Bought a three Rochester/Edlebrock setup had it up & running & thoughtn I just needed to work out some of the details. But yesterday I drove about 3 miles to meet with a friend for about two hours. Ran great going, coming back it was missing and trying to die when I gave it gas. Once I limped home & checked things out it is like too much gas is coming in & flooding. It was late last night & just had time to check the choke this AM & it was fine. I will check timing electric connections etc. When I get home from work but kinda feel at a loss. Any ideas would be greatly appreciated!!!!
I had a problem with the secondaries flooding on my Rochester set-up. The needle valves would stick on one or both. I put a seperate Ford screw-in filter on each carb. That helped some. Also , as has been posted, the fuel pressure is critical. -Jim
Looked at summit see some regulators as low as 4 but not 2-3. Any suggestions? Spoke too soon sorry!!
bought a pressure gauge and tested out my pump and read 3.5 psi So not a fuel pressure problem..... re-did fuel air mixture - all in & then 1 1/2 out better but not quite - dark and tired try more tomorrow - double check timing and probably go a bit richer on mixture. Looks like I may be starving for fuel not flooding??? What I do not get is why it was running well or close and then suddenly went bad - may never know..........
Are you saying that all 3 carbs have idle mixture screws? They shouldn't. Only the center carb. The end carbs need to be altered to work as dumpers when the linkage calls for it. The end carbs need a separate return spring to prevent them from opening when you are cruising on the center carb.
Ditto! No idle mix screws in the end carbs and an extra spring to hold them closed until the linkage ( center carb 40-60% open ). This ***umes you have progressive linkage; I've not used them not progressive.
As said before..Idle mixture screws only in the primary center carb..that said turn them out 3 turns from lightly seated , start car , allow it to warm up. than make sure your choke is fully off once to temp start screwing in the idle mixture on one side till the engine starts to pick up a little RPM..than turn it back out about 1/2 a turn..do the same to the other screw. be sure the end carbs are shut down completely and not allowing the engine to **** air thru them..if they are ****ing air, they will create all kinda of problems for you..mostly vac. problems. there is a standard way to set these tri powers up..way too many words to type here. educate yourself on them as best you can.. and ****ster (hamb name) is a good guy to learn from
I'm always amazed at how complicated people think tri powers are--basically they are just 2 end "dumpers" with a stock carb in the middle operating like a stocker. That said, the two ends should have no idle jets, guts, etc.-just thicker ****erflys (like the factory) for better vac. sealing. To set them up, block off the ends with a plate vacuum tight, get the center running perfect, then put on one dumper at a time and check for vac. leaks--always the biggest problem. That's it, no big deal. BTW, might want to check Vintage speed for their bases, they work great. Had mine for 2 years now, perfect every day. cooger
set up is basically from Vintage speed via another vendor. There are only idle air mixture screws on the center carb. The set up is brand new so the carbs are all set up the way they should be. All was done as describe above (with end carbs on - but maybe I should try the block of plates!) including setting the air/fuel mixture and it was running well except for some pinging (which 91 octane helped). The other night however I started to have problems where it was stuttering and missing at 1.5K rpm - I thought it was too much gas, but it may be too little - I will keep messing with it.....
Make sure you have a return spring on the end carbs to close them down. Make sure the end carbs close all the way and are not being held open by the idle screws. It sounds like they were open slightly giving you a studder.
The block off plates will tell the tale. Again, put one on at a time, pull the bflys hard shut, see if it misses. If so, spray some carb cleaner in the end carb, if it speeds up, you got a vac. leak---probs. with the bflys sealing or misaligned. cooger
by any chance if you look down any of the carbs are you dripping fuel out any of the venturis?? I had this problem and it was one of the idle bleed off holes..plugedd with ****.... So it was causing a siphon affect...
Have you done your ignition/timing check yet? As a general rule, Rochesters have no personality. If they work, they slowly fail (over years, not minutes). On the other hand, electricals DO have a personality. Jon.
I had a flooding problem on a tri power . you might check for a pinhole in a float . I had a float sink , had lots of black smoke.
Timing is good double checked last night. Also double checked connections to the coil (it is new). By ****erflies I am ***uming the above posts mean the throttle valves in the bottoms of the carbs - the two outside carbs have no chokes. From visual inspection they look to be seated (but I do need to try the starting fluid/vacuum test). Pulled a spark plug and it is black which I think confirms my too much gas thoughts. Thanks everyone for your help!! Wondering if this is beyond me.... may start looking for help from a shop?? Will check my fuel filter and replace - are there filters at each carb fuel line connection. Oh also disconnected linkage to outer carbs - still getting hesitation - idles like a champ.........
Fixed was not a fuel problem was a loose wire to from the distributor to the coil which I also had just replaced. Just started problem solving other stuff and found the loose wire. Back to where I started - yeah - but getting some pinging at higher rpms 3K Not sure what motor I actually have so can not be sure exactly where my timing is supposed to be.... have it 8 degrees advanced, will retard it a bit and see how that does.
Got a chuckle out of this comparison of carb problems and electrical problems. Couldn't have said it any better! For a CarbKing you sure know your way around an ignition system.
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