Re: Under Drive Pulleys..and the problems they cause.
 

Putting the stock damper back on will prevent any further accelerated wear and greatly reduce chances of oil pump failure. Oil pumps fail on sevaral other makes of cars that have DOHC's and use the crankshaft as a drive mechanism so it's not that uncommon. Just dont run a cheap damper in conjunction with high RPM, nitrous or blowers and the engine will live a long happy life.

Re: Under Drive Pulleys..and the problems they cause.
 

I bought my 01 Cobra with BBK pulleys on it. The previous owner said he put them on a month before I got the car. 7 months later my oil pump came apart and destroyed my motor. 80k miles, only used mobil 1.
http://i178.photobucket.com/albums/w...ps34e31e6b.jpg

Re: Under Drive Pulleys..and the problems they cause.
 

Brutal.

Re: Under Drive Pulleys..and the problems they cause.
 

How much would it be to get the gears and have them installed by a shop?

Re: Under Drive Pulleys..and the problems they cause.
 

Probably cost $200 - $300 in labor on the high side.

Re: Under Drive Pulleys..and the problems they cause.
 

My replacement came with bbk UD pulleys. I took the crank off and replaced it with my old stock one because it looked very disturbing and just weird with the longer bolt. I left the water pump on. Is that going to effect anything?

Re: Under Drive Pulleys..and the problems they cause.
 

Larger pulley's on the accessories works well but it's a good idea to get the correct length belt to keep the correct belt tension.

Re: Under Drive Pulleys..and the problems they cause.
 

Yeah i tried my belt and it didn't fit. Anyone know what size belt to run with stock everything except for the water pump pulley?

Re: Under Drive Pulleys..and the problems they cause.
 

The best way is to install the stock pulley and run a seamstress tape around the entire route of the belt and take a measurement. Do the same with the larger pulley and note the difference then look for a belt that matches.

Re: Under Drive Pulleys..and the problems they cause.
 

Is this the bbk style ud pulley that causes oil pump failure as well even if the engine is being shifted @ 6k?

http://i41.tinypic.com/2qtl5hc.jpg

http://i40.tinypic.com/33k4uhu.jpg

Re: Under Drive Pulleys..and the problems they cause.
 

I'm not a big fan of those because they often don't center accurately but I don't think any underdrive damper will destroy an engine kept at 6k or under. On a 4.6 the strong harmonics don't kick in until 6500 RPM.

Re: Under Drive Pulleys..and the problems they cause.
 

I ordered MARCH pulleys, but I got a email back saying it's back ordered so I just cancelled it and plan on getting some later on.

Re: Under Drive Pulleys..and the problems they cause.
 

Even the 99 cobra guys had problems with the bbk ud pulley . :/ hope your motor wasnt completely trashed mam. :(

Re: Under Drive Pulleys..and the problems they cause.
 

With all 4 March pullies do you have to run a different belt?

Re: Under Drive Pulleys..and the problems they cause.
 

Yes all 4 you need a 950k6 belt, if you do all three besides the alt its a 945k6, if you only do the march dampner its a923k6 FYI

Re: Under Drive Pulleys..and the problems they cause.
 

What do you guys think of the summit racing ud pulley? http://www.summitracing.com/parts/su.../model/mustang

Re: Under Drive Pulleys..and the problems they cause.
 

Honestly I'd run March fluidamper or ati only on these motors.
One thing I liked about the March is that it weighed more than the stock damper.