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Old 01-13-2016, 01:22 PM
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1990 - 560SEC, 600 CFM Holley carburetor install...

I have a 1990 - 560SEC, I put a 600 CFM Holley carburetor on it and removed the 2 high PSI fuel pumps and installed 1 low pressure fuel pump, I have the kept the stock (Dry) intake manifold and made a adapter/Plenum and put the Holley on it.

97 SL320, Your Comment was.

When you do a carb install, directing heat to the area below the carb is a must. Accomplish this by running a tube from one exhaust manifold to the area below the carb to the other ex manifold or run heater water flow through this area.

( Me ) The car runs super strong and has amazing power now, But like you said, It won't take the throttle until completely warmed up, Should I run a 1/2" exhaust pipe (through) the carb adapter/Plenum or just weld it onto the outside so it will transfer heat ? I am afraid if it goes (through) the carb adapter/Plenum it could cause a fire ? when first shut off ? What do you suggest I do, Thank you so much for your help.
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Old 12-03-2016, 09:49 PM
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HELLO , would you mind and post some pictures ?? that is great !!!
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Old 12-04-2016, 01:38 AM
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Find a thermo controlled warm air flap valve on an older V8 off the intake . Adapt an air pick up to one of the exhaust manifolds. I suggest that you do not fabricate under carb' heating of any kind.

I have a Holly equipped 1992 Crown Vic 302 roller motor running just fine in the winters with a warm air pick up and thermal controlled flap. Obviously flap must be controlled by vacuum. If flap not heat actuated from thermo valve.......

...get tricky like I did and run vacuum through a coolant temp vacuum valve screwed into the intake on the coolant runner.

http://ad-libs-vw-technical.blogspot.com/2007/10/long-awaited-progressive-carb-warm-air.html


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Old 12-04-2016, 08:47 AM
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What type of intake manifold are you using on the 92 302? Non FI engines have long had under carb heating, all carbed 302 had a center port that brought exhaust gasses from one head under the carb then to the other head. On most there was a exhaust flapper valve in one manifold that restricted exhaust so it flowed under the carb to the other head.

On inline 6 engines ( domestic ) the exhaust and intake manifolds were bolted together in the middle fully exposing the under carb area to exhaust heat. There was also a flapper to shield the intake from heat after the warm up period.

Some inline engines with intake and exhaust on opposite sides of the head use coolant to warm the intake but this is kind of slow.

Bringing hot air to the carb intake works but is more to prevent carb icing on cold damp days but it might be enough for other conditions.

Carlos, here are the original threads http://www.peachparts.com/shopforum/performance-paddock/374877-1990-560sec-600-cfm-holley-carburetor-install.html

http://www.peachparts.com/shopforum/performance-paddock/374532-1990-560sec-600-cfm-holley-carburetor.html
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Old 12-04-2016, 02:03 PM
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Quote:
Originally Posted by 97 SL320 View Post
What type of intake manifold are you using on the 92 302? ..............................................................
I used a Weiand manifold, iirc the FI 302 had no cross over heat out of the heads. It was in 2009 so memory hazy..

Have often found large chunks of cooked engine oil fall into in the cam valley from the underside of V8 carb'd motors with cross over exhaust heat and a good many with the oil pump pick up screen choked..

In the UK when working on USAF personnel American V8 vehicles this was most common when using Quaker State. Still not sure if it was the QS oil or the USA purchased engine oil being used with leaded petrol.
They mostly bought the oil from the Base Hobby Shop as it was so much cheaper.




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