zoom44

Was just reading this TSB. Its a bout an issue with people experiencing higher oil consumption than they are used to and a "FIX".

http://www.finishlineperformance.com...30-09-2159.pdf

Turns out the issue they are tracking is caused by using a part from 2009+ rx-8s in 04-08s


So this might be an easy way for people to inject more oil without tuning. I wonder how much the increase actually is. might be an alternative to pre-mixing for people worried about dirty socks or for the measuring impaired...

newcastle

iTrader: (3)

Interesting.....subscribing.

supergoat

Your ideas intrigue me, I'd like to subscribe to your newsletter.

nycgps

iTrader: (1)

I noticed that TSB months ago.

I rather use premix in my gas ...

Jedi54

iTrader: (7)

you have an AccessPORT and Idemitsu premix in your garage, you don't need this.
this is an interesting 'fix' for some guys who want to try and get more oil in there without tuning or pre-mix.

I wonder what mazda considers 'high oil consumption'

nycgps

iTrader: (1)

from 0.5 quart to 0.6 quart = "high oil consumption"

olddragger

iTrader: (3)

what a minute--- i thought the mop was a volume delivery system---how can vacuum get by that?
OD

Charles R. Hill

iTrader: (7)

Since the OMP nozzles are vented to atmosphere, it is a volume-measured/vacuum-delivered system (for the most part, anyway). As the engine vacuum approaches 0 in./hg., manifold, the OMP pressure is more responsible for the delivery.

Mazurfer

I also noticed it a few weeks ago, and was wondering about it, and wondered how much additional it was really adding?
I think I'd still be inclined to premix in the gas as well, but itr is interesting.

olddragger

iTrader: (3)

so in essence, engine vacuum can pull oil through the mop?

zoom44

Yes thats how i read it denny

Charles R. Hill

iTrader: (7)

Engine vacuum is largely responsible fior the delivery. Mazda has a procedure in the service manual for checking the operation of the OMP nozzles' venting system and improper venting can result is low or zero oil flow. This is why we all spent so much time pondering and discussing the issue in F/I applications.

olddragger

iTrader: (3)

wow
This could make for a totally different line of thought
I wonder what amount of volume change occurs?
Anyone?
Kinda makes sense --vacuum occurring on both ends cancel each other out.
OD

Charles R. Hill

iTrader: (7)

Mazda's illustration is rather lacking, as is their explanation (what else is new?), but the way the OMP venting system operates has been discussed and can probably be found in the "Pettit Supercharger Owners" thread (somewhere).

ASH8

Yeah, Interesting...I also noticed this and posted a thread on the PART Difference or Supply Mix Up months ago....correct part number wrong part inside.

But it makes some kind of sense, as the 09's do not need this extra or 3rd connector like the 04-08's as Series 2's have a totally different MOP mechanism (that being fully electric).

Strange Part is the S1 Hose Part Number N3H1-13-221E with the 3 holes is about $144, But if you want the same part for a Series 2 with 2 Holes, according to My EPC it is ONLY available with other Small Vac Hoses and Resonance Chamber (small square Black Box) as a Complete SET.
Part # N3R1-13-22XA at $270...go Figure..

So if you wanted to try the 09 Hose on your Series 1 to increase Oil Use you could order a N3H1-13-221E and hope it has the wrong part (09) inside for $144, or Spend $270 on the 09 Part N3R1-13-22XA...and have a lot of useless Vac Hoses spare.

Crystal Clear?

zoom44

oh thats annoying

MazdaManiac

iTrader: (3)

When I was looking at the relative ambient pressures across the OMP system back in 2007, I had speculated on the effect of deleting this hose or valving it to alter the pressure differential.

In the end, in an N/A application, this change in the vacuum routing only affects oil delivery during very low load situations where increased volume just isn't desired.

ayrton012

Clear, thanks for the infos!

Anyway I think more simple and cheaper to plug in the third hole and the nozzle's vac hose.

olddragger

iTrader: (3)

who wants more engine oil in there? rather pre mix.
But for those with the sohn i wonder if this is something to play with?
MM low load could also be when you let off the accelerator ---right?

HiFlite999

iTrader: (2)

For n/a, the "vacuum" will be highest when the throttle is closed and decelerating. This is a good time to supply extra oil when there is nothing coming from the premix (if any) since the fuel is shut off. However, the second-highest vacuum is at idle, so you're getting extra oil when you don't need it. I don't know if the minus is worth the plus.

Charles R. Hill

iTrader: (7)

MM and HiFlite; I have been pondering the same thing for the past few days, which is why I haven't posted on that issue, but closing off the OMP vent circuit could deliver more oil during higher manifold vacuum which, as you both allude to, is seemingly counter productive.

Here is what causes me to pause on any conclusions: the Renesis has historically low OMP volumes in the areas where 99% of us do most of our driving..... low-load/high manifold vacuum levels (which is to say cruising and idling). In the higher load/low manifold vacuum ranges, the OMP system seems to be delivering volumes which help longevity (hence the "redline a day" theory).

To further confuse the issue from a philosophical standpoint; I would tend to not want to mess around with anything the presumably "knowledgeable" Mazda engineers designed for the Renesis but, then again, we on this forum have solved plenty of Mazda's problems for them with the RX-8 so I have no idea as to the effectiveness or desirability of this particular line of thought, especially if F/I were to be added to the conversation.

9krpmrx8

iTrader: (46)

Good info. I have been noticing that my SOHN reservoir is not emptying as fast as it would before, i don't have any CEL's for the OMP system but is there a easy way to test it?

MazdaManiac

iTrader: (3)

There is no need for more oil when you let off the gas.
No load, no heat and no need for additional compression.

Remember, the Renesis is, essentially, a dry-seal motor. The parts that need lube all the time (bearings) get oil all the time.
Injected oil is mainly there to cool the seals, not lube them.

HiFlite999

iTrader: (2)

Interesting, but I don't see how that would have much effect on cooling at the tiny volumes of oil involved. It takes almost no heat to evaporate the oil itself. Or does it work by wetting the seal and thereby increasing the thermal conductivity to the relatively cool rotor and rotor housing?

MazdaManiac

iTrader: (3)

You would be absolutely amazed at the effect of that tiny bit of oil.