Engine vibration, no balance shafts....

[b00stAdict]

ok for my mods, since i haven't updated my profile yet... (sorry) i just rebuilt a 6 bolt block, had it bored out .030 (.75 pistons), had my crank polished, .25 main bearings, .5 rod bearings, rebuilt head with all goodies including 3g revised lifters, evo 3 big 16g, ported o2 housing with external dump, 3" custom turbo back exhaust with Greddy muffler.

ok now to my story....
Just rebuilt the motor, got it on the road last night, did a few pulls to seat my rings, the motor runs, idles, and drives fine, its just this vibration that annoying the F*ck out of me.


so i know what almost everyone is going to tell me is that my oil pump is out of phase... which it could be the culprit but how do i tell exactly because i know that when you have the balance shafts you either A) stick the screw driver in the side of the block, or B) rotate it till it falls to the left, well without the balance shaft there is no real defined "tension" on the sprocket so it falls both ways. meaning if i have it one way it will fall to the left, if i rotate it 180* it will still fall to the left, so i guess my question is how do i check the oil pump sprocket and make sure it is in phase.... just set the timing marks where they line up, take off the belt, and rotate the sprocket 180* from where its line up now?? thats my only idea i guess if anyone else has any ideas let me hear them please.


thanks again in advance!

 

[13b Bro]

It doesn't matter where you line the oil pump gears up after you have eliminated the balance shafts

 

[1990AWD]

As stated, if you installed the stubby shaft for the oil pump with a BSE kit, it doesn't matter the timing of the oil pump.

It may not be much, but did you have your bottom end balanced? Could just be a slightly out of balance coupled with no balance shafts anymore.

What condition is your engine mounts in? They could be badly worn.

 

[SrKegler]

Without balance shafts you're going to get vibration. Usually around 2500-3000 RPM is where it's the worse. That was the purpose of the shafts in the first place.

 

[J_DiZ]

Also you will feel it more if you have urethane motor mounts. I have damn near solid mounts and my car vibrates crazy, but I knew that going in and it doesn't bother me.

 

[b00stAdict]

It doesn't matter where you line the oil pump gears up after you have eliminated the balance shafts

OK.. good to know..

As stated, if you installed the stubby shaft for the oil pump with a BSE kit, it doesn't matter the timing of the oil pump.

It may not be much, but did you have your bottom end balanced? Could just be a slightly out of balance coupled with no balance shafts anymore.

What condition is your engine mounts in? They could be badly worn.

well long story short, i had jasper motors rebuild it a while back (the first time, just a stock rebuild, and had the balance shafts removed then, on the lower left balance shaft there is no stub just a "metal cover?" type deal with a punch in the middle to seat it basically, i don't really know how to explain it,... and then for the oil pump on the back side the is nothing either its just the oil sprocket nothing behind it.. it ran very smoothly before and now that i had it rebuilt a second time, there is some serious vibration. and no i haven't had it balanced since the rebuild the first time...

Without balance shafts you're going to get vibration. Usually around 2500-3000 RPM is where it's the worse. That was the purpose of the shafts in the first place.

duhh (thanks for the input though..)

Also you will feel it more if you have urethane motor mounts. I have damn near solid mounts and my car vibrates crazy, but I knew that going in and it doesn't bother me.

really...?? i do have urethane motor mounts, but I've never noticed the vibration as bad before.. just curious, because i had a talon before and i had put the timing together with the oil sprocket in 180*of phase and it vibrated like hell and if i remember correctly it kinda feels the same... any insight???

 

[SrKegler]

sorry, didn't know this was the 2d rebuild.

 

[b00stAdict]

It doesn't matter where you line the oil pump gears up after you have eliminated the balance shafts

As stated, if you installed the stubby shaft for the oil pump with a BSE kit, it doesn't matter the timing of the oil pump.

It may not be much, but did you have your bottom end balanced? Could just be a slightly out of balance coupled with no balance shafts anymore.

What condition is your engine mounts in? They could be badly worn.

Without balance shafts you're going to get vibration. Usually around 2500-3000 RPM is where it's the worse. That was the purpose of the shafts in the first place.

Also you will feel it more if you have urethane motor mounts. I have damn near solid mounts and my car vibrates crazy, but I knew that going in and it doesn't bother me.

sorry, didn't know this was the 2d rebuild.

its all good man i appreciate the input, sorry i was just being a smart ass