Underdriven pulleys, idlers, and so on...
04-28-23, 07:05 PM
#1
Eats, Sleeps, Dreams Rotary
Thread Starter
Underdriven pulleys, idlers, and so on...
I just realized that my water pulley has been slipping like crazy, turning the back of my belt into a fine grey powder.
I will probably need to install an idler pulley kit to solve this, assuming I have clearance for one.
But I figure I should go ahead and get some underdriven pulleys while I am at it, since my stock pulleys are looking a little worse for wear (they're pretty rusty and they wobble a bit).
Who makes a good set? I have a big underdriven alternator pulley, and the PO listed an underdriven water pump pulley as a mod, but I am pretty sure it's actually stock.
Is it better to just make the eccentric shaft pulleys smaller, or the accessory pulleys bigger? I don't really want to underdrive my power steering.
I have no air pump and no AC.
I will probably need to install an idler pulley kit to solve this, assuming I have clearance for one.
But I figure I should go ahead and get some underdriven pulleys while I am at it, since my stock pulleys are looking a little worse for wear (they're pretty rusty and they wobble a bit).
Who makes a good set? I have a big underdriven alternator pulley, and the PO listed an underdriven water pump pulley as a mod, but I am pretty sure it's actually stock.
Is it better to just make the eccentric shaft pulleys smaller, or the accessory pulleys bigger? I don't really want to underdrive my power steering.
I have no air pump and no AC.
04-28-23, 08:04 PM
#2
I went with the Banzai set and it looks good quality (I haven't started the car yet - lot of other changes afoot).
I also installed the Pineapple Racing idler since I have removed the air pump now.
If you go that route let me know and i will look up the belt lengths for those sets.
The air conditioning/power steering pump side idler seemed OK but given some people mentioned issues with that one i pulled it and it makes a bit of noise so replaced it with a new stock one from Atkins. The new one spins noticeably smoother. I may press the bearing out and replace it with a Timken one (I really like that brand - used a bunch of theirs when i rebuilt the front end of the Land-Rover). In which case I could have used my old one. Oh well. If you need the Timken part number, let me know too.
I also installed the Pineapple Racing idler since I have removed the air pump now.
If you go that route let me know and i will look up the belt lengths for those sets.
The air conditioning/power steering pump side idler seemed OK but given some people mentioned issues with that one i pulled it and it makes a bit of noise so replaced it with a new stock one from Atkins. The new one spins noticeably smoother. I may press the bearing out and replace it with a Timken one (I really like that brand - used a bunch of theirs when i rebuilt the front end of the Land-Rover). In which case I could have used my old one. Oh well. If you need the Timken part number, let me know too.
The following users liked this post:
Valkyrie (04-29-23)
04-30-23, 02:01 AM
#3
Eats, Sleeps, Dreams Rotary
Thread Starter
I went with the Banzai set and it looks good quality (I haven't started the car yet - lot of other changes afoot).
I also installed the Pineapple Racing idler since I have removed the air pump now.
If you go that route let me know and i will look up the belt lengths for those sets.
The air conditioning/power steering pump side idler seemed OK but given some people mentioned issues with that one i pulled it and it makes a bit of noise so replaced it with a new stock one from Atkins. The new one spins noticeably smoother. I may press the bearing out and replace it with a Timken one (I really like that brand - used a bunch of theirs when i rebuilt the front end of the Land-Rover). In which case I could have used my old one. Oh well. If you need the Timken part number, let me know too.
I also installed the Pineapple Racing idler since I have removed the air pump now.
If you go that route let me know and i will look up the belt lengths for those sets.
The air conditioning/power steering pump side idler seemed OK but given some people mentioned issues with that one i pulled it and it makes a bit of noise so replaced it with a new stock one from Atkins. The new one spins noticeably smoother. I may press the bearing out and replace it with a Timken one (I really like that brand - used a bunch of theirs when i rebuilt the front end of the Land-Rover). In which case I could have used my old one. Oh well. If you need the Timken part number, let me know too.
04-30-23, 11:06 AM
#5
For aftermarket pulleys we default to banzai. Theres no reason to use anything else unless you're looking to burn money. The big turbo pineapple idler is also our default. The ps pulley issue people talk about we have yet to encounter and we've installed quite a few of them. Maybe we've just been lucky. Banzai lists the belt dimensions on their website for whatever configuration you have and will also sell them. Pineapple does the same when buying their idler.
As far s performance goes, we have noticed no difference using them vs stock. We get them primarily for dress up. If there is supposed to be a change in something from using them then we have yet to see it. They do look good though 😎
As far s performance goes, we have noticed no difference using them vs stock. We get them primarily for dress up. If there is supposed to be a change in something from using them then we have yet to see it. They do look good though 😎
04-30-23, 11:33 AM
#6
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,841
Received 2,605 Likes
on
1,848 Posts
there has been some recent discussion about water pump cavitation and such. Racing Beat says with the stock 1.22 belt ratio (water pump to E shaft), cavitation happens at 7000rpm.
so if you're say a track car, and are up near that RPM a lot, it would be a good idea to slow the water pump down/move the cavitation speed up.
so if you're say a track car, and are up near that RPM a lot, it would be a good idea to slow the water pump down/move the cavitation speed up.
