Cams (Lots of Questions)
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Teching In
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Cams (Lots of Questions) What effects how a cam makes power? I s it intake lift, Duration, exaust lift, duration. What is the lobe separation and how does it affect power. Where will the highest and lowest amount of intake/exaust lift duration make the most power what type is better for highend power and low end toque. Anyone know what kind of cam will be best for N/A and what will be best for spray. Lookin to run better than 11.40's N/A.
ANY HELP U GUYS CAN GIVE WOULD BE GREATLY APPRECIATED! <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
ANY HELP U GUYS CAN GIVE WOULD BE GREATLY APPRECIATED! <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
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Joined: Nov 2001
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From: Nawf Carolina
Re: Cams (Lots of Questions) If you do a search on the topic here, you'll find literally hundreds, probably over a thousand threads about cams. There is so much info it will make you go <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
I'll try to sum up the basics and then you can go looking more in depth.
Duration is how long the valves are held open. Higher duration typically means the powerband is higher up. A cam with more duration will also idle rougher than a smaller cam, everything else held equal.
Lift is how far the valves open. It doesn't effect idle quality, but higher lifts require stiffer valvesprings.
Ramp rates also effect the power of a cam. This is how fast the valves open. Comp has some new cams with very fast ramps, called the XE-R series. Thunder Racing and MMS also have some very fast ramps.
Unless you're spraying a 200 shot or more, you should probably just pick a good n/a cam.
Lobe seperation angle, or LSA, is the difference in degrees between the centerlines of the lobes. A 116 LSA will idle much smoother than a 110, and will peak higher, everything else held equal. A 110 will make more power in the midrange typically, and peak lower. Most LS1 cams are 112 or 114, with some running 111 or 113.
Most street LS1 cams vary in duration between 216@.050" and 228@.050." There are a large number (at least 6 or 7) of very popular ones between 220 and 224 degrees of duration. Most use lift in the .525-.570 range. Some popular ones are:
Comp 220/224
Thunder Racing 220/220
MTI B1 221/221
MTI T1 221/221 but a different LSA
MTI C1 222/222 faster ramps
Thunder Racing 224/224
MMS 224/224
LG Motorsports G5
MMS 229
Thunder Racing 230/224
Comp grinds in almost every duration combo between 216 and 230
This is just the basics, there are many many informative threads here. Such as https://ls1tech.com/ubb/cgi-bin/ulti...c;f=1;t=000045
J.
I'll try to sum up the basics and then you can go looking more in depth.
Duration is how long the valves are held open. Higher duration typically means the powerband is higher up. A cam with more duration will also idle rougher than a smaller cam, everything else held equal.
Lift is how far the valves open. It doesn't effect idle quality, but higher lifts require stiffer valvesprings.
Ramp rates also effect the power of a cam. This is how fast the valves open. Comp has some new cams with very fast ramps, called the XE-R series. Thunder Racing and MMS also have some very fast ramps.
Unless you're spraying a 200 shot or more, you should probably just pick a good n/a cam.
Lobe seperation angle, or LSA, is the difference in degrees between the centerlines of the lobes. A 116 LSA will idle much smoother than a 110, and will peak higher, everything else held equal. A 110 will make more power in the midrange typically, and peak lower. Most LS1 cams are 112 or 114, with some running 111 or 113.
Most street LS1 cams vary in duration between 216@.050" and 228@.050." There are a large number (at least 6 or 7) of very popular ones between 220 and 224 degrees of duration. Most use lift in the .525-.570 range. Some popular ones are:
Comp 220/224
Thunder Racing 220/220
MTI B1 221/221
MTI T1 221/221 but a different LSA
MTI C1 222/222 faster ramps
Thunder Racing 224/224
MMS 224/224
LG Motorsports G5
MMS 229
Thunder Racing 230/224
Comp grinds in almost every duration combo between 216 and 230
This is just the basics, there are many many informative threads here. Such as https://ls1tech.com/ubb/cgi-bin/ulti...c;f=1;t=000045
J.