robs_seven

iTrader: (1)

Well i have streetported 12a with RB hiperf exhaust and streetport intake with 465 cfm holley. im running 4 psi deadhead with the lightest secondary spring. the holley came with .050 jets but i just got from summit .048, .046, and .044 jets to play with. here is the problem i just put in the .048 jets and have the idle mixture screws one turn out. i can get it to idle no lower then 1250 and also once it idles nicely and sounds good i rev it and once the rpm drops it chokes out and dies like its loading up, but if i tap the gas it equilizes and is ok. any suggestions. im thinking about throwing in the other jets, or changing the secondary spring??? dont know i just want it to idle nice and rev smooth but not die after a hard rev. well here is a pic of the leading 1 plug, i think its rich?



need to get it right with out leaning it out to much

thanks

84stock

iTrader: (5)

Sounds like a float adjustment issue, do you know how to do it??

robs_seven

iTrader: (1)

yes the floats are good. they are just where racing beat specifies. the floats are set to where they just come up to the threads on the sight plug but dont come over

diabolical1

iTrader: (3)

what plugs are you using?

where is your timing?

mustanghammer

iTrader: (3)

Rob,

Your car is dying after you rev it up because you are running out of gas. Your fuel pressure setting is too low. 4PSI is not enough for a holley. They like to run at 6-7PSI. Did you install a Carter or Holley pump to match your carb installation? I prefer the Carter 7SPI street pump over the Holley - much more reliable.

I too would suspect float level as a problem as well. The base line setting should have the float resting perfectly level when the bowl is inverted (fuel bowl off the carb). From that point - with 6-7PSI - the gas should rise to the bottom of the site hole in the fuel bowl when the pump is running and the car is at normal idle. You may have to mess with the float adjustment to get it there but a good static setting will get you in the ball park.

The best way to monitor and set float level in a Holley is with a set of Moroso clear fuel bowl plugs. Once you get the floats set, rev the motor and watch the fuel level in the bowls through the clear site plugs. It should not drop much at all. When you have the floats right you can reinstall the brass holley site hole plugs and keep the Moroso plugs for tuning.

The high idle speed sounds like a vacuum leak or the curb idle setting on the primary butterflys is set to high. Are the primaries open when the car is idling? They should not be. A Holley has an idle circuit that supplies emulsified fuel to the engine so the primary butterflys can remain shut at idle.

The jets and the secondary spring you are messing with will not affect the problem you have right now. They may be useful for tuning once you start driving the car. If you got the carb from RB then I think you should start with their jets, secondary spring and acelerator pump settings.

If you don't have a Holley tuning book, get one. Best 10.95 or so you'll ever spend. By the way the rules that apply to Holley tuning on a Chevy-Bubba V8 would apply on a Rotary too especially the problems you have now.

Good luck.

trochoid

iTrader: (6)

Psi is too low and you may be making up for it with too high of an idle screw set, just to get it too run. If your are running 4 psi on a Holley regulator, you are using the wrong one.

13BT_RX3

I have noticed that Holleys like their idle mixture screws set at 2 turns out from completely closed + or - 1/4 turn. If this isn't the case that would reinforce the idea of a float or fuel pressure issue. ~6psi is good.

Is that a Racing Beat modified 465?

Are you using the stock fuel pump? If so, you will need to change it.

You can get away with a pump preset at the recommended pressure, but at high RPM the lines will steal some of the pressure. You would be better off with 8 psi or more and a two port regulator on the return line.

The 8psi carter costs the same as the 6psi. Keep in mind that the Carters are loud. http://store.summitracing.com/partde...5&autoview=sku

I used an Walbro efi pump with my holley. You won't need one that is too big either because of the low pressure. These tend to be very quiet.

robs_seven

iTrader: (1)

well that is a lot to take in but most makes since. I have a Holley red fuel pump. when im at idle i have the fuel level just barely up to the sight plug threading. not sure about when reving it. Will my holley pump be enough psi, i cant seem to get it much higher then 5 or so, i have a aeromotive regulator and holley gauge?? Yeah i dont think i have a vaccum leak i just have to run the idle screw in to get it to run.

the 465cfm carb, manifold, and exhaust is all from Racing Beat.

so should i put the .050 jets back in from RB, or bump up to a .052 (had those in for a while when it was running good). Then run the psi up, have the idle mixture screws 2 +- 1/4 out and floats at idle set level with bottom of sight threads. i will try tonight.
thanks for all the input and help just did not realize all this.
thanks robert

robs_seven

iTrader: (1)

Brand: Holley
Product Line: Holley Red Electric Fuel Pumps
Free Flow Rate: 97 gph
Maximum Pressure (psi): 7 psi
Inlet Size: 3/8 in. NPT

thats the pump i have

13BT_RX3

It would be best to get the idle circuit working correctly before adressing jetting changes. The 1250RPM thing...needs to be fixed. Your pump should work well. What is PN# of the regulator? How is the regulator setup?

