lithium Ion Battery
Pack T-configuration suggest that that it is made of smaller modular
units connected in series or parallel - so it might be viable to
replace only the modules that go *bad* instead of replacing
the entire battery system all at once. In order to extend the life
of the battery, the car's onboard computer needs to prevent the
battery charge level from dropping too low before recharging.
Reportedly in order to extend the lifespan of the batteries to
15 years or 150,000 miles (which allow for Toyota safely
guarantee the batteries for 8 years or 100,000 miles), the
engineers set the car's onboard computer's minumum charge
level for the 2008 Toyota Prius NiMH battery is 60 percent.
What I've been reading ( and please correct me if I am wrong)
is that a replacement Toyota Prius NiMh (static) Battery
Pack now cost about $000 USD.
Posted by Bob F on August 11, 2009, 11:44 pm
Frank wrote:
> Then, where's all the extra electricity going to come from? We have
> brownouts on hot summer days. Imagine what would happen if the
> million electric cars wanted by the Messiah were all plugged in at
> once ;)
They will be charged at night, when surplus power is available.
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>>Two strokes are filthy engines.
> Not ALL 2 strokes, but any two stroke that crankcase scavenges and
> uses total loss lubrication sure is.
> A valve timed, supercharged pressure lubricated 2 stroke engine could
> be VERY efficient, and very clean with todays engine control
> electronics. Particularly with direct gasoline injection.