Rob77

Hi all!

New to this forum and to the rotary engine also.

Am helping a friend who is in the middle of putting a 13b rotary engine in a Talbot Sunbeam.

We are converting it to use a single sidedraft carb instead of the standard fuel injection setup.

We will be using something like this:

http://www.racingbeat.com/FRmazda2.htm

http://www.mazdatrix.com/r-weber.htm

We are wondering what to do in the terms of distributor and fueling...

Do we use the original distributor and coil setup? If so what wiring do we need to keep?

As regards the fuelling side of things, are we best off using a FPR and a stand alone fuel pump?

Something like this:

http://cgi.ebay.co.uk/FUEL-PRESSURE-...QQcmdZViewItem

http://cgi.ebay.co.uk/FUEL-PUMP-FACE...QQcmdZViewItem

Obviously with a carb it only needs a low pressure fuel supply, so these components should be ideal...

What fuel pressure should it run? Any info?

Think thats everything for now...

Many thanks in advance to any help / advice received!



Rob.

diabolical1

iTrader: (3)

welcome to the board, Rob ... Robin of the Hood. (sorry man, i had to)

anyway, i would say get a pump that has a higher volume rating. for the carbies you'd be using with those manifolds, i think volume is a little more critical than pressure in the long run. in all likelihood, you'll be running a maximum of 5 PSI in any circumstance - but, more likely 3 to 4. buy you regualtor appropriately. i don't know what the popular reliable brands are in the UK, so i can't speak on that. however, if you can get your hands on a Holley regulator (or something similar) then get it. my old combo was Carter pump/Holley regulator, so i know it works well.

for ignition, the simplest way to go about it is to get a 12A distributor and some aftermarket high-output coils. wire it up for direct-fire. (you can get instructions on that in the Gen I section).

PinkRacer

Use a Holley fuel pump intended for carbs, or something similar, with a low pressure FPR. You don't want to run any more than 4psi really. We are racing and use a Holley Blue Electric that's 110gph volume, through a regulator that drops the pressure to 4psi max.

I actually have the manifolds here for a side draft carb set up (the racing beat manifold and it goes on the stock manifold bottom piece) and I have a Weber 45DCOE side draft carb. That stuff is all stuff I'm willing to sell if you wanted to buy it. It's coming off a 13b engine actually, so I know it will fit and it would be plenty of carb for your application. We're upgrading to a larger carb due to the engine being bridgeported.

And the above poster is right in that you need a 12a distributor and coils, and although it's a great idea, you don't absolutely need to wire it up for direct fire to get it running. Ours isn't wired that way yet.

Rob77

Thanks for the replies guys, much appreciated.

ToySport, how much would you want for the carb and manifold, and postage to the UK? Is everything I need included (except ignition and fuelling obviously)

Rob.

PinkRacer

Everything you need would be on there, you just take off the top part of the stock manifold where the fuel injection goes in, and drop the other one right on. All you'd need to buy is the proper jets, emulsion tubes, etc for your engine build. All I had with mine are the ones for a full bridge port which would be way too much for a stock engine. After you drop it on, you just hook the throttle cable to it, and it's ready to go.

It's currently still on the car and we just need to keep it on until the new carb gets here and we get that working (another week or so), then it's ready to sell.

We'd like to get $400 CAD for it plus shipping (Ground shipping to the UK is about $70 CAD, but it depends on the weight, might be a little bit more). This includes the carb, the K&N Air filter assembly, the Racing Beat upper manifold (and the gasket that's on it at the moment which is still good), throttle cable bracket that's on it (ready for the rx7 style cable to snap right in), the gasket for between the carb and the upper manifold. Basically, I'm going to unbolt the upper manifold from the stock lower manifold and send that whole piece with the carb on it as it came off the car. No emulsion tubes, or jets included as you'll need different ones anyway. They're easy to get online.

This carb is in excellent working condition. It was all taken apart during the winter and thoroughly cleaned, adjusted and reassembled.

I should also mention that the manifold is for the 6-port N/A 13b out of a 2nd gen rx7.

diabolical1

iTrader: (3)

sounds like both of you will soon have yourselves all sorted out. just to clarify, i didn't mean to come off as if you MUST run direct fire to get your car running, but i figured since you're putting in a Sunbeam and will have to wire from scratch, then you might as well wire it for the upgrade from the get-go. that's all.

good luck ... and post some pics when you get a chance. would love to see your project.