Back to There are two easy ways to change the characteristics of your cam. The laws The reality is that you cannot visually see if a cam is 'aggressive' or not. MAJOR INTENSITY may be computed by subtracting duration at.05000" cam lift closing, but recent advancements in design technology have made it possible Loosening the valve lash (or advancing the cam) will increase power out of the turns with a slight power loss at top rpm. Power increases are most evident at higher rpm where exhaust back pressure is greatest and reversion is most prevalent. Major intensity is computed by subtracting duration at 0.050-inch cam lift from duration at 0.020-inch cam lift. Either way, if you insist on continuing to use the term 'aggressive ramp', the reality is that you cannot visually see it! Now is a good time to mention that while your cam grinder or engine builder should be able to supply you with a cam appropriate for your application, it will be necessary in most cases to change jetting and fine tune the cam timing and lash settings to the driver’s preference and ability. the TOTAL INTENSITY. Fax (828) 681-5185 Arden, NC 28704 State-of-the-art lobe designs therefore, deliver "MORE CAM" per dollar because When comparing camshaft specifications, the best way to cut through the confusion In There can easily be 4 or even 6 degree variations in different brands of timing sets. One other important thing is knowing the minimum rpm encountered. Failure to accurately degree in the camshaft is another culprit. Before cam duration can be matched to an engines operating range, the exact The irony of this chart is that Impostor4 is considered a good drag racing cam used in the Drag race market, but if you compare, it is less 'aggressive' than even the Skunk2 stage3 cam. The ideal cam profile would raise the valves to full lift instantly, hold grinder who has used an exacting timing point for many years may be reluctant MINOR INTENSITY may be computed by subtracting duration at.05000" cam lift from duration at.01000" cam lift. a competitive cam grinder may think that his cam will sell better if it is If you don’t know where your valve timing is then the cam grinder or engine builder cannot recommend changes to help you get the most out of your engine. Therefore, the competitive cam may be rated https://skunk2.com/products/dave-talks-cams-part-4/. You won’t hurt anything by going too tight but too loose will let the valves slam shut causing  damage to valves and seats. hydraulic cams at .006" tappet lift. When specifications are listed, this On average the cam with the smaller intensity will open approx. • Hydraulic Intensity is the difference between the .004 duration and the .050 duration. same. same amount of cam lift. Changing to a shorter duration cam for car A or a longer duration cam in car B will accomplish the same thing but at a much higher cost in time as well as dollars. on its duration at .05000" cam lift. This field is for validation purposes and should be left unchanged. It is the difference in duration between the advertised duration, which is usually 0.020 lifter rise, and 0.050 lifter rise. This caters to the Our 24 degree XTLZ profiles are a notable exception to this. Car setup and the ability of the driver to accurately feel what the car is doing is more important than the last 20 horsepower. However the more power out of the turns you give them the slower they go. I define SPAN with the following notation: I don't think it would ever be appropriate to use the term 'aggressive' to describe a clearance ramp; a section of the cam that for the most part is not even in contact with the follower or acting on the valve. In all cases, the cams with shorter intensity figures enhance idle quality, off idle, and mid-range torque without sacrificing top-end power. a cam will appear to be producing surprisingly more horsepower than an "equivalent" 5 degrees faster; as a result the area under the lift curve will be greater on the cam with smaller intensity numbers. These would be the duration difference between 0.020” and 0.100” or 0.200” respectively and tell me how quickly the cam is opening and closing between those two points. hydraulic camshafts are specified at something less than the .00400" tappet to change. Click to view the brands of Camshafts that we stock. will make the cam appear "shorter" (have less duration) than those of the 'Ramp' is also a term that few people understand. © 2020 Group-A Engineering, inc. / 2050 5th st. norco, ca 92860, PART1...... https://skunk2.com/products/dave-talks-cams-part-1/, PART2...... https://skunk2.com/products/dave-talks-cams-part-2/, PART3...... https://skunk2.com/products/dave-talks-cams-part-3/, PART4..…. the tendency to over cam an engine. ... ************ Copyright 2014 Dave Hsu - All Rights Reserved************** Driver style plays a big part in the picture. low lift. Above you can see a chart comparing the 'intensity'/aggressiveness of some Impostor4 cams versus Skunk2 cams. .004 to .006 loose is usually OK. Look at the Major Intensity numbers to get an idea as  to how radical the profile is. Peak numbers are for bragging purposes and high peak numbers do not win races. It also means that with a highly modified engine, it may be practical to Believe it or not, S2 Ultra4 has 'ramps' that are only moderately aggressive' because we wanted to design an all-around cam that would be good for the street, strip, and road course. Few drivers can accurately tell you what their lowest rpm really is. "HAPPY CAM ANALYSIS TO YOU" in a television soap opera! Why did this cam work so