I yanked my OMP cause I just didnt want it there. I was premixing a small bottle with the OMP and decided to just go premix only since I was going to be pouring it in anyway. I run the PFC, and I havent had any problems at all.

Of course the tuners like Cam and Peter and all the other guys dont recommend ditching the omp. They all sell upgraded ecu's and piggy backs and it goes into limp mode without the omp. They couldnt suggest it no matter what they thought was better.

Also, I believe premix is better but in a stock car that they have to sell to the general public there is no way it could be premix. Sure we should all just take Mazdas design to heart, after all the avg motor last about 70K, they must have spent a long time testing cause they knew it would make it JUST past the 60K warrenty...most of the time lol

Does anyone have any evidance that the OMP is better???

STEPHEN

 

I have a question about premix in the gastank and no omp with a pfc. You can turn off the fuel cut on decel on the pfc, well at least not with the commander. What happens for the short amount of time when the fuel injectors shut off, during decel, there wont be any premix being injected. Is this short period of time dangerous to the engine?

 

if you can still run it, run it. but there is no load on the motor during the decel cut and i would not worry about it. many people have been runnign the haltech this way for YEARS and i have personaly never heard of a problem with it. good question though, at least you are thinking.

 

Why would you remove your OMP?
It's such a hassle to put in some premix when filling up some gas.
My OMP doesn't work and it sux.

 

1) Seems like most people remove the OMP because it fails or so they can run synthetic in the engine. Both are good solutions.

2) A lot of 2-stroke MC's use to fail because ppl ran premix and a rider left the throttle closes on a long coast or downhill run. I suspect a RX-7 could have a sismilar problem, but it would show up as premature engine wear and the cause would be hard to determine.
I suspect the Mazda OMP has a 'smarter' injection profile than you can achieve with premix. This eliminates both the closed throttle wear problem and spark plug fouling.

3) The product at http://www.rotaryaviation.com/oil_in...p_adaptors.htm is a great solution and was designed for ppl who may DIE if their engine fails

I am not sure its worth the expense for a street engine and also you have to remember to keep the little tank fill, just like on Gen-1's

 

IMO. I think that premix would be more reliable than an electronic pump that has failed for some of you. To me this might be of some concern. Especially if the PFC does not limp home if the OMP fails. I am going to get crusified for saying this but... Wouldn't you say our engine has more 2 stroke qualities than 4 stroke?

 

That's a pretty nice little piece. Man, I keep seeing new gadgets that I want to try out

 

THIS HAS TO BE THE WORST RESPONSE I HAVE EVER SEEN (Well may be next to the one about a guy wanting to make the FD a FWD car ...). By saying that people are not thinking for themselves, you reveal your failure to think through.

I have seen this sort of logic in perpetual motion machine invention. A little knowledge is a dangerous thing.

Let me note the following from your response.

First, there ain't no "cylinder temps ..." in a car.

Second, combustion temperature is higher than 1600 F, whereas flash temperature of oil is about 600-800F, so yes it does burn.

Third, what basis do you have for a "futile attempt ..." This is a company runs by engineers. You think they stuck a solenoid on for no good reason hoping that it'll somehow fool everyone?

 

All i can say is wow.hahah resource has his own shop and doesnt know crap.hahha.i removed my omp and it runs like crap.i have a pfc and its in limp mode.hahaha.i swear.make sure i never use them.

 

Very valid point. I would offer however that if Mazda wanted the premix in the fuel they could have very easily had the OMP plumbed into the fuel rails rather than plumbing it directly to the motor. My guess is that Mazda prefers the oil injected directly as they again show us with Renesis.

 

Good point DamonB.

To further support what you said, on the 1st gen 12As, Mazda injected the oil into the carb. So, apparently Mazda thought it was an improvement to move to the direct oiling system instead of mixing the oil with the fuel, for the 2nd gens.

 

I have to agree with you on this..

I recently took some time and read the history of rotary engine.. and you know, after reading it.. i completely understood about the term "research".. I'm medical research and most of the time, its pretty straight foward.. But the whole "R&D".. wow.. I know why sometimes, I have to agree about what mazda do.. other stuff. i know they are trying to save money.. but this, I don't see point of them doing unless its necessary.. Really, why would they spend R&D time money to make OMP?? And the reason behind it make sense.. well, to me at least..

 

Doesn't really save a few pounds. OMP doesn't weigh 3lbs or close to it. You'll have to have a bottle or two of pre-mix with you all of the time too.

Clean things up? Like cleaning up the pre-mix that leaks out of the bottle on to your carpet?

 

You don't think do you? The rotor housing is NOT hot enough to burn the oil on contact.

Wonder how the same concept works in piston engines, oil control ring leaves oil on the cylinder surface. Also the aluminum pistons seem to not melt even though the temp of combustion is higher than the melting point.