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Lord help us!
Posted by Allan (more from Allan) on Wed, 15 Jan 2003 09:42:42
In Reply to: Yes, I have it in my auto Aero and 9K auto...., TKC, Wed, 15 Jan 2003 09:13:13
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I'll have to fire up my cold 9-5 and see if it makes my teeth rattle, or, at the very least, my coffe ripple.
This is an engine that performs flawlessly at speed. There are not one, but two counter-rotating balancing shafts to smooth out vibrations that naturally occur with I4 cylinder engines. And, they've used hydraulic bushings on the engine mounts to further dampen idle vibration. In my opinion, they've done a great job.
With any design, or purchase, there are trade-offs. Somehow Saab has figured out how to give us a 4cyl engine that produces 170-250 hp, gobs of torque, and 23-30 mpg. That's incredible. V6s and V8s are inherently smoother -especially when the V angle is 45 deg. But you wind up with more parts, friction, weight, and consequent energy loss.
An "I" configuration engines often package easier in the engine compartment, and often have longer piston stroke -charactoristic of high torque engines. You also get some handling differences. Most who have driven cars with both engines report better handling in the I4.
I'm not an expert on transmissions, but I know that torque converters are selected based on the type of duty the manfacturer expects the powertrain to handle. Performance cars have torque converters that more efficiently couple the the torqe coming from the drive shaft, to the input shaft of the transmission. Remember this is a hydraulic coupling only. TCs also multiply torque. So, there's probably a tradeoff there in terms of how much torque gets multiplied vs. the efficiency of the hydraulic coupling during acceleration.
Robert, I'm sure they could give you a car that has no perceptable idle shake. I'm not sure you'd want it though.
posted by 216.40.163...
Posts in this Thread:
- Decision update, Robert L, Wed, 15 Jan 2003 00:32:34
- Re: Decision update, Rodney, Sat, 25 Jan 2003 20:17:02
- Good observations, liked "less sonorus"....., Mike Lynch
, Thu, 16 Jan 2003 21:44:38 - Your observations..., keeton, Wed, 15 Jan 2003 14:16:32
- What I suspect may contribute to rough idle, dtech, Wed, 15 Jan 2003 11:04:19
- Good for you Robert! I also have a 00 lpt SW, Texron, Wed, 15 Jan 2003 10:08:32
- Transmission trouble???, Roger, Wed, 15 Jan 2003 09:25:28
- Why DOES auto idle roughly?, J, Wed, 15 Jan 2003 00:43:03
- Re: Why DOES auto idle roughly?, Eddienyc, Wed, 15 Jan 2003 10:29:11
- some do, some don't, TB, Wed, 15 Jan 2003 09:08:04
- it's not just a rough idle, Aero'ed, Wed, 15 Jan 2003 07:56:01
- addendum, Aero'ed, Wed, 15 Jan 2003 07:57:54
- Not all of them, Schu, Wed, 15 Jan 2003 07:06:53
- Re: Why DOES auto idle roughly?, Robert L, Wed, 15 Jan 2003 01:36:45
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