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The movement of the rear axle may not be due to insufficient strength of the retainer plate. I have had the problem even with home-made 3/8" thick (or thereabouts) retainer plates. In my case the retaining collar holding the bearing in place slipped allowing the bearing to slide back and forth on the axle (and thus allowing the axle to slide in and out). I now use Loctite 680 retaining compound on the retaining collar whenever I have to install a new bearing. Haven't had issues since. The axle movement now seems to always be 1mm or less.
Interestingly I don't seem to remember having a problem with pad kickback at the time, but maybe I just don't remember. I assume that sliding calipers would have less (altho maybe not noticeable) pad kickback than fixed calipers with the moving axle shaft.
How did your race go in Thunderhill? It looked like your team and my buddy's (Leftover Parts Racing) were pretty close for quite a while on Sunday, despite them losing a clutch on Saturday. Then later on Sunday, it looked like you guys started falling behind. I am assuming some mechanical issues for you guys?
The movement of the rear axle may not be due to insufficient strength of the retainer plate. I have had the problem even with home-made 3/8" thick (or thereabouts) retainer plates. In my case the retaining collar holding the bearing in place slipped allowing the bearing to slide back and forth on the axle (and thus allowing the axle to slide in and out). I now use Loctite 680 retaining compound on the retaining collar whenever I have to install a new bearing. Haven't had issues since. The axle movement now seems to always be 1mm or less.
Interestingly I don't seem to remember having a problem with pad kickback at the time, but maybe I just don't remember. I assume that sliding calipers would have less (altho maybe not noticeable) pad kickback than fixed calipers with the moving axle shaft.
How did your race go in Thunderhill? It looked like your team and my buddy's (Leftover Parts Racing) were pretty close for quite a while on Sunday, despite them losing a clutch on Saturday. Then later on Sunday, it looked like you guys started falling behind. I am assuming some mechanical issues for you guys?
Happy Thanksgiving
Carl
Carl,
The race was good in parts and not so good in parts. Had our undertray come loose in the first hour Saturday taking us out of podium contention, then a misreported contact giving us a black flag penalty, then I got hit by a BMW and self reported contact but they didn't see it...the Sunday we had a watts linkage failure. Fixed that and a few laps later the bolts holding the front caliper on sheered and sent the caliper bouncing between the rotor snd the wheel. The rotor machined a channel in the caliper sll the way to the fluid passage so we were done at that point. The brakes were awesome up to that point. We ended up installing 10psi residual check valves in each circuit to counter the knockback.
Oh...and our axle movement is definitely the bearing moving on the housing and not the axle moving in the bearing. I made some shims to shore it up and that eliminated 90%. Now I just need to make the plates I saw in the thread talking about this issue.
Sounds like there was definitely some bad luck involved in the weekend. From what I could tell, there was a lot of contact in the race. Pretty glad I didn't go. I hope to get up to Portland to race in 2023.
Sounds like there was definitely some bad luck involved in the weekend. From what I could tell, there was a lot of contact in the race. Pretty glad I didn't go. I hope to get up to Portland to race in 2023.
Carl
Actually the race was very low contact. Very few yellows, no red flags or black flag alls. Thecwinning cars Actually made the 1000 miles just before time was up. I think that's the first time. Can't wait 'till next year.
Well I actually worked on my car. One of the things I noticed on the video from Indy is that oil pressure was dropping in right hand turns. Oil pressure would return fairly quickly once the car straightened out even with high RPMs. So, I think the issue is oil moving away from the pickup. My fix is to add baffles to the left and right of the oil pickup with trap doors. A baffle designed to keep the oil from sloshing to the rear of the pan. Also a bolt in baffle to help keep the oil contained on the back side of each baffle.
I sourced the trap door baffles from a Speedway Motors kit: https://www.speedwaymotors.com/Small...-Kit,3512.html that amazing costs the same today as it did last century! The trap doors allow oil to flow to the pickup but not away from it. The baffles are not completely sealed but should do a good slowing oil movement down.
Going to make any of the Majors this year? That Ozark track looks pretty nice.
No, doing the Mustang autox thing again this year. The 50th Solo II Nationals is this year and I would like to attend. BTW, Charlie Clark of KC Raceware fame has been to all of them.
For the RX7, there is a vintage event in October at Lake Garnett - https://www.lggpr.org - that I would like to go to. So working towards that right now. As far as road racing in general, I am having trouble justifying the cost of tires. The "fun vs expense" math may have stopped making sense.
Starting the prep for a Vintage race next month so working on the car again. Compared to the 2017 Mustang I have been wrenching on all summer, the RX7 is a tiny. Little nuts and bolts and nothing is all that hard to do. I missed it!!
Starting the prep for a Vintage race next month so working on the car again. Compared to the 2017 Mustang I have been wrenching on all summer, the RX7 is a tiny. Little nuts and bolts and nothing is all that hard to do. I missed it!!
Gald to hear your back at it. Missing the updates and ideas we can steal...
Sorry, not really a Vintage race or Sanctioning body deal. Its the Lake Garnett Grand Prix Revival (https://www.lggpr.org/). I am running as a part of the Modern Race Car Exhibition group. No speed restrictions but also not flagged as a race. Basically a track day with spectators on an historic venue in this area. Lots of famous racers drove there in the 50s/60s so it has been a bucket list item for me.
I have explored Vintage racing but my car never really seems to fit within anything that SVRA or similar offer. I guess my 40 year old car isn't vintage enough.
Seeing something strange with the left axle bearing. In 2021 the bearing felt rough after three race weekends where I didn't spend allot of time on track. I noticed this before the runoffs when I was changing differentials. So I changed it out and installed a new SKF bearing. Did the same on the right axle even though it wasn't that bad. Neither bearing came loose so the bearing retainers are not moving on the Moser axles.
Fast forward to this year and I pulled the axles in preparation for changing the diff again. So just like before, the left axle feels rough and right axle is fine. Just like before neither axle bearing retainer was loose on the axle. The weird part.is that I appear to be killing left axle bearings. The other weird part is that after the bad left hand bearing is removed, it feels like a new bearing. .
Both axles install in the housing fairly easily but I do have to use a rubber mallet to get the left axle to seat. Nothing too extreme but a few hits are needed. Guessing that axle housing might be a little off on the left side.
Interesting. If it's worth the effort, I wonder if you reinstall it would it go back to feeling rough or stay smooth until it's run... I'm thinking maybe somehow the inner race is creating some kind of side pre-load after running a bit. Do you tack weld the retainer in place?
11-26-22, 04:39 PM
