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Old 05-22-2015, 06:09 PM   #1
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Default underdrive pulley size

As the title. What is the diameter of an underdrive pulley for a 1.8?

Its a question about the size of it, not about what it will do to an oil pump. I understand that if i fit one it will make the baby Jesus sad and some puppies will also die.

Paul
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Old 05-22-2015, 07:25 PM   #2
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As the title. What is the diameter of an underdrive pulley for a 1.8?
43mm, as measured at the lowest point of the groove.
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Old 05-23-2015, 03:33 AM   #3
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43mm, as measured at the lowest point of the groove.
With stock being 130mm that's a real reduction (1/3 of stock).
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Old 05-23-2015, 05:30 AM   #4
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43mm, as measured at the lowest point of the groove.
Its the diameter i'm after that must be the thickness?

Paul
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Old 05-23-2015, 09:08 AM   #5
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Its the diameter i'm after that must be the thickness?
Nope, the ones I manufacture are 43mm in diameter. They provide a much lower drive ratio than the cheap, aluminum underdrive pulleys you commonly see on eBay. It's almost like the alternator and water pump aren't turning at all.

They're pretty impressive- barely larger than the crankshaft itself.
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Old 05-23-2015, 09:41 AM   #6
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Nope, the ones I manufacture are 43mm in diameter. They provide a much lower drive ratio than the cheap, aluminum underdrive pulleys you commonly see on eBay. It's almost like the alternator and water pump aren't turning at all.

They're pretty impressive- barely larger than the crankshaft itself.
Could you show me one fitted to an engine please?
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Old 05-23-2015, 10:02 AM   #7
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Could you show me one fitted to an engine please?
If I were to post pictures of my revolutionary invention, others would just steal the design and copy it.

You'll have to take my word for it that my pulley improves engine cooling while freeing up at least 10 BHP, improves the longevity of the oil pump gears, and triples your chances of scoring a date with Charlize Theron, all with no negative impact on alternator performance.

I can show you one of the early design concept sketches, though the finished product implements numerous improvements over this early drawing:













Real answer: Is there any one specific pulley you're inquiring about, or were you hoping that all aftermarket pulleys, regardless of who makes them, are of exactly the same dimensions?
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Old 05-23-2015, 10:51 AM   #8
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Its a question about the size of it, not about what it will do to an oil pump. I understand that if i fit one it will make the baby Jesus sad and some puppies will also die.

Paul
this is why i posted the above, maybe what i should of written is please don't take the **** as its just a question if you don't know the answer then don't say anything.

So i don't have to explain please see my build thread. Space is at a premium and need to reduce the diameter of the pulley to make room for a steering rack.
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Old 05-23-2015, 11:04 AM   #9
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Real answer: Is there any one specific pulley you're inquiring about, or were you hoping that all aftermarket pulleys, regardless of who makes them, are of exactly the same dimensions?
And to correct you that's actually a question!
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Old 05-25-2015, 05:10 PM   #10
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You're getting trolled because your question makes no sense. You want to know the diameter of "an underdrive pulley" without specifying which pulley you're talking about, or what brand, or any other details that might help us answer your question. If you want a good answer, you have to ask a good question.
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Old 05-26-2015, 11:42 AM   #11
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<p>
Quote:
Originally Posted by paulw View Post
So i don't have to explain please see my build thread. Space is at a premium and need to reduce the diameter of the pulley to make room for a steering rack.
</p><p>Oh yes King Paul,&nbsp;let us all go out of our ways and find your thread to learn about your shitty build because you simply&nbsp;cant ask a question that makes sense.</p>
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Old 05-26-2015, 11:49 AM   #12
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I dunno why, but I always laugh when people say "take the ****"....it just makes no sense
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Old 05-26-2015, 11:50 AM   #13
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Please take my ****. In your mouth.
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Old 05-26-2015, 11:53 AM   #14
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I dunno why, but I always laugh when people say &quot;take the ****&quot;....it just makes no sense
</p><p>First time I've ever heard/seen that phrase--I thought it was a typo.</p>
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Old 05-26-2015, 12:01 PM   #15
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<p></p><p>First time I've ever heard/seen that phrase--I thought it was a typo.</p>
It's a common expression in British english. To "take the ****" roughly means to mock or humiliate someone.


And, to be fair, we have some expressions in American english which are just as absurd. To quote the great philosopher Beavis: "How come they call it taking a dump when you're really leaving a dump? I mean, you're not really taking it anywhere... "
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Old 05-26-2015, 12:04 PM   #16
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You guys taking the mick out of British colloquialisms?
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Old 05-26-2015, 12:09 PM   #17
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Beavis
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Old 05-26-2015, 02:34 PM   #18
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Well I wasn't expecting that response and also insult. It's a car forum.......
are **** it I was going to be polite but I can't be ****** arsed.....lol it up you bunch of *****. Brain dead! your admit on this forum for **** sake. Show me what you have done on your car yourself or are you too far up your own **** to be able to do so.

It's always the ones that can't do **** all that give the smarmy rude answers.....why because it's easier.

So bring it on dick heads

Paul
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Old 05-26-2015, 02:36 PM   #19
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U wot m8?


It's rather amusing that you're so enraged that you continue to actively not give us the information we need to help you.
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Old 05-26-2015, 02:39 PM   #20
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Well I wasn't expecting that response and also insult. It's a car forum.......
are **** it I was going to be polite but I can't be ****** arsed.....lol it up you bunch of *****. Brain dead! your admit on this forum for **** sake. Show me what you have done on your car yourself or are you too far up your own **** to be able to do so.

It's always the ones that can't do **** all that give the smarmy rude answers.....why because it's easier.

So bring it on dick heads

Paul


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