I'm looking at a set of lightweight alloy pulleys for my Zetec (anodised red ) and wondered if anyone had any thoughts on if they are worth the
effort or not.
The engine is 2lt in 45mm Jenveys with 285 Pipercams & vernier cam pulleys
Do we think that crank / waterpump and idle pulleys would make any difference ? Car already has a lightweight alloy alternator pulley
Lightweight crank pulley may make a difference to engine performance..
You say it has vernier pulleys, are they not ali and already lightweight???
Yeap...already got Vernier Pulleys. Interested in the Crank Pulley aiding performance...
The standard crank pulley on a silvertop is of a two piece metal construction with a bonded rubber middle to the sandwich. This may serve a crank
vibration damping function. if it does, it is not a good idea to remove it.
Mal
As said most modern engines use a torsional damper design, which if done away with you risk snapping the front the crank off. However they arent that
effective and can be done away with, for most older cars didnt have them and considering the limited mileage of a kit I wouldn't worry. Also alot
of tunned turbo engines, which produce alot of torque (ie twist the crank more) do away with the damper and dont fail
Im currently designing my own pulley and had have looked at these issues
Also, what is they say for every pound of the crank you effectivly get 1bhp. Don't know how much truth is in that how ever
quote:
Originally posted by goodall
Also, what is they say for every pound of the crank you effectivly get 1bhp. Don't know how much truth is in that how ever
I read somewhere that 1kg off the rotating mass is the same as 10gk's off the weight of the car as far as acceleration goes - I have ally pullies and flywheel (something like 10kgs of rotating mass removed....) and it sure does pick up well
quote:
Originally posted by clairetoo
I read somewhere that 1kg off the rotating mass is the same as 10gk's off the weight of the car as far as acceleration goes - I have ally pullies and flywheel (something like 10kgs of rotating mass removed....) and it sure does pick up well
Are they the underdrive things?
I fitted a set of these to my mates st170 it made no noticable differenence but i think he said it should give 2hp more or something.
quote:
Originally posted by clairetoo
I read somewhere that 1kg off the rotating mass is the same as 10gk's off the weight of the car as far as acceleration goes - I have ally pullies and flywheel (something like 10kgs of rotating mass removed....) and it sure does pick up well
Certainly a reduction in rotational mass should improve engine response which, in turn, will aid acceleration. I would be very surprised if there was
a increase in actual power output.
Lightweight flywheel is already on the list and the pulleys anodised red would be very bling
quote:
However they arent that effective and can be done away with, for most older cars didnt have them and considering the limited mileage of a kit I wouldn't worry.
If you did remove the Ford designed damper you would need to balance pistons and rods to get them even then rotationaly balance the crank, flywheel, clutch cover and front pulley of your choice.