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RX-7 Drive Belts (V Belt / Serpentine Belt / Fan Belt) FAQ
The intent of this thread is to make a definitive FAQ for the FD drive belts (or fan/serpentine/V belts). Interestingly, the microfiche lists each item as a V Belt
Earlier today I had an issue getting the proper fan belts for my FD at the local auto parts store. The part numbers listed in their system didn’t match the actual items. So I had to call around to other part stores and [hopefully] found the needed parts. I pick them up tomorrow. The part numbers below apply to a stock configured FD engine. I verified these part numbers against the parts microfiche from each model year. There were no difference between any sub-models such as Base, Touring, R1, or R2.
Furthermore, I spoke with Ray Crowe and he can no longer get belts from Mazda. They have been discontinued and must be locally sourced (auto parts stores).
Since there are other aftermarket options available with under drive pulleys, billet aluminum pulleys, different idler pulleys, etc… then please list the drive belts that work for that specific application. I ask that we avoid duplicate posts when listing these variations.
One final lesson about V Belt part numbers: the number before the “PK” indicates the number of ribs and the numbers after the “PK” indicates the belt length in millimeters. For example, a 5PK-1355 belt has 5 ribs and is 1,355mm long (if measured from end to end). A 6PK-xxxx would have 6 ribs.
Getting belts for an FD can be WAY trickier than you would think. If you have aftermarket pullies, idler pulley, under drive pullies, etc. it gets crazy real fast.
I recommend hanging on to an old set of belts and also making note of their sizes. The parts store almost NEVER has the right size in their computer for whatever reason.
Get a good quality belt, it makes a BIG difference. I go with Dayco or Bando if possible.
Agreed. This is the reason for this thread - to document a reference point.
To update everyone, I did find the exact replacement belts at Bap Geon. The belts were made by Bando. The other chain stores did not list the belt sizes above in their computers at all. I also went to Dayco's website to look at their specs. And their size charts had discrepancies similar to the auto parts stores!
If I could add to this, I found that with the Banzai FD Aluminum Pulley kit and a Full Function Idler pulley I needed a 990mm 5 rib belt. This maybe slightly long as I have about a 1/2" - 3/4" of adjustment left on the alternator for tension.
Are you asking a question or making a statement? Are you using the smog pump or was it deleted? I am unfamiliar with the Full Function Idler Pulley. Are you using the stock idler pulley for the A/C & P/S?
Based upon your belt configuration, you have:
1. Banzai FD Aluminum Pulley Kit
---Underdrive Eccentric
---Alt (Stock Diameter)
---W/P
---P/S
2. Full Function Idler Pulley (assume for smog pump removal)
3. Belt size: 5PK-990
Maybe a 970mm (5PK-970) belt would allow more room for adjustments?
It was a statement. No air pump thats why the FFE idler pulley. Banzai pulley kit is underdrive main, stock size alt, water pump, power steering. I did also use the Pettit racing alum. idle pulley on the 6 rib belt. That one was pretty easy to figure using the Banzai web site.
Last edited by Mike93r1; 04-10-18 at 08:10 PM.
Reason: Add to post
So i recently ordered an IR alternator, i have been told to not go with underdrive. But that is almost every kit on the market. I wanted to go with a banzai kit, but was going off of advice not to use a underdrive kit. My setup would be EWP, with a/c and p/s. Anybody have any advice on this. Im not sure if i misunderstood, maybe they meant dont use underdrive alt pulley. But with an underdrive eccentric, it has that effect on all the accessories.
Super Now makes a underdrive and standard size main pulley in anodized aluminum in several colors. I chose the standard size too with my aftermarket alternator. I bought mine from RHD Japan.
Mike
I just bought the Super Now main pulley and cheaper other pulleys from other sources. Saves some money.
Mike
ahh I see. That makes more sense. So the word is that unorthodox racing will be putting a kit out with stock diameter eccentric by early next year. I’ll be emailing them to try and confirm.
Anything with a non-removable bearing set cannot to powder coated due to the oven temps of 500 degrees for most powder coating. It will cook the grease in the bearings and they will fail quickly. The main pulley, alternator pulley, and water pump cover are OK for powder coating.
Mike
Anything with a non-removable bearing set cannot to powder coated due to the oven temps of 500 degrees for most powder coating. It will cook the grease in the bearings and they will fail quickly. The main pulley, alternator pulley, and water pump cover are OK for powder coating.
Mike
Correct! I use to run a small coating business here in japan and still do it on the side.
ill be coating eccentric, tensioner pulley for the accessory belts (have to see if I can source new bearing), I’m gonna buy a billet PS pulley and coat it, then a/c gonna blast and see if I can disassemble. Not sure yet.
I will be running ewp so no need for wp pulley.
Can anyone else offer input on this?
I'm looking to use the Pineapple racing air pump removal (which adds an idler/tensioner) with ONLY an underdriven alternator.
Can someone tell me the proper length for this? Thanks!!
(Someone should make a quick app/program for this!)
Bit of a side note, instead of creating a new thread, I figured I'd go with this. So I took the part number off this thread for the Alt/WP/AP belt and cross referenced it at Autozone, and came up with part number 4050515 for the Continental brand. Now, based on my research, Gatorback was always a great belt, due to corporate buyouts, it was rebranded Continental Elite. However, I couldn't find an Elite version in stock in any parts databases at the chain stores. I found out by looking on Continentals website, they changed all of their belts to "OE Technology Series." There was even an explanation in the documents listing the differences, one of the differences for the "new" OE Technology Series was the "ribbed pattern familiar to most technicians."
...now, I have zero technical data to go on, so call me crazy here, but to me the way the document was worded was essentially they are ditching the Gatorback/elite series because of cost and just combining everything into one style normal serpentine belt. The whole point of the Gatorback/elite series being superior to the regular belts was the fact that its pattern was distinct, correct? I can still find an actual Gatorback/elite series, so I'm wondering if I should return this continental OE Technology Series and get the Gatorback/Elite, unless they truly are just as good, despite the OE Tech series looking just like every other belt out there.
Last edited by SwappedNA; 09-13-19 at 07:22 PM.
Reason: Added information.
I recently replaced a Goodyear Gatorback that was 8+ years old with a new Continental OE Technology belt. I would have bought another Gatorback if I could find one. I've only run the new belt for a few months but it works well with no squeals so far.
04-02-18, 08:56 PM
RX-7 Drive Belts (V Belt / Serpentine Belt / Fan Belt) FAQ
