DBA
I'm going to rallye with a Justy
Posts: 121
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Post by DBA on Nov 25, 2004 8:12:10 GMT -5
Hi,
does anyone of you guys have removed the balancer shaft? If so what chain did you use? How is the engine feeling then?
Greetings, Klaus
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Post by RustyJusty on Nov 25, 2004 16:16:49 GMT -5
I removed the balancer shaft by cutting the shaft from the sprocket... that way the chain stays the same and the water pump will still work. However, the engine died a few weeks later but I'm not sure if it was due to the cut shaft or not. While it was working, the only vibration came at idle, but I found no difference in engine power. Look for my posts in the engine mod section.
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DBA
I'm going to rallye with a Justy
Posts: 121
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Post by DBA on Nov 26, 2004 7:11:59 GMT -5
Hi RustyJusty, I don't think cutting off the balancer shaft is a good idea... This very likely will allow the slide bearing to cant and thus seize So imo the only way to do it would be to remove it completely and use a standard chain. If this is going to last long is to be discussed OTOS it just has to drive the oil pump. So the stress shouldn't be that high and a normal bicycle chain might work. What did the engine look like when it died? How was the condition of the slide bearing of your modified balancer chain? Greetings, Klaus
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Post by JLantz on Nov 28, 2004 11:08:26 GMT -5
Why would you want to remove the balancer shaft?
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DBA
I'm going to rallye with a Justy
Posts: 121
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Post by DBA on Nov 29, 2004 4:54:49 GMT -5
JLantz: To reduce rotated masses. It would mean that I don't have to remove that much material from the fly wheel. I fear that removing too much might end in a desaster So the 2 or 3 kg of the balancer shaft would make a good start. What do you think? Greetings, Klaus
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SubieGuy
The guy who put a boxer in a Justy. :)
Posts: 191
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Post by SubieGuy on Nov 29, 2004 8:26:12 GMT -5
It is there for a reason. As Justy has odd number of cylinders, you need a balancer to be err, "balanced". If you remove it, you reduce the rotational inertia, but you induce different stresses on the block, and of course different vibration pattern. I suggest you do it in a seperate block you can ruin, and do not expect it to last long. But if you see the world record breaker justy thread, the guys there have also removed the blancer shaft to turn 12.500 RPM!
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DBA
I'm going to rallye with a Justy
Posts: 121
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Post by DBA on Nov 29, 2004 8:41:37 GMT -5
The question is - is it really there to remove stresses from the block, or is it just to make the engine feel not too rough. Example: I know that small 4 banger engines from VW have balancer shafts also. But just to calm down the engine. The point about the balancer shaft is at all, that it shouldn't change anything to the block. The block/engine attachments might have more load. But the vibration in the block should be the same. I don't know how to explain that correctly - hope you understand what I mean. Greetings, Klaus Edit: Now one thing comes to my mind... RustyJusty: Did you close the oil duct of the rear slide bearing of the balancer shaft? If not your engine probably died due to missing oil pressure at the last bearing of the crank shaft.
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Post by RustyJusty on Dec 3, 2004 19:14:24 GMT -5
no I didn't (re rear slide bearing).
I havn't opened the engine since it quit.... I race the hell out of the car and do a lot of offroading, so this isn;t the first engine to die.
What will you do about the water pump?
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Post by Rovah on Mar 25, 2005 17:54:23 GMT -5
Just tore down my engine and had a look around inside.
So, has anyone actually removed the balance shaft and had the engine live?
I know that there are electric water pumps that can be used.
Not sure how you'd drive the oil pump though.
It would be nice to remove all that weight.
Cheers! John
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DBA
I'm going to rallye with a Justy
Posts: 121
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Post by DBA on Mar 28, 2005 20:47:19 GMT -5
ok, so not closing the oil duct explains the failure of the engine. You loose all oil pressure at least at thea last bearing and also on all other bearings. I''m planning in cutting the balancer shaft too and fitting the other slide bearing the wrong way to close the oil duct. This way the water pump would still be the original. The chance that the bearing will cant is acceptable after thinking about it long enough. I'm not sure - but I'll give it a try Greetings, Klaus
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