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Messages - orre_s86

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FE Technical Forum / Re: Chasing a heavy rotating viberation
« on: October 05, 2016, 12:50:49 AM »
The engine is out of the car, and i think that i will change both the flexplate, converter and trans mount before bolting it back together again. But it would be nice to find an obvious reason that causes this.. Really dont want to have to take it out again.

I will check the alligement between converter and crank, havent tougth of that before..

Dont get me wrong, the viberations are there all the time.. But are felt the most in that range. A huge diffrent between 2000 and 1500 rpm.

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FE Technical Forum / Re: Chasing a heavy rotating viberation
« on: October 03, 2016, 03:01:19 PM »
Could some sort of crack on/in the crank cause viberations like this, or would it snap when put under load then? The engine runs strong!

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FE Technical Forum / Re: Chasing a heavy rotating viberation
« on: October 03, 2016, 02:56:21 PM »
Thank you,
Yes i have been thinking that way to but.. No the replicating assembly was not balanced. As there where only a couple of grams difference between the rods so the only big difference where the pistons and my machinist thought that it would be okey for a low rpm engine without balancing as it ran good before. Dont really know the weight difference between forged seal pro 410 pistons and Keith black 390 hypo... Do you think that this could be the problem?

I have been told by a guy very familiar with old fords and way more experienced than me that the viberation is to heavy to have to do with the pistons!? That's the main reason that i started looking elsewhere.. How do i tell the difference?

No, not that i could think of.. Only idee that i have is that i removed material on the flexplate unevenly. And that this caused some sort of unbalance!?

Can i tell somehow if i have an unbalance in the converter? I have always had an moving/rateling sound when driving at higher rpm, thougt that it maybe where from the converter?

No not a 428 crank or flexplate...

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FE Technical Forum / Chasing a heavy rotating viberation
« on: October 03, 2016, 01:28:03 PM »
Hallo,
I am chasing a heavy rotating viberation in my 390 fe.
The viberation is best felt somwhere around 1000-1500 rpm, with gear and without gear. You can feel it both in upprew and downrew, almost more felt when your releasing gas pedal and the engine is downrewing. It feels like a heavy rotating viberation, and can be felt in the whole body of the car.

The engine was rebuilt last vinter with a new block(old was cracked) and changed pistons for more compression. Rods where weight matched.. Dident have a viberation before the rebuilt.

I have changed the viberation damper for a new one allready without any change.
I am thinking that the problem would most likely be behind the engine in the flexplate or converter as the viberation feels so heavy!?

Had enourmus problems removing the flexplate when the motor was taken out, had to be bent of as the center was way to tight on the crank. So before mounting them together again i enlarged the hole slightly with a rotating grinder.. Dont know if this changed anything!?

Messured the crank, flexplate and converter yesterday with a dial indikator while rotating the engine and have this numbers:

0.0011 on the crank snout
0.016 on the viberation damper

0.027 upp and down on the flexplate and 0.031 sideways chucked on the center in a late. But 0.079 in side movement when the flexplate is mounted to the converter..

What do you think of these numbers? Can you se annything that could couse these viberation? How do i tell if the converter has developed any problems?

Thank you/ Oskar

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