Over-Rev Disaster?

[parrotfever]

Engine came apart yesterday. Photos of rear rotor & housing. Any opinions as to cause?

Also, next step? Anyone got a rear rotor & housing in good shape for sale? PM me please!

parrotfever Bob

[djmtsu]

Contact Kevin Landers!!!

www.rotaryresurrection.com, or just PM him here!

And it looks like it pukes a seal or something. There had to something hard bouncing around in there to gouge the rotor like that!!

[My5ABaby]

It'll buff out.

[JL1RX7]

Some duct tape bondo and wire coat hanger will fix it!

[TitaniumTT]

That doesn't look like an over-rev to me. Something got in there and chunked it pretty well.

Porting in the future? Whatever you do, don't reuse N/A housings, get some TII ones or change the sleeves if you do get N/A housings

[rx7 FC TII]

some JB weld and duct tape will fix it.

yes its trash. contact kevin landers. he rebuilt my motor and ported it. did great work for a good price

[SecondGenPat]

Porting in the future? Whatever you do, don't reuse N/A housings, get some TII ones or change the sleeves if you do get N/A housings

Where can you pick up just the TII sleeves from? I've never heard of that before.

[parrotfever]

Porting in the future? Whatever you do, don't reuse N/A housings, get some TII ones or change the sleeves if you do get N/A housings

I see 'where to get' raised already - but my question is: Why not use NA housings (not the damaged one, of course)? And, by sleeves, do you mean the sleeves in the exhaust port? Again, why not? Part of my goal in this has been to finally understand this creation in all its glory. So please, Titanium TT (or anyone else for that matter), help educate an acolyte!

parrotfever Bob

[Rotary Inspired]

The N/A sleeves are have the baffler in there for noise reduction. The sleeves obviously hurt flow and are a PITA to port around. I have done it but its not worth it. Get TII sleeves or I prefer 3rd gen housings because the housings don't have the holes for the coolant to go into the intake manifold. I agree that is not a overrev. that is something in the intake. Are all the apex seal there(each piece of the 3 piece seals)?

[NoDOHC]

You can cut the diffusers out with a hammer and cold chisel is about 30 seconds. It is a lot of work driving the dowels out, I would just remove the diffusers from the NA sleeves (making them identical to turbo sleeves).

I have never seen a stock rotary fail due to overrevving. I would guess this was carbon that built up in the intake manifold due to the oil injection and then got sucked into the engine at high speeds when the ports opened.

[TitaniumTT]

The roll pins are a piece of cake to remove if you have a MIG welder and a set of vice grips. I've been told the sleeves themselves are inconel and I would be surpirsed if a cold chisel and a hammer would break them.

As said before, N/A housings are fine to use and are easier to come by in good shape. The sleeves have the baffles in them for noise reduction and they kill flow. My understanding is there is a difference in the sleeve itself and by cutting or grinding them out, they flow just as bad and now they're loud as all get out. I never really paid enough attention to the differences outside one is baffled and the other not to speak intellegently not do I believe anyone has done flow testing and posted results either.

If you can find someone who tears apart alot of blown engines, he should be able to salvage a few sleves for you. Might even throw them in for you if you get a set of housings as well.

[solareon]

Don't the turbo housings have the hole in them for the water jacket passage through the LIM? And the NA housings have this plugged

[NoDOHC]

I don't know what the sleeves are made of, but a pneumatic chisel makes very short work of them.

I am not theorizing here, I have done it several times.

An NA housing can easily be drilled for the water passage to the turbo.

Really, turbo housings are the same as NA housings, with a little additional machine work (drill hole out, remove diffuser)

I had trouble with the roll pins, but I didn't try the MIG and vise-grip idea.

edit: there is no difference in the sleeve (except for the diffuser) and the NA sleeves flow just fine (once the difuser has been removed).

The turbo port timing is identical to the NA.

The REW port opens earlier, hurting fuel economy, raising EGT and mildly improving flow.

Here are some pictures:
NA Sleeve
6142
NA Sleeve w/o diffuser
6143
Turbo Sleeve
6145
Streetported turbo sleeve
6146
RE/REW ?? on left, NA on Right
6147