robs_seven

iTrader: (1)

AEI-13205 from summit

Pressure Range (psi): 5-12
Regulator Style: Non-return
Regulator Location: In-line
Boost/Vacuum Reference Port: No
Gauge Port: Yes
Mounting Bracket Included: Yes
Fittings Included: No
Rebuildable: Yes
Inlet Quantity: Single
Inlet Attachment: Female threads
Inlet Size: 3/8 in. NPT
Outlet Quantity: Dual
Outlet Attachment: Female threads
Outlet Size: 3/8 in. NPT
Regulator Material: Aluminum
Regulator Finish: Clear anodized
Quantity: Sold individually.

it is mounted on the firewall right behind the carb. its also got a holley fuel pressure gauge in it on the front port. as far as the jetting goes im going to put it back like it was from rb with the .050 jets.

So what do i do now? do i increase the psi? its like the floats are emptying out and not filling quick enough or somthing. cause when i rev it fast it hesitates and when i go smooth its fine. then when i get out of the gas completly it decrease to idle then dies. is that a symptom of the floats not filling??
thanks for the info

bad 83

iTrader: (3)

Holley Intake System Kit (Street Ported Engine)*
1976-85 12A Engine

The Racing Beat-modified Street Port Holley Intake System Kit includes the same basic components as our non-ported engine Holley Kits; however, the specific modifications to the carburetors are significantly different. Headers must be used with these street port intake systems to achieve maximum horsepower gains.

The carburetors and manifolds used in these Holley kits are also available separately in the “Holley Components” section. Also see the “Intake” section for other related intake components.

Note: Installation of this kit requires use of a high performance fuel pump delivering 6 psi @ 20 gph.

I ripped this from Racing Beats website.

mattreeve

Did you evr get the carb running? i think im having the same problem.

robs_seven

iTrader: (1)

Well since you asked i figured i would update on this. Just got everything back together and so far so good. I have only driven it for a few miles and not checked the plugs for rich/lean issues. As far as the bucking i did not notice it but time will tell. It idles nicly at 1100 rpm, once i punch the gas from low rpm it has some hesistation but not bad. i will post again later

robert

bad 83

iTrader: (3)

Somedays you just want to set 'em on fire! I hope that week I've spent rebuilding this SA carb works out for me. Rob has had other issues going on with carb on his car. Sometimes you have to strip 'em down and let 'em soak in carb solvent for a couple of days to get all the trash out. Moma said "carb tuning is the debul"!

robs_seven

iTrader: (1)

Well i just went through .048, .050, .052 and still im lean, after running around the block im lean. Well as far as the driving its nice, repsonsive, nice idle, and lots of power just the plugs are a little whity. its not as bad but its still leaner then i would like

bad 83

iTrader: (3)

Pull a plug, and put a pic up. Let me see!

swbtm

iTrader: (2)

sorry to bring this back from the dead, did you ever get your problems worked out?

I'm running almost the same setup that you have.

wankel=awesome

You dont have to have a 6 psi pump for RB holleys....its recomended, yes but I'm running a stock fuel pump, and stock exhaust manifold in conjunction with A seasoned holley 465...(not sure if its RB) and with alll new gaskets, static float and idle screw tuning and mine started right up. After quickly setting choke and on car carb adjustments it ran fine but with the above stated off idle hesitation.


Guess what? PUT ON THE GODDAMNED BROWN PUMP CAM! The white one thats on those carbs is a bit small...not enough duration. with this $20 mod mine runs like a pro. And does nice smokey burnouts

swbtm

iTrader: (2)

Holy crap! You just made my day!!!!

I've been messing around with my accelerator pump for a while now, adjusting little by little but i'm still leaning out too quickly. When I asked the guy at racing beat about using different cams he just said that he'd never heard of anyone doing that!!!

ARG!

I'll go buy a set and start mucking around, i'll start with your suggested brown one and hopefully that fixes her.

Pete

OneRotor

iTrader: (3)

You're not using the Holley to it's full potential then. You're using tuning to get around a big problem, too little fuel flow. The stock pump is barely adequate as is, and once it gets some miles on it, it's even more worthless. With a Holley Red pump, my 7 ran great with the RB 465/intake combo w/o a return or FPR. The setup will be going on my new 7 once I get everything worked out, new rear end, etc., however now I have a Holley Blue, with FPR and a gauge from Billy at ReSpeed, plus I use the factory return line for my setup. It ran great on my old 7 until I blew the motor and the car rusted out. If you have a Holley Red pump, run it returnless and tune from there.

swbtm

iTrader: (2)

can you explain why you used a return line on the blue pump and did not use it with the red?

I'm running a holley blue pump regulated down to 6 psi