Does anyone remember the GM 8-6-4 Engine.. It's BAAACK!

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Old 05-21-2001, 10:16 PM
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Does anyone remember the GM 8-6-4 Engine.. It's BAAACK!

Slightly different, same concept.
http://www.freep.com/news/latestnews...8_20010521.htm

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Old 05-21-2001, 10:19 PM
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I predict failure just like the last time they tried one.
Old 05-21-2001, 10:32 PM
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<font face="Verdana, Arial" size="2">Originally posted by sneakypete:
I predict failure just like the last time they tried one.</font>

I knew a poor woman at work who had one and it spent more time in the shop than out.

In principal it sounds like a great idea, but the car was so messed up, that it was actually in the shop more than it was on the street (I'm not kidding).

So, we shall see -- after the last debacle, people should be wary.



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Old 05-21-2001, 10:34 PM
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I think the hybrid solutions that Ford is promising will make more of a difference than actually working on existing V8s. Put a good size 6 in there and an electric motor that makes 30HP and there you have it.

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Old 05-21-2001, 10:38 PM
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<font face="Verdana, Arial" size="2">Originally posted by gavriil:
I think the hybrid solutions that Ford is promising will make more of a difference than actually working on existing V8s. Put a good size 6 in there and an electric motor that makes 30HP and there you have it.

</font>
If most people knew how much gas they wasted in stop-and-go and uphill/downhill driving they would be begging for little "hybrid" support around town. Also, electric motors make max torque (at least most of them) at 0 RPM!!!



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Old 05-21-2001, 10:41 PM
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Mercedes uses a system like this right now on their v12's (S600, SL600). More than 80% of the time, only one bank of 6 cylinders is operating. Car mags couldn't feel any noticeable lag or stumble when the full complement of cylinders kicked in. Thank modern electronic engine management, and I'd bet GM's system would work just fine at this point.

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Old 05-21-2001, 11:01 PM
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<font face="Verdana, Arial" size="2">Originally posted by gavriil:
I think the hybrid solutions that Ford is promising will make more of a difference than actually working on existing V8s. Put a good size 6 in there and an electric motor that makes 30HP and there you have it.

</font>
I'm not terribly impressed that they can use only half their cylinders and get only 2mpg (or 25%) more economy. Now, if it raised it to say, 20/30 mpg, then I'd be impressed.

And I question how much better the hybrids will do. Anyone ever see the test of the Dodge Dakota hybrid? It used their 6 cyl engine with a battery to get the power of their V8 but only increased the mileage slightly. Seems to me that lightweight materials would do just as much good. It's just damn hard to get 20mpg (city) out of a 4000+ lb SUV.

BTW, gav... nice sig
Old 05-21-2001, 11:10 PM
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<font face="Verdana, Arial" size="2">Originally posted by GoldTypeS:
I'm not terribly impressed that they can use only half their cylinders and get only 2mpg (or 25%) more economy. Now, if it raised it to say, 20/30 mpg, then I'd be impressed.

And I question how much better the hybrids will do. Anyone ever see the test of the Dodge Dakota hybrid? It used their 6 cyl engine with a battery to get the power of their V8 but only increased the mileage slightly. Seems to me that lightweight materials would do just as much good. It's just damn hard to get 20mpg (city) out of a 4000+ lb SUV.

BTW, gav... nice sig
</font>

Comment ---> Everything is a matter of degree. e.g. My wife takes 30-45 minutes to drive 10 miles in a 4-banger and will sometimes get 13 MPG!!!!

If the car is stopped about 50% (or more) of the time, you better believe a hybrid will help. The issue with hybrids is really concerned with energy capacity and energy utilization.

Example 2 -- High acceleration hybrid:

Let's say you take the waste energy at idle (you waiting for 2 minutes at a long light). In lieu of turning off the engine, you leave the engine on and pump-up some high-discharge batteries (or other energy storage device). You know mash the pedal and use the otherwise wasted energy (at idle) to smash yourself forward.

It is all about pulsed energy and energy management.

(just a comment or three...)




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Old 05-21-2001, 11:24 PM
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<font face="Verdana, Arial" size="2">Originally posted by Rock Dog:
Slightly different, same concept.
http://www.freep.com/news/latestnews...8_20010521.htm

</font>
I read in the Detroit News that GM was thinking of going back to DIESEL engines in some cars as a way to improve gas mileage!
http://www.detnews.com/2001/autos/01...a01-226651.htm
YIKES! You'll get GREAT mileage then because the car will be sitting in the dealer's lot for months while they try to get you a replacement engine due to blown headgaskets. That happened to me with my 1980 Olds Toronado. At least they paid for a rental car for several months while I waited for the engine. When it did come in, they had to tow my car 60 miles to Greenwich, CT to put the engine in because that was the only dealer around that received any engines! Figures. Couldn't keep those Greenwich millionaires waiting!

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Old 05-22-2001, 01:48 AM
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<font face="Verdana, Arial" size="2">Originally posted by EricL:

My wife takes 30-45 minutes to drive 10 miles in a 4-banger and will sometimes get 13 MPG!!!!


</font>
And herein lies the reason why I wouldn't live in LA even if you paid me 10 million/year.
Old 05-22-2001, 11:22 AM
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Hey those Valves are were invented right here at where I work at Eaton. My buddies are actually testing them right now. They are at the %30 gas saving mark.

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Old 05-22-2001, 12:43 PM
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Re: Diesels

Volkswagen's TDI engine accounts for nearly 25% of it's worldwide sales. They want to raise that to 50% over the next few years.

The VW TDI engine is seamless and very efficient ... If they could figure out some way to make diesel more appealing to people, I bet many would buy diesel cars and trucks.

If I was buying a Suburban, I'd get a diesel. Ford's diesel F-150 gets about 30mpg on the highway.
Old 05-22-2001, 03:15 PM
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Actually, the 8 cylinder engine that you're describing will only run on all 8 cylinders or only 4 cylinders. Never on 6 cylinders.

Also, when at idle, all 8 cylinders only.

As a matter of fact, the engine will never run on 4 cylinders in the first two gears. From what I've read in the trade mags, the only time 4 cylinders will be used is in the top gears at a light cruise speed.

They also claim that the switch from 4 cylinders to 8 cylinders only takes between .001-.003 seconds and will be totally seamless to the driver.


It would be unfair to realistically compare this engine to the old GM 4-6-8 engine. They're worlds apart in technology.

Should be interesting.

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Old 05-22-2001, 05:03 PM
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the Dodge Ram Diesel engine can go 300K miles before overhaul. Now if thats not a great engine, I dont know what is

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