New 440/4sp vibrating

[Dodgerdallas]

Ive got about 215 mi on the new engine and from the beginning theres been a vibration when its running,took it to a good shop and had them tune it out but they said they couldn't tell where it was coming from,the balancer in correct for a forged crank and the flywheel is new from Brewers and supposedly balanced for the setup,you can feel and visibly see the vibration(steering wheel/shifter vibrates) when I gun it and it disappears as higher RPM.The engine is from S&J Engines out of Spokane,Wa and was tested on a SIM(?) machine when built-any help would be appreciated...

[Cooter]

Right at, or around 2000 rpms?

[Dodgerdallas]

It starts at idle and goes away around 35 mph or 4th gear-sorry don't have a tach

[John_Kunkel]

Was the rotating assembly balanced when the engine was built?

[Dodgerdallas]

I'm not sure but I would guess no on the engine,all I know is everythings new and was rotated on the machine and checked for compression,oil flow,etc.I was told I had a forged crank,in which I acquired the correct balancer and supposedly got everything correct from Brewers (flywheel,etc).The vibration disappears at cruising speed

[cdr]

DOES it do it in neutral ?

[Dodgerdallas]

Yes a little then increases a bit the goes away as rpm increase

[cdr]

sounds more like a drive line problem,,drive shaft,u joint,trans mount,trans bearing.

[Dodgerdallas]

Probably not,it's a 4sp and does it in neutral

[cdr]

you said a little in neutral. is it worse when driving,in gear accelerating?

[A383Wing]

I'm gonna guess mis-matched balancer, crank, & flywheel

[Cooter]

You say you 'aquired' the forged crank. Was it a cast crank engine you ADDED the forged to?
if you simply bolted in the crack and didn't rebalance the engine, you will need to...

[Dodgerdallas]

I got the engine from S&J engines in Spokane wa and was told by my salesman it was a forged crank,my bslalancer I was told by the salvage yard was for a forged crank and was verified by the shop that tuned the engine-they work on mopars regularly

[Dodgerdallas]

The crank wobbles slightly thus making the pulley wobble a bit more,the shop said that's not the problem-any thoughts on that?

[A383Wing]

find another shop, and that engine company you dealt with has been known for crap engine rebuilds

[firefighter3931]

The crank wobbles slightly thus making the pulley wobble a bit more,the shop said that's not the problem-any thoughts on that?

Hi John  

The crank should not wobble at all. My guess is that you have a bad harmonic balancer. With old factory balancers the problem becomes the bonded rubber that is between the hub and outer ring. Over time the rubber vulcanizes/hardens and the outer ring will slip or become loose....this in turn throws the balance off.

I don't like to use old factory balancers for this reason. I've seen this happen before.  


Ron

[BrianShaughnessy]

Browse this info on balancers from the 440 website.  http://www.440source.com/dampers.htm

See what you got there.

[Dodgerdallas]

So Ron ur saying thar could possibly be my problem since it's not that severe ?

[Dodgerdallas]

...and yes I meant the balancer wobbling not the crank

[firefighter3931]

So Ron ur saying thar could possibly be my problem since it's not that severe ?

 
Yep...i'd say the balancer is a problem. I'd replace it 


Ron

[firefighter3931]

...and yes I meant the balancer wobbling not the crank

I knew what you meant John. 

It's pretty rare for the crank snout to be bent....especially when this engine is fresh from the machine shop.

For sure they would have verified straightness before assembly.


Ron

[Dodgerdallas]

Thank you sir,I'll look for one

[firefighter3931]

Hey John, have a look at the link :

http://www.jegs.com/i/Professional+Products/428/80013/10002/-1

These Professional Products dampners are descent quality.    The black coloring makes it easier to read the timing marks when making adjustments. 


Ron

[Dodgerdallas]

Thanks Ron,this is the one I ordered from Summit before I got your link (sorry I don't know how to forward the page) #SUM-C4279,Im hoping its the correct one, I have the belt pulley with the "odd" bolt hole that doesn't line up unless you have the correct pulley/balancer combo-the tech dept there told me it was the right one for a forged crank (internally balanced) but couldn't tell me about the pulley bolt and I cant tell from the pics-getting her tomorrow so we'll see! Thanks for the response...

[firefighter3931]

Sure, that one will work fine John 

I have one very similar to that on mine. Before installing it take a sharpie and draw a black line across the 35* mark. In the daylight those scribed numbers on the polished balancer are hard to see with the timing light. That is why i suggested the black balancer. 

Let us know how it turns out 



Ron