The intermediate shaft on the engine cide AEB is used as a balancing shaft, correct?
08-29-2003, 07:19 PM
#3
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link, page 29 item 17
what does this thing do?<ul><li><a href="http://1.8t.org/~quattroman/Audi%20B5%2097-2001/Engine%20Mechanical/1.8T%205V%20(AEB%20&%20ATW)/Engine/13-1%20Engine%20assembling.pdf">here</a></li></ul>
08-29-2003, 07:54 PM
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Re: link, page 29 item 17
<center><img src="http://pictureposter.audiworld.com/60478/old_tensioner.jpg"></center><p>it holds the arm thats attached to the roller for the tensioner. Its the bolt with the blue circle. Thats is the old style tensioner
08-29-2003, 08:11 PM
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that is the tensioner, I was talking about the intermediate shaft which is driven by the timing belt
The tensioning unit is on the left side, the intermediate shaft is on the right side near the crank.
I have read that many four cylinder engines have a gear that stabalizes the crankshaft during low rpms. I am wondering if this is indeed the job of the intermedaite shaft.
I have read that many four cylinder engines have a gear that stabalizes the crankshaft during low rpms. I am wondering if this is indeed the job of the intermedaite shaft.
08-29-2003, 08:33 PM
#6
I don't believe that's what it does.
You're right that many new engines include a balance shaft, but they are typically counter-rotating to quell harmonics. This shaft turns in the same direction. It has a gear at the rear end of the engine that drives the oil pump.
That doesn't mean the shaft doesn't have some sort of balancing effects, such as eccentric weights/cams. I haven't seen one, so I can't tell you for sure. But it's not a true balance shaft because it doesn't counter-rotate.
That doesn't mean the shaft doesn't have some sort of balancing effects, such as eccentric weights/cams. I haven't seen one, so I can't tell you for sure. But it's not a true balance shaft because it doesn't counter-rotate.
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08-30-2003, 10:01 AM
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No. Audi has just started using balance shafts as of 2001.
The new 2.0 in the euro A4 B6 is the first VAG four cylinder to use a balance shaft. The intermediate shaft on the earlier 1.8T is actually a vestige of earlier days of that basic block when it ran the distributor and the oil pump. In fact, later versions of the 1.8T don't even have the intermediate shaft anymore.
Generally, 4 cyl. engines of less than 2.0 displacement have been able to get by without balance shafts. The Audi 1.8T has two other advantages that have made balance shafts largely unnecessary. It's longitudinally mounted and quite far away from the firewall, and secondly, it's turbocharged so the intake charge is more streamlined. This makes the engine quieter and perceptibly smoother.
Generally, 4 cyl. engines of less than 2.0 displacement have been able to get by without balance shafts. The Audi 1.8T has two other advantages that have made balance shafts largely unnecessary. It's longitudinally mounted and quite far away from the firewall, and secondly, it's turbocharged so the intake charge is more streamlined. This makes the engine quieter and perceptibly smoother.
08-30-2003, 04:08 PM
#10
Interesting.. ETKA shows intermediate shaft for AEB and ATW..
Which are the newer ones that don't have the intermediate shaft? I always thought that the shaft did some balancing, though I think most counterbalancers turn opposite the engine..
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