Too rich.

[Animal]

Had a 440 rebuilt, ross pistons , performer RPM intake , Crower cam, intake duration 294, lift 509 , exhaust duration 304,lift 509.

Aluminium heads, Edelbrooke.

Crane roller rockers , 1.5 ratio, hydraulic cam & lifters.

60 thou overbore.

Mighty Demon 750 vac secondary with 1" 4 hole spacer.

TTi  headers 3 1/2 collectors with 3" exhaust.

Car runs great ,but every so often it will flood itself with fuel when ideling in traffic, foat level is set to the middle mark on the sight glass, mixture screws are out 1/2 turn on primary & secondary screws,transfer slot is within 20 thou on prim & sec.

Got the motor ideling @ 1000 revs in park, dropping to 900 in drive.

Initial set to 19* , total @ 34* all in @ 3000 revs.

Got the mopar leccy dizzy, orange box, NGK plugs 6 heat range.

Been told it may be the cam, due to the exhaust duration exceeding the intake,  causing the cylinder to fill with the spent exhaust gasses, resulting in the fuel perculating in the intake, then dropping in the cylinder.

Before I change the cam , maybe you guys can shed some light on the problem.

Have to change the oil regular, due to it getting black within 100 miles of driving.

Just changed it from an 850 double pumper mighty , which had exactly the same problem.

Goes great when you stomp on it, never a bog, nor does it miss a beat , even runs 12s.

Power valve seems fine , not ruptured & rated @ 6.5.

Thanks guys in advance.

[jg68]

Whats the dur.on that cam at 50, i have a 750 speed demon DPer & love it, but it has a lean problem, yeah lean (stumble) in the primaries, go figure, a demon running lean, well i'm sending it off to have it dialed in.

[Animal]

Don't know the duration @ 50 ,will have to look it up on the cam specs, can't get specs for a few days.

Not up on cams , sorry I can't be more specific.

Barry Grant say to lower the float level if using more so on the street ,maybe flooding itself, but when it plays up, don't have the time to pull the air cleaner & check the boosters for fuel dripping of em , as it clears itself after about 10 seconds , after I put my foot to the floor.

Done a lot of work on this motor, so it would be a blessing if I don't have to change the cam.

[firefighter3931]

Sounds like a healthy combo. Check your fuel pressure....it should be 7psi max. Have you done a plug reading ? If so....how do they look ? What color are you seeing ?


Ron

[Chryco Psycho]

Pull the intake & install a Fel Pro 1215 intake gasket to bloick the heat crossover & make sure you have a 180 or 190 Thermostat
this shoudl drop the heat in the intake enough to cure your problem

[Animal]

Motor has a 180 stat & runs @ 180 all day, plugs are light tan on the tip extending to where it just bends down , the porcelain is light grey colour & the base of the plug has soot deposits.

To be fair the motor is ideling for quite a while when I work on it.

Can't seem to work why the motor runs rich , as the mixture screws are only 1/2 a turn out ,maybe I'll turn them in a bit & see what happens, didn't want to as demon say not less than 3/4 out, but I have no problem with bogging whatsoever. Might drill the idle air bleeds out a touch & see?

I have the idle ease , but barry grant say these should only used with a bad combo, what do you guys reckon? as it wouldn't hurt to try.

The motor has a mechnical fuel pump, think its the higher pressure type.

I'll ask the guy who built the engine if he blocked the crossover or not, if not I'll change the intake gasket.

Thanks guys , lookin forward to hearing from you.

[whitehatspecial]

Do you have a manual or electric choke?

[Animal]

Don't have the heat riser on the performer.

There is no choke on the mighty.

Gonna see how it performs with the float levels set @ the minimum.

Thanks again guys, any info would be appreciated.

[jg68]

Sounds like an easy fix, larger IABs should fix the rich condition at idle, are those screw in air bleeds on that Mighty D, on my speed D, they are fixed bleeds, but mines not rich with the screws 1.1/4 turns out in all 4, try larger IABs in the front, this should help a lot.

[Animal]

Yea, the IABs are the screw in type , double checked the setting on the transfer slots & there bang on, only around 20 thou exposed.

Why the hell it runs rich is beyond me , hope to cure the problem by opening the air bleeds.

Can't start the motor as I'm waiting on some cometic rocker cover gaskets.

Been having a think about this , when the motor is ideling around 1000 revs, when I adjust the 4 corner mixture screws in or out, it makes no difference to the motor until I turn them all the way in to the stop , then it cuts out, this suggests to me that it's running on the main metering circuit. I could understand if the transfer slots were to far exposed, but there not (20 thou) can't see any fuel dripping from the boosters either.

As I said before , PV is not ruptured.

Thanks guys.

[jg68]

Yea, the IABs are the screw in type , double checked the setting on the transfer slots & there bang on, only around 20 thou exposed.

Why the hell it runs rich is beyond me , hope to cure the problem by opening the air bleeds.

Can't start the motor as I'm waiting on some cometic rocker cover gaskets.

Been having a think about this , when the motor is ideling around 1000 revs, when I adjust the 4 corner mixture screws in or out, it makes no difference to the motor until I turn them all the way in to the stop , then it cuts out, this suggests to me that it's running on the main metering circuit. I could understand if the transfer slots were to far exposed, but there not (20 thou) can't see any fuel dripping from the boosters either.

As I said before , PV is not ruptured.

Thanks guys.

If you can bring 1 mixture screw in all the way & it stalls your fine, your not idleing on the main curcuit, if it keeps running, then your in the main curcuit, but i'm guessing with only being able to open them up 1/2 each tells me you need to lean out the idle curcuit some, you can either put smaller IFRs in the metering blocks or the easy way is larger IABs so you can have the mixture screws more in the area of 1 turn out on each.

[Animal]

Just been trawling through Dons site , he was saying he once had a 750 set up with the mixture screws only 1/4 way out from stop , i have mine around 1/2, think i'll just keep bringing them in, if it starts to bog then i'll take em out back out.

Just thought if BG suggest 1 1/2 turns to baseline the carb , then going a 1/2 turn would be too lean.