Older Rig Updates: Cooling and Power
I thought I would post my latest updates to our Suburban. Had some nice weather yesterday and got some work done. In my last post, I had regeared from 3.73's to 4.56's. My truck and trailer specs a...
Forum Discussion
Love that era too...albeit there were issues and solutions will touch oh below
Std Duty vs HD & Severe Duty fan clutches has the std duty couple water pump shaft RPMs to the fan around 50%-60%. Where as the HD & Severe duty couples +90T% of the water pump shaft RPMs to the fan blade.
Difference between the HD and Severe duty is with the shaft bearing. Since the Severe Duty pulls +25HP it wants to make like an airplane propeller...and if the bearing lets loose...it will punch a hole in the radiator
Hope you changed the serpentine belt too. Also the tensioner, they squeak just before they either freeze up or fall apart around 100K miles when towing heavy, because the clutch turns on more often
Surprised you managed to fit that fan blade/clutch into the fan shroud. Good going !!!
Mine ROARs when it kicks in and then can see the dash temp gauge needle drop like a rock. Mainly comes on when towing heavy.
From your pic...did you remove the CATS ? This era GM Small Block really likes to have the exhaust opened up....headers realy wakes most all 5.7L's
1996 was one of the first years the Big Three changed coolant to match foreign badges and their 100K mile guarantee. Placating dealerships (they don't like to flush coolant, messy job and low margin). So GM worked with Texaco to formulate DeathCool (look that up here and out in the open web)
Will post on the other DeathCool thread after this post
Good to hear of your good experience going to higher numeric diff ratio. Getting close to having to rebuild my 7.4L and while at it, going to 5.xx diff ratios and a Gear Vendor to change my 4 speed 4L80E into an 8 speed automatic
Consider changing to copper core spark plugs if you are willing to change them every 30K-40K miles. Platinum's are just okay, IMHO, and more for their 100K mile life than performance
And consider changing the intake filter from the standard duty to a HD air filter. Your 5.7L and my 7.4L filter box are the same. GM has a HD filter that is about 2" larger in dia (more filtration area and lower PSI drop). If photobucket images don't show, I'll come back later to fix
Pictures of the spark-plug mod and air filter at this link: Something is wrong with the beast!! page 3
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/26732781/gotomsg/26733766.cfm#26733766
Click For Full-Size Image.
Std Duty vs HD & Severe Duty fan clutches has the std duty couple water pump shaft RPMs to the fan around 50%-60%. Where as the HD & Severe duty couples +90T% of the water pump shaft RPMs to the fan blade.
Difference between the HD and Severe duty is with the shaft bearing. Since the Severe Duty pulls +25HP it wants to make like an airplane propeller...and if the bearing lets loose...it will punch a hole in the radiator
Hope you changed the serpentine belt too. Also the tensioner, they squeak just before they either freeze up or fall apart around 100K miles when towing heavy, because the clutch turns on more often
Surprised you managed to fit that fan blade/clutch into the fan shroud. Good going !!!
Mine ROARs when it kicks in and then can see the dash temp gauge needle drop like a rock. Mainly comes on when towing heavy.
From your pic...did you remove the CATS ? This era GM Small Block really likes to have the exhaust opened up....headers realy wakes most all 5.7L's
1996 was one of the first years the Big Three changed coolant to match foreign badges and their 100K mile guarantee. Placating dealerships (they don't like to flush coolant, messy job and low margin). So GM worked with Texaco to formulate DeathCool (look that up here and out in the open web)
Will post on the other DeathCool thread after this post
Good to hear of your good experience going to higher numeric diff ratio. Getting close to having to rebuild my 7.4L and while at it, going to 5.xx diff ratios and a Gear Vendor to change my 4 speed 4L80E into an 8 speed automatic
Consider changing to copper core spark plugs if you are willing to change them every 30K-40K miles. Platinum's are just okay, IMHO, and more for their 100K mile life than performance
And consider changing the intake filter from the standard duty to a HD air filter. Your 5.7L and my 7.4L filter box are the same. GM has a HD filter that is about 2" larger in dia (more filtration area and lower PSI drop). If photobucket images don't show, I'll come back later to fix
Pictures of the spark-plug mod and air filter at this link: Something is wrong with the beast!! page 3
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/26732781/gotomsg/26733766.cfm#26733766
Click For Full-Size Image.
