The engine has AFR heads, Crane rockers, a TCI balancer, a Scat Rotating assembly with Mahle pistons, an Edelbrock RPM Air-Gap intake, an MSD ignition, and an Aeromotive fuel system. by mrsmythe Wed May 14, 2003 2:26 am, Post VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I wouldn't assume 4 links fuel requirements will mirror yours at all. Ultimately, it makes the 110 LSA an oil-consuming LSA. 11 Doing LS cam swaps on the engine dyno is a breeze, each taking less than 1 hour. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. Camshaft: Hydraulic Roller, Comp Cam custom grind (ADV Duration 281-287,@ .050 230-236, lift 622I & 625E w/1.6 rockers.) But an interestingly shocking fact is that this event escalates the air-fuel mixtures reaction rates, causing temperatures to rise and causing the problem of overheating the engine. Before getting to the cam profiles, we had to make sure we had a reasonable test engine. The piston and cylinder damage possibility is pretty low at 110 LSA. I have Crane hydraulic link bar style roller lifters, so I dont have to use the spider style. 108 vs 112 lobe seperation. I am pretty sure, right now, you find yourself in the middle of the rising debate of 106 vs 110 lobe separation angle. 2.1.3 Transponder reply modes (air-to-ground) 2.1.3.1 Transponders shall respond to Mode A interrogations in accordance with the provisions of 3.1.1.7.12.1 and to Mode C interrogations in accordance . 110 LSA: But, contrarily, at 110 LSA, you dont have to face the problem of engine knocking. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. not exactly true, Ive seen custom grinds that are on 108 lca, smooth idle, high vacuum an even able to run efi, usually on an off the shelf cam it is true. so it is a solid flat tappet, torker intake, 1" 4-hole tapered spacer and 750 carb (QFT) transmission is a wide ratio toploader, rear is a 9" 3.89 geared 26"rear tires. Camshafts with a substantial overlapping tendency should not be used in vehicles driven on public streets. The 114 cam will give more low end torque, good midrange, less power up high. The stock valvesprings supplied with the CNC LS3 heads were swapped out in favor of a set of dual springs from Brian Tooley Racing. The Fora platform includes forum software by XenForo. The result sounded wonderful, but it didnt rev as enthusiastically and it made 30 less horsepower than normal, says Lawrence. The higher the compression and the higher you try and rev it, the more it will like a wider lobe center. It also depends on displacement, some guys will run a bigger cam and widen the LCA to give a better idle but in my opinion it kills power. 106 LSA: You can see an increasing EGR effect at 106 LSA. Increased overlap improves upper RPM power. On larger displacement units 116 to 118 degrees of separation are common. The Fora platform includes forum software by XenForo. In general, a stock replacement camshaft with duration of less than 200 degrees will have a lobe separation angle of more than 114 degrees. As boost increases, the air will be forced through the cylinder, vs. being trapped in the cylinder. On the cranking compression test, Brul recorded 175 psi, a 10-psi drop from the outgoing 101 cam. Also present during testing was a set of 1 7/8-inch Kooks headers, Comp hydraulic roller lifters, and F-body oil pan. Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. It will also give you a smoother idle and probably even better gas mileage. But, after comparing these two LSA based on a few mechanical aspects, such as maximum Torque, RPM, powerband, oil consumption, and many more, you will find the 106 LSA with better performance output. I'd run it, just be sure to check valve to piston clearance, coil bind and retainer to guide boss/seal clearance. 3.75" stroke= 108 LSA 4.00" stroke= 110 LSA 4.25" stroke= 112 LSA 4.50" stroke= 114 LSA I can see exactly where his theory is coming from. The lower the lobe seperation,, ie. This causes the engine's street manners and tuning to become fickle. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. JavaScript is disabled. But, the narrow or broad powerband choice varies from person to person. One segment that truly benefits from a wider LSA is the marine marine market. This is very critical for manifold vacuum, throttle response, emissions, and gas mileage. But, you may find a lobe wider than a 120-degree angle in any car engine.But, I must let you know that those are customized car engines prepared for any special purpose, such as racing, drag racing, off-road riding, or performing stunts. The tighter the lobe separation angle, the peakier the power curve will be, confirms Bolander. The lobe separation angle is a comprise of what the engine needs depending on the compression, combustion chamber, rpm, engine size, head volume, and many, many other variables. 