Each new 13B-REW is handbuilt by a single engineer
10-03-22, 09:26 AM
#28
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(there aren't as many ships, the ports were backed up, then there have been trucker strikes, etc etc etc, basically things go ok, until they unload in the US, and then disaster)
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Narfle (10-04-22)
10-04-22, 10:46 AM
#31
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10-04-22, 12:12 PM
#34
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i think its this, https://www.enjautoworks.com/product...aring-support/
10-04-22, 01:59 PM
#35
I see.
That looks to try and contrlo radial movement/whip of the eccentric shaft to limit bearing wear on the outside shoulders of the stat gear bearing. Much like how Mazda made the tapered rear journal on the RX-8 e-shaft and how racers have been flapping stat gear bearings for decades for increased clearance at the outer edges.
The thrust assembly is for axial loads
They are related of course as eccentric shaft whip reduces the thrust bearing clearance (hence more clearance for high rpm engine).
That looks to try and contrlo radial movement/whip of the eccentric shaft to limit bearing wear on the outside shoulders of the stat gear bearing. Much like how Mazda made the tapered rear journal on the RX-8 e-shaft and how racers have been flapping stat gear bearings for decades for increased clearance at the outer edges.
The thrust assembly is for axial loads
They are related of course as eccentric shaft whip reduces the thrust bearing clearance (hence more clearance for high rpm engine).
10-04-22, 02:20 PM
#36
We recently got a shipment in of motors that we ordered 9.5 months ago. I'm unsure if the wait times are still that high, but I wouldn't be surprised. If you're looking to buy a new crate motor, we have got 1 left, ready to ship out! If you're interested, feel free to shoot us an email at info@sakebombgarage.com and we can get you sorted out.
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SAKEBOMB GARAGE LLC
www.SAKEBOMBGARAGE.com
Specialty aftermarket parts & service // Fremont, California
Contact: info@sakebombgarage.com
10-04-22, 06:48 PM
#38
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I have one. My motor is being built at REC. After doing some questioning Adam from REC essentially refused to put it in the motor he's building for me. At least not while also attaching his shop name to it and warranting the motor.
10-04-22, 08:40 PM
#39
The way I see it, even if it does wear I can just pop the front cover off and swap it out without ever worrying about that thrust bearing mess dropping out. Same for a leaking front seal etc., but admittedly I’m not ever going to be putting 6-figure mileage on any rotary engine either.
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10-04-22, 10:58 PM
#40
You still have to run the stock thrust washer and needle bearing stack with this E&J ball bearing eccentric shaft additional bearing.
There is no modification needed and it is a bolt on part.
The entire factory trust bearing assembly may be remove and mount our set up.
The entire factory trust bearing assembly may be remove and mount our set up.
10-05-22, 03:26 PM
#41
Thanks for posting. Cool that Mazda is supporting and drawing attention to its rotary history.
The rotary factory used to have a machine that tightened all tension bolts simultaneously so it's interesting to see the guy tightening one at a time. Wonder if that big machinery was retired as the program was scaled down or if the picture is just for press purposes.
The rotary factory used to have a machine that tightened all tension bolts simultaneously so it's interesting to see the guy tightening one at a time. Wonder if that big machinery was retired as the program was scaled down or if the picture is just for press purposes.
10-05-22, 11:29 PM
#42
in your quote, on the website, and in the website video it states that the *entire* thrust bearing assembly can be removed and they supply the one spacer needed.
Am I misunderstanding something then, because I thought that was the entire point of employing the roller bearing; it takes the fore-aft e-shaft load on the roller ***** rather than the two needle/thrust bearings with the spacers up against the inner bearing race and thus locking the e-shaft in place relative to it.
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10-06-22, 02:52 AM
#43
You still have to run the stock thrust washer and needle bearing stack with this E&J ball bearing eccentric shaft additional bearing.
Video played for me now and I see you are correct.
That is interesting...
Much less thrust load capacity than the stock thrust bearing.
More bearings in the stock assembly means each point of contact to the race carries less load against the hardened thrust washers and tapered roller bearings have superior thrust capability to ball bearings besides.
I would guess axial thrust loading was sacrificed for greater radial load control.
Probably great for the application (living a 1/4 mile at a time.)
