Engine Guys;;;RV Cam Specs, Will it work
#1
12-18-2021, 07:42 PM
Engine Guys;;;RV Cam Specs, Will it work
79 300 (I am not now nor have I never been a CAM GUY.
I have a quick question concerning RV cam with the following Specs,
CAM --- ELGIN E-1178-P
RPM Range 1500--4000
Valve Lift INTAKE --449
EXHAUST --473
Average Duration INTAKE 280
EXHAUST 289
Spring Pressure 105 Seat
265 Open
Question is will this RV cam work with stock head,,(re surfaced) also stock springs
Thank you Very much
Alex
I have a quick question concerning RV cam with the following Specs,
CAM --- ELGIN E-1178-P
RPM Range 1500--4000
Valve Lift INTAKE --449
EXHAUST --473
Average Duration INTAKE 280
EXHAUST 289
Spring Pressure 105 Seat
265 Open
Question is will this RV cam work with stock head,,(re surfaced) also stock springs
Thank you Very much
Alex
#2
12-19-2021, 12:24 PM
#3
12-19-2021, 12:26 PM
#4
12-19-2021, 03:31 PM
Yes, the ELGIN E-1178-P will work with the stock head
The correct springs for that cam is the Crane 96803-12 but it shows as not available.
The next closest spring is the Comp 942-12 with the Comp 768-16 retainers.
Normally you would order Comp 768-12 retainers but they have a February ship date.
The Comp 768-16 ships tomorrow. (I still wouldn't hold my breath while waiting)
What are you going to use for a carburetor and intake manifold?
The correct springs for that cam is the Crane 96803-12 but it shows as not available.
The next closest spring is the Comp 942-12 with the Comp 768-16 retainers.
Normally you would order Comp 768-12 retainers but they have a February ship date.
The Comp 768-16 ships tomorrow. (I still wouldn't hold my breath while waiting)
What are you going to use for a carburetor and intake manifold?
#5
12-19-2021, 04:18 PM
Pmuller,
The only plan here was to use a RV cam to change my torque range. lower end...
I was under the impression that a RV cam was pretty much the same as stock except they changed the lobe separation
for lower end torque. Should idle pretty smooth with better mileage??
The engine is all original int. ex.
Do I need to go back to the stock cam?
Thank you, Alex
The only plan here was to use a RV cam to change my torque range. lower end...
I was under the impression that a RV cam was pretty much the same as stock except they changed the lobe separation
for lower end torque. Should idle pretty smooth with better mileage??
The engine is all original int. ex.
Do I need to go back to the stock cam?
Thank you, Alex
#6
12-19-2021, 04:37 PM
#7
12-19-2021, 05:06 PM
Alex
An RV cam is intended to make more horsepower by producing more torque at a higher rpm for towing on the highway.
The Elgin cam is far from the stock cam specs.
The Elgin cam has an intake .050" duration of 204 degrees and an exhaust duration of 214 degrees on a 110 lobe separation angle.
The stock cam has an intake .050" duration of 192 degrees and an exhaust duration of 192 degrees on a 110 lobe separation angle.
What we prefer to do with the stock 300 is to keep the stock cam and replace the stock 1.6 ratio rocker arms with the Chevy six 1.75 ratio rocker arms to increase the valve lift.
CHEVROLET COMP Cams 1261-12 COMP Cams High Energy Rocker Arms | Summit Racing
How are you using this engine where you need more lower rpm torque?
Paul
An RV cam is intended to make more horsepower by producing more torque at a higher rpm for towing on the highway.
The Elgin cam is far from the stock cam specs.
The Elgin cam has an intake .050" duration of 204 degrees and an exhaust duration of 214 degrees on a 110 lobe separation angle.
The stock cam has an intake .050" duration of 192 degrees and an exhaust duration of 192 degrees on a 110 lobe separation angle.
What we prefer to do with the stock 300 is to keep the stock cam and replace the stock 1.6 ratio rocker arms with the Chevy six 1.75 ratio rocker arms to increase the valve lift.
