A&A Secondary Drive + Mechman alternator
 

Since I'm moved to the mechman alternator the belt is too loose and there isn't much adjustment on the tensioner on the A&A Secondary drive kit, has anyone figured out a solution other than a custom belt?

- john

Why would it be a custom belt? Just order one size down.

I've got the A&A secondary drive and a Mechman alternator. I'm using the K060365 belt with no issues. I beat on it at a roll racing event two weeks ago and it worked just fine.

Been there done that, we can't quite get it on the tensioner setup on the A&A flip drive doesn't allow for a lot of room.

How did you get it on, did you take the tensioner off then put it back on once the belt was on?

The K060365 was tight as hell on the stock alternator. I had to completely remove the alternator to get the belt on.

On the Mechman, the K060365 was actually pretty loose and slipped right over the alternator pulley, which is smaller. However, with the spring tensioner, I haven't had any belt squeal or drop in voltage at high rpms.

I seem to be in the opposite position, the stock alternator and belt supplied by A&A worked fine, too big on the Mechman, and the one down is tight as all get out..

What belts did you try? They make a TON of sizes around there, in 5mm increments. No reason you can't find a belt that fits.

https://assets.gates.com/content/dam...t-newbrand.pdf

I went the next one down which is quite a bit smaller.

K060355RPM K06 13/16” x 36 1/8” - Black 6 35.56 903 36.125 918
K060370RPM K06 13/16” x 37 5/8” - Black 6 37.13 943 37.625 957 <-- size that came with the kit.

The K060365 fits on so easily with the Mechman that I went and bought a K060360 just in case, but haven't needed to use it.

The K060370 supplied by A&A was giving me belt squeal on the stock alternator so that's why I went one size down.

Research the part number. You'll have to look beyond Gates RPM.

I mean I want to smash my face into the keyboard trying to find a size chart of belts from these places.. I mean how hard is it to index your products..

Google gates belt size. Why are you looking at RPM belts? Just run a normal.

Or google napa belt sizes. Either one gives you a huge list. They make a 365/360/355, etc etc. No reason to go down to a 355, or even consider running an RPM belt unless you like to burn money.

but, but, but...

365 belt here with billet tech alternator and a&a secondary drive and it works perfect... you don't need an rpm belt, the regular gates belt will work just fine

I've found one have to go get it tomorrow I was trying to use the same belt type and quality that was supplied in the kit. You would think they would make the same sizes in both types of belts.. guess not.

Nothing other than that's what came with the kit and I was trying to keep it with what they supplied. The RPM belt size chart is easy to find and took me 30 seconds to order one size down, which is just too tight. The normal belts when you try to filter down, it's not sorted by size and there are 100s of them, took a bit to find it but I did.

Same with any other belt size chart.

RPM belts are made for blowers and crazy applications, and have very limited selection. Zero reason to need one for alternator belt. The normal belt catalog is sorted by size, in order, so not hard to find at all.

Could have always called Napa, autozone, etc etc etc and just said you need one belt size down from a 370 or whatever.

I have belt squeal myself, cant figure it out. I changed the belt to the 65 and it got worse. Then I got a new tensioner and it still squeaks. Do you think it's the alt or power steering pulleys that could be causing the squeal? All help is appreciated.

Are you sure it's coming from that belt? Does it do it all the time or just at start up?

If it got worse with the shorter belt, I would think that's because you're putting more load on the pullies. You can try using a stethoscope to isolate which pulley.

I'm sure, I took my beating and have a better understanding of belts sizes and how they are numbered now so at least I know, thanks for the help.