jshook82

iTrader: (5)

I've been working on this car for a while and i got her running noticed that i was 45 degrees retarded adjusted it about 22 degree-ish advanced at 3000-4000 rpm and then the coil for rotor two went out. The car sat for about two weeks, replaced both coils with MSD Blaster 2s and wires, plugs (all four NGK trailing for a REPU). No dice, didn't start. I pulled the lending plugs and the were completely soaked with fuel. I pulled the rest of the plugs and cranked the motor until it stopped "mist-ing". I let the car sit for two day with the plug out and tried again, Nothing. So i figured that the motor has "fuel washed," What i mean by that is, I thought that there was so much fuel inside the motor that it had washed the oil from the seals and subsequently creating low compression. So, i put 5 cc of Marvel mystery oil into each rotor housing and spun the motor by hand and then by the started, spark plugs out. I put it all back together and she fired up first time. Warmed the car up to operating temp and drove the car around the block, ran real strong pulled hard in each gear, came back, checked the timing and fuel pressure, everything was in order and running good. Turned the car off, let it sit for about 20 minutes and nothing, doesn't want to start.
So, Being that I am using a dellorto tuned for a 13b, is there so much residual fuel left over that its killing the compression?
Or does any body think that the motor is toast?
All of the problems started after I adjusted the timing from 45 degrees retarded.
It also could be that the car is low on fuel and I'm parked on a hill, but i don't know.

What are you thinking because I'm plumb out of ideas?

pinoyremix

so...since you said your running a dell 48 tuned for a 13b that is your problem...the jetting is off your idle jet holders are making it run way to rich and flooding it on the idle cycle...i have a thread that compares

https://www.rx7club.com/1st-generation-specific-1979-1985-18/dellorto-48-dhla-swap-13b-12a-not-56k-friendly-773154/

t_g_farrell

iTrader: (1)

Yeah I would say its flooded again. I've found that cleaning the plugs with brake
cleaner does wonders for fixng the fouled plug issue.

You didn't mention what your using for the fuel pump or pressure. Along with the
13B jetting these could cause flooding on shutoff as well. This site can help
you out a lot http://www.gruntled.com/Dellorto

broke7

iTrader: (1)

post your jetting and your timing also doesn't sound right. I will have to check my notes

jshook82

iTrader: (5)

I am using a Walbro 255 inline with an Aeromotive 13301 regulator and a 1-15 psi Aeromotive pressure gauge set at a steady 3 psi.


Main jets are 230 and idle jets are 75. i know that the 230 were perfect for the SE i was running the carb on before, to keep a 12:1 Air/Fuel ratio. What would be the best main jet size for a 12a?

jshook82

iTrader: (5)

So i just read the write ups on the 12a and they are the same as the 13b. When i tried to get the 13b passed emissions i had to go down to a 180 main jet, but if the carbs are set up the same from RB and in my carb i have all the same parts, that should, logically, cut the carb from the equation in the regards of "improper jetting," yes?

t_g_farrell

iTrader: (1)

They aren't the same. Look at the idle emulsion tube number and the AP pump jet size.
Its larger on the 13B and then theres the emulsion tube difference. These will
both add up to an over rich running on a 12A. Thats why at WOT it seems fine
because at WOT the jetting is the same. Unfortunately you hardly ever drive at WOT
and so the idle circuit is critical to your DD experience.

t_g_farrell

iTrader: (1)

Try dialing it back to 2.5 psi. That seems to be the sweet spot on mine. A 1 - 15
psi gauge will only be really accurate between 5 and 10 psi. I use the gauge to
get in the ballpark and then use my ear to hear the engine idle bump up when it
starts to overwhelm the needle seat. Then I back it down a bit until the idle goes
back to what it should be. On my 1-15 psi gauge it shows anywhere between 2
and 3 for the sweet spot.

jshook82

iTrader: (5)

Ok thanks.