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Howard Coleman (10-06-22)
10-06-22, 11:41 AM
#44
I struggled with it at first too because the details are sparse with gaps to be filled in using the mind’s eye.
not sure I fully agree with the assessment as it depends on the magnitude and duration of the loading along with the quality of the bearing assembly, but everyone can decide for their own situation.
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not sure I fully agree with the assessment as it depends on the magnitude and duration of the loading along with the quality of the bearing assembly, but everyone can decide for their own situation.
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10-06-22, 11:55 AM
#45
You still have to run the stock thrust washer and needle bearing stack with this E&J ball bearing eccentric shaft additional bearing.
Video played for me now and I see you are correct.
That is interesting...
Much less thrust load capacity than the stock thrust bearing.
More bearings in the stock assembly means each point of contact to the race carries less load against the hardened thrust washers and tapered roller bearings have superior thrust capability to ball bearings besides.
I would guess axial thrust loading was sacrificed for greater radial load control.
Probably great for the application (living a 1/4 mile at a time.)
Essentially. After tossing close to a dozen rx8 shafts (cheap, light, weak) from EP engines with out of spec runout in the last year or so I'd be interested in something that gives radial support closer to the nose, but I wouldn't given up axial/thrust support for it.
Last edited by dguy; 10-06-22 at 11:58 AM.
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Howard Coleman (10-11-22)
10-06-22, 01:38 PM
#46
Yes, my imagination quickly placed the stock thrust bearing assemby on the front of this E&J ball bearing piece.
It looked like would work since the ball bearing is justified rearward with a flat machined surface where the stock thrust assembly would be surrounding the front of the bearing which looks to be in the same plane as the bolt lands that hold the E&J piece to the stat gear all while maintaining what looks to be the same thickness of the stock thrust surface it replaces.
It looked like would work since the ball bearing is justified rearward with a flat machined surface where the stock thrust assembly would be surrounding the front of the bearing which looks to be in the same plane as the bolt lands that hold the E&J piece to the stat gear all while maintaining what looks to be the same thickness of the stock thrust surface it replaces.
10-06-22, 01:49 PM
#47
Essentially. After tossing close to a dozen rx8 shafts (cheap, light, weak) from EP engines with out of spec runout in the last year or so I'd be interested in something that gives radial support closer to the nose, but I wouldn't given up axial/thrust support for it.
I hope you have a channel through which you are able to share this information with Mazda Motorsports.
As these rotary Mazda parts are used increasingly more in motorsports relative to consumer use hopefully we can influence Mazda to push their suppliers to hold quality control tight or even continue to improve quality (as Mazda has done in the past with their part number supersession program.)
At the end of the day, racers would love to pay a little more for a higher quality part and if it can be used by class rules as a part # supersession that is icing on the cake.
10-06-22, 09:50 PM
#48
Originally Posted by TeamRX8
seems like most people here aren’t aware of the bolt-on aftermarket stationary roller bearing option that eliminates the entire Mazda front thrust bearing & endplay mess
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10-10-22, 12:10 PM
#50
Excellent feedback.
I hope you have a channel through which you are able to share this information with Mazda Motorsports.
As these rotary Mazda parts are used increasingly more in motorsports relative to consumer use hopefully we can influence Mazda to push their suppliers to hold quality control tight or even continue to improve quality (as Mazda has done in the past with their part number supersession program.)
At the end of the day, racers would love to pay a little more for a higher quality part and if it can be used by class rules as a part # supersession that is icing on the cake.
I hope you have a channel through which you are able to share this information with Mazda Motorsports.
As these rotary Mazda parts are used increasingly more in motorsports relative to consumer use hopefully we can influence Mazda to push their suppliers to hold quality control tight or even continue to improve quality (as Mazda has done in the past with their part number supersession program.)
At the end of the day, racers would love to pay a little more for a higher quality part and if it can be used by class rules as a part # supersession that is icing on the cake.
I'd love for them to be made more robust but honestly (and I think this is also the stance of Mazda) they're just wear items to me at this point and until they become expensive/out of production I'm inclined to treat them as such. I will, however, be hoarding and converting all my GSL-SE shafts to the proper FD taper as well as hold on to all my factory FD shafts for when even Renesis shafts are unobtainium.