04-30-23, 04:29 PM
#7
Eats, Sleeps, Dreams Rotary
Thread Starter
there has been some recent discussion about water pump cavitation and such. Racing Beat says with the stock 1.22 belt ratio (water pump to E shaft), cavitation happens at 7000rpm.
so if you're say a track car, and are up near that RPM a lot, it would be a good idea to slow the water pump down/move the cavitation speed up.
so if you're say a track car, and are up near that RPM a lot, it would be a good idea to slow the water pump down/move the cavitation speed up.
Trending Topics
04-30-23, 04:31 PM
#8
Eats, Sleeps, Dreams Rotary
Thread Starter
For aftermarket pulleys we default to banzai. Theres no reason to use anything else unless you're looking to burn money. The big turbo pineapple idler is also our default. The ps pulley issue people talk about we have yet to encounter and we've installed quite a few of them. Maybe we've just been lucky. Banzai lists the belt dimensions on their website for whatever configuration you have and will also sell them. Pineapple does the same when buying their idler.
As far s performance goes, we have noticed no difference using them vs stock. We get them primarily for dress up. If there is supposed to be a change in something from using them then we have yet to see it. They do look good though 😎
As far s performance goes, we have noticed no difference using them vs stock. We get them primarily for dress up. If there is supposed to be a change in something from using them then we have yet to see it. They do look good though 😎
Yeah, there’s no way the original design would clear my swirl pot. Gonna need to check on shipping…
05-01-23, 03:12 AM
#10
Eats, Sleeps, Dreams Rotary
Thread Starter
I am just gonna but some used Greddy pulleys, since they’ve got an anti-slip design and cost less than the shipping on the Banzai pulleys. My friend attests that they don’t slip.
05-01-23, 03:44 AM
#11
The Greddy pulley was always just a pretty bandaid for removing the air pump. It increases belt contact just to the bare minimum and many end up over-tightening the belt to avoid slipping, and shortening the life-span if the water pump. Get an air pump-delete pulley. Pineapple Racing, FFE, Banzai or the Garfinkle that was mentioned earlier. And don’t even think about a dress-up under drive pulley set without one.
05-01-23, 04:05 AM
#12
Eats, Sleeps, Dreams Rotary
Thread Starter
The Greddy pulley was always just a pretty bandaid for removing the air pump. It increases belt contact just to the bare minimum and many end up over-tightening the belt to avoid slipping, and shortening the life-span if the water pump. Get an air pump-delete pulley. Pineapple Racing, FFE, Banzai or the Garfinkle that was mentioned earlier. And don’t even think about a dress-up under drive pulley set without one.
My car only does a couple hundred miles a year, if even that, so I am not too worried. The clearance between my turbo and be FFE unit will be quite close…
05-02-23, 03:35 AM
#13
You know at a glance of your recent posts asking questions for a car intended for track duty, you’re looking to cut costs on oil, coolant level sensors, roll-bars/cages, shocks and now, I fear, pulleys that are critical to cooling.
If you’re just going to buy a used Greddy pulley based on your friend’s word why did you even make this thread?
If you’re just going to buy a used Greddy pulley based on your friend’s word why did you even make this thread?
Last edited by Sgtblue; 05-02-23 at 03:42 AM.
05-02-23, 04:39 AM
#14
Eats, Sleeps, Dreams Rotary
Thread Starter
You know at a glance of your recent posts asking questions for a car intended for track duty, you’re looking to cut costs on oil, coolant level sensors, roll-bars/cages, shocks and now, I fear, pulleys that are critical to cooling.
If you’re just going to buy a used Greddy pulley based on your friend’s word why did you even make this thread?
If you’re just going to buy a used Greddy pulley based on your friend’s word why did you even make this thread?
I am the first to admit I am a cheapskate, but it’s not like I’m ignoring the advice I’m getting here. That said, my current setup apparently wasn’t a big issue for the previous owner, and I’m only noticing an issue now after like eight years of tracking the car…
05-02-23, 09:03 AM
#15
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,841
Received 2,605 Likes
on
1,848 Posts
05-03-23, 03:30 AM
#16
Eats, Sleeps, Dreams Rotary
Thread Starter
The belt survived another track day, though I brought a spare just in case. Will replace it when the pulleys come.
Thread
Thread Starter
Forum
Replies
Last Post
Broke_A_Baller
3rd Generation Specific (1993-2002)
6
05-02-23 07:38 PM