Let's talk about fouled plugs - Page 2

RICE RACING · 03-30-2012, 11:33 PM

That is why I am a Don Mega **** Bag

What seals did you use?
How was the rotor housing on the front?

As some sort of practical help, if you take it easy and they are factory apex seals it will take about 7000km of daily running to make them flat or conform to housing distortions.

I'd be interested in your compression test to see if this is the problem or not.

FWIW I have "rebuilt engines for a total of $300 for mates many years back, one was a 3am job in his garage replacing a rotor housing with one I use to jack up my car! (filed the rough spots off where the chrome was chipped!) and slapped it back together with new Mazda Apex seals, that motor survived for years at 22psi boost on a T04 and about 480bhp lol, it was how I learned about the power of stock ports. Even on a dodgy rotor housing (by my standards 10 years ago) it still had good compression to not foul a plug, but ran OEm stock 2mm seals.

My world is not much different to anyone else's here, that is why I post up advice (and a bit of a rant some times haha)

JustJeff · 03-31-2012, 07:21 PM

I used Atkins apex seals, new side seals, new plugs for corner seals, FD springs, all new springs all around. I reused the oil control rings with new springs. I replaced damaged front housing and rotor with used housing and rotor. I checked tolerances with everything that went back into the engine and everything was within spec. It's a JDM engine and was very clean inside. The replacement housing was also JDM and the rotor is out of an FD.

I did a compression test the traditional compression tester way. Engine warmed up, EGI fuse out, CAS unplugged. I took the front leading plug out to test and the rear trailing plug out. I had trouble getting my compression tester hose in the trailing front because of a/c and p/s. I was able to get it in the leading hole and went with that.

Front has even bumps of just over 90 and when I let the compression build it was just over 100.

Rear has even bumps of just about 100 and built up to 120.

From what I've read you want front and rear no greater than 20psi so I'm borderline.

I ohm tested my plug wires
T1=5.47 and is less than 3ft long
L1=8.07 and is just over 4ft long

T2=5.11 and less than 3ft long
L2=8.28 and just over 4ft long

I haven't tested the coils yet, Final Four is on for one, but I also need to read up on how to test the coils.

RICE RACING · 03-31-2012, 10:12 PM

That sound acceptable to me using that type of tester assuming it winds over near 250rpm test std. Anything reading around 90psi on a normal gauge should not cause plug fouling.

Have a look if you have a leaky secondary fuel injector on the front rotor, you can check this by taking off the top half manifold and simply priming the fuel pump. This is/can be a common cause too.

JustJeff · 04-01-2012, 12:39 AM

Leaky injector was exactly what I was thinking. I'm occasionally smelling fuel but have no leaks. When I did the compression test on the front rotor I got an initial poof of gas smell and then it was gone.

I had been worried I had a coolant seal leak that could have been fouling the plugs, but I'm not loosing any coolant and I keep passing the bubble test...that and my plugs were dry when I pulled them today.

JL1RX7 · 04-01-2012, 06:28 AM

Jeff I got two 460 injectors off another member and if you want them to use while you send the other ones off let me know.

JustJeff · 04-01-2012, 08:05 AM

I appreciate the offer, but I'll simply let the car sit and drive the van. I've got 550/800. I've got a RB exhaust, custom TID and Rtek 1.7 on the car. I even though the engine is in break in and not seeing any boost or RPMs above 4k...I'd hate to run the risk of running lean and detonating.

I have a question related to leaky injectors. I had engine parts powder coated and was not thinking about the dampener/regulator in the S5 secondary fuel rail. Should I be replacing my secondary rail because that dampener/regulator could have been damaged during baking?

FerociousP · 04-01-2012, 11:43 PM

Quote:

Originally Posted by JustJeff

I appreciate the offer, but I'll simply let the car sit and drive the van. I've got 550/800. I've got a RB exhaust, custom TID and Rtek 1.7 on the car. I even though the engine is in break in and not seeing any boost or RPMs above 4k...I'd hate to run the risk of running lean and detonating.

