T_Racer

iTrader: (1)

So I was reading all of gruntled.com, and came across an interesting piece of info. It says that the instructions from racingbeat do not use the vaccum advance with the Dellorto system.
Now I know that RB recommends advancing the timing 2*, but it seems weird that it would use no advance. I am an ingition idiot, so someone tell me why this is, just so I have yet more useless knowledge. Can't wait to get the carb here and get it on and running.
Also, where on a dell does the oil injection inject at? is it in the float bowls, or in the intake manifold. I am not sure if this is a RB dell, so may have to tweak it some, emulsion tube, accel. pump gasket, etc.

Travis

T_Racer

iTrader: (1)

Come on, you guys are all smart, anyone? Buller, Buller?

Cheers,
Travis

Sgt.Stinkfist

iTrader: (6)

vacuum advance changes the timing very little on the leading ignition(where it counts) but even w/ the vac. lines disconnected, you still have the centrifugal advance inside the dizzy doin its thing. When i bought my sidedraft carby from RotaryShack, Robert told me to leave my vac. advances disconnected. as for the oil metering lines, im not sure about RB's dellorto set up, but my manifold has 2 little ports for the OMP lines. If the dellorto manifold doesn't have the ports(ill bet it does), you could bypass the OMP and just run some premix in the gas. good luck.

speedturn

iTrader: (1)

The Mazda distributor has vacuum retard (it was made to get a signal only at very certain throttle settings with the factory system, and you no longer have a factory system.) If you hooked the distributor vacuum line to your DelOrto manifold, then you would be retarded at light throttle cruising, or you would have too much spark advance at full throttle wide open (which would cause engine destroying detonation.)

So leave the vacuum line disconnected from the distributor. You must ensure that you reset leading spark timing to 24 deg advance at 4000 - 4500 steady rpm.

T_Racer

iTrader: (1)

I am not looking at the car right now, but I know that with the Dell system, I am supposed to advance the ign. 2*according to RB, how do you adjust the advance? I am sure it would be in the Haynes, but don't have it here right now. Thanks.

Cheers,
Travis

Siraniko

iTrader: (13)

http://personal.riverusers.com/~yawpower/pultime.html

Midwest 7's

iTrader: (4)

heres some pics of a true rb dellorto.
note the omp inlets and the thick spacer for the acc. pump gasket.

T_Racer

iTrader: (1)

See, it is helpfulness like this that makes it a joy to oen and repair your own rx7. Thanks a lot, I will probably start tearing into it this afternoon, getting it prepped for the Dell. You know, since I just got it running good after a fuel leak fix and new exhaust. Can't let it be one way too long, like a week.

Thanks a ton,
Travis

T_Racer

iTrader: (1)

OK, so I called Racing Beat to see if there was any chance of any Dell stuff laying around. Told that "the information was locked away in engineering, and any parts left were likely destroyed for proprietary reasons." Well thanks a lot, I will go kick my dog now.
What I am wondering is this. I have read over and over gruntled.com, a great Dell source. Midwest, your pics really helped me out. I guess I will try to mod the accel pump per the site to see if I can make something work. What I was wondering was if anyone with a RB Dell had one apart that was cleaning it and could tell me how many holes in the emulsion tube. I know that RB modded the emulsion tube to lean it out a little. I will be using their chart for jetting, but just hoping to mod my own to make this part be more in line. I am new to sidedrafts, well carbs in general. I got the Nikki to work good, after rebuilding it and tinkering with it. So I am not afraid to get in and start working on it, but would like to start from a known starting point.
Now, if anyone has some advice, like shut up and just check on the jetting, then worry about the emulsion tube, then I will listen to any and all advice.

Travis

Siraniko

iTrader: (13)

Try Rivera engineering @ Santa Fe Springs CA. IIRC, they supplied them dellortos to Racing Beat or at least, they modified them.

Midwest 7's

iTrader: (4)

im about to rebuild mine. anyone know the best place to order a full rebuild kit?

DriveFast7

iTrader: (1)

Hi Travis, if the dell was sold by racingbeat then it has the right .8 emulsion tube. What's the metal tag on the top of the carb lid, secured by a screw? 5288 was sold by RB.

I'd pull all jets out and let us know what u got. I would seriously invest in a set of jet measuring gauges from cbperformance.com. The # on the jet is not always the size of the orifice. For example, the accelerator pump jets from the 2 RB dellortos I own are both stamped 80 but one measures size 95, other size 100.

Buy Rebuild kit from europeanmotorworks.com. They have them in stock and yes they don't just sell to VW owners.

Buy anti-vibration softmount for carb to manifold from http://www.racetep.com/avibe.html They have the proper 48mm size, just got mine delivered today.

As it turns out I'm making my own accel pump gasket (hopefully this weekend) and have the proper gasoline resistant material on the way. Normal rubber won't cut it, it'll dissolve and swell.

T_Racer

iTrader: (1)

So do you have a RB Dell,Brad? As I understand it, most have a .8 emul. tube, though I know this can be changed. But RB added more holes the tube on theirs to lean out the mixture a little more. I really need to learn more, and have the book coming from a friend, hopefully, on Webers and Dell's. If you have infact a RB Dell, could you take a pic of the emul. tube, or count the holes? I have the equipment to drill more if necessary, just need to know what to do.
Thanks, for everyone's help, if anyone has any tips or info on this, please chime in.

Cheers,
Travis