108 vs 110 lobe separationimperial armour compendium 9th edition pdf trove

108 versus 110 will drive the power band down. Well, it is quite a natural event that you may not find the lope separation angle mentioned at the engine body. To overcome this inherent problem in wide LSA camshafts, you simply need a higher-flowing intake port. Tests 2 and 3 meant dissecting the motor on the dyno to get the old cam out. 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. Valve lift will bear weight in any decision regarding LSA. I'm surprized at these questions as well as some of the replies. " If you take any of the . I also like the 106 lobe separation with the intake on 103. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. More over-simplifications: by mrsmythe Mon May 12, 2003 11:15 am, Post In a blower motor when the valve timing events are where they need to be the lobe sep will usually wind up in the 114-115 range on most Combos. dur. The engine would idle a lot rougher and generate worse exhaust emissions largely because of unburned fuel.. While a cam with a 108 lobe center will idle rougher. However, these rules are not absolute. you cannot just take a random change in a lobe separation angle and say 1 is better than the other. that is why people running 112 or 114 lobe centres retard the cam ,that way the exhaust event is back were it was before .this helps in exhaust valve tempatures--anyway today i talked too barry who is the owner of shadbolt cams and we talked about cam lobe centres -he considers 108 centre quite narrow and for a very narrow power band operation ,with a 112 he figures with the carbs with straight & even runs at the valves there should be no noticable loss of low end power, a 112 lobe would be a great choice for a great street strip motor -better lower torque followed with a flatter rising torque curve as well as rpm range extended 500-700 rpm -. 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. by 3V Performance Sat Dec 06, 2008 4:38 pm, Post After swimming through the entire article, I hope you are now well aware of the 102 vs 110 lobe separation angle. Post The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. Lower cylinder pressure is advantageous for your engine. This is ground into the cam and can't be changed without changing cams. I personally prefer to sacrifice the small amount more power for better idle quality. Hopefully It will do fine in my 2276 mostly drag bug. For any additional clarification or questions please contact our Tech Line at 714 523-0530. https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s. by flat4racer17 Mon May 12, 2003 1:40 pm, Post 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. Test 1 was easy. I'm sorry to disagree with that incredibly well written article, but lobe separation by itself is absolutely freaking meaningless. Some prefer a narrow powerband, and some prefer the broader one. In my opinion, the rougher the idle the better! So, you can enjoy a mighty acceleration power at 110 LSA. 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. GRIND #: CRB3 3194 /3196 HR111. by Hoxviii Mon May 12, 2003 7:50 pm, Post Looking at 108vs. music to your ears? 106 LSA: As you know, the intake and exhaust lobes centerline distance is known as lobe separation angle. Whatever you do, stay under 270 advertised duration and shoot for a 110 lobe separation. so the power will come on a litter sooner with the 114, and fall off a little sooner? If the intake valve opens too early, it will push the new charge into the intake manifold. With minimal overlap and a steady manifold vacuum signal, they work great with fuel-injection systems and are the norm on modern pushrod engines, such as the LS and Gen III hemi. Good luck. A cam with a 112lobe center will idle smoother than a cam with a 110lobe center. Your email address will not be published. by ANT Thu May 15, 2003 6:44 pm, Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by phpBB Forum Software phpBB Limited. If you changed the lobe separation of a street engine from 112 degrees to 106 and didnt do anything else, adds Kaase. Howards Cam Vs Comp Cam: Which Is The Best Option For You? by trmnatr Sat Dec 06, 2008 10:45 pm, Post When choosing a cam, power gains shouldn't be the only consideration. A narrow, more specific power band is also a product of a narrow LSA, as is a lumpy idle qualityoften referred to as the 106 sound. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. 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.. Now here is where it gets tricky. Frankly cams with a 108-114 lca unless in the perfect combo you won't usually see more than 15hp and you won't really feel the difference except for either a peaky or broad power band. Well get out of that stocker and build a hipo motor for your VW. by randy331 Sat Dec 06, 2008 10:00 pm, Post Things like idle vacuum, fuel economy, and tuning all factor into picking the right cam. Comp cam hydraulic roller lifters. I probably would have gone with 3.55 gears had I knows better.. Like choosing a cam in general, the key to eliminating separation anxiety is to find the proper balance of driveability and performance. If identical and for a given displacement the 110 will give more power. Despite no changes in lift or duration, this cam sounded much more aggressive than the other two with wider LSAs. 08 Additional components used to build the stroker included a set of Comp hydraulic roller lifters, ARP head studs, and a new oil pump. or just enough to keep the neighbors pissed? All rights reserved. 