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Discussion Starter · #1 ·
I just finished my 30k service

I just finished my 30k service, and the timing and carbs were set up tonight. At least that is finally done. It all came out OK (except below) and I'm pretty happy with my first major work effort on a Ferrari.

It idles pretty good, but the 5-6 carb is making an intermittent spitting/ticking kind of noise. It's not constant, and only happens at idle. I drove it around the block to make sure everything was OK, an only heard the noise at idle.

Note that the air cleaner assemble is not back on yet. It was easier to adjust things with it off.

Also, I wished I'd know about the Exxon Valdez effect on my garage floor when the dist. are lose and you're setting the timing. Ugg, what a mess that was.
 
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Discussion Starter · #2 ·
Sean,

Usually, spitting bac


Sean,

Usually, spitting back thru the carb indicates:

-A lean mixture
-Throttle shaft leakage
-Tight intake valves

Note...Sometimes, even when all is set correctly, an occassional spit back thru the carbs (random barrels) is normal...

Regards,
David
 
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Discussion Starter · #3 ·
Mine too. Mostly at an idle an

Mine too. Mostly at an idle and more so when cold.
I'm looking at rebuilding the carbs next winter. Saw some shrunken gasket material impinging into the venturi bores.

Just did a dyno session a couple of weeks ago and the air/fuel mixture was 14.5. A bit too lean. Exhaust is Ansa, no cats. I will try some rejetting also.

DJ
 
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Discussion Starter · #4 ·
A color Tune can be a helpful

A color Tune can be a helpful tool for sorting Carb idle issues. The spitting is indicative of a miss...could be several reasons for a miss both lean & rich.

Regards, JRV
 
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Discussion Starter · #6 ·
I would blow out the idle jets

I would blow out the idle jets and take a colortune to it as JRV suggested to see where you are. Otherwise, its hit and miss, unless you have a lot of experience with webers.

Good luck

Drew
 
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Discussion Starter · #7 ·
We talk alot about Exhaust Gas

We talk alot about Exhaust Gas Analyzers here however, with Multi Carbed engines even a gas analyzer is not always enough to see what the REAL ISSUE is...

A Color Tune allows one to see "individual" cylinder running conditions. Once an individual condition is defined, then what to do about it becomes more clear.

I still use Color Tunes to this day when I have an issue that goes beyond simple adjustments.

Regards, JRV
 
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