CHEVROLET COMP Cams 1261-12 COMP Cams High Energy Rocker Arms | Summit Racing
How are you using this engine where you need more lower rpm torque?
Paul
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#8
12-19-2021, 08:06 PM
Paul,
Just a DD with some towing. Nothing special.
Thought this cam was almost stock as it sez relatively smooth idle and better mileage.
What is the end results using this cam with the appropriate Springs and stock ex and int/carb.
This is a rebuild .030 and stock head work.
Everything was great until I was checking the springs and found it was only .035 between the spring coils on EX. not the min .050 +
Thank you, Alex
Just a DD with some towing. Nothing special.
Thought this cam was almost stock as it sez relatively smooth idle and better mileage.
What is the end results using this cam with the appropriate Springs and stock ex and int/carb.
This is a rebuild .030 and stock head work.
Everything was great until I was checking the springs and found it was only .035 between the spring coils on EX. not the min .050 +
Thank you, Alex
#9
12-19-2021, 09:31 PM
Alex
Those that have used this cam were satisfied with it's pulling performance but the stock intake and 1V carb kill the engines power after 3000 rpm.
Here is part of a post from "bubba22349". Note: The Melling and Elgin RV cams are the same.
Paul
Those that have used this cam were satisfied with it's pulling performance but the stock intake and 1V carb kill the engines power after 3000 rpm.
Here is part of a post from "bubba22349". Note: The Melling and Elgin RV cams are the same.
Using a stock intake manafold and one barrel carb will work well with a Torque / RV cam, I did this combo on a 300 build in my 65 F350 back in the late 1980's. I used a Melling torque cam, the new 300 used the trucks original 240 six log exhaust with the stock 240 six intake manifold and a new Holley 1940 1V carb. It worked very well up to about 62 MPH were it stopped pulling. So yes, the intake will be one of the first limiters
#10
12-20-2021, 07:52 AM
Thank you Paul M
Paul,
I would like to thank you very much for taking the time to answer my questions concerning the RV cam.
I also respect your knowledge and the way you present the information in a manor we non engine builders can understand.
So, from what I have learned here with parts availability and all It will probably make more sense for me to go back to the stock cam now than wait until after startup. Easier now, even though the engine is complete and in the truck but front radiator support and fenders are still off for easy access.....
I will chalk this one up as NOT ENOUGH DUE DILIGENCE ON MY PART.. LOL
Alex
I would like to thank you very much for taking the time to answer my questions concerning the RV cam.
I also respect your knowledge and the way you present the information in a manor we non engine builders can understand.
So, from what I have learned here with parts availability and all It will probably make more sense for me to go back to the stock cam now than wait until after startup. Easier now, even though the engine is complete and in the truck but front radiator support and fenders are still off for easy access.....
I will chalk this one up as NOT ENOUGH DUE DILIGENCE ON MY PART.. LOL
Alex
#11
12-20-2021, 09:28 AM
Alex
You are welcome.
There are better cams to choose from if you decide to change in the future. You will also want to upgrade the intake manifold, carburetor and exhaust manifold at the same time.
Here is the camshaft list. https://www.ford-trucks.com/forums/1...l#post19535861
For now, keep the stock cam and replace the stock 1.6 ratio rocker arms with the Chevy six 1.75 ratio rocker arms.
CHEVROLET COMP Cams 1261-12 COMP Cams High Energy Rocker Arms | Summit Racing
Paul
You are welcome.
There are better cams to choose from if you decide to change in the future. You will also want to upgrade the intake manifold, carburetor and exhaust manifold at the same time.
Here is the camshaft list. https://www.ford-trucks.com/forums/1...l#post19535861
For now, keep the stock cam and replace the stock 1.6 ratio rocker arms with the Chevy six 1.75 ratio rocker arms.
CHEVROLET COMP Cams 1261-12 COMP Cams High Energy Rocker Arms | Summit Racing
Paul
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