holley tuning questions

[Tannerm]

Bueler? Bueler?

[Chas_svo]

Did you follow the instructions on getting the correct spring for the vacc secondaries?

I agree with Jim that you "shouldn't" have to change this, but...

Also, is the hiccup better or worse when cold or hot?

It sounds like you're really close.

[Tannerm]

I am very close. But I haven't touched the secondary spring. It works best when its warmed up.

[dumpycapri85]

Tanner , is it possible that the cough is related to the electric choke not being open all the way until the engine is warmed up ? Any carbed car will act a little funny when being hammered if the choke is still not open all the way .

[Tannerm]

Tanner , is it possible that the cough is related to the electric choke not being open all the way until the engine is warmed up ? Any carbed car will act a little funny when being hammered if the choke is still not open all the way .

Not sure. It idles down when I pop the throttle. I don't believe its staying open. But what do I know!

[dumpycapri85]

Loosen the 3 philips screws on the side of the choke and turn it in the lean direction (little arrows printed on the side) till the choke flap is 100 % vertical . Tighten the screws and take it for a ride . Report back .

[Tannerm]

Turned choke to the leanest hashmark. Cracked it up. No choke to keep rpm up but it stayed a steady 800rpm while I washed it. Then drove it. Still hiccups. No change...

[Tannerm]

And did I set the secondary transfer slot adjustment right? I turned screw in 1/4 turn. I noticed that my idle screw won't go any further out. It still idles around 800-900. But my main concern ATM is this damn hiccup. Runs fine otherwise.

[bigminz]

Hiccup is normally a lean condition on transition.

[Tannerm]

Hiccup is normally a lean condition on transition.

OK walk me thru a proper transition slot adjustment. I followed the holley basic print off in that rebuild kit. Said to turn the screw till it no long touches. Then screw back in till it touches, then go a 1/4 turn further.. I do this. U can't see the slot with this adjustment. But, the car idles at about 950 now and the primary idle screw is backed out as far as it'll go.

[dumpycapri85]

Reasoning would say that it needs to be backed down so the idle screw can do its job . If you can get it to idle at about 700 with the screw not touching you got it perfect but I would try to make it so you can go up or down with it at will to vary idle for conditions .

[bigminz]

OK walk me thru a proper transition slot adjustment. I followed the holley basic print off in that rebuild kit. Said to turn the screw till it no long touches. Then screw back in till it touches, then go a 1/4 turn further.. I do this. U can't see the slot with this adjustment. But, the car idles at about 950 now and the primary idle screw is backed out as far as it'll go.

if it's still idling that high it is still getting a lot of air obviously. of course you know that and are asking how to correct it. that can be tricky on different setups. ideally the basic setup holley sends works well but with different vacuum to the plenum this can change a lot.

the easy answer is that it is not adjustment that is effecting this hiccup but rather the need for a larger secondary discharge nozzles or a more aggressive accelerator pump cam.

you mentioned idle air screw adjustment in your first post. adjust those to the highest vacuum which will get you the lowest idle speed normally. this can help with transition as well

[jyro]

I know it's confusing, the idle speed screw adjust the butterflys stop position and should control the idle speed and the 2 idle mixture screws in the primary metering block adjust the idle fuel mixture.

If you have the idle speed screw all the way out and you still have 800 rpm idle, it's one of a few things-- a vac leak on the intake or carb base, someone drilled out the primary butterflys or the stop screw for the secondary butterflys is holding the secondary butterflys open.

What part of town do you live in?

http://www.google.com/imgres?imgurl=...ed=0CEYQ9QEwBQ

https://www.google.com/search?q=holl...tm%3B500%3B375

[jyro]

it's not a double pumper

the easy answer is that it is not adjustment that is effecting this hiccup but rather the need for a larger secondary discharge nozzles or a more aggressive accelerator pump cam.

he posted a picture of the carb

[jyro]

you do have a gasket under that heatshield plate right?