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Lightweight crank pulley

Hi, I'm a machinist from Greece, and i have made some pulleys for Alfa's,Fiat and Lancia's engines.

Please check my ebay advert, and feel free to ask me any questions.

http://www.ebay.co.uk/itm/Lightweigh...item3cec15b815
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Are they 5 vee or 7vee?
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(Post Link) post #3 of 39 Old 12-11-14 Thread Starter
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Hi, if you mean, how many V's they have, it's 6 vee.
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Yip, best to keep to the 6PK standard belt

That is quite nice!

Would you be willing to ship to South Africa? Any idea what shipping costs might be?
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Thanx Gertie.

No problem to send to south africa. I think it should not be more than 20gbp.
Once i sent to Singapure for 20gbp.
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Got one for my Twinspark. Does make a difference. Mainly from a smaller diameter and 900g off the weight (10% total mass from crank).

Thought the V6 though was balanced with the crank...?
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We would buy GTA ones

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(Post Link) post #8 of 39 Old 12-11-14 Thread Starter
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Sorry Ned, I have not made any GTA's pulleys, because i don't have the original sample to measure it.
If you can arrange to send me a sample, i can do that.
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Quote:
Originally Posted by Sotos_GTA View Post
Sorry Ned, I have not made any GTA's pulleys, because i don't have the original sample to measure it.
If you can arrange to send me a sample, i can do that.
Email me your address and I will send you one [email protected]

Ned
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(Post Link) post #10 of 39 Old 13-11-14 Thread Starter
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Done. Thanx Ned
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What's the material? I'd be probably interested in standard sized GTA one too.
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Originally Posted by yan.ko View Post
What's the material? I'd be probably interested in standard sized GTA one too.
As mentioned in the ebay advert, its 2007 billet alloy.
When i have some GTA pulleys ready, i'll let you know.
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Hi guys.
Is this something I could fit at home or is it a garage job to retention the belt.also if I get a standard jts unit what real performance benefits would I see? I am guessing more free revving as engine will spool up quicker but I am fairly new to playing with engine bits.
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Quote:
Originally Posted by Sotos_GTA View Post
As mentioned in the ebay advert, its 2007 billet alloy.
When i have some GTA pulleys ready, i'll let you know.
Ah, overlooked that. Thanks.
Btw. any chance for 7075 alloy?

Last edited by yan.ko; 14-11-14 at 01:24.
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Ah, overlooked that. Thanks.
Btw. any chance for 7075 alloy?
No 7075 need for this application. The only disadvantage of 2007 is environment corrosion, that's why i have hard anodised the pulleys.
30.000kms on my 156 1.8 and many other happy owners from alfisti.gr with absolutely no issues.
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I noticed the 3.0V6 GTV has probably different pulley than GTA (as the number in ePer differs).
Ned, do you have the chance to measure diameter or circumference of these two please?
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Quote:
Originally Posted by yan.ko View Post
Ah, overlooked that. Thanks.
Btw. any chance for 7075 alloy?
No need for 7075 - i've seen many pulleys made from cheapest alloy money can buy with no problems, had one 5 years since......
But it's almost impossible to make one for V6 engines, it have counterbalance and it's hard to produce one......
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im not an alfa man so googled some images of those v6 pulley

Attachment 420137

Attachment 420145

I see the counterweight issue but nothing is too hard to recreate on modern cnc machines, unless your talking about the weight of the pulley cant be messed with as a complete unit.
otherwise the counterweight section could be manufactured in a heavier material to keep the offset of balance ?
whats its original purpose ? why don't the others have them ?

Last edited by sussexa; 02-12-15 at 20:11.
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Quote:
Originally Posted by yan.ko View Post
I noticed the 3.0V6 GTV has probably different pulley than GTA (as the number in ePer differs).
Ned, do you have the chance to measure diameter or circumference of these two please?
The pulleys are interchangeable (same fitment) but have a different sized counterweight inside, so really you should use a 3.0 pulley on a 3.0 engine and 3.2 pulley on 3.2 engine etc. Swapping them would put the bottom end out of balance, might not result in any consequences in the short-term but long term it can't be good.
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(Post Link) post #20 of 39 Old 16-11-14 Thread Starter
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I didn't know the V6's have counterbalance on their pulleys.
I can do that, but i think i should not.
Even if an alloy pulley is created with a heavy part on it as the OEM, is should be better the crankshaft be balanced again with the new pulley.
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That's the problem with the V6 crank. Its all balanced together. The Twin spark you can get away with due to it being balanced and an inline 4.
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Also what size Aux belt do you need for the Twin spark under drive pulley on say a 1.8 engine.
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On a friend's Fiat Barchetta(1.8) the OEM belt was 1795mm and he fitted 1750mm for the underdrive pulley.
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So that is 45mm shorter:
Alfa Romeo 156 Auxiliary Belt
1.6 / 1.8, no AC uses: 6PK1035, so a 6PK990 will work
1.6 / 1.8 with AC: 6PK1842 - a 6PK1800 will work
2.0 with AC: 6PK1975 - a 6PK1930 will work
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So that is 45mm shorter:
Alfa Romeo 156 Auxiliary Belt
1.6 / 1.8, no AC uses: 6PK1035, so a 6PK990 will work
1.6 / 1.8 with AC: 6PK1842 - a 6PK1800 will work
2.0 with AC: 6PK1975 - a 6PK1930 will work
Thats right. I fitted on my 156 1.8, 1800mm instead of 1842mm OEM belt.
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