When boost or nitrous are introduced, and engine builders contemplate choices between single-, dual- or reverse-pattern camshafts then the discussion gets muchmore technical. On a tight lobe separation, like 106-108 degrees, the engine will build torque quickly and reach its peak early. More than any other component, the cam profile determines things like idle quality, mileage, and overall driveability. 110 LSA: On the contrary, 110LSA has a higher piston-to-valve clearance rate. However, it is fixable. 1-4 It is one of the most common neurological disorders worldwide, 1-5 is among the most common . Mistakes that weaken a supercharger's performance While a cam with a 108 lobe center will idle rougher. As you can see in the graph, the 101 LSA cam actually had the highest cranking compression of the batch: 185 psi. But there is a drawback of higher cylinder pressure: higher cylinder pressure may sometimes lead to piston or piston ring problems. My duration will be about 230 degrees. And better gas mileage. However, a cam with 108 will only pull 12-16", which is not enough for power assisted accessories. Engine knocking generally occurs when the burning of the fuel by the engine is uneven. Lower cylinder pressure is advantageous for your engine. Engine builders Chuck Lawrence, left, and Doug Patton. Topping the short-block was a set of Chevrolet Performance CNC LS3 heads from Gandrud Chevrolet. The 112-degree cam (red lines) picked up much of the torque, but the big winner was the cam with the tightest lobe separation angle. Lobe Seperation | Ford Muscle Cars Tech Forum What Is the SBC Header Bolt Torque? Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! 112-110 Deg. A wide lobe seperation is not always better than a narrow one, or vise versa. Also, the wider LSA contributes to chassis stability in drag racing by avoiding the delivery of a ferocious blast of power that would break tire traction. A good amount of idle vacuum or increased idle vacuum found at 110 LSA advances the engines efficiency. Whats a good LOBE Separation for nitrous | Yellow Bullet Forums This recommendation is only if you shift at no more than 7000. If identical and for a given displacement the 110 will give more power. indeed, expect low vacuum with anything lower than 110-ish. to use this representational knowledge to guide current and future action. 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Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. by ANT Mon May 12, 2003 1:47 pm, Post If that were the only consideration, the 101 cam is the clear winner. Brul slid the 113-LSA cam, the widest of the test, into the engine's heart and set about putting all the pieces back in place. 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. The lower the lobe seperation,, ie. Now its not shifting into 3rd and you are here. Come here to talk with others who like to drive fast. More over-simplifications: I've seen that Webcam cams can be ordered with either of the above. I would have to say that your cam choice sounds like a winner to me. I though my car would have a nice rough idle with the solid cam with a tight LSA I put in my car, its go a slight lope to it, but it pulls hard. I don't think your duration figures are too outlandish and with the tight LCA and high lift, it should make some big torque. Unfortunately, good street manners are often at odds with performance, as wilder cam timing usually decreases idle and (low-speed) driveability. 09 All testing was run through a set of 1 3/4-inch long-tube headers and 3-inch exhaust. turbo camshafts lobe centers and lobe separation Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! Next up was the 112-degree cam, which actually lost out in peak power slightly to the 120-degree cam, but offered considerably more torque. A cams Lobe center angle equals intake centerline plus exhaust . Comparison Table Between 106 Vs 110 Lobe Separation Angle. JavaScript is disabled. If that accessory still does not assist the cam in producing enough vacuum, then as a last resort you can use a vacuum pump. This is very critical for manifold vacuum, throttle response, emissions, and gas mileage. How To Properly Replace Ignition CoilsContinue. . 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. BUT, 114 will have more vacuum at idle, which will work better with some fuelinjection. Higher overlapping lets less oil fall through the oil inlet. It is the average centerline between both lobes and expressed in degrees ranging from 95 on the extremely narrow/tight side to upward of 120 on the wide end. 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. However, the plentiful exhaust overlap (31 degrees) meant there was lots of exhaust dilution at low engine speed and high vacuum. Myoinositol reduction in medial prefrontal cortex of obsessive Noah knows a lot about whats happening in the car industry with the latest piloting productions thanks to his professional experience. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. 10 Tuning the timing curve and fuel from the 42-lb/hr FAST injectors was handled by this Holley HP management system. An icon used to represent a menu that can be toggled by interacting with this icon. lobe separation angle | For A Bodies Only Mopar Forum The tighter the lobe center, the lower the RPM range; the wider the lobe center, the higher the RPM range. I've seen a few comments in threads on here that have said things like "going to the 112LC from the 108LC gives 4lbft more torque at the bottom and 2bhp more at the top" yet this would seem to go against what webcam say on. The LSA, or lobe separation angle, is ground into the cam and cannot be changed. 106 LSA: At this LSA, the car machine has to confront the reduction of idle vacuum rate quite often. Thanks again. For Example: A 110-degree lobe separation means that the peak opening points of the Intake and Exhaust lobes is 110 degrees apart. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open.. Lobe seperation cant be seperated from duration,the 2 are connected.the old duntov cam had a lot less duration than many new cams so the valve overlap was not extreme and the engine ran with a gentle lope.Increase the duration by 20* and this cam would shake a 283 out of the car at idle,but then increase the lobe seperation by 4* and the motor will have a gentle lope again. 106 LSA: 106LSA results in a decrease in piston-to-valve clearance. When you don't have any overlap, you can't have any wave tuning. Lobe Separation Angle. - 332-428 Ford FE Engine Forum Changing the lobe separation angle changes the amount of overlap that exists during the time the intake and exhaust valves are both open, echoes Doug Patton of Pro Line Race Engines. 106 LSA: You can see an increasing EGR effect at 106 LSA. I just bought a 86b Webcam and Im using 1.5's. On the cranking. Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by, http://www.webcamshafts.com/cam_glossary.html, http://www.newcovenant.com/speedcrafter haft/3.htm, Webcam 86A 108LC w/1.5 vs 86B 112LC w/1.3s. The idle quality was better with the 112-degree LSA but not as good as the wider 120-degree cam.The ultra-wide 120-degree LSA lost low-speed power and never recovered, but know that this wide LSA is often beneficial on positive displacement, supercharged applications. Meaning the lower lobe seperation will have a very quick and fast powerband (Snappy!) by ANT Tue May 13, 2003 1:08 pm, Post Mechanical aspects like maximum torque, narrower powerband, higher cranking compression rate, efficient compression rate, effective EGR effect, and lower oil consumption rate increase the car engines efficiency and make it energy efficient. 04 Minor modifications to the factory windage tray were necessary to work with the new stroker assembly. Tight LSA cams make excellent low-end torque and have a beautiful power curve. 2023 Power Automedia. Moreover, a user from the Chevelle forum said. I think that cam had 110 lobe sep. Im loking at a summit cam with close to the same lift and duration #s but 114 lobe sep. The only reason the advance or retard a camshaft profile is to get the timing events where they need to be. 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What do you think of this cam choice? | Chevy Nova Forum The 402-inch LS2/LS3 hybrid stroker started out with an LS2 aluminum block. 110 LSA: On the contrary, it is pretty unpleasant to inform you that the efficient compression rate decreases at 110 LSA. 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. I have used some cut on a 110 that worked well too, but they never sounded as good as the tight ones. by jim martin Mon May 12, 2003 7:10 pm, Post 108 Lobe Separation These are my motors specs 1979 - 347 Stroker 10:1 Compression Holley 670 Street Avenger or a Holley 650 (I have both) Roush 200 Cylinder Heads (minor head work) 1.6 Roller Rockers Shorty BBK Headers 373 Rear End 5 Speed Transmission Cross Gap Intake (Power Band 1500-6500) FlowMaster Dual Exhaust (of course no Cats) MSD 6Al 106 LSA: At 106 LSA, the cylinder pressure is a bit higher. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. The 114 cam will give more low end torque, good midrange, less power up high. Increased Effective Connectivity of the Left Parietal Lobe During If two cams are identical with the exception of lobe separation angle (we'll say 108 and 114) the cam with 114LSA will make more low end power than the 108LSA cam? 03 The 4.000-inch crank and 6.125-inch rods were combined with a set of forged asymmetrical pistons from JE. Save my name, email, and website in this browser for the next time I comment. Exhaust reversion is another undesirable side effect that can be caused by overlap. This is ground into the cam and can't be changed without changing cams. by trmnatr Sat Dec 06, 2008 10:45 pm, Post Looking at 108vs. = Extremely Tight . You can research your heads to find out where yours are, but honestly I don't think it will be worth the effort on a tow vehicle. It is possible to advance and retard the timing events, but the distance between the centerline of the lobes will remain constant. The graph above compares intake valve closing points of the three cams used in the test. by farmer Mon May 12, 2003 3:14 pm, Post For a better experience, please enable JavaScript in your browser before proceeding. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Widening their separation angle helps increase upper rpm power output. 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. Need some Cam Advice! | Chevy Tri Five Forum However, finding them might be challenging if you dont have any prior knowledge. 292S-112: 292/292 - 240/240 - .495/.495 - 112* - 3400-7200. by Paul H Tue May 13, 2003 1:24 pm, Post I personally prefer to sacrifice the small amount more power for better idle quality.
108 vs 110 lobe separation
108 vs 110 lobe separation
