Also, I am sorry to say, those Seimans injectors do not fit the
injector holders or the fuel rail. My mistake. I'll buy them
from you
and keep them around. However you need four RX8 yellow fuel
injectors.

Paul Lamar

Paul,
Bill Bradbury described what's happening with his engine, and it sounds
pretty much the same as what's going on with mine. Below staging,
it'ssmooth, but above, it runs rich and in flight there's a lot
of poppingand surging.

He then reports that he has had good results by switching his
stock redand blue injectors to the yellow ones, that I 'm
assuming, but I'llcheck are yellow RX-8 injectors. Will they fit
my 93 13 BREW and wherecan I get them for as little $ as possible,
 and how much would that be?

On another note, I still have not gotten the last few pages of
the plansfor my RV off to you, I still have to get up to the
hangar and get themoff to you.

Brian Trubee

I have not researched the supply yet but Michael Hart is about to
dothat sohe will let us know.

Sounds to me like the trim map is wrong on the top end. You could
haveone or more partially clogged injectors. It takes a special circuit
and a burette to test injectors. The fuel coming out should be
directly proportional to the pulse width.

Here is a schematic of a DIY test device.

Also you could sample the air pressure in the runner with a couple
of pressure sensors and a data acq system. If my plate was not running
over I could come up and do that. It will be the end of April before
I am free enough to do that.

I don't think the RX8 injectors will fit your current injector holders.
You could get RX8 injectors and they might not change things. If not
it is the trim map. If they do you may currently have one or more
badinjector. Getting them tested may be the first thing to do.
 There are some companies around that specialize in cleaning and
calibrating. Paul Yaw may still do it. http://www.yawpower.com/ New
 ones are getting socheap it might not be worth it.

Where are Bill's injectors mounted?

I see your secondary injectors are on the outer tubes a foot or so
from the port. What happens when you lean them out?

Is that a damper I see on the end of the secondary fuel rail?

Take some closer pictures of the EFI system.

Don't worry about the plans. Michael White kindly made me a gift
ofa set he was not using. Thank you Michael. They came in.

Paul Lamar

I had the injectors cleaned and flow tested just prior to engine start.
The thing you see on the end of the secondary rail is the fuel pressure
regulator.

The other day I went out and ran the engine up on the ground,
specifically looking at EGTs for a mis-match of EGTs above the staging
point. What I saw was that the EGTs were pretty consistent all
the wayup and down the RPM range. So, I'm thinking that I'm just
rich up in theareas above staging. Well, the EC2 should be able
to compensate if Itune it right, so I'll keep twiddling the
program knob. When it runssmoothly, it's like silk. I"m just a
bit tired of the tower gettingcalls from the local communities
about a plane in distress overflyingthem. Also developing a
crease in the bottom seat cushion from excessivepinching.

Brian Trubee

Well when I get time I am going to work on the engine monitoring
system that will read and store the history of the injector pulse
widths using a USB port to a PC. I think that is going to help
trouble shoot
these kinds of problems. Should be about the end of April.

Paul Lamar

Hi Paul,

Here is the story about the Denso injectors.The cheapest I can
find isthe Denso 195500-4450 which is rated @ 450cc/min at 3
bar.These cost$75.00 per injectors and $70.00 if you buy 4 of
them.These can be foundat www.fiveomotorsport.com/fuel-
injectors/mazda/rx-8/ .The secondcheapest is the Denso 297-0041
and these cost $129.00 and can be foundat
http://www.densoproducts.com/resultsSearch.asp.The problem is that
for the life of me I could not get the specs on the 297-0041,I
googledthem in many ways but could not find the specs,however
they are listedas the original for Mazda RX8.So I do not know
which one to buy,can youtake a look at these and let me know.BTW
the remote filter bracket is onthe way.Thanks.

Michael

450 cubic centimeter = 0.118 877 423 56 gallon for the 195500-
4450.AKA 7 gallons an hour. 28 gallons per hour total for four.
3 bar is 45 psi.

Sounds like it will do the job at 45 psi.
Mazdatrix tells me the factory is charging about $150 each.

Paul Lamar

The Denso 195500-4450 are on the way.BTW you can buy rebuilt Denso
injectors for $60.00 at  http://www.fuelinjectorsoutlet.com/  these are
the original parts for your engine rebuilt.The price includes $12
core charge per injector,you get it back after you send them your
old core.I decided to buy the new ones since I don't have a core
hence the difference is $10 to me.

Michael


FiveoRacing also has a Bosch 0280156127 they say Ford rates at 39#/hour but
their tests show 42#/hour.
They also show a Mazda 3, 5, 6, 2.3L custom injector that is rated at
525cc/min or 50#/hr. Pt # 4L8EMAZ525. Sells for $260 for four.

Dale Davies

The big problem with Fiveo is they donot give you dwgs with dimensions.

Paul Lamar