Aeromotive; 913.647.7300; AeromotiveInc.com, AFR Heads; 661.257.8124; AirFlowResearch.com, Federal Mogul/Felpro; 248.354.7700; FederalMogul.com, Mahle; 248.347.9700; Mahle-Aftermarket.com, Scat Enterprises; 310.370.5501 ScatEnterprises.com, SuperFlow Dynamometers and Flow Benches; 515.254.1654; SuperFlow.com. Fixing the ignition coils is essential when you experience issues like engine misfire and the Check Engine light that wont go off. That is why 106 LSA consumes less oil. Anybody do any real testing on LSA in a 3.75 stroke small block chevy?I have always used 104-106 and was thinking about trying a 108 or 110 design.I know there is a lot of variables but just a general opinion from any experts.This is for motor only no nitrous.600-640 HP engine combos.Much appreciated! The lumpy-idling 101 LSA cam churned out an average of 484.0 hp at 6,100 rpm with 493.9 lb-ft of torque at 4,400 rpm. It really comes down to the application. hydraboost is the same as a vacuum brakebooster, only the booster is replaced by a unit that does the same but under hydraulic pressure. If the intake valve opens too early, it will push the new charge into the intake manifold. or just enough to keep the neighbors pissed? The lobe separation angle is the angle in camshaft degrees between the maximum lift points, or centerlines, of the intake and exhaust lobes. And better gas mileage. Again, these are general bits of conventional wisdom. For a better experience, please enable JavaScript in your browser before proceeding. Pretty much standard for an RV type cam. In reality, a cam with 220 at 0.050" and a lobe center angle of 112 will have the exact same mechanical overlap as a cam with 217 at 0.050" and a lobe center angle of 109. http://www.mustangworks.com/cgi-bin/moi-display.cgi?220, http://www.popularhotrodding.com/en6em_camshaft_specs/lobe_seperation_angle.html. If you look at the cam card, you will find a maximum lift column on the card.Now, all you have to do is, add up the two mentioned maximum angles and divide the summation by 2. Lobe sepsration is an advanced description for overlap.If you take a cam on a 112,and grind it on a 108,you add more overlap,the time the valves are both open.Narrower lobe centers mean more low end and midrange torque,along with a peakier powerband,and a slightly rougher idle.Tradeoffs are sensitivity to octane ratings,total timing, and air fuel ratio.A lot to swallow I know,hope this helps you. I've seen that Webcam cams can be ordered with either of the above. I would say 114-117* would be a normal 1960's stock cam range and 117* to 120* is more what we see on modern engines. Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 114LSA +4 puts the intake centerline at 110 degrees before top dead center. I am pretty sure, right now, you find yourself in the middle of the rising debate of 106 vs 110 lobe separation angle. somthing to that aspect. We borrowed Westech Performance's shop mule, a 370ci small-block Chevy and its SuperFlow 902 engine dyno and spent a day running each cam back-to-back to gauge its effect on peak horsepower, peak torque, cranking compression, idle vacuum, and the powerband as a wholeall the variables that define an engine's character on the street and track. 68 Mustang, 306, AFR 185\'s, CI cam, FPA\'s, Bigs 650 DP, T5Z, 9" w/4.33's. It has been tried in the VW business earlier, but then they gave it up because of problems with too high temperatures around the exhaust valve, causing them them to break. If you look at any given cam catalog, you will find that the majority of street-oriented cams fall in this range. from the intake to the exhaust and vise-versa.Thats why a performance cam will usually have a rougher idle than a stock one. But, the internal processings are much more complicated. by Kdub Sun Dec 07, 2008 1:20 am, Post The higher the compression and the higher you try and rev it, the more it will like a wider lobe center. A few other major and, Read More Heres What Causes Your Car to Bog Down When AcceleratingContinue, Your email address will not be published. After spending 8 years in plant production engineering, Noah wanted to join Engine Addiction as a key member of all cars specific guides, reviews, repairs, suggestions, and more. 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. AquaTraction Vs SeaDek: Which One Is Better For you? 106 LSA: So, if I talk about the powerband at 106 LSA, the powerband is narrow. 110 LSA: On the other hand, 110 LSA is comparatively a wider LSA; it can generate a massive amount of RPM for the engine. Is it a hydraulic roller as well? Knife edged & profiled 4MA Cleveland crank weighing 50lbs. After consulting with many experts, you are still in confusion between 106 and 110- lobe separation angles. Walter Noah is a process engineer who has a knack for resolving even the toughest technical issue. The 234o duration kind of eliminates the RV usage. 