i got a question for all of you with bridge ported carb'ed 12a. how hard is it to start your car, and what's your idle set at? i'm asking because i'm looking at buying a '83 with a BP 12a. The guy that is selling it had to keep the gas to the floor when starting it, and it wouldn't run below 1400 rpm, but it had the bride port "brap brap brap" idle, and he said that he's pretty sure that it's a MazdaTrix Bridge Port.

 

bump, anyone wanna help?

 

1400 sounds about right to me. Dunno how hard they are to stars though......

 

Shouldn't start hard- maybe the carb isn't modified right for a BP.

Idle should *** around 1100-1400, with a heavy lope (brap-brap).

And I wouldn't count on the BP as being a Mazdatrix. Maybe a Mazdatrix template.

Sounds like the intake is out of whack.

Keith

 

how do you modify the carb for a BP? he said that it's a holly off of a '50's licoln (the car is a huge hack job)

and why wouldn't it be a mazdatrix motor?

 

My 12a full J bridge, cut into the water seal, starts right up. The fuel enrichment circuit on my Dellorto needs to be turned on when cold. Once warmed off I turn off the FEC.

Idles @ 1800rpms which is typical of that port. Less bridge, less overlap, less idle rpm.

A 50's Lincoln carb? What? God I hope it's at least a holley.

 

that's what he told me it was from. it's a Holly 4 barrel, and when he starts it up it belches smoke black, gas smoke constantly. it's running pig *** ritch. i'm going to go and drive it tomorrow and see how everything runs. I knew that it was running really ritch when he told me that it was a bridge port and he could only keep up with another '83 with 75k on it and it was all stock.

 

Pretty much any carb that wasn't meant for a rotary will need extensive mods to run right (smooth) on a rotary. Hench why the carbs are so expensive from Mazdatrix and RB.

He'd be showing you a reciept if it was Mazdatrix motor, and if it was, It would most likely have an appropriate carb on it too, not one off a 50's lincoln. If he's too cheap to buy the right carb, he sure as hell wouldn't drop the money for a new Mazdatrix BP motor.

The engine might be fine, but the intake is most likely whats F'ing everything up.

Just my .02 cents.

 

he said that the guy that had it before him put in the BP 12a, but the carb awas all f'ed up when he got it, so he bought this one, and it was a Holly upgrade for a '50's lincoln, and it was a spare carb that the auto parts store had laying around. I'm trying to get ahold of him so i can go and drive it and probably buy it. If i do, then i'll look at how much a carb from MazdaTrix or RB, and determine whether it'd be better for me to go with that or just save for a year or so and do a TII swap. This isn't going to be my DD, it's going to be a project car (seeing as how it needs to be almost completely rewired, suspension work, and body work), so having it run all the time isn't very important right now.

 

My BP idle at 2000rpm anything less it wouldn't stay running, start right right up no problem