Holley problem continues

[Jeanyus]

I fianally had a chance to take my boat out, and again it ran bad, The hole shot was not to bad, but misfireing at the top end. I was only able to get 5200 rpms, I was running 5900 with holley 600 vaccum secondairies.
Here is what the plugs look like.
In this picture the back of the engine is on the right.
http://www.hotboatpics.com/pics/data/500/5859plugsdriverside.jpg
The back of the engine is on the left
http://www.hotboatpics.com/pics/data/500/5859plugspassenger_side.jpg
I noticed that the plugs in back are cleaner than the ones in front. What does it all mean ?
I put a vacuum gauge on
http://www.hotboatpics.com/pics/data/500/5859vaccumgauge.jpg
and at 3000 rpms I have 11 inches of vaccum. The power valves are 8.5.
In case you forgot I'm running a 10 to 1 427, with tunnel ram and 2 holley 6109 carbs.

[cyclone]

were the plugs brand new? If not then put a new set in and go run the boat wide open and shut it down as quick as you can without letting it idle for a long time. Pull the plugs and look at the base of insulator. You should see a light tan ring. The position of the ring will tell you if that cylinder is running rich, lean or perfect.

[steelcomp]

what are you running for ignition??
Cyclone's right...after all the fuel problems you were having before, you probably have fouled the plugs. You had one carb giving you problems before, and I'd bet that's where the dark plugs came from. Get a new set. Didn't you say that before, you had hit 6000 with these carbs?
Also check your timing. No less that 36 with your set up, and premium gas.
I'll give you a call today.

[Moneypitt]

If its banging and popping in the exhaust at the higher Rs, it is likely too much fuel. More fuel than you can burn, so it fires in the headers/exhaust system. What changes were made? same carbs???????.......MP

[Jeanyus]

I made a wot throttle run, then ideld in (or tried to idle, it was chugging at this point)
I'm pretty sure the plugs were fouled Saturday. I had the plugs out before I ran it and they looked like good clean plugs.
I ran 3 short passes, and it got worse each time.
The carb that was giving me trouble, is now on the front. I switched them because only this carb had a threaded plug for a vaccum port.
http://www.hotboatpics.com/pics/data/500/5859vachose.jpg
I just got this on e-bay
http://i21.ebayimg.com/02/i/04/82/61/5e_1_b.JPG
I'm going to put the 850 back on
http://www.hotboatpics.com/pics/data/500/5859torker.jpg
,new plugs, and see if it's me, or these carbs, that has a problem.

[DeputyDawg]

In my not so humble opinion those single top tunnel rams don't work worth a shit, don't put it on. The 6109's are awesome tunnel ram carbs, you just have something wierd going on but it can be fixed I'm sure. Has anyone ever modified those carbs or baseplates in any way from the way they came from the factory?

[DeputyDawg]

Are the floats in good shape i.e. no leaks that would keep them from floating. How much fuel pressure are you running?

[Blown 472]

First off ditch those autolites, they suck. Looking that the end of the threads looks like they got a lot of gas and could be fouled, you have the right heat range plugs in there too?
A little something to ponder..............
http://cochise.uia.net/pkelley2/sparkplugreading.html

[steelcomp]

Ron, just put new plugs back in and run it and see what happens. How hard can that be? That single TR top isn't going to work worth a damn. They have terrible fuel distribution problems. If you're not going to follow through with the Holleys, then put the single four intake back on and be done with it.

[steelcomp]

First off ditch those autolites, they suck. Looking that the end of the threads looks like they got a lot of gas and could be fouled, you have the right heat range plugs in there too?
A little something to ponder..............
http://cochise.uia.net/pkelley2/sparkplugreading.html
I've run Auto's forever, and never had any issues with them.

[cyclone]

I like Denso plugs but if you dont want to drop the cash for a set of Iridium plugs then I like Autolite AR3933's. great plug and they dont cost a ton of $$$$

[Blown 472]

I've run Auto's forever, and never had any issues with them.
I have had nothing but trouble with them, IMO they suck.

[cyclone]

What kind of trouble blown?

[Blown 472]

What kind of trouble blown?
I bought a set of the "race" plugs same heat range as what I have in the car now and they fouled mind you the car was running fine just thought I would try them.
Had a set in my boat and they ran like shit, foul out easy. Put a set of motorcraft in there and worked just fine, and I know they are made by the same company but they never seem to work in my fords and mopars.

[Jeanyus]

In my not so humble opinion those single top tunnel rams don't work worth a shit, don't put it on. The 6109's are awesome tunnel ram carbs, you just have something wierd going on but it can be fixed I'm sure. Has anyone ever modified those carbs or baseplates in any way from the way they came from the factory?
The carbs have been modified, choke horns removed. I don't think anything else has been changed.
http://www.hotboatpics.com/pics/data/500/5859nice750.jpg
I have never checked to see if the floats are good. How do I check them
Are AC plugs any good?
I have 7.5 lbs fuel pressure
I had this tunnel ram with single top, same 850, same heads and cam, on a 9 to 1 454. I turned an A impeller at 5200 RPMs all day long. Didn't have gps back then so don't know how fast the boat was. But I forgot how gay a tunnel ram with 1 carb looks.
http://www.hotboatpics.com/pics/data/500/585973southwind.jpg

[steelcomp]

Other than the air horns, I believe the carbs are stock. I didn''t see any internal mods.

[DeputyDawg]

The easiest way to check the floats is while they are out of the carbs. Just put them in a pan or metal bowl of gas or carb cleaner and leave them there for 10-20 minutes, if they are still floating on top when you get back they are okay. Sometimes they can get little holes in them and they won't fill up real fast but they will start taking on fuel after a little bit. When this happens they can't float up high enough to shut off the needle and seat. Have you checked to see if the needle and seat are sealing good? If a float gets a little gas inside of it it can bonce up and down especially in a boat or off road vehicle and cause all kinds of chase your tail problems. You might also try calling Braswell at 520-579-9177. They know those carbs very well and are usually very helpful on the phone.

[Huffer]

LOVE MINE,RAN THEM FOR THREE YEARS IN MY BLOWER MOTOR NO PROBLEMS!!!

[Squirtin Thunder]

So what is the out come of the carbs ??? Are they working right or are they .........................????

[steelcomp]

Hey Jim,
I'm wondering why you've posted this same question theree times in the last three days?? I'm thinkin anyone who cares saw it the first time.
Must be the heat. :messedup: