Im looking into some more upgrades for the next stage of my z's N/A life. The problem is I cant find any crank pulleys that eliminate the PS and A/C belts as well. I know this is not common but i was hoping someone may have some input.
Is there a single belt crank pulley available? anyone have any leads on where i may find one? Is there any other vehicle that i could use the pulley from?
Crank pulley options
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NolimitZ32
- Posts: 7042
- Joined: Fri Jun 27, 2008 9:07 am
- Car: 91 AG2 2+0 TTMT swap/E39 BMW 540i6/E53 4.6is Dinan S3
- Location: Houston, TX
Re: Crank pulley options
Nothing OTS that I have heard of or seen, are you planning to convert to manual rack? Running a PS system without the pump is not only ridiculously difficult but also dangerous as the PS parts such as the rack need pressure to operate properly and stay lubed, you could have a seized rack on your hands if you run a PS rack without the P portion
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centralcoaster33
- Posts: 2634
- Joined: Tue Apr 05, 2005 10:41 am
- Car: 1997 Nissan 240SX #5
- Location: Central Coast, CA
Re: Crank pulley options
Well, most crank pulleys have accommodations for all belts. A good crank pulley is also a harmonic damper. ATI makes one for your engine. I looked around and found another product. A zero pully, harmonic damper. Now, the one I found seems to be used in Ford and Chevy small block engines and apparently you bolt the pulleys onto that. You could contact the company and see if they have an option for your crankshaft and engine. If so, you could then source a single pulley to bolt up to it. Even having control of the radius so you could essentially underdrive the accessory. Here are links to what I found:
https://www.summitracing.com/parts/pfs- ... fgodHPECng
https://www.z1motorsports.com/engine-pa ... -8816.html
It looks like maybe, just maybe some of the pulleys on the ATI can be unbolted and removed? I'm not sure I'm reading that correctly. It's pricey, but you are in the realm of diminishing returns when you're trying to get single digit horsepower gains by cutting parasitics like PS or underdriving an alternator. The ATI is very nice and you can see it also underdrives your stuff a bit. You could just run that and not have the other belts installed of course.
I have a 240sx and looked into this a bit. The order of the belts was important because of the offset from the face of the engine to the accessory. I found that the most important thing was harmonic damping. I had an unorthodox underdrive pulley and chose to go back to the OEM one (I'm not ready for the ATI pulley as that is far down the list of ROI for upgrades). I recall finding a two pulley crank, but it wasn't what I got. I think it was a Canadian non-ac version. I'm not sure that the Z had non-ac versions, but if so, then there is likely a two pulley version for you.
Also, it is not uncommon to delete the PS system in a 240sx, but as NolimitZ32 mentions, you don't use the PS rack, you get a manual rack. I'm not sure one exists for your car like they do for 240s. You'd want to figure that out before tossing your pump and hoses.
Wait a second... don't you need at least two pulleys for two belts? I'm thinking of alternator and water pump. Hmm, I can't find a single good photo of your engine with belts showing (all show the dang timing belt), but one maybe shows the alt and water on the same belt. Cool!
https://www.summitracing.com/parts/pfs- ... fgodHPECng
https://www.z1motorsports.com/engine-pa ... -8816.html
It looks like maybe, just maybe some of the pulleys on the ATI can be unbolted and removed? I'm not sure I'm reading that correctly. It's pricey, but you are in the realm of diminishing returns when you're trying to get single digit horsepower gains by cutting parasitics like PS or underdriving an alternator. The ATI is very nice and you can see it also underdrives your stuff a bit. You could just run that and not have the other belts installed of course.
I have a 240sx and looked into this a bit. The order of the belts was important because of the offset from the face of the engine to the accessory. I found that the most important thing was harmonic damping. I had an unorthodox underdrive pulley and chose to go back to the OEM one (I'm not ready for the ATI pulley as that is far down the list of ROI for upgrades). I recall finding a two pulley crank, but it wasn't what I got. I think it was a Canadian non-ac version. I'm not sure that the Z had non-ac versions, but if so, then there is likely a two pulley version for you.
