I am getting a streetported s5. I was wondering if I got this manifold(http://www.atkinsrotary.com/store/cu...cat=453&page=1) would I be able to use any carb? I heard since the engines were EFI and I am going carb you have to weld the stock manifold or something like that. If I get this will I be able to bolt up a carb to this manifold put on the engine and drive? I need help PLEASE!!!!

 

I have that manifold. You couldn't pay me to use it. The castings are terrible. None of the ports even resemble round and the center runners don't even line up vertically. It could be fixed with some work but to spend that much money and then have to fix it makes no sense. If you still want to play with one, I'll dump mine for $50.

 

No manifold is going to let you bolt on "any" carb. I dont know much about that one but I dont think its for a carb. What kind of carb are you looking for? 4bbl Holley? 2 barrel? side? top? There are different manifolds for different carbs.

 

So what could I do to get the s5 streetported engine to run with a carb without premixxing. And what about the omp?

 

If you're using the S5 LIM, talk to Robert @ Rotaryshack about a modified dellorto upper intake.

 

Thats what I have been told by my buddy. I thought it was just a bad batch. I guess not.

 

Either a RB holley 600 with manifold or a RB weber 48 IDA with the manifold from them. Probably the best setups if you don't know much about carbs. They come pretty much properly jetted I believe.

 

base jetting only.

 

you still have to premix though right? i dont know much about them as i'v never used anything but the Nikki, but I wouldnt expect they'd work with the OMP as its only a rotary thing

 

No, with the RB carbs you don't have to premix. They have the OMP nipples built into them already I think.

 

Correct, but what would run the OMP? If you take an S5 engine and swap the 12A/-SE cover onto it, you have to machine it accept the S5 OMP, and you have to run the S5 ECU to make the OMP work. The S5 doesn't have the lever inside of the engine to acuate the mechanical OMP that is found on the 12A/-SE/S4 engines.

The whole reason that southernrunner (and myself) are going carb is to get away completely from the wiring harness.

Apparently, though, we're going to have to run the ECU reguardless, whether it's for full fuel injection or just the OMP, correct?

This is all such a pain in the ***...

 

Thanks for clearing that up for me Shawn, this **** is giving me a headache. lol

 

Giving you a headache!? I've been searching this site for 2 days reading a bunch of the same stuff with no clear, concise answers!

The closest thing to clear and concise that I have found is this:

But that still doesn't explain what is driving the OMP....

 

I looked for the right up on the engine swap but didn't find it.

 

You just run a 12A OMP and block the oil injectors in the rotor housing. Or you can run an SE OMP. What's so hard or complicated about that?

The only reason to run a S5 OMP is to retain use of the stock ECU.

 

Now that I step back and think, I want to slap myself. I was only confusing myself. By changing the front cover, I still retain the mechanism to make the MOP pump, correct?

You see, I was, for whatever reason, thinking that after changing the front cover, I no longer had the lever to run a MOP.

Jesus, I feel like such a

Thank you so much for making me step back and actually think.

 

So this is solving all of our problems?

 

This still won't work. Does anybody have a pic of an s5 n/a without the front cover on?

 

Yeah, unless the S5 engine still has the toothed gear that goes on the end of the e-shaft, it won't work. Does the S5 have the toothed gear on the end of the e-shaft? If not, can one be put on?

I'm going to get pics to post up of my front cover. Can someone please deliver pics of an S5 front cover?

K. Here we go. Does the S5 e-shaft have the gear to spin this:




If not, how in the hell are you guys "just swapping on the 12A front cover and running the 2-line OMP"? That gear either: A) has to already be on the engine or B) must be put on the e-shaft.

 

Look, the S5 OMP is still driven manually by the sprocket on the e-shaft! Only, the amount it puts out is controlled electronically by a throttle sensor instead of a direct linkage.

There is no problem running a 12A or SE OMP if you wish to do so. The only thing you need to do is fabricate a linkage to the throttle.

 

THANK YOU! That's exactly what I needed to know. Now, was that so hard?

 

They all work that way. Pick a year. It works that way.

 

So bottom line is, change the front cover and it will work on an s5 motor?

 

Yes. All you need to do is make sure that you retain the stock metal rod that connects from the OMP to the carb.

 

Ok, to clear up what has been said about the OMP, you CAN use a 1st gen front cover and OMP. The stock OMP from a 1st gen 12A or 13B will work, as long as you have the rod that connects to the carb/throttle linkage. You don't even need to think about the S5 OMP as the only part thats special about it is that the amount metered to the engine is controled by electronics instead of a rod connected to the throttle linkage. That is the ONLY thing that is different.