www.RX7fb.com

Thanks for that explanation aye, James. I think that along that, along with detonation causes the issue from what I believe aye.

KYPREO wrote: ↑Wed Nov 11, 2020 9:16 pm Sorry to hear about this. Yes unfortunately it is a common failure point but moreso in series 4 blocks and i think perhaps early series 5. Mazda thickened the casting in that area in later engines. But if you up the boost, the rear plate in later engines can still crack.

Pretty much everything James said.

This is now a chance to come back better and stronger than before!

Yeah I'm going to try and track down the stronger series 5 plate aye! I'm going to be running about 1 bar of boost maximum. Nothing too crazy. But enough. I was only at 12 PSI when this happened! I have already started with more mods whilst the engine is out . Thanks for the tip on the thick baffle also aye bro! Will look in to that . The o-ring is a great thing aye


Bit of a bummer aye! I have somehow managed to not get too down about this. It is giving me an opportunity to do some mods I have been wanting to do for a while now.

So I borrowed an engine crane from some mates and lifted it out in an afternoon. Threw it in the back of my mighty workhorse of a Yaris. It fit great, even with everything still attached . Then took it over to JamieR's house and got it on the engine stand




Steve-A gave me his old 54mm socket. We should all know what for. JamieR welded it to a large boxed piece of steel. My feet only just started lifting off the ground as the nut broke loose. I think it came off fairly easily due to it being freshly put together and not Mazda's godly torque they used to tighten it .



Not looking too flash here. Not sure what causes this exactly? Lightweight Exedy flywheel and clutch setup. I didn't notice any slipping when I had driven it at all . Not sure if I should get it machined or what? Opinions?




Stationary gear bearings. No major destruction there. Sump oil was clean of any glitter when I emptied it. Promising, but not getting my hopes up . The second picture looks like there is a small scratch. I haven't been back to Jamies house for a while due to lockdown. I have no idea whether this is acceptable to reuse or not? Or how it happened. Possibly on install or removal of he bearing/gear? Not sure. Any opinions are welcomed.




We took the sump off and were greeted with this inside and over the oil pickup mesh/filter stuff. Jamie and I were pretty worried at first glance! . Upon closer inspection is was excess silicone from the build, which had fallen off the joins when sandwiched together and the sump gasket. But there was also some solid material in there! We cleaned it off to figure out what it was. We came to the conclusion that the bottom of the plates had flaked off some loose material and fallen in to the sump. Promising, but not getting my hopes up .




Removed the rear plate to assess any initial damage. We had a good look around, without spinning the engine. It all looks pretty damn shiney and smooth in there! I believe Era used SCR Power seals aye. Looking through the exhaust ports earlier on - they seemed sweet as! Debating if its worth completely stripping the block down and rebuilding it now. Cleaning out all the passages where silicone/plates flaking may have been sucked up the oil pickup? Or do I just grab a new plate and throw it on?




Even the face of the rear plate looks pretty sweet at first glance when we took it off. Looks like a few dots on it and some circular mark. No idea what they are . The cracking on the other hand




That is as far as I have gotten with the engine. I have started a few other mods which I will post up when the time comes. I'm not in any particular rush to rebuild it. Get it done properly aye!

Good luck Jesse!
I am so sorry about the engine fault. Perhaps a race stud kit will help too. BTW i take the slightly higher racing beat torque for the stud.


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Found these 32 foot-pounds advice from racing beat, hope it helps Jesse.

I suspect your eshaft has contacted the rear stat bearing as the rear plate has “walked” when the dowel locating was lost.
I’d change that rear star for sure.

Check the eshaft journal too.

The rest of it should be useable. Just check wear.
I would change all springs on the rotor if it has overheated too.

I have some and some S5 plates if you’re still looking.

Good luck dude.

Got that engine back together and FC subframe in yet?

Yet again I have been pretty slack at keeping an update of my build! I tend to post once I have finished a certain mod/upgrade. But haven't actually completed anything yet. Just started a bunch of jobs

Let's carry on with disassembly of the engine aye. JamieR and I continued to take the engine apart. I haven't had a good inspection or measured anything up as of yet. Plenty of pictures coming up here

Bearing has definitely seen some action.



The apex seals look to be nice and straight... But the little corner bits are all bent like this which is a strange one. For the rear rotor at least (from memory). I don't think I have seen this before?



General condition pics of inside the rear half of the engine. You can see a bit of heat has been in the E shaft. Unsure if this is normal or not?









Rear Rotor







It looks pretty much the same on all 3 ends



Front half of the engine











Mmmmm crap filled coolant passage. This is a spot where the housing/plate doesn't match up and causes debris to get stuck. This was an awful lot though



Jamie says hi






Now in the last few pictures is where things got a bit strange for us. First of all on the front plate - it is quite clear that the seal and gasket is very distorted/damaged for the front plate oil system. Secondly was the front cover has a chip out of the bottom corner and filled with a blob of silicone . It seemed to have sealed it, but I don't like the idea aye. A quick go over with a tig welder would have sorted that out easy enough

Now the next one is a bit more concerning. Jamie and I (VERY) carefully removed the front rotor, trying not to have the seals fly all over the place. I would like to keep everything in its place so I can assess what is damaged and where it was damaged when the time comes. A couple of the seals inevitably fell out as Jamie slowly lifted it up before I could wrap the rotor up . This is when we both looked at each other in shock. No words. We knew exactly what the other was thinking. One of the corner seals had fallen out and didn't have a spring behind it. The spring was non existent

I mentioned how I haven't measured or inspected anything in detail yet. So these pictures are about all I have to go by for now. If anyone spots anything I haven't mentioned, feel free to point out aye!

Earlier in the year I had finally found a nice indoor spot for the 7 for now hang out! This will give me the space needed to really strip down my car and get some good jobs done. Although it isn't too close to home, so only tend to go once a week so or. When I'm not stuck at home with Covid


Called a mate who has a trailer. First time seeing it on one which was pretty weird



New home! I did clean up and reshuffle things around. So it is sat in a better position now


It also happens that old mate GT James is in the same unit .Got a bit of a rotary shed going on now!

# RotorCave

nice one... you can't beat having a mate there too for moral support

Hi guys, long time no post.

What corner seals are you using? They look quite chewed up.

I’m keen to see the plate faces. It looks like the rotor faces have been contacting the plates above the corner seals.

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