Also, it is not uncommon to delete the PS system in a 240sx, but as NolimitZ32 mentions, you don't use the PS rack, you get a manual rack. I'm not sure one exists for your car like they do for 240s. You'd want to figure that out before tossing your pump and hoses.
Wait a second... don't you need at least two pulleys for two belts? I'm thinking of alternator and water pump. Hmm, I can't find a single good photo of your engine with belts showing (all show the dang timing belt), but one maybe shows the alt and water on the same belt. Cool!
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DCaff300ZX
- Posts: 4202
- Joined: Sun Jun 14, 2009 8:18 am
- Car: .
1993 CRP TT- Modified - Location: Tacoma, Washington
Re: Crank pulley options
Agree with this, especially the later comments regarding diminishing (non-existent?) returns on an NA that isn't like super-built...and even then...maybe 2-3 HP you can't even feel, and really means nothing unless in some super-restrictive bracket drag racing scenario?NolimitZ32 wrote:Nothing OTS that I have heard of or seen, are you planning to convert to manual rack? Running a PS system without the pump is not only ridiculously difficult but also dangerous as the PS parts such as the rack need pressure to operate properly and stay lubed, you could have a seized rack on your hands if you run a PS rack without the P portion
Careless "modding" activity like this leads to a car that becomes unreliable and inconsistent, and even dangerous in some cases as mentioned by NoLimit when the mods are not used/installed correctly, are unnecessary, and/or are inferior quality to the OEM pieces and focused on looks or being cool instead...OP, be careful with this line of thinking!
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budget300zx
- Posts: 199
- Joined: Thu May 29, 2014 9:11 pm
- Car: 90 300zx NA
Re: Crank pulley options
to clear things up....
i plan on going turbo and also have no intentions of ever selling the car or getting any of the amount ive put in it. Im looking at mods that will be easy to do with the engine out that i wont have to redo when i decide to add some type of turbo system(undecided-single, twin, compound or sequential). I'm working on a tt block now and already have my fresh PnP tt heads.
I also have a modified P/S rack that has been grease packed and i will maintenance and re-grease regularly. my pump had separated from the pulley/shaft and my lines were leaking. i may go back but i have been happy with the results after the rack modifications.
the water pump and alt operate on the same belt. its the first belt grove closest to the engine. im also tired of looking at the other belt groves getting coated in rust/corrosion.
I may end up calling ATI and see what they could do, but i was hoping not to spend more than a couple hundred definitly not $500+
i have not found any other single belt pulley sharing a 25mm snout as of now either. So there may not be a possibility of this other than ATI or custom machining.
I have a few spare stock pulleys and may just try and cut or separate the outer pulleys and see if it destroys, puts it out of balance, or damages the dampening material. my other option is purchasing a lightweight underdrive pulley and having a machine shop mill it down and also balance it.
also an engine bay pic since my last photo host kicked me for view request limits.
i plan on going turbo and also have no intentions of ever selling the car or getting any of the amount ive put in it. Im looking at mods that will be easy to do with the engine out that i wont have to redo when i decide to add some type of turbo system(undecided-single, twin, compound or sequential). I'm working on a tt block now and already have my fresh PnP tt heads.
I also have a modified P/S rack that has been grease packed and i will maintenance and re-grease regularly. my pump had separated from the pulley/shaft and my lines were leaking. i may go back but i have been happy with the results after the rack modifications.
the water pump and alt operate on the same belt. its the first belt grove closest to the engine. im also tired of looking at the other belt groves getting coated in rust/corrosion.
I may end up calling ATI and see what they could do, but i was hoping not to spend more than a couple hundred definitly not $500+
i have not found any other single belt pulley sharing a 25mm snout as of now either. So there may not be a possibility of this other than ATI or custom machining.
I have a few spare stock pulleys and may just try and cut or separate the outer pulleys and see if it destroys, puts it out of balance, or damages the dampening material. my other option is purchasing a lightweight underdrive pulley and having a machine shop mill it down and also balance it.
also an engine bay pic since my last photo host kicked me for view request limits.