well for one racer and not for another? Tech Menu competition. from duration at .02000" cam lift. The reasons can be many. mid-range torque is in selecting the right high performance camshaft. IMPORTANT NOTE! 220 degrees at .05000" cam lift has a HYDRAULIC INTENSITY of 60.00 degrees. Frequently this is followed by selling or giving the cam to a fellow racer who finds it is the best cam he ever ran. of physics make it impossible to achieve instantaneous valve opening and 1 (951) 808-9888 Monday - FridayTechnical and Sales Calls: 7:00 a.m. to 5:00 p.m. PSTOffice Hours: 8:00 a.m. to 5:00 p.m. PST, * WARNING: CANCER & REPRODUCTIVE HARM - WWW.P65WARNINGS.CA.GOV "HYDRAULIC INTENSITY", "MINOR INTENSITY and "MAJOR INTENSITY". This is especially true with dirt cars. “Home of the Torque Monster Cams”, Technical Assistance (828) 681-5183 them open for a specified duration and then close them instantly. of profiles (HMV means "Hydraulic Maximum Velocity") from the cam manufacturer MAJOR INTENSITY may be computed by subtracting duration at .05000" cam lift to duration at .00400" lift. You won’t hurt anything by tightening the lash but check with your cam grinder as to the maximum lash you can use before running off the ramp and damaging the valves. • Minor intensity is the difference between the .010 duration and the .050 duration. Posted March 23, 2017 by camcraftcams-admin, by Charles Reichard engines, or intended to enhance fuel economy, a manufacturer may rate its Exhaust is less critical  with 1.5 or 1.55 being the most popular. People look at one side of cam lobe and assume its the ramp...well, it is not. PART3...... https://skunk2.com/products/dave-talks-cams-part-3/ is to focus on duration at .050" lift and lobe separation. lift from duration at .00400" cam lift. they produce more power over a wider rpm band. Dyno testing doesn’t test drivability or throttle response of the engine. • Minor intensity is the difference between the .010 duration and the .050 duration. In this case, the ramp is the section of the cam that goes from the base circle up to it's maximum positive acceleration peak; on a K engine this would be the section from the base circle to approximately 0.035" cam lift. • Hydraulic Intensity is the difference between the .004 duration and the .050 duration. degrees would have a MAJOR INTENSITY SPAN of (17.00/17.00). Another point to consider is that with an underrated advertised duration, efficiency. I have talked to few racers that can’t hook up 600 LB/ft of torque on 8 inch tires if you can give it to them. profile from a competing manufacturer. computation of advertised duration may therefore be instrumental in reducing If you look at the intensities of the S2 Ultra BMF drag race cams, you will see that this cam is even more aggressive, but it is still far from pushing the limits. The cam degree wheel is loosely installed at 0-degrees for now until we can confirm absolute TDC, which Tony did by placing a dial gauge on the … They might also say that it has an 'aggressive ramp'. That The laws of physics make it impossible to achieve instantaneous valve opening and closing, but recent advancements in design technology have made it possible to open and close the valves with more area under the lift curve. It often helps to utilize a lower cam lift with high ratio rockers. So again, by playing the numbers game, a manufacturer can make its line of SPAN of (24.00/32.00). HYDRAULIC INTENSITY may be computed by subtracting duration at .05000" cam The stage 3 opens and closes 6.74 degrees faster to 0.050", 9.21 degrees faster to 0.0100", and 8.92 degrees faster to 0.200". However, the cam with the smaller HYDRAULIC, MINOR or MAJOR INTENSITY figure ************ Copyright 2014 Dave Hsu - All Rights Reserved************** That's why knowledgeable engine builders usually select a camshaft based ( major intensity is the difference between the .020 duration and the .050 duration.) Aggressive is a vague term that is thrown around by people that have little knowledge about camshafts. I call them Viewed from another perspective, a lower HYDRAULIC, MINOR or MAJOR INTENSITY Making these changes to cam timing is important to not only optimize your present combination but to indicate a direction for future cam changes. true that less duration means more usable torque and horsepower. These are the PUBLISHED numbers from the HMV series There are a number of reasons that a hydraulic lifter cam may have its duration on Fentress Boulevard in Daytona Beach, Florida. to open and close the valves with more area under the lift curve. 220 degrees at.05000" cam lift has a HYDRAULIC INTENSITY of 60.00 degrees. Compatibility problems with torque converter and a broader power curve. https://skunk2.com/products/dave-talks-cams-part-4/. at .05000" lift, maximum torque and horsepower will be almost identical. If a statement Often a low cam lift with 1.65 or 1.7 ratio rockers is very helpful on the intake side as long as lift is kept to about .550. cam lift must be specified at where the duration is computed. As an example, if one company has a popular racing hydraulic camshaft that Changing the valve lash is a good way to get an indication of which way to go for your next cam change. from duration at .01000" cam lift. The important numbers on a dyno sheet are about a thousand RPM above and below peak torque and peak horsepower. Increased top end power will be an added bonus but the real need was to get horsepower off the corners down to a level that the car and driver can handle.

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