General Floating for Interest -- steel crankshaft pulleys

fingers99 · May 3, 2012

In the next 2 or 3 months I should be in a position to do a small run.

They'll be steel, plated, with separate steel woodruff keys, to 1.4 16v pattern (so folks using them on older engines will need a later cam pulley, belt and water pump).

No solid idea of price yet -- depends on size of run, as setting up is a pretty much fixed cost -- but under a hundred quid.

whitz · May 3, 2012

im wondering what sort of extra power or torque this would take to say just machining in a separate key into the original pulley?

Ash

Brooky · May 3, 2012

Who's making them?

I want one for a 1242 8v I was going to look into it when I get Round to building an engine

fingers99 · May 3, 2012

Brooky said:
Who's making them?

I want one for a 1242 8v I was going to look into it when I get Round to building an engine

I hope -- a certain company in W. Yorkshire with a long history of behind the scenes motorsport manufacture.............

Brooky · May 3, 2012

whitz said:
im wondering what sort of extra power or torque this would take to say just machining in a separate key into the original pulley?

Ash

Think the main reason steel pulleys were originally made was because they disintegrate at high rpm

fingers99 · May 3, 2012

whitz said:
im wondering what sort of extra power or torque this would take to say just machining in a separate key into the original pulley?

Ash

I think a fair bit -- main issue with the original ones is that they're made from really poor material.

Brooky · May 3, 2012

Will this said company???? Do one off's or is it just batches?

whitz · May 3, 2012

fingers99 said:
I think a fair bit -- main issue with the original ones is that they're made from really poor material.

indeed had this a few times stripping engines down, its just the small key that breaks off tho

so surely if you had a replaceable steel wood ruff key it would be much better, as if would either snap the steel wood ruff key, blow the pulley to bits or rip the pulley to bits

admittedly there would some implications with machining the original pulley square to fit the key

Ash

fingers99 · May 3, 2012

Brooky said:
Will this said company???? Do one off's or is it just batches?

At a reasonable price, I'd think a batch is the only way to go.

I'm no machinist, but I'd buy in the bar stock, turn to o/d, then mill the slots for the belt -- cut down drastically on the set up and machining time.

whitz · May 3, 2012

2 more lil things id like to know before id put cash out is

What sort of weight increase would there be over the stock item.

also, would it be a separate key or a key build in like the original part? as if it is together it would bump the costs up a fair wack or be a slight bodge to get the shape in the pulleyas there isnt really a radius on the key mating face

hope munkul doesnt mine me using a pic of his
http://i219.photobucket.com/albums/cc234/munkul/Stage 2 Punto/SDC12867Medium.jpg

Ash

Brooky · May 3, 2012

Depending how they machine it, it could be heavier or lighter. Shouldn't make much of a differance as its such a small diameter

fingers99 · May 3, 2012

also, would it be a separate key or a key build in like the original part? as if it is together it would bump the costs up a fair wack or be a slight bodge to get the shape in the pulleyas there isnt really a radius on the key mating face

Seperate key. Otherwise I think the only economic way is casting or sintering.

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