525sc pulley sizes
04-10-2019 | 08:57 PM
#1
Thread Starter
Registered
Joined: Aug 2014
Posts: 1,028
Likes: 225
From: Ohio
525sc pulley sizes
i have found someone with a selection of pulleys but they don’t know boost from the sizes.
I am adding intercoolers and want the boost to be 7-8lbs from what I understand. Is that correct or do I want more on just 93 octane? Either way what size pulley?
also with bad fuel in Bahamas, what pulley would I want to at least make stock boost with the chillers in the summer?
I am adding intercoolers and want the boost to be 7-8lbs from what I understand. Is that correct or do I want more on just 93 octane? Either way what size pulley?
also with bad fuel in Bahamas, what pulley would I want to at least make stock boost with the chillers in the summer?
04-10-2019 | 09:29 PM
#2
Registered
Joined: Apr 2006
Posts: 10,042
Likes: 712
From: Toledo Oh
you really need to find the specs on what the 177 is rated to turn. There is more to life than boost numbers.
the better your engine flows the harder you need to spin it to make the same boost, The 177 is also overdriven to begin with...
Your static compression ratio also comes into play. if you 9:1 to start with, you cant feed it the same boost as a 7:1 and expect it to not go boom.
This might help https://documents.holley.com/199r10243rev.pdf
the better your engine flows the harder you need to spin it to make the same boost, The 177 is also overdriven to begin with...
Your static compression ratio also comes into play. if you 9:1 to start with, you cant feed it the same boost as a 7:1 and expect it to not go boom.
This might help https://documents.holley.com/199r10243rev.pdf
04-10-2019 | 11:20 PM
#3
Thread Starter
Registered
Joined: Aug 2014
Posts: 1,028
Likes: 225
From: Ohio
Dude there were a ton of these out there. The ones I have are rather low hours. I want to crank the **** for a summer and rebuild in the fall before it goes south. Appreciate your input but it isn’t relevant.
Im not trying to make a thousand per motor. Just looking for pulley sizes.
Im not trying to make a thousand per motor. Just looking for pulley sizes.
Last edited by tmmii; 04-10-2019 at 11:24 PM.
04-11-2019 | 02:06 AM
#4
Charter Member # 55
Joined: Oct 2000
Posts: 20,249
Likes: 2,497
From: Omaha/LOTO
The smallest pulley's for the Merc shaft are 2.75" and make 8# of boost. The stock pulley is 3.5" and makes 5.5# of boost. This is on the stock 454/525SC.
The blower is rated at a max of 13500 rpms. With the 2.75" and stock 7" lower you are 2.5 times overdriven so at 5200rpms your blower speed is 13000 rpms.
I ran a 2.87 and made just under 8#. Change the blower lube every 25 hrs or so if you run the small pulley.
The blower is rated at a max of 13500 rpms. With the 2.75" and stock 7" lower you are 2.5 times overdriven so at 5200rpms your blower speed is 13000 rpms.
I ran a 2.87 and made just under 8#. Change the blower lube every 25 hrs or so if you run the small pulley.
04-11-2019 | 08:27 AM
#5
Thread Starter
Registered
Joined: Aug 2014
Posts: 1,028
Likes: 225
From: Ohio
The smallest pulley's for the Merc shaft are 2.75" and make 8# of boost. The stock pulley is 3.5" and makes 5.5# of boost. This is on the stock 454/525SC.
The blower is rated at a max of 13500 rpms. With the 2.75" and stock 7" lower you are 2.5 times overdriven so at 5200rpms your blower speed is 13000 rpms.
I ran a 2.87 and made just under 8#. Change the blower lube every 25 hrs or so if you run the small pulley.
The blower is rated at a max of 13500 rpms. With the 2.75" and stock 7" lower you are 2.5 times overdriven so at 5200rpms your blower speed is 13000 rpms.
I ran a 2.87 and made just under 8#. Change the blower lube every 25 hrs or so if you run the small pulley.