07 Though the CNC-ported heads offered plenty of flow, it was necessary to upgrade the supplied valvesprings. Hopefully It will do fine in my 2276 mostly drag bug. The 112-degree cam produced peak numbers of 567 hp at 6,200 rpm and 540 lb-ft of torque while pumping out 511 lb-ft of torque at 4,000 rpm. But it also has a lot of lobe separation. The 120-degree cam minimized torque production through most of the curve, while the 112-degree cam offered more torque but slightly less peak power. I have seen a dyno test where an engine using identical duration and lift made more peak power with a 112 LSA than a 110 LSA. If that were the only consideration, the 101 cam is the clear winner. Seeking 1/2" ID x 5/8" OD Black Exit Tubing for Radiator Overflow Reservoir. On a naturally aspirated engine, the lobe separation angle has an effect on whether the engine reaches peak torque a little earlier or later in the rpm range. 02 The 402-inch stroker short-block combined an aluminum LS2 block with a 4.000-inch crank and 6.125-inch rods. Wide LSA cams are also applicable in forced-induction applications where less exhaust overlap is required. (LOBE SEPARATION ANGLE)cam CRANES 110921 has the intake close at 45 degrees ABDC while the wider lsa CRANES 114681 closes the valves at 50.0 ABDC . As the RPM's go up this is not as critical as the higher velocity of the air/fuel moving thru keeps it from getting contaminated. A cam with a 112lobe center will idle smoother than a cam with a 110lobe center. Is There a Sequence? Lobe separations gives lots of overlap and lobe centers just happens when the grinder decides how the peak of the lobe will arrive on a specific grind by their tooling. It is the DESIGNED events that yield CENTERLINE. This has been my long time understanding! While a cam with a 108 lobe center will idle rougher. A narrower LCA will increase valve overlap and close the (intake) valve earlier, which explains the typical rougher idler and more midrange behaviour. by ANT Tue May 13, 2003 1:08 pm, Post by trmnatr Sat Dec 06, 2008 10:45 pm, Post 110 will be a bit punchier in the midrange and probalby make a little more peak horsepower as long as a good exhaust is used. For any additional clarification or questions please contact our Tech Line at 714 523-0530. https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s. The 114o lobe will add a lot more vacuum at idle. Frontal lobe epilepsy (FLE), the second most common focal epilepsy syndrome after temporal lobe epilepsy (TLE), is frequently drug-resistant and MRI-negative. Boom, you get the lobe separation angle of that engine. Has anybody experienced it/ tried it? So, this LSA is suitable for your engine and its components. The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! As usual, Marc (aka Master) is correct. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. Tight lobe separations, such as 108 or shorter, will cause the peak torque to build earlier in the RPM range and peak-out in a short amount of . 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A cam card with its myriad numbers, acronyms, and abbreviations is one red-pen stroke away from a failed math test. by mrsmythe Mon May 12, 2003 11:15 am, Post Like choosing a cam in general, the key to eliminating separation anxiety is to find the proper balance of driveability and performance. Armed with more information on camshaft theory, what will you build? Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. We will safeguard your e-mail and only send content you request. Hopefully it turns out great. I have Crane hydraulic link bar style roller lifters, so I dont have to use the spider style. by jim martin Mon May 12, 2003 7:10 pm, Post 1-4 It is one of the most common neurological disorders worldwide, 1-5 is among the most common . However, in application, there is a lot more to consider. Thanks again. A 110-degree lobe separation angle means that the peak opening points of the intake and exhaust lobes are 110 degrees apart. These numbers can vary a few inches one way or the other, depending on several other aftermarket factors and your individual engine specifications, so you may want to check your vacuum once the cam is installed. 108 versus 110 will drive the power band down. This cam also offered the highest torque output at 4,000 rpm with 522 lb-ft. Based on the peak numbers alone you might be tempted to grab the one with the tightest (108-degree) LSA, but there is more to a cam test than power. But this is not the only reason. A mobile functional near-infrared spectroscopy (fNIRS) was used to record cerebral oxygenation signals in the left prefrontal cortex (LPFC), right prefrontal cortex (RPFC), left parietal lobe (LPL), and right parietal lobe (RPL) and analyze the EC of the cerebral cortex. Some of the programs like engine analyzer pro and dynomation seem to like some of the wider lsa's.Thanks again JOE. BUT, 114 will have more vacuum at idle, which will work better with some fuelinjection. Check out the Comp Cams catalog, even the biggest hydraulic rollers use 110. I will be running an Edelbrock Performer RPM, with a Quick Fuel 750cfm with a screw adjustable vacuum secondary; it's called the Pro-vac. Good cam for a lower rpm street engine. This was science at work, and with data in tow, it was time to crunch the numbers and find out what was going on. You must log in or register to reply here. The taller lobe seperation will have a longer powerband but will have to rev higher to make the power than the lower lobe seperation! If identical and for a given displacement the 110 will give more power. Widening their separation angle helps increase upper rpm power output. Another