Ok, So I hear that using 8 gears in my 13B S5 ITS is a good way to go. So I called up MazdaMotorSports and they tell me there are two listings for each with a manual trans. I asked what the difference was between the choices and they did not know, do any of you fine folks. Here are the listings"

Front Stationary Gear:
KING B - N3H3-10-E0YB, $75.60
KING A- N3H3-10-E00B, $89.40

Rear Stationary Gear:
KING B - N3H3-10-E1YB, $97.25
KING A - N3H3-10-E10B, $115.95

i dont know what the S vrs B thing is about either, the cataloge lists not explanation for this, or atleast I couldnt find one.


thanks for the help!!!

 

Mazdatrix lists the numbers as "low power" and "high power". I would assume there is a bit more clearance in the high power bearing though I've never used or measured the low power version. The high power bearing is cheaper too.

http://www.mazdatrix.com/8engine2.htm

 

auto and manual?

 

I've heard it described like that also.

 

no its not the high/ low power issue, that realtes to manual or automatic trans. There are three listings, two for the manul that are both "High power", meaning that they are just hardedned. But the differance between the two........?

 

you are aware that this too is illegal in IT right?

 

i dunnoo about the legality of it, but the oil passage doesn't line up. you gotta pull it rearward with the dremel.

i'll see if i can dig some pics up.

 

The listings of parts numbers above is for hardend, manual trans gears, there are 4 numbers. What is the difference between the two sets of 2? Anyone.....Ludwig??

 

there are 3 numbers:

rear

N3H1-10-E10C a/t std power

N3H3-10-E10C high power marking O

N3H3-10-E1YC high power marking y

fronts the same but the numbers are e00c and e0yc

i could look, but i dont remember seeing that refered to anywhere...

 

i got the numbers from the mazda factory parts book. The mazdamotorsports fella told me he didnt know why there were two listings for manual gear sets. The mazda gentleman confirmed the listings also.....so I dont know what the deal with that is

 

Dave's right about the rear gear hole not lining up perfectly. You need to pull it back about .060".

Since Mazdaspeed couldn't answer your question and Mazdatrix at least ackowledges the different part numbers I called them. I talked to Kyle and he said it has to do with bearing clearance. Just like the FD bearings are available in sizes so are the Renesis bearings. What they call the "high power" bearing is supposed to have the largest clearance. I never knew there were multiple part numbers until you brought it up but have always used N3H3-10-E1YC. He said there is no difference at all in the composition of the gear itself. In the interest of parts commomality alone that makes sense to me.

 

no suprise you came through. i had thought of calling mazdatrix but since i have never bought or know them as you do i didnt want to be the guy who pumps them for info and doesnt buy.... So from the part numbers i supplied howcome there is such a difference in price if it is only the clearance on the bearing? As those are the only part numbers listed on the parts book does that mean there are only two different size bearings? I just double checked the parts book, my numbers are correct, per the 2004 catalog. The numbers are manual trans numbers only, i didnt include the one number for an auto. Howcome the manual has two different numbers but the auto does not if this is a bearing size issue??? I will call mazda with the info we have and see if i can talk to someone different. Man, I sure am confused, i triple checked the numbers and, ludwig, i cant find your E1YC number? What am i missing here?

 

Dunno...

My take is that even if there are a couple different numbers I'm confident that the gear itself is the same across the board. All we're after here is the treated gear which has been standard for a number of years anyway. The 8 gear just happens to be less expensive than the alternative. Any other differences would then fall on the bearing. All the bearings are measured for fit anyway and if clearnacing is needed we do it. I'm not too worried about a radical difference between the part numbers. But I could be wrong...

 

FWIW I just measured a new set of 8 bearings against an FC eshaft that are being used for an ITS engine. Thought I'd post the results while it's fresh in my mind. The gears used are part number N3H3-10-E0YC front and N3H3-10-E1YC rear.

Front main bearing measured out at 1.6940" at 3 spots on both the front and rear land.
Front main journal measured out at 1.6920" at 3 spots on both the front and rear land.

.0020" clearance at all points on the front main.

Rear main bearing measured out at 1.6945" at 3 spots on the front land.
Rear main bearing measured out at 1.6950" at 3 spots on the rear land.
Rear main journal measured out at 1.6920" at 3 spots on the front and rear land.

.0025" clearance at the front land.
.0030" clearnace at the rear land.

Take that FWIW, your mileage may vary.

 

could this stationary gears be used on a s-5 engine ? the reason I ask is because I'm trying to find what would be my best choice to suit my drag racing engine .

Thanks in advance
Gilbert

 

Yes they work just fine. Take note of the above discussion on aligning the oil galleys and sealing of the rear gear to the iron.

 

which on you recommend between the fd and the rx8 for a s5 drag motor at around 35 psi

 

The best we can tell from the one's we've used are that the FD and RX-8 gears are the virtually identical. The only significant difference being cost. I haven't used them in anything but street engines but I wouldn't be afraid to use them instead of an FD gear.

 

I agree with what's been said here.

The bridgeported 13B in the car I've been driving this season runs RX-8 gears. My buddy/engine builder tells me the only difference in the part numbers is the clearances. We run the "race" gears which merely have greater bearing clearance.

I don't know the part numbers off the top of my head but you can buy bearings straight from Mazda with a number of different clearances. Typically we buy the cheapest "stock" bearings and clearance them ourselves since they are so much cheaper.

 

They are really good, i have used them on my Drag racing ALL MOTOR P-Port for 12,000rpm Revs and been using them with no problem.

The costs is way cheaper than the 93 but effective with or without turbo.

 

I want to take the time to thank each and everyone of you guy's for the input and opinios , I appreciate everyones time

Thank you
Gilbert

 

I ended up going with the Rx8 gears and like you guys said they are identical other than the oil galley hole and the oil ring it on the rear steel , but my engine builder milled the oil galley port and he lathe the groove for the oil ring