I have a question related to leaky injectors. I had engine parts powder coated and was not thinking about the dampener/regulator in the S5 secondary fuel rail. Should I be replacing my secondary rail because that dampener/regulator could have been damaged during baking?

The dampner is in the primary rail, the regulator is in the secondary rail. I'd tee is a fuel gauge before replacing the regulator. test are pretty straight forward... but, both the front and rear would be flooding if your pressure was too high.

JustJeff · 04-03-2012, 05:35 PM

Quote:

Originally Posted by FerociousP

The dampner is in the primary rail, the regulator is in the secondary rail. I'd tee is a fuel gauge before replacing the regulator. test are pretty straight forward... but, both the front and rear would be flooding if your pressure was too high.

That's what I was thinking. The fuel rail is open so both would flood.

Pete_89T2 · 04-03-2012, 06:01 PM

If you have flooding in only one rotor, it could be that one or both of the injectors on the flooding rotor are leaking down. In other words, the injector is gummed up and not closing fully when you shut the car down, so only that rotor floods.

JustJeff · 07-16-2012, 09:39 PM

I've been driving the car daily. Fuel injectors were sent to witchunter for cleaning. I still have fouling plugs. So far it has only been the front rotor that is fouling....and I bet when I pull the plugs I'll find the same thing.

WankelsRevenge · 07-17-2012, 12:41 AM

I havent read this whole thing, but are you still running your OMP? If so could it be an issue with them spraying too much oil into the chamber? Also maybe youre not getting enough spark in that chamber which could be causing you to not get a complete fuel burn. Granted, Im just pulling these ideas out of my head, so Im not sure how plausible they may be.

03-30-2012, 11:33 PM	#16
RICE RACING Don Mega Join Date: Dec 2008 Location: Utopia Posts: 1,688 Rep Power: 18	That is why I am a Don Mega ** Bag What seals did you use? How was the rotor housing on the front? As some sort of practical help, if you take it easy and they are factory apex seals it will take about 7000km of daily running to make them flat or conform to housing distortions. I'd be interested in your compression test to see if this is the problem or not. FWIW I have "rebuilt engines for a total of $300 for mates many years back, one was a 3am job in his garage replacing a rotor housing with one I use to jack up my car! (filed the rough spots off where the chrome was chipped!) and slapped it back together with new Mazda Apex seals, that motor survived for years at 22psi boost on a T04 and about 480bhp lol, it was how I learned about the power of stock ports. Even on a dodgy rotor housing (by my standards 10 years ago) it still had good compression to not foul a plug, but ran OEm stock 2mm seals. My world is not much different to anyone else's here, that is why I post up advice (and a bit of a rant some times haha) __________________ www.riceracing.com.au** Worlds best Apex Seals Coil on Plug Water Injection ECU Calibration Last edited by RICE RACING; 03-30-2012 at 11:38 PM.

03-31-2012, 10:12 PM	#18
RICE RACING Don Mega Join Date: Dec 2008 Location: Utopia Posts: 1,688 Rep Power: 18	That sound acceptable to me using that type of tester assuming it winds over near 250rpm test std. Anything reading around 90psi on a normal gauge should not cause plug fouling. Have a look if you have a leaky secondary fuel injector on the front rotor, you can check this by taking off the top half manifold and simply priming the fuel pump. This is/can be a common cause too. __________________ www.riceracing.com.au Worlds best Apex Seals Coil on Plug Water Injection ECU Calibration

04-01-2012, 06:28 AM	#20
JL1RX7 Rotary Fanatic Join Date: Feb 2008 Location: Front Royal, VA Posts: 487 Rep Power: 18	Jeff I got two 460 injectors off another member and if you want them to use while you send the other ones off let me know.

04-03-2012, 06:01 PM	#24
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	If you have flooding in only one rotor, it could be that one or both of the injectors on the flooding rotor are leaking down. In other words, the injector is gummed up and not closing fully when you shut the car down, so only that rotor floods.