MINI2

MiniNat · Dec 30th, 2007, 05:39 PM

Hello everyone, im hoping someone can help me. i need to know the diameter of the crankshaft pulley on the supercharged engine. I need the diameter of the pulley that the supercharger drive belt runs on. (i know that the supercharger pulley is 62mm dia).

thanks for any help you can give. (its for a project im doing at uni)
Nat

GTT 280 · Dec 31st, 2007, 02:06 AM

Quote: Originally Posted by MiniNat (original)

Hello everyone, im hoping someone can help me. i need to know the diameter of the crankshaft pulley on the supercharged engine. I need the diameter of the pulley that the supercharger drive belt runs on. (i know that the supercharger pulley is 62mm dia).

thanks for any help you can give. (its for a project im doing at uni)
Nat

...be sure to remain consistent in your measurements... the pulleys are v-grooved.

I guess its arbitrary though, so just make a value up. I think it is about 5 times greater in diameter so not too far from being around 250mm - 300mm. Both pulleys that you mention come in a number of sizes and i think there must be over 15 or so combinations that you can have.

Alternatively wait for a mechano-geek to provide the exact micrometer reading

Cheers,
K.

Fisher · Dec 31st, 2007, 03:07 PM

ratio is 2.07 so you can calculate it.

MiniNat · Dec 31st, 2007, 04:04 PM

thanks for that Fisher, exaclty what i needed to know, cheers.

Fisher · Dec 31st, 2007, 05:18 PM

Sorry I have check it once again and its 2.06 and NO 2.07 (I have said from my head in first reply).

Happy project and new year.

Bye

GTT 280 · Jan 1st, 2008, 08:02 AM

... so based on a 62mm SCharger pulley the crank pulley is 127.72mm (using a ratio of 2.06)

If i run a 15% scharger pulley then it would be 52.7mm and the crank would remain at 127.72mm resulting in a 2.42 ratio.

But i run a 1% oversized crank pulley so this would result in a crank pulley of 128.99mm which means my ratio is 2.45 based on a 15% pulley (values rounded up)

Or is that all wrong?

Cheers,
Albert.

Fisher · Jan 30th, 2008, 06:21 PM

Quote: Originally Posted by GTT 270 (original)

... so based on a 62mm SCharger pulley the crank pulley is 127.72mm (using a ratio of 2.06)

If i run a 15% scharger pulley then it would be 52.7mm and the crank would remain at 127.72mm resulting in a 2.42 ratio.

But i run a 1% oversized crank pulley so this would result in a crank pulley of 128.99mm which means my ratio is 2.45 based on a 15% pulley (values rounded up)

Or is that all wrong?

Cheers,
Albert.

I have seen somewhere the supercharger pulley is 65.5mm.

MINI-Morgan · Jan 31st, 2008, 01:03 PM

So my ratio is 2.51. Thats interesting

Oh wait... or is it 2.56 as the GTT Crank is +4mm.

Has anyone done any testing as to what causes less load on the engine between a +1% crank or just getting a smaller SC pulley?

Dec 30th, 2007, 05:39 PM	#1
MiniNat MINI2 Newbie Join Date: Dec 2007 Local Time: 09:48 AM Posts: 2 Offline	Newbie Question about pulley diameters Hello everyone, im hoping someone can help me. i need to know the diameter of the crankshaft pulley on the supercharged engine. I need the diameter of the pulley that the supercharger drive belt runs on. (i know that the supercharger pulley is 62mm dia). thanks for any help you can give. (its for a project im doing at uni) Nat

Dec 31st, 2007, 02:06 AM	#2 (permalink)
GTT 280 The Power Cube My Classifieds Join Date: Jan 2002 Local Time: 10:48 AM Posts: 2,472 Offline	Study Quote: Originally Posted by MiniNat (original) Hello everyone, im hoping someone can help me. i need to know the diameter of the crankshaft pulley on the supercharged engine. I need the diameter of the pulley that the supercharger drive belt runs on. (i know that the supercharger pulley is 62mm dia). thanks for any help you can give. (its for a project im doing at uni) Nat ...be sure to remain consistent in your measurements... the pulleys are v-grooved. I guess its arbitrary though, so just make a value up. I think it is about 5 times greater in diameter so not too far from being around 250mm - 300mm. Both pulleys that you mention come in a number of sizes and i think there must be over 15 or so combinations that you can have. Alternatively wait for a mechano-geek to provide the exact micrometer reading Cheers, K. Too many mods to list, PM me if the cat needs killing...

Dec 31st, 2007, 03:07 PM	#3 (permalink)
Fisher MINI2 Regular Join Date: Dec 2004 Local Time: 11:48 AM Posts: 234 Offline	ratio is 2.07 so you can calculate it. 14.106@103.83 60ft-2.465sec

Dec 31st, 2007, 05:18 PM	#5 (permalink)
Fisher MINI2 Regular Join Date: Dec 2004 Local Time: 11:48 AM Posts: 234 Offline	Sorry I have check it once again and its 2.06 and NO 2.07 (I have said from my head in first reply). Happy project and new year. Bye 14.106@103.83 60ft-2.465sec

Jan 1st, 2008, 08:02 AM	#6 (permalink)
GTT 280 The Power Cube My Classifieds Join Date: Jan 2002 Local Time: 10:48 AM Posts: 2,472 Offline	... so based on a 62mm SCharger pulley the crank pulley is 127.72mm (using a ratio of 2.06) If i run a 15% scharger pulley then it would be 52.7mm and the crank would remain at 127.72mm resulting in a 2.42 ratio. But i run a 1% oversized crank pulley so this would result in a crank pulley of 128.99mm which means my ratio is 2.45 based on a 15% pulley (values rounded up) Or is that all wrong? Cheers, Albert. Too many mods to list, PM me if the cat needs killing...

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Dec 31st, 2007, 04:04 PM	#4 (permalink)
MiniNat MINI2 Newbie Join Date: Dec 2007 Local Time: 09:48 AM Posts: 2 Offline	thanks for that Fisher, exaclty what i needed to know, cheers.

Jan 30th, 2008, 06:21 PM	#7 (permalink)
Fisher MINI2 Regular Join Date: Dec 2004 Local Time: 11:48 AM Posts: 234 Offline	Quote: Originally Posted by GTT 270 (original) ... so based on a 62mm SCharger pulley the crank pulley is 127.72mm (using a ratio of 2.06) If i run a 15% scharger pulley then it would be 52.7mm and the crank would remain at 127.72mm resulting in a 2.42 ratio. But i run a 1% oversized crank pulley so this would result in a crank pulley of 128.99mm which means my ratio is 2.45 based on a 15% pulley (values rounded up) Or is that all wrong? Cheers, Albert. I have seen somewhere the supercharger pulley is 65.5mm. 14.106@103.83 60ft-2.465sec

Jan 31st, 2008, 01:03 PM	#8 (permalink)
MINI-Morgan MINI Obsessed... My Classifieds Join Date: Nov 2003 Location: Southampton, Hants Local Time: 10:48 AM Posts: 4,611 Offline	So my ratio is 2.51. Thats interesting Oh wait... or is it 2.56 as the GTT Crank is +4mm. Has anyone done any testing as to what causes less load on the engine between a +1% crank or just getting a smaller SC pulley? One Man, One Project......find out what happens next at MINIProject.co.uk For MINIs in the south it can only be South Coast New MINI Club

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