Hurt the 13B, but what is the diagnosis?

[iaint]

When I shipped a seal it sounded exactly like your original description.  Didn\'t have any issues starting mine up though but low rpms and idle was bad.

If the idle is back to normal it could conceivably have been a stuck seal that\'s come unstuck but I\'d guess that\'s a long-shot.

[StavFC]

Yeah, that sounds like mine, by starting issues are gone, starts nearly as easy as ever now.
 
Heres a vid I did about an hour ago that might help diagnose. Best off watching it in HD as its clearer then.
Ignore how difficult it was to start, it had an empty tank id just filled with a jerry can, you can hear when it finally gets fuel as you hear the whirring of the pump.
Can hear the whirr at 7sec then it immediately fires up.
http://www.youtube.com/watch?v=w_z5XM1WOJQ
Can see the boost gauge fluttering, and the vac seems low to me, but it only flutters by 0.05 of a bar at most.
 
Read the description of the video for a low-down of my findings, or lack of, so far.

[MaLicE]

hnmmm i watched the vid and its not really like mine when the tip went... sounds more like a stuck seal...

tried the water flush?? people in america do it to unstick seals and clean the engine, litre of water in a jug, vacume hose in to jug of water, raise the idle to like 3k, connect vacume hose to the inlet mani and let it suck the water through... making sure you keep the revs up...

[StavFC]

Seems comparing it to a few mates piston engine cars, 0.4bar (5-6psi) vac cold idle, like I got, is about the norm. Can anyone tell me what their rotary gets?
 
Never heard of the water flush, but ill try whatever, got any links to people doing it?

[TRIND-FD]

Water flush is a way To de-carbon the inside of the engine, Basics its just like an internal steam clean. Boosts compression a bit aswell. Sea foam is what they use as well for a stuck tip. rx7club . com  is where its all at.
Keith

[TRIND-FD]

Water flush is a way To de-carbon the inside of the engine, Basics its just like an internal steam clean. Boosts compression a bit aswell. Sea foam is what they use as well for a stuck tip. rx7club . com is where its all at.
Keith

http://www.rx7club.com/showthread.php?t=815578&highlight=steam+clean    
 
Try this one

[Prof]

Seafoam would be my choice - but you were running water through the engine as water injection - so carbon buildup shouldn\'t be too bad.
 
Looks like the boost gauge is showing a distinct \'wobble\' - which is often seen with apex seal damage.

[StavFC]

Just had a look on the engine, dont seem to be an easy place on the inlet manifold that would distribute water to both rotors. Im sure i can sort something, but its not exactly flush with vac ports.
In a dream world this is what happened, but due to me using water injection anyhow, it may be wishful thinking.
Might still have a go if not got hold a of a rotary comp tester by then.
 
If my sums are right, its showing 8.9in to 14.8in of vac in the vid, but mostly on the lower end of the scale, and 15 is about right for a large street port it seems.

Wouldnt a post throttle inlet leak make the vac far lower too though? As obv I been running 1.5bar boost, so things like gaskets and pipes do pop with that much pressure.

Maybe wishful thinking, but I dont wanna remove and dismantle an engine if I dont have to!
 
Bloke on RX7Club said this, and he may have a point...
you have a dead seal, it is easily apparent in that evened out dead spot sound during cranking[/b]

[StavFC]

Did these vids jus now, the woosh tests...
 
Front rotor-
YouTube - Woosh testing the front rotor on my RX7....
 
Rear rotor-
YouTube - Woosh testing the rear rotor on my RX7...
 
Both rotors-
YouTube - Its a rotary steam engine.... All plugs out woosh test.

[StavFC]

Quick update...
 
With the help of the incredibly helpful and knowlegable Ben Lewis, we took my engine apart today to assess the damage...
 
Yup, bit of an apex seal came off...

 
Thing is though, it didnt touch the housings at all! Not a mark on them! Its all fine. Woop. Maybe running 1.5bar and 660cc of water blew the seal out before it hit anything, lol.
 
Had solid corner seals too (ie no rubber bit in middle), 3 piece apex seals, uprated oil pressure regulator, and so on too.
 
After a day cleaning and stuff, this is how it all looks now...
 




 
We did a VERY interesting side by side comparison of stock FC versus stock FD versus my ported FC housings and irons too, but I guess thats a seperate thread all together if anyone cares...

[Prof]

Looks clean inside.
 
I\'d be interested in your comparison of the engines and porting.  I\'d also be interested to see which rear iron you\'ve got - as there are 3 or 4 variants - they differ around the oil pedestal.  Do wonder where you\'re bit of apex seal flew off to - likely it came out of the exhausts - so probably worth checking the exhaust turbine wheel to see if it nicked a blade or two on the way out.
 
On one engine I lost to detonation, part of the apex seal was buried in the rotor face !

[BlitzBoy]

thats good nothing else has been damaged with the chipped seals, should be an easy rebuild, just new apex seals,springs and water seal kit and a way you go.
+1 for pics on the comparisons of the different ports

[StavFC]

Yeah very lucky really it didnt scrap a housing, we was amazed really. And yup, took all day, but they cleaned up VERY well!
 
Shall I start a different thread about the ports? I know people are dead secretive about their ports, but I dont give a monkeys, a lot more to rotaries than port size and shape, so ill share the love.

[BlitzBoy]

yes please do start a new thread be good to see how the Jap tuners port the FC plates as the FD ports are taller

[leon]

Put up another thread with your ports, I think it only the tuners who dont show theirs, unless you look over in Australia and they show you how to replicate their ports and give advice :rollin