S/C pulley?
Forum Regular
Joined: Oct 2014
Posts: 530
Likes: 1
From: Florida
Re: S/C pulley?
Carrs machine shop in Pa. Quick turn around and a 67 should not need a tune and make decent power. Rob from Needswings says his 178mm crank pulley does not need a tune and he should know. Let me search for the address for carrs Thanks go to Jefasold, not me.Tim Carr
c/o Car'rs Machine
332 Dahl Road
Bloomsburg, Pa.
17815
mail the stock pulley USPS for $5.95, now I need to fond a phone number!(570) 784-7490
Contact them first and make arrangements. I believe 67mm is the smallest they can go and give the grooves the stock depth. If you contact the guy in Poland tell him we are friends, my last name is Swietoniowski, aka, Sweet!LOL
c/o Car'rs Machine
332 Dahl Road
Bloomsburg, Pa.
17815
mail the stock pulley USPS for $5.95, now I need to fond a phone number!(570) 784-7490
Contact them first and make arrangements. I believe 67mm is the smallest they can go and give the grooves the stock depth. If you contact the guy in Poland tell him we are friends, my last name is Swietoniowski, aka, Sweet!LOL
Last edited by Sweet2002; 08-23-2015 at 07:30 AM.
Senior Member
Joined: Apr 2006
Posts: 25,429
Likes: 613
From: Ontario
Re: S/C pulley?
I would hazard the opinion that 67 mm is too small and would one day fracture due to the stresses.
Pulley diameter (67) minus twice the groove depth (.140) minus the bearing outside diameter (55), all divided by two equals the wall thickness remaining.
Thus;
[Ø2.638 –(2 x .140) – Ø2.165] ÷ 2 = .096 wall thickness.
The weak point will be the sharpish corners inside the pulley bore.
I would feel safer with a pulley modified to 69mm which would increase the wall thickness by an extra .040 to .136.
Pulley diameter (67) minus twice the groove depth (.140) minus the bearing outside diameter (55), all divided by two equals the wall thickness remaining.
Thus;
[Ø2.638 –(2 x .140) – Ø2.165] ÷ 2 = .096 wall thickness.
The weak point will be the sharpish corners inside the pulley bore.
I would feel safer with a pulley modified to 69mm which would increase the wall thickness by an extra .040 to .136.
Joined: May 2015
Posts: 66
Likes: 0
From: Colorado Springs
Re: S/C pulley?
Works great but I need more cooling. I put a Johnson pump in and that helped but still need more wired it to run all the time but it set codes in the dash. when it runs it really runs now. what I did do to the car is change the springs to performance standard crossfire springs the ride is fantastic and the handling seems the same ( springs are HK off ebay) I also took the back panels out and insulated the side floor and back of seat panel big difference in noise now.
Forum Regular
Joined: Oct 2014
Posts: 530
Likes: 1
From: Florida
Re: S/C pulley?
I read somewhere where 67 was the safest small size to go but cannot source it tonight. say split that nat 68mm and it is still a good deal. The EC aluminum pulleys are said to fail within a year of normal diving themselves though I took a chance and got one. Went with the 70mm from Carrs to go with my 178 crank pulley which is just about the same as a 62mm SC pulley.
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)