554"/577" lift. Well, there can be different reasons for this problem. Well, If I am not mistaken, you must be looking for which angle has what impact on your engine or which would be the best. 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. Compression willl be 9.75:1. Ed JTO learn to park Joined May 31, 2009 180 Posts 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 will be running an Edelbrock Performer RPM, with a Quick Fuel 750cfm with a screw adjustable vacuum secondary; it's called the Pro-vac. Many later model engines use wide lobe separation angles to reduce overlap for idle quality and fuel economy. For your convenience, I am providing a comparison table to give you an overall idea about the comparison. Another related thought to consider when selecting a cam is inches of vacuum for your engine application when deciding upon a Lobe Center. For a better experience, please enable JavaScript in your browser before proceeding. I wouldn't assume 4 links fuel requirements will mirror yours at all. http://www.mustangworks.com/cgi-bin/moi-display.cgi?220, http://www.popularhotrodding.com/en6em_camshaft_specs/lobe_seperation_angle.html. It really comes down to the application. JavaScript is disabled. A cam with a 112 lobe center will pull approximately 16-20" of vacuum, which is good for power brakes. 02 The 402-inch stroker short-block combined an aluminum LS2 block with a 4.000-inch crank and 6.125-inch rods. by farmer Mon May 12, 2003 3:14 pm, Post Our content is merely suggestive, not intended to use without proper safety precautions and advice. As you tighten the centers ( 108 ) the same engine will make MORE power through the mide range and top end. I forgot to add that poor vacuum is not much of a concern to me because I have no power accessories. The 110 is probably a better choice for a performance street engine. It is the angle that separates the intake and exhaust lobe for a particular cylinder, and is measured in camshaft degrees. 2023 Power Automedia. 110 LSA: However, if you look at the rate of cranking compression at 110 LSA, you will find a reduced compression rate from the standard cranking compression PSI level. Another difference between the two involves the power curve. Yeah but do the experiment on the dyno and tell me your intuition is correct. A 112-114 degree lobe center will have a better idle and produce more vacuum with less overlap. And better gas mileage. also,, wider will produce a wider and more flat torque curve that doesn't fall off as abruptly up top rpms. A wider lobe separation angle can often provide more power, but it can also lead to more wear on the engine. . The takeaway from this test is camshaft LSA is a double-edged sword. by jim martin Mon May 12, 2003 7:10 pm, Post Here are the basics: higher lift values open the valves to increase airflow and longer duration keeps the valves open longer. If you drew a line that divided the intake lobe in half right at the point of maximum lift, then did the same to the exhaust lobe, then measured the distance in cam degrees between the two, that would be the lobe separation angle. Realize what the engine is going in, however, as you may not be able to use the wildest cam out there. That notion is completely false. They also reduce stress on the outdrive. Ultimately, it makes the 110 LSA an oil-consuming LSA. dont sound like a verry street friendly motor butany thoughts? 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. Thanks. It will sound lovely I'm sure. I think you are asking a lot of a cam . This table will create a map in your head, and I bet it will make your understanding crystal clear. Since we were only changing the lobe separation angle, we had to make sure every variable (air/fuel, timing, water, air, and oil temps) was identical during testing. The taller lobe seperation will have a longer powerband but will have to rev higher to make the power than the lower lobe seperation! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. To reiterate another point, I realize that wider LSAs tend to broaden the power band, but for a car I would like to bracket race a bit, as well as enjoy on the street, I was told that a narrower LSA will help the car accelerate at a faster rate. I've seen that Webcam cams can be ordered with either of the above. The balance of midrange torque and top-end horsepower lends this LSA range to the majority of street/strip engines. 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. Also If you go with 112 lobe centers, you create less valve overlap which will increase your compretion. 108* or narrower lobe separation angle (LSA) is "Narrow" and 114* or wider (up to 117* or 120* for stock cams) is "Wide" , with 110 to 112* being the "normal" hot-rod cam.

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