difference between the two involves the power curve. This table will create a map in your head, and I bet it will make your understanding crystal clear. Engine knocking generally occurs when the burning of the fuel by the engine is uneven. (ICL + ECL) / 2 = LOBE SEPARATION ANGLE (LSA) LSA is a RESULT of the PROPER events. However, these rules are not absolute. indeed, expect low vacuum with anything lower than 110-ish. Our content is merely suggestive, not intended to use without proper safety precautions and advice. If a street car has smaller lift and duration numbers, they might run 112 or 114. Post As a result, a wider valve opening system with no overlapping allows more oil to fall through the oil inlet. Whatever you do, stay under 270 advertised duration and shoot for a 110 lobe separation. Tight LSA cams make excellent low-end torque and have a beautiful power curve. A cam's lobe separation determines where and for how long peak torque occurs in an engine's rpm range. The exhaust has an opening even and a closing event. It depends on the combination of engine size, head flow and head flow balance, as well as a big one, exhaust flow capabilities. JavaScript is disabled. by ANT Mon May 12, 2003 1:47 pm, Post The lower the lobe seperation,, ie. I wouldn't assume 4 links fuel requirements will mirror yours at all. This recommendation is only if you shift at no more than 7000. Most cars use more than, Read More Does It Matter Which Ignition Coil Goes Where? But, you may wonder knowing that a higher valve clearance rate reduces the chance of damaging the valve by the piston. i have a 4 bolt 351C, stock bore, 10.5 cr with 351C Boss heads ,boss crank and rods. I had an XE 274 in it. I would have to say that your cam choice sounds like a winner to me. A 232 deg duration cam with a 108 deg LCA will have the same valve overlap as a 236 deg cam with a 110 deg LCA and idle will probably be very similar. My lift will be about .580" intake and exhaust, with about 230/236 duration with a 1.7 rocker ratio, utilizing a Jesel shaft rocker system. However, the plentiful exhaust overlap (31 degrees) meant there was lots of exhaust dilution at low engine speed and high vacuum. by mrsmythe Tue May 13, 2003 5:45 am, Post It idles very well at 650 rpm with a nice lope and runs strong. As a result of this fall, the idle of the engine has to face suffering quite often. A cam 112LSA with 4 degrees advance puts the intake centerline at 108 degrees. I'd run it, just be sure to check valve to piston clearance, coil bind and retainer to guide boss/seal clearance. Simply put, the lobe separation angle (LSA) is a measurement of how the intake and exhaust lobes are phased with each other. Another important measurement was the torque production at 4,000 rpm and this cam checked in with 484 lb-ft of torque. To establish the position of each lobe, the traditional reference point is where the lobes reach max lift. 09 All testing was run through a set of 1 3/4-inch long-tube headers and 3-inch exhaust. A cam with 110 lobe center will pull approximately 14-18"of vacuum is borderline for that type of application. " - Voltaire. The other thing is that you need to tune your ignition advance to maximize your performance. Supercharged and nitrous race engines typically benefit from a wider LSA because they dont require as much overlap for exhaust scavenging as does the naturally aspirated engine, continues Bolander. And better gas mileage. Big strokers like tighter LCA but it really depends on your combo and usage, theres great OTS cams but for a custom engine a custom cam is the way to go With identical cam lobes you won't see a bit of difference. Now here is where it gets tricky. 110 LSA: You will find the complete opposite scenario here. An icon used to represent a menu that can be toggled by interacting with this icon. Engine builders Chuck Lawrence, left, and Doug Patton. Yeah but do the experiment on the dyno and tell me your intuition is correct. O onovakind67 Registered Joined Dec 14, 2001 6,242 Posts 112-110 Deg. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! As you tighten the centers ( 108 ) the same engine will make MORE power through the mide range and top end. To further minimize any dyno variations, the engine's oil and water temperatures were kept the same for each pull. Equipped with the 120-degree (LSA) cam, the hybrid stroker produced 570 hp at 6,200 rpm and 535 lb-ft of torque at 5,200 rpm. by bigjoe1 Sat Dec 06, 2008 10:48 pm, Post Because the lobes are closer together on the 101 LSA cam, the intake closing point is advanced (closes earlier) and the piston has more time to build compressionexactly what the gauge showed. A wider lobe center will give you more overall torque (comes in earlier and stays later). This overlapping has a direct influence on the oil consumption rate of the engine. 110 LSA: But, contrarily, at 110 LSA, you dont have to face the problem of engine knocking. On the cranking compression test, Brul recorded 175 psi, a 10-psi drop from the outgoing 101 cam. 238/248 duration, 300/310 adv. This may be of concern if you have vacuum assisted accessories, such as power brakes or steering. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range.
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