Plain Jane OEM nothing to see here rebuild

JustJeff · 10-09-2010, 10:20 AM

^thanks for the heads up Ted, from what I had read so far I thought I could use just the gears and didn't need any other modifications other than extending the e-shaft jet grooves.

This is why I created the thread, in case I miss something. I'll be sure to reread the info I had found before doing anything. If there is any doubt I'll keep the stat gears I already have. I'm not building a high rev, high output engine so I really don't need the hardened stat gears.

One question, are the Cosmo 13B-RE gears a direct swap? I'm still researching that one, but had been told they are hardened but a direct swap...but they also do NOT have the better bearings that the FD and RX-8 have.

Just to complete the conversation for anyone who is searching for related info. I had read conflicting info about using RX8 gears. Some said they are a direct swap and other said you need to shave off like .001 on 13B e-shaft to accommodate the gear.

RETed · 10-09-2010, 12:16 PM

Quote:

Originally Posted by JustJeff

One question, are the Cosmo 13B-RE gears a direct swap? I'm still researching that one, but had been told they are hardened but a direct swap...but they also do NOT have the better bearings that the FD and RX-8 have.

I can't confirm on the Cosmo stat gears...

The Cosmo (20B only?) runs a 3-window bearing on the stat gears.
The 3 windows are slotted.
Mazda Comp (now Mazdaspeed) used to sell them as "Mazda competition bearings" back in the day.
The FD3S 13B-REW runs a 9-window bearing - 9 drilled holes throughout the stat gear bearing.
It's arguable whether which is better, but the 13B-REW ones are the newest design and therefore arguably better.

Quote:

Just to complete the conversation for anyone who is searching for related info. I had read conflicting info about using RX8 gears. Some said they are a direct swap and other said you need to shave off like .001 on 13B e-shaft to accommodate the gear.

Sorry, I can't confirm either.
I don't mess with RX-8 stuff.
For me, the RX-8 wasn't turbo'd so why try and use "NA" parts in our turbo'd application?

-Ted

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10-09-2010, 10:20 AM	#1
JustJeff RCC Contributor Join Date: Mar 2008 Posts: 505 Rep Power: 18	^thanks for the heads up Ted, from what I had read so far I thought I could use just the gears and didn't need any other modifications other than extending the e-shaft jet grooves. This is why I created the thread, in case I miss something. I'll be sure to reread the info I had found before doing anything. If there is any doubt I'll keep the stat gears I already have. I'm not building a high rev, high output engine so I really don't need the hardened stat gears. One question, are the Cosmo 13B-RE gears a direct swap? I'm still researching that one, but had been told they are hardened but a direct swap...but they also do NOT have the better bearings that the FD and RX-8 have. Just to complete the conversation for anyone who is searching for related info. I had read conflicting info about using RX8 gears. Some said they are a direct swap and other said you need to shave off like .001 on 13B e-shaft to accommodate the gear.