bkm_rx7

Okay, so i finished my dual leading ignitor direct fire ignition system last night, then cleaned up all the wiring on it today and mounted the coil. I also put on my racing beat customizeable headers. ALSO, my jets FINALLY arrived! This planted false hope in my head as i pulled out my old .56's in the primaries and put in some .70's.

I went ahead and fired up my 1/2 bridgeported 12a, and omg was the sound deafening due to the headers. I, once again, used oil in the carb to get it started. It seemed to run a little bit better, but still not satisfactory by any means. The car ended up dying when i tried to let it idle...weird. So i figured i'd try and fire it up again, but got nothing. So i tried a little bit of oil in the carb again, because surely that would work. Once again, nothing. So then i pull my plugs cuz they are surely fouled, and they were. So i replaced them with BRAND NEW NGKs, but that still made no difference.

Will somebody please tell me wtf is wrong with my car??? Im so worn out on this whole project and i really need a car. This has been goin on ever since i put the engine into my car. If you dont already know what my setup is, check my sig. When my car does run (rarely), it runs very ratty and does *NOT* like low rpms (anything below 3k).

Also, is there such a thing as TOO GOOD compression? I mean, if the tension bolts were overtightened would this cause the engine to have too much compression? I know as well as you can without a compression tester that my compression is pretty damned good...

ANY AND ALL HELP IS APPRECIATED!

79+80+84_rx-7

is that a generic carb?

I believe you need a one hole spacer for everything to work correctly...


EDIT: I think it was actually, each set of primarys and each set of secondary's see the same vacuum... I cant remember...

mcnannay

no, i doubt too high of compression would hurt anything, or cause it to run bad, thats just ridiculous. You may think about trying a different carb, obviously mine isn't doing anything at the moment, so you might give it a shot, you got nothing to lose. Put a timing light on your plug wires and make sure all of them are firing.

Your carb has never run right so id suggest trying mine out and see what it does, see if it will idle. Let me know man.

jays83gsl

It's your muffler bearings.

That or your head gasket was applied incorrectly.

Is your exhaust built specifically for a bridge port? Did you use the 1-peice Apex seals?

bkm_rx7

Ok...this is a generic carb...holley 600...does *NOT* have secondary jets...idk how it works exactly...but it lacks them...anyhow...could you explain the one hole spacer better??? (i dont know whole lots about carbs...)

79+80+84_rx-7

https://www.rx7club.com/showthread.p...ht=spacer+carb


I dont know much either....

I would talk to peejay to see what your carb problem is...

Kentetsu

When its turning over, but not starting, does it smell like fuel?

Rogue_Wulff

I don't about the "one hole spacer", but the holley 600 you are reffering to uses a metering plate for the rear, rather jets. Likely not going to work very well on most applications, due to the lack of "Tuneability" without the rear jets. Of course, these also have the worst vacuum secondary setup of any holley, making the rear barrels almost useless without the "Screw trick". Others who have messed with these carbs will likely understand the "Screw trick" part

mcnannay

screw trick meaning mechanical secondaries. and yes without the spacer im pretty sure the stock holley wont open the vacuum secondaries, thats actually what rb modifies for them to work on their systems. Although IIRC even the rb holley has the metering plates instead of jets. And the metering plates can be changed out. If you are looking to be able to tune them more precisely there are a few aftermarket companies that make conversions for the metering plates so that you can use holley jets in them.

mcnannay

ignoring the first two remarks

the exhaust isn't built specifically for a bridgeport, but thats only good for squeezing out a few extra ponies, and will have nothing to do with how well the engine runs. And as far as 1-peice apex seals, they aren't necessary on a 1/2 bridge port, thats one of the benefits of a half bridge, you dont have to buy the expensive 1peice seals.

Eatdust

I would hate to antagonise you further, but..........To me it either sounds like a fuel or timing issue.

Have you checked your fuel system - ie pump, filter, fuel level, etc...
I would start by just disconnecting the fuel line and checking the flow rate. Then check the pressure. Is the carby new or been used recently? If not did you rebuild it before you stuck it on the car? Some of the internal fuel passages could be blocked.

I am not sure how a holley (is that what you have?) works but could the idle mixture/circuit be set too lean?

Check the timing as this has a huge effect on how it runs.

I feel for you - it's a terrible thing to have your pride and joy act like a temperamental woman.

Cheers,
Eatdust

jays83gsl

Yeah, McNannay, I'm well aware that every single thing I posted there was complete B/S

mcnannay

its ok, im getting used to it

jays83gsl

Barely now? Most people were used to it by my fifth post, lol.