110 LSA: On the contrary, it is pretty unpleasant to inform you that the efficient compression rate decreases at 110 LSA. = Tight Below 104 Deg. 12 In terms of power production, the stroker LS3 performed best with the tightest lobe separation angle. What Are The Wastegate Stuck Open Symptoms? Maybe even 114. It depends on the combination of engine size, head flow and head flow balance, as well as a big one, exhaust flow capabilities. You get a better idle, vacuum, and response from a 112o-114o lobe. Now lets move to the exhaust. I just bought a 86b Webcam and Im using 1.5's. It had a robust powerband with tons of usable torque. The 402-inch LS2/LS3 hybrid stroker started out with an LS2 aluminum block. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open. The engine would idle a lot rougher and generate worse exhaust emissions largely because of unburned fuel.. Wide LSA cams are also applicable in forced-induction applications where less exhaust overlap is required. How do the lobe separations change when you factor in turbocharging? Thanks for the replies so far. Aluminum flywheel & pullies. Most cars use more than, Read More Does It Matter Which Ignition Coil Goes Where? = Moderately Tight 106-104 Deg. 106 LSA: The overlapping is higher as 106 LSA is comparatively tighter LSA than 110 LSA. So, choose the perfect lobe separation angle for your engine, complying with the requirements of your needs. (You can find an instructional video of how to do just that on our Clay Smith Cams YouTube Channel;https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s ). 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. This cam split the difference between the 101 and 113 down the middle, and in theory should have walked the line between the results of the last two tests in every waywhich it did. 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All testing was performed with an Aeromotive fuel pump feeding a set of 42-lb/hr injectors. Higher lift and longer duration profiles add power, but do so at higher engine speeds (especially true of duration). The reduced rate of the EGR effect lowers oxygen circulation in the engines combustion chamber. With a 108 degree lobe center, a cam will have a rougher idle and produce less vacuum due to more overlap. 09 All testing was run through a set of 1 3/4-inch long-tube headers and 3-inch exhaust. You can modify the lobe center a little bit but not enough to change the actual overlap of the grind. Exhaust reversion is another undesirable side effect that can be caused by overlap. Performance Distributors Keeps The Spark Alive With SOS, A New Diesel Piston That Increases Power And Reduces, Shop Tour: Brian Tooley Racing Expands To Be A One-Stop, Melling Offers New Timing Kits for Ford 4.6L and 5.4L SOHC, Reborn Retro Blower Packs Positive-Displacement Power For Fox, EngineLabs Tool Of The Month: Summit Racing Lb-In Torque, Why You Should NOT Emissions Delete Your Diesel, Can A Cold Air Intake Really Help Your Trucks, Ask The Expert: We Want Your Questions For Canton Racing, The Answers: DeatschWerks Responses To Your Fuel System, SEMA 2022: GEARWRENCH Leveled Up With Distinct Quality Hand, EngineLabs Tool Of The Month: Summit Racing AN Wrench, HOLY SHIP! 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. Also If you go with 112 lobe centers, you create less valve overlap which will increase your compretion. 04 Minor modifications to the factory windage tray were necessary to work with the new stroker assembly. It creates an unsteady manifold vacuum condition that, on a fuel-injected engine, confuses manifold air pressure (MAP) sensors, making it hard for them to regulate fueling. I probably would have gone with 3.55 gears had I knows better.. 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. That way you can discuss what you want from the engine and how changes in LSA or any of the other specs will affect how the engine performs. Similarly, 110 LSA is also found to be a more fabulous performer in several mechanical aspects. The Crane has a smoother idle, broader power band, and . so the power will come on a litter sooner with the 114, and fall off a little sooner? Lobe separation angle does. Is There a Sequence? 110 degrees on the lobe separation angles. I personally prefer to sacrifice the small amount more power for better idle quality. That was all, and we have already reached the concluding point. We will safeguard your e-mail and only send content you request. Some prefer a narrow powerband, and some prefer the broader one. Test 1 was easy. "When the low-pressure wave in the exhaust reflects into the intake, the pressure delta actually helps pull air and fuel into the cylinder. The balance of midrange torque and top-end horsepower lends this LSA range to the majority of street/strip engines. For a better experience, please enable JavaScript in your browser before proceeding. However it is at the expense of a small amount of bottom end power and idle quality, due to the increased overlap. Making this the biggest obstacle to overcome when selecting a cam profile with one of our tech advisors, explaining the definition and importance of the Lobe Center. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open. . This form of short-term memory is supported by the prefrontal cortex (PFC) and is believed to rely on the ability of selectively tuned pyramidal neuron networks to persist in firing even after a to-be-remembered stimulus is removed from the environment. A 112-114 degree lobe center will have a better idle and produce more vacuum with less overlap. But nothing comes without a cost, and idle vacuum suffers as LSA shrinks. So, without wasting any moment, lets find out the answer. you cannot just take a random change in a lobe separation angle and say 1 is better than the other. To establish the position of each lobe, the traditional reference point is where the lobes reach max lift. For a better experience, please enable JavaScript in your browser before proceeding. 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. by ANT Tue May 13, 2003 1:08 pm, Post The graph above compares intake valve closing points of the three cams used in the test. 110 LSA: On the contrary, at 110 LSA, the engine fails to reach the maximum torque, resulting in a decrease in torque rate. I've heard similar cams (only about 5*'s off) and they have a nice rumble to them. 68 Mustang, 306, AFR 185\'s, CI cam, FPA\'s, Bigs 650 DP, T5Z, 9" w/4.33's. However, finding them might be challenging if you dont have any prior knowledge. It's wet flow tested at 690cfm. All three terms are similar, as they all relate to the relationship between the centerline of the Intake lobe and the centerline of the Exhaust lobe. In my opinion, the rougher the idle the better! Average power was also down, but the engine pulled ahead of the 101 cam at 5,400 rpm, picking up 6.5 hp at peak. But, you may wonder knowing that a higher valve clearance rate reduces the chance of damaging the valve by the piston. Valve lift will bear weight in any decision regarding LSA. by Kdub Sat Dec 06, 2008 11:05 pm, Post LSA CAM TEST-108 vs 112 vs 120 Richard Holdener 239K subscribers 168K views 2 years ago WESTECH PERFORMANCE GROUP FULL RESULTS-CHANGE ONLY LSA-LS CAM TEST. music to your ears? 110 LSA) and Crane's #341191 (238/248, .563"/.587", 114 LSA), display considerably different characteristics. Now that we have a basic understanding of lobe separation angle, we can put together a test to illustrate just what happens when you make changes to it. O onovakind67 Registered Joined Dec 14, 2001 6,242 Posts 108 versus 110 will drive the power band down. 110 LSA: On the contrary, if you look at the powerband at 110 LSA, the powerband is comparatively broader. You cannot look at just the LCA without looking at other specs too. I know a little about cams. 106 LSA: So, if I talk about the powerband at 106 LSA, the powerband is narrow. With the first cam loaded in the engine (the 101 LSA) Westech's Steve Brul made three dyno pulls, the average of which was saved to compare to the next cam. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. We do not stock profiles with 109 or 114 lobe centers. 03 The 4.000-inch crank and 6.125-inch rods were combined with a set of forged asymmetrical pistons from JE. pump gas, no additive's as well, runs good, i will put the highest octane in, which is 93.. Split duration/lift only helps when your intake/exhaust ratio is low on the exhaust side. 106 LSA: On the contrary, if we look at the 106 LSA, we will find it more advantageous and energy efficient than the 110 LSA engine. Generally, naturally aspirated engines run narrower lobe separation angles of around 106 to 108 whereas supercharged, turbo or nitrous engines operate with 112 to 114 and higher. NOTE: Classic Inlines stocks the above profiles in 108, 110, and 112 lobe centers. 110 for sure. But i would nt go any wider than 110. After the next three pulls, it was clear the 113 cam was way down on low-end torque. As usual, Marc (aka Master) is correct. The intake lobe centerline is measured in crankshaft degrees. Alternatively, if you are running a bigger camshaft to gain maximum top-end power, cam makers often suggest reducing the lobe separation angle to recover power lost in the lower rev range.. by randy331 Sat Dec 06, 2008 10:00 pm, Post lobe centers and lobe separation are 2 different things . As you can see in the graph, the 101 LSA cam actually had the highest cranking compression of the batch: 185 psi.
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