13BTOY

iTrader: (1)

Guys this is really piising me off. I just swapped in an SE 13B in my GS and it sputters and backfires coming up to 6000rpm at WOT but before 6000 it pulls plenty strong? Heres the story. I pulled my carb(dellorto 48) from my old motor which reved to 8000rpm cleanly and put in on the SE motor. I was running a direct fire ignition but I switched it back to stock for now until I figure this problem out. At first I though maybe the timing was off. Timing is 0 leading @ idle and 20 trailing no vac advance. For fuel I'm using the Carter pump that I had on there before the swap along with the purolator regulator set at 5psi. Fuel filter is clean(see through) and I thought maybe my pump was going out so I hooked another pump inline to increase pressure and volume, no change so I figure its not the pump. I pulled the extra pump off that I rigged and put it back to normal(single pump). What the hell is going on? What should I check next? Coils maybe but both my tach works? I have one on leading and one trailing. Could it be the cold weather here in Buffalo? I never really drove this set up in the cold since it was on my summer car. I need HELP bad coz I'm running out of ideas.

Sorry for the long post!
Thanks, Ed
By the way is Gruntled.com down?

TyCity

iTrader: (1)

oops

79+80+84_rx-7

maybe there is crap in the carb?

check your plugs wires cap rotor also.....

13BTOY

iTrader: (1)

wires, cap and rotor is good. I'll change the plugs. What plugs should I use? BR8's or should I use the later 13B plugs 7 and 9's?

Thanks, Ed

mazdaverx713b

iTrader: (91)

are you sure you are getting enough fuel at higher rpms?

13BTOY

iTrader: (1)

I think I was especially when I had two pumps running. It made no difference so this lead me to believe that fuel is good but I guess the only way to make sure is to hook up a gauge. What do you think.



Thanks, Ed

mazdaverx713b

iTrader: (91)

i would set the regulator low and see if anything changes. i would personally replace the worn pump with a new one and get rid of that second pump.

13BTOY

iTrader: (1)

The carter pump is only 1 summer old and I only hooked up the 2nd pump to see if it would cure it. I have always had the reg. set at 5psi. Even on the old motor. I'll get a new pump anyways.

Thanks, Ed

heb09

Ok I had the same problem with my 12a bridgeport. Turns out getting different jetts solved the problem. Get your carb tunned.

Sk8r_dude

hook up the 5th and 6th ports? jks.....lol

mazdaverx713b

iTrader: (91)

what size jets are you using?

13BTOY

iTrader: (1)

I'm not messing with my jettings. This carb is tuned to a 12.8 quarter so I doubt its the problem along with my 6ports. I'm going to change the pump.


Thanks, Ed