Project: Tow Tool
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Otherwise, I'd say 'Yes' you're going to need to richen the mixture.
A wideband A/F meter in a welded bung on your headers would tell you where you're at.
http://www.innovatemotorsports.com/products/db.php
A wideband A/F meter in a welded bung on your headers would tell you where you're at.
http://www.innovatemotorsports.com/products/db.php
Thread Starter
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Senior User
Joined: Sep 2011
Posts: 442
Likes: 1
From: Roanoke, VA
So the jets will affect temp? Where would you say I start on jets?
Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
Likes: 11
From: Exmore, VA
Jim, the EGR doesn't richen the cruise mixture, it dilutes the charge with exhaust gases, thereby lowering the combustion temperature. It's purpose is the reduce the NOX values.
Pull a couple of plugs and get some pictures of their color, if you are running either lean on cruise or too much spark advance they will tell the tale.
Pull a couple of plugs and get some pictures of their color, if you are running either lean on cruise or too much spark advance they will tell the tale.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
By reducing available oxygen in the intake charge it "effectively" richens the mixture and reduces the combustion temperature.
(how hot is an Oxyacetylene flame when rich and sooty V/S when oxidizing flame?)
Yes, it's main purpose is to reduce NOX, but lower combustion temperatures also result in a cooler running engine when lean mixtures are being burned.
Thread Starter
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Senior User
Joined: Sep 2011
Posts: 442
Likes: 1
From: Roanoke, VA
Bill,
By reducing available oxygen in the intake charge it "effectively" richens the mixture and reduces the combustion temperature.
(how hot is an Oxyacetylene flame when rich and sooty V/S when oxidizing flame?)
Yes, it's main purpose is to reduce NOX, but it lower combustion temperatures also result in a cooler running engine when lean mixtures are being burned.
By reducing available oxygen in the intake charge it "effectively" richens the mixture and reduces the combustion temperature.
(how hot is an Oxyacetylene flame when rich and sooty V/S when oxidizing flame?)
Yes, it's main purpose is to reduce NOX, but it lower combustion temperatures also result in a cooler running engine when lean mixtures are being burned.
What I think I hear is reducing oxygen and to match a lower fuel amount at cruise. So because I don't have egr reducing the oxygen amount I need to increase my fuel to match it up.
Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
Likes: 11
From: Exmore, VA
Look at your plugs first, if you do go richer do it 2 jet numbers, 68 to 70 and see. If you are too lean then your fuel economy (I know it's a joke on a 460) will increase, too lean can cause a slight misfire that you may not even feel.
One more item, back to the spark advance, under load the vacuum advance falls off. Yours should have an adjustable vacuum advance, if you have an adjustable timing light you can try seeing where it is sitting at 2500 rpm.
One more item, back to the spark advance, under load the vacuum advance falls off. Yours should have an adjustable vacuum advance, if you have an adjustable timing light you can try seeing where it is sitting at 2500 rpm.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
It "effectively" richens the mixture.
Suffice to say, the oxygen and fuel molecules are somewhat diluted and separated by the incombustible carbon dioxide and that will slow and cool the flame front.
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Fortunately, the Crane Cams 99607-1 adjustable vacuum advance is back available after their bankruptcy restructuring.
http://www.cranecams.com/uploads/instructions/271e.pdf
Thread Starter
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Senior User
Joined: Sep 2011
Posts: 442
Likes: 1
From: Roanoke, VA
Another reason to check exhaust temps.
Fortunately, the Crane Cams 99607-1 adjustable vacuum advance is back available after their bankruptcy restructuring.
http://www.cranecams.com/uploads/instructions/271e.pdf
Fortunately, the Crane Cams 99607-1 adjustable vacuum advance is back available after their bankruptcy restructuring.
http://www.cranecams.com/uploads/instructions/271e.pdf
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
If the thermostat housing is reading 191 with a 195* 'stat then it isn't your problem.
The spring acts more like a throttle and the thermostat should maintain whatever temp is called for.
Running the engine cooler doesn't help combustion efficiency -at all- and the oil takes much longer to reach operating temperature.
JMHE,
The spring acts more like a throttle and the thermostat should maintain whatever temp is called for.
Running the engine cooler doesn't help combustion efficiency -at all- and the oil takes much longer to reach operating temperature.
JMHE,
