mrz udp

[geldartb]

oh ok never really looked at that side.
ok if thats there for a reason on the stock one then why when they made the ud pulleys didnt they incorporate it into them.

[IsaacHayes]

Rubber between the 2 pieces.

[bszopi]

The rubber ring is embedded inside the damper. You can see it if you look. I'll try to find a picture.

[geldartb]

what the hell is this rubber ring you speak of. every crank pulley from a stock engine hasnt had one. the only thing it has it the metal ring you transfer over.

[34blazer]

all engines need some sort of a harmonic dampener. even tho an engine is internally balanced, doesnt mean that its perfectly balanced. i.e. an inline 6 cyl has a perfect balance theorectically, but thats if its running absolutly perfect. even then it will have undesirable harmonics, if not cancelled out, could destroy the engine. theorectically, a 660 has a mild secondary inbalance which IS noticable. therefor, to sustain the reliability of any engine, a harmonic dampener MUST be used.

[El_Diablo]

our engines are internally balanced and therefor do not use a harmonic balancer, in fact a harmonic balancer and harmonic damper are not the same thing at all contrary to what is stated in that wiki

i'll state it again, an internally balanced engine DOES NOT, need a balancer and will usually do just fine without a damper, i myself have yet to see a 660 crank that, shall we say, "blew up" due to a UDP being installed

if you have such a problem its most likely that your crank already had a fatal flaw (aka a crack) of some sort from the factory or developed one through its life

[sprucegagt]

I highly recommend you reading this.

http://en.wikipedia.org/wiki/Harmonic_balancer

By not having the rubber ring to cancel out RESONANCE (which puts more stress on the crankshaft that it can handle), your engine becomes a ticking timebomb.

If you use an UDP that does NOT have a harmonic damper, then it is not a matter of IF your engine blows up. It is a matter of WHEN.

I'll let you know when my engine blows up. 132,000+ miles of which the last 50,000 have been with a crank UDP. Personally I think operating RPM plays a key part in resonance failures, namely high RPM say above 5,000.

[3100 MPFI]

if you have a balanced engine it'll make no difference, there are more than a few guys running them (udp's in general) without issue

I highly recommend you reading this.

http://en.wikipedia.org/wiki/Harmonic_balancer

By not having the rubber ring to cancel out RESONANCE (which puts more stress on the crankshaft that it can handle), your engine becomes a ticking timebomb.

If you use an UDP that does NOT have a harmonic damper, then it is not a matter of IF your engine blows up. It is a matter of WHEN.

[El_Diablo]

if you have a balanced engine it'll make no difference, there are more than a few guys running them (udp's in general) without issue

[19Cutlass94]

After having a UDP on my 3100, Ill never use one again. Once I take out the engine, that UDP is for sale.

[3100 MPFI]

last time I asked them about it, they said that no they would not seeing the wanted it out to help with the weight savings. They also said something about it not being for all the time use, and RACE ONLY, so most people would not be stupid enough to keep it on their cars (knowing that it does not include the harmonic damper).

That left a bad taste in my mouth. I have put too much time, money, and effort into my engines to let them blow up using a product that is not designed to reduce the risk of damage.

[loner666]

ive got one..no problems yet but hasnt been on long

installed it with alot of other stuff so i dont know if there was a difference

3100MPFI: if you email them i bet they will make you one with a rubber ring in it or make it so one can be put in

[3100 MPFI]

don't have one, and you can't pay me enough to use one. Those don't have the rubber ring to cancel out resonation. Only a matter of time before the engine blows up.

[andrew383]

i have one,does anyone else? how do you like it? good bad and the ugly