knonfs

Fellas,



What does RB means by their "Modified Stationary Gears and Windowed bearings"? I can call them and ask, but since I am not buying them, I figure it would be rude to waste their time just because I am ignorant on the subject



I know that some OEM stat gears have been hardened from the factory and aprently some others aren't. I originally thought that all 89 and up were hardened from the factory, but after using the search function, I noticed that some of the respected builders here have found this not to be the case.



On any case, how else can you modify a stationary gear? What does RB means by stage I, stage II stationary gears?



I believe that the "windowed bearings" means more than one hole (for the incoming oil, correct?) or an extended \larger one...



I need help, as these questions are killing me

boogerboy

i believe that the rx8's are the only ones that are hardened.



feel free to correct me though,

13BTNOS

Go on their website http://www.racingbeat.com/FRmazda2.htm look under engine internals and it explains exactly what they are. You should request a catalop/technical manual from them, it has a lot of helpful information on building engines. Also 13brew 1993 and up are also hardened from the factory and have multi-holes on them and a set screw to lock the bearings in.

knonfs

Yup, I have read their description which is:



"These gears have had several machining modifications performed, as well as heat-treating of the teeth to improve fatigue resistance and yield strength. The front gear and the standard-ungrooved rear gear have the stock bearing installed. The “special grooved” rear gear includes a three-window bearing"



My questions are:



1 - What constitutes "several machining modifications"?



2 - What does [“special grooved” rear gear] means?



I am a picture guy, however I don't think those explanations do a good job at explaining the "mods" done to the gears; at least for those of us that have never seen what they are talking about.

C. Ludwig

The stock FC and earlier gears/bearings have a single oil port and a shallow groove in the bearing to allow oil to flow around the circumference of the bearing between the it and the e-shaft. The multi-window bearings (FD and 8 as well as the 3-window race bearing) have multiple ports around the circumference of the bearing. In order for oil to migrate from the oil feed port to the other windows in the bearing there is a groove cut in the gear behind the bearing. In this setup oil is not just moved in from the single port but from the entire circumference of the bearing providing better support for the e-shaft from all sides.



In order to use the later bearings (FD/8 or 3-window race) with the FC and earlier gears you need to cut this groove in the bearing so that oil can flow around the outside of the bearing.



As far as heat treating and when it began some say 89+ others say 93+.



And if you're considering the RB gears, save yourself a bunch of money and just get the 8 gears. Much cheaper and they have all the good stuff included.

knonfs

Please tell me more about this "groove cut in the gear behind the bearing", when you say behind, do you mean between the bearing and the gear? or on the gear itself, right before the bearing (closest to the "flange" that meets\bolts to the side housing?)



I can't picture that one







Are they a bolt in affair to the FC engine? (other than: "If using the RX8 rear gear in an earlier 13b engine, you must add sealant where the rear gear o-ring WOULD be. There is no groove to hold the o-ring because the Renesis engine mounts the o-ring in the side housing rather than on the gear.")



Thanks for all of your help, I really appreciate the time and patience

C. Ludwig

I've got a couple FD gears out getting new bearings pressed in them. When I get them back I'll take some pics of them next to an FC gear to attempt to show the difference.

knonfs

Thank you sir!

C. Ludwig

Not the best pic but you can see the groove cut in the bearing. All bearings have this. On the single window bearings this is the only means for the oil to circulate around the circumference. With the single port bearing there is less support around the circumference. To make the multi-window bearings work there is another groove cut in the gear directly behind the windows (yellow arrows) so that oil circulates behind the bearings and can be pushed in at multiple points around the circumference of the bearing. This provides superior support for the e-shaft around the entire circumference of the bearing.



The FC and earlier gears do not have this groove cut in them. Using a later multi-window bearing in those gears (without modifying the gear by cutting the groove into the gear) is a bit of a waste. That's one of the modifications RB does.



Again, if you're looking for the best of the best, just get the 8 gears/bearings. They have all the lastest tricks.

knonfs

Man you ARE the man!



I got it now



Thanks for all of your help