Balancer Shafts
#1
Balancer Shafts
Does anyone know why the xB and xA engine does not have balancer shafts? Almost every 4 cyl. I have ever torn down has a set but not the scion. Why? I also noticed the motor has a lot of vibrations, I wonder if this is because it has no balancer shafts? Any imput would help.
#2
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Scinergy
Join Date: May 2005
Location: Buckley AFB, CO
Posts: 869
hmmmm, im not sure about this either. maybe because the engine was designed a while ago... like '99 i think, when balance shafts were still in more expensive 4-cylinder models?? thats the only thing i could come up with. i think its still a smooth engine... and quiet, even without the shafts. but if it had the shafts then it probably wouldnt be as buzzy over 4,200 rpm, but its not that bad.
#3
The old mitsubishi motors that came in eclipse's and stuff even had balancer shafts, and their engines go far back I think the 4g63 motors even had them. I just wish the motor had that smooth feeling, My SRT-4 has them and I love the way the motor runs above 3500rpm, and I wish the xB was the same.
#5
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Scinergy
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Location: Buckley AFB, CO
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but those mentioned engines above are from sports cars, a category where the buyers are a little more picky. and those are performance engines. we have sub $15k sub-compacts where the driver is expected to just want reliable cheap transportation for the long haul. plus we have eco-minded engines, not performance. plus, when scion released, toyota already had thier "not to exceed" price range and maybe putting balancer shafts into the engine would have pushed them past that point? i know that is the reason that the scion xA does not have VSC and TCS like the xb because it would have put it past te "not to exceed" price point.
maybe our small engines arent compatible with them and building one that was would have put it past that "not to exceed" price point??? im sure theres a logical reason we just cant figure it out... please give me credit for tryin, lol
maybe our small engines arent compatible with them and building one that was would have put it past that "not to exceed" price point??? im sure theres a logical reason we just cant figure it out... please give me credit for tryin, lol
#7
This is hilarious. People here WANT balance shafts for their engines. Go to 4G63 forums, and you can find kits to ELIMINATE balance shafts. A well designed, ECONOMY car engine shouldn't need balance shafts. Especially one of such small displacement. Same reason we don't have harmonic dampeners on the crank.
Mike
Mike
#8
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Team N.V.S.
balancing shafts are normally in oversquare motors , and/or larger displacement 4 cylinders.
hell with a sentra if you remove them ( lessening service life but...) you gain like 13 or 14whp
hell with a sentra if you remove them ( lessening service life but...) you gain like 13 or 14whp
#10
Originally Posted by Pimp_Sling
... A well designed, ECONOMY car engine shouldn't need balance shafts. Especially one of such small displacement. Same reason we don't have harmonic dampeners on the crank.
#11
Originally Posted by foxtrot685
ok so i was on the right track with trying to figure out why we dont have them... lol
#12
Senior Member
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Team N.V.S.
Originally Posted by vintage42
Originally Posted by foxtrot685
ok so i was on the right track with trying to figure out why we dont have them... lol
#13
Originally Posted by Pimp_Sling
This is hilarious. People here WANT balance shafts for their engines. Go to 4G63 forums, and you can find kits to ELIMINATE balance shafts. A well designed, ECONOMY car engine shouldn't need balance shafts. Especially one of such small displacement. Same reason we don't have harmonic dampeners on the crank.
Mike
Mike
#14
to tell you the truth most older engines had balancer shafts and alot of newer motors dont and i also own a srt-4 i also removed my balencer shaft and i have solid motor mounts and you cant tell a diffrence with or without them. the main reson thay install balencer shafts is because older engines where way out of balence and it was the cheap way to solve it now most cranks, conecting rods and pistons are so close to spec theres no need for a balencer shaft.
#15
Originally Posted by fullspool
... the main reson thay install balencer shafts is because older engines where way out of balence and it was the cheap way to solve it now most cranks, conecting rods and pistons are so close to spec theres no need for a balencer shaft.
#17
all i now is every 300+hp srt and 4g63 motor removes there balecer shaft(s) the srt only has one balencer shaft. and the only reson its in the motor is for the memovel of very small vibrations above 3000 rpm. this was all coming from a tech that designed the srt-4 motor thay get on the srtforums once in awhile he also said that it was talked about many times to leave it out of the srt but it would make more hassel and actualy cost more because the machine assembels the motor would have to be compleatly reprogramed just to leave it out and thay would have had to make a diffrent assembely book for the srt motro. so the balencer is only there for small vibration over 3000rpm and othere then that its just a 30lb 25hp robbing steel rod.
#18
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