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Old 01-18-2012, 12:58 PM
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wet spark plugs

I have a 400 chevrolet small block with vortec heads steam holes have been drilled and a 750 edelbrock carbuerator, spark plugs keep getting wet, is this to much carbuerator for the engine?

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Old 01-18-2012, 01:24 PM
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I don't think so. 750s are usually right on home on 400's. However there are things that can cause this condition. Float level too high, fuel pressure too high, trash in the needle and seat causing a flooding condition. Butterflies off the idle circuits due to spark timing advance being too low. This can also be caused by a weak ignition system. Most carbs don't like over 5 psi fuel pressure. When is this occuring, at cruise? Idle?
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Old 01-19-2012, 07:58 AM
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Wet Plugs

Is it possible that I need a better set of plugs, I am using Autolite Copper Core Resistor Spark Plugs.
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Old 01-19-2012, 10:08 AM
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DoubleVision has listed 2 of the problems that I would have thought about first, float set too high or fuel pressure too high.
Set the float according to the instructions in the Owner's Manual, shown in a link at the bottom of this post. Then tee off at the carb inlet, running a copper line back to the firewall and up past the lip of the hood to the cowl. Temporarily mount a mechanical 0-15 psi, liquid-filled fuel pressure gauge on the cowl using duct tape or tie wraps or whatever, so that you can monitor the fuel pressure through the windshield while you drive. If you see over 6 psi pressure, replace the fuel pump with this Carter muscle car pump and monitor pressure....
http://www.summitracing.com/parts/CRT-M6624/
frequently asked questions...
http://www.edelbrock.com/automotive_...carb_faq.shtml
Owner's Manual...click on the link in the site above. My computer has some worms in it and will not let me link it.
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Old 08-05-2014, 11:29 PM
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One eagle-eyed , however, held up the "mo" tweet as a loosely veiled official coming-out by the yellow-headed non-human, albeit in good humor.
Yeah, I was just gonna say that.
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Old 08-07-2014, 11:08 AM
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Quote:
Originally Posted by rmcclain2974 View Post
I have a 400 chevrolet small block with vortec heads steam holes have been drilled and a 750 edelbrock carbuerator, spark plugs keep getting wet, is this to much carbuerator for the engine?
Knowing the heat range on the spark plugs would be useful and more about the enigne, one thinks that if it has L31 heads adapted to a 400 that other changes are lurking in there.

It goes like this with wet plugs assuming fuel wet.

Too much fuel:
- choke stuck on
- floats too high
- jets to big or metering rods too small
- power metering pistons spring too stiff
- cam too big results in manifold vacuum too low which gos back to how the power metering piston behaves

Too little spark:
- wrong heat range plugs too cold so they foul out wet in this case
- too weak voltage leaking away or not developing enough to work. This can also be a compression issue with vortecs on a 400 where the SCR is too high for the ignition system to jump the gap
- gap too wide
- insufficient spark lead
- much compresson leading to miss fires

Too much cooling:
- thermostat to cold or absent so engine doesn't get hot enough for plugs to burn off deposits
- engine not driven used or run long enough to get up to normal operating temperature

Big Cam:
- high amount of idle mixture dilution to where the plugs foul before the engine warms up because they run too cold because of weak idle mixture
- carb idle adjustment has throttle blades too open to where the transition circuit and perhaps even main metering are operating along with the idle circuit

All of these and more can lead to the problem you have. So knowing a lot more about the engine, the vehicle, the conditions would be useful.

Bogie
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Old 08-07-2014, 02:14 PM
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Yellow headed non-human? Is that like a better version of 'redheaded stepchild'?
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Yeah, I was just gonna say that.
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Old 08-07-2014, 02:30 PM
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Yellow headed non-human? Is that like a better version of 'redheaded stepchild'?
HAHAHAHA, who the ***k knows?
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