So i have been battling a vibration in my car since the engine was rebuilt. i also converted over to a t5 at the same time. the vibration starts around 2k rpm and gets a lot worse as the rpms increase. I originally thought it was the pinion angle.
Now that i have installed a new rear end and thoroughly inspected the previous rear end and the before and after pinion angles i am ruling this idea out.

one thing that is throwing me off is the fact that the vibration is in effect with AND without the car moving. this is what lead me to believe that it was the input shaft. so i took out the t5 and the bearings are fine.

so i am now looking at the engine and its components. when i had it rebuilt they balanced the internals. when you balance a engine and the internal parts, do you need to have the flywheel connected to the crank. I think this may be so since ford designed these engines to be counter balanced using the flywheels.

I am running the original flywheel from the car. it originaally had the 3spd.

I also replaced the harmonic balancer with a new unit. could that be it?

 

So you are saying the vibration occurs when you drive the car and engine gets above 2000 RPM AND when the car is at a dead stop with the clutch in and free revving to 2000 RPM??? It feels the same either way?

-Gun

 

yes pretty much. it does not matter wether or not the clutch is in or if it is in gear or not. the vibration is there. it is worse while driving but either way it is there.

I am going to run it tomorrow with the trans out to see if it is there also.

 

Thats probably not necessary.

If the car is at a dead stop and it vibrates with the clutch in that rules out everything from the flywheel back.

The input shaft would be spinning slowly with the clutch in as its only connection to the engine is the clutch disc which would would not be engaged to the engine if the clutch where pressed in. Further more the input shaft isn't heavy enough to cause a vibration at 2000 rpm and still be even remotely functional (it would have to be bent like 20 degrees or more) That goes for all the crap in the transmission.

The driveshaft, axel shafts, wheels are the only things with enough mass after the flywheel to cause a vibration at 2000 rpm...BUT those aren't even spinning.

So it could be a balance factor on the flywheel or damper wheel that is wrong. They should be 28oz

What Oz BF did you get on your damper wheel...52 oz right?

-Gun

 

like gun said, if you have the car in first gear, press the clutch then the input shaft will be at standstill when engine is running and car at standstill. if you do that and it's still vibrating then the problem is engine or flywheel. if the engine is running bad it might be running on 4 cylinders only, or spark plugs wrong order etc .. but if the engine is running good I'd say engine/flywheel/damper balance is the problem. you might have the wrong flywheel or balancer (28oz/50oz)

 

I am thinking it is the balancer. I will go through my reciepts and see if i can find the part # for the balancer.

I am running the original flywheel. i will post a pic of it.

 

here is a pic of my flywheel. as you can see it is the original part # and part from ford

 

yes. Please get part# of balancer. I bet you it's a 50oz. can yopu get that number on the flywheel for us? the big one: Cxxx-xxxxx. but I believe just the C in front being a 60s part should make that thing a 28oz imbalance. let's see what the experts have to say
(and don't run this engine until problem is resolved. you end up with all sorts of trouble. Starting with loose bolts and ending with cracking bearings, mounts ...)

 

C30E-6380B
and the date code is 5H9

I will have the balancer part # later

 

here is a link to the balancer that i have.

http://www.racerworld.com/viewItem.cfm?IK=19717