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I could be wrong, but I sort of doubt its an apex
seal, John.
The reason is a bad apex seal will
generally make starting very difficult (two chambers down on compression),
but once started an engine with a bad apex seal will generally produce power
(just not as much as with good seals) enough to get you up into the 4000-5000
rpm. Generally just a normal compression gauge will tell you whether you
have a bad apex seal as you will get one face with good compression and two with
low compression. But, of course, a professional Mazda compression test is
the ultimate.
You generally will also find a bit of
vibration when an apex seal goes as the power pulses are no longer in
balance.
It sounds to me like your are not getting enough
fuel if you can not make enough power to get beyond 2300 rpm. Even if you
were not staging and getting all four injectors, two should easily get you up
into the 4000-5000 rpm range. I presume the throttle body is opened fully
when you are at 2300 rpm - no slipping throttle cables? No pinched fuel
hoses? No collapsed air filters/hoses?
Ed Anderson
----- Original Message -----
Sent: Monday, October 04, 2004 8:45
PM
Subject: [FlyRotary] Re: Low power 20B
operation
After fixing the injector switches, EC2, PCM and
triple checking all the ignition and injector circuits I STILL have an engine
that runs like sh.t. 2300 rpm full throttle. I'm beginning to suspect an
internal problem like an apex seal or O rings. Tomorrow I'm having a
professional mazda compression test done.
Is it running incredibly rough? It's semi-likely
that you could have a stuck apex seal as long as the engine has sat
around. I think Ed is our resident expert on trying to free those.
Even an unprofessional compression test would tell the tale.
John (Please tell me it's not a blown engine)
Your neighbors must get tired of that black cloud over
your house all the time. I'm starting to think you and Al need
to take a trip to New Orleans and have a consult with one of the
voodoo folks :-)
Seriously, I'm sorry to hear of your continued
problems. I can only imagine how frustrating it must be.
Hang in there.
Rusty (feeling better about my engine with every
message I read)
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