COMP CAMS vs. CRANE CAMS
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Lobe Center Angle, Lobe separation Angle, Lobe Displacement Angle all equal the same thing. It is the distance in degrees from the exhaust peak lift to the intake peak lift.
Overlap has zero effect on cranking pressure. The intake opening and closing events of the cam have everything to do with it. A wider LCA cam (if installed straight up)moves the intake event further into the compression stroke and therefore decreases cylinder pressure more than a narrow LCA cam installed straight up.
If your cam has a 110LCA and a 106 IntCL then it was installed 4 degrees advances which seems to be the going trend among many manufacturers.
Russ, as for stall converters I don't consider weight. A perfect stall converter stalls out right before the torque peak. However, in a street driven vehicle where a stall that perfectly matches your cam is far from feasible I would rather have the higher stall in the heavier vehicle to help get it going.
Overlap has zero effect on cranking pressure. The intake opening and closing events of the cam have everything to do with it. A wider LCA cam (if installed straight up)moves the intake event further into the compression stroke and therefore decreases cylinder pressure more than a narrow LCA cam installed straight up.
If your cam has a 110LCA and a 106 IntCL then it was installed 4 degrees advances which seems to be the going trend among many manufacturers.
Russ, as for stall converters I don't consider weight. A perfect stall converter stalls out right before the torque peak. However, in a street driven vehicle where a stall that perfectly matches your cam is far from feasible I would rather have the higher stall in the heavier vehicle to help get it going.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
There are much hotter cams in the hydraulic fashion than the 801. You can get hydraulics up to 270 degrees @.050 and over .650 lift. Take a look at www.lazercams.com. That is where my next cam is going to come from.
Senior User
Joined: Nov 2000
Posts: 366
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From: Calgary
Originally Posted by Ratsmoker
There are much hotter cams in the hydraulic fashion than the 801. You can get hydraulics up to 270 degrees @.050 and over .650 lift. Take a look at www.lazercams.com. That is where my next cam is going to come from.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Crane has hotter hydraulic cams than the 801. Look at the 344621. 296/300 adv duration, .554" / .563" lift.
With this cam you would gain next to nothing on the top end and lose a lot of low end torque compared to the 941 or the 801.
What's the obsession with big cams? Do you like driving around at 3500rpm, having no low end torque to speak of, and getting 5mpg? Or are you planning a strip only race truck?
With this cam you would gain next to nothing on the top end and lose a lot of low end torque compared to the 941 or the 801.
What's the obsession with big cams? Do you like driving around at 3500rpm, having no low end torque to speak of, and getting 5mpg? Or are you planning a strip only race truck?
Senior User
Joined: Nov 2000
Posts: 366
Likes: 0
From: Calgary
Originally Posted by rusty70f100
Crane has hotter hydraulic cams than the 801. Look at the 344621. 296/300 adv duration, .554" / .563" lift.
With this cam you would gain next to nothing on the top end and lose a lot of low end torque compared to the 941 or the 801.
What's the obsession with big cams? Do you like driving around at 3500rpm, having no low end torque to speak of, and getting 5mpg? Or are you planning a strip only race truck?
With this cam you would gain next to nothing on the top end and lose a lot of low end torque compared to the 941 or the 801.
What's the obsession with big cams? Do you like driving around at 3500rpm, having no low end torque to speak of, and getting 5mpg? Or are you planning a strip only race truck?
I have gobs of low-end torque. Strictly street/strip. Trying to catch to my brother and shave a second off. Just relized the next step will be a big one.
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Elder User
Joined: Jun 2001
Posts: 508
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From: Corpus Christi, Texas
Rat that is what i was talking about as far as lobe over lap my cam intake opens 40 BTDC and close 72 ABDC and exhaust opens 80 BBDC and close 32 ATDC so both the valves are open 72 degrees at the same time please correct me if I am wrong but I believe this is how I understand this??
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Originally Posted by rusty70f100
What's the obsession with big cams? Do you like driving around at 3500rpm, having no low end torque to speak of, and getting 5mpg? Or are you planning a strip only race truck?
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Originally Posted by polcat
Rat that is what i was talking about as far as lobe over lap my cam intake opens 40 BTDC and close 72 ABDC and exhaust opens 80 BBDC and close 32 ATDC so both the valves are open 72 degrees at the same time please correct me if I am wrong but I believe this is how I understand this??
If you have two cams with identical lobes but different LCAs the cam with the wider LCA (less overlap) will have less cranking pressure if both cams were installed straight up.
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