Installing Comp 268 Cam
#21
12-23-2012, 08:46 PM
Join Date: Aug 2007
Location: Austell, GA
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#23
01-01-2013, 04:35 PM
. Oh and a big thumbs up for you getting the wife to help make the vid!!
#24
01-02-2013, 11:22 AM
Registered User
As a method of madness, I have the same cam in my truck, the 268/272.
A word of advice: Advance your cam timing one notch. It has 54 teeth on the cam gear, advancing it one notch will give it about 6.8 degrees advance over stock. Since this cam is normal power up to 1500 rpm, and then considerable gains (54 hp at 5700 I think, it will extend power into higher rpm than that) starting at 1500rpm, the hp curve will lower about 400rpm, to kick in at 1100 rpm, maybe a little lower. It will be quicker off the line and it will give the powerband better use, up to and past 6000rpm. I saw another forum where a guy with a 2003 Jeep Patriot (?) Hemi did the same cam as us but did the one tooth advance and picked up a load of mileage. He claimed a very best of 27mpg on the highway. I have gotten 22 in mine with the stock motor and a Superchips tuner, and now I get about 18mpg with the build, without a decent tune on crappy Oregon gas. Also, he said that he got more horsepower, and of course better low end grunt. I have heard that cam timing like this can really help in the power and mileage areas, as the valves are shut completely when the piston starts traveling up in the cylinder, so you get the full compression out of the cylinder stroke. A mechanic I know did this in a SBC and picked up almost 50whp in a stock 5.3, as well as 5mpg, with no tune. Makes you wonder....
Just so you know.
A word of advice: Advance your cam timing one notch. It has 54 teeth on the cam gear, advancing it one notch will give it about 6.8 degrees advance over stock. Since this cam is normal power up to 1500 rpm, and then considerable gains (54 hp at 5700 I think, it will extend power into higher rpm than that) starting at 1500rpm, the hp curve will lower about 400rpm, to kick in at 1100 rpm, maybe a little lower. It will be quicker off the line and it will give the powerband better use, up to and past 6000rpm. I saw another forum where a guy with a 2003 Jeep Patriot (?) Hemi did the same cam as us but did the one tooth advance and picked up a load of mileage. He claimed a very best of 27mpg on the highway. I have gotten 22 in mine with the stock motor and a Superchips tuner, and now I get about 18mpg with the build, without a decent tune on crappy Oregon gas. Also, he said that he got more horsepower, and of course better low end grunt. I have heard that cam timing like this can really help in the power and mileage areas, as the valves are shut completely when the piston starts traveling up in the cylinder, so you get the full compression out of the cylinder stroke. A mechanic I know did this in a SBC and picked up almost 50whp in a stock 5.3, as well as 5mpg, with no tune. Makes you wonder....
Just so you know.
#25
01-05-2013, 09:40 AM
Join Date: Aug 2007
Location: Austell, GA
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As a method of madness, I have the same cam in my truck, the 268/272.
A word of advice: Advance your cam timing one notch. It has 54 teeth on the cam gear, advancing it one notch will give it about 6.8 degrees advance over stock. Since this cam is normal power up to 1500 rpm, and then considerable gains (54 hp at 5700 I think, it will extend power into higher rpm than that) starting at 1500rpm, the hp curve will lower about 400rpm, to kick in at 1100 rpm, maybe a little lower. It will be quicker off the line and it will give the powerband better use, up to and past 6000rpm. I saw another forum where a guy with a 2003 Jeep Patriot (?) Hemi did the same cam as us but did the one tooth advance and picked up a load of mileage. He claimed a very best of 27mpg on the highway. I have gotten 22 in mine with the stock motor and a Superchips tuner, and now I get about 18mpg with the build, without a decent tune on crappy Oregon gas. Also, he said that he got more horsepower, and of course better low end grunt. I have heard that cam timing like this can really help in the power and mileage areas, as the valves are shut completely when the piston starts traveling up in the cylinder, so you get the full compression out of the cylinder stroke. A mechanic I know did this in a SBC and picked up almost 50whp in a stock 5.3, as well as 5mpg, with no tune. Makes you wonder....
Just so you know.
A word of advice: Advance your cam timing one notch. It has 54 teeth on the cam gear, advancing it one notch will give it about 6.8 degrees advance over stock. Since this cam is normal power up to 1500 rpm, and then considerable gains (54 hp at 5700 I think, it will extend power into higher rpm than that) starting at 1500rpm, the hp curve will lower about 400rpm, to kick in at 1100 rpm, maybe a little lower. It will be quicker off the line and it will give the powerband better use, up to and past 6000rpm. I saw another forum where a guy with a 2003 Jeep Patriot (?) Hemi did the same cam as us but did the one tooth advance and picked up a load of mileage. He claimed a very best of 27mpg on the highway. I have gotten 22 in mine with the stock motor and a Superchips tuner, and now I get about 18mpg with the build, without a decent tune on crappy Oregon gas. Also, he said that he got more horsepower, and of course better low end grunt. I have heard that cam timing like this can really help in the power and mileage areas, as the valves are shut completely when the piston starts traveling up in the cylinder, so you get the full compression out of the cylinder stroke. A mechanic I know did this in a SBC and picked up almost 50whp in a stock 5.3, as well as 5mpg, with no tune. Makes you wonder....
Just so you know.
#27
01-12-2013, 08:24 AM
Join Date: Aug 2007
Location: Austell, GA
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