What is the Difference Between Lift and Duration of a Camshaft
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- เผยแพร่เมื่อ 3 ส.ค. 2024
- A quick look at lift and duration of a camshaft and which one is more important. A simple illustration to explain the difference in the two and how they work together to make horsepower. This is a VERY simple way of looking at the two and not meant to be a full explanation of the two functions of a camshaft. We'll get to that in another video. This may start a new series on how a camshaft works. We'll see! Thanks for watching!
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This is what I was searching for..finally I found one..thanks for that simple and comprehensive explanation
Cool! Glad you enjoyed it!
Contacted him personally about a specific cam duration questions. He got right with me and was awesome! He really knows what he is doing and talking about!
Does he have a email or something that I can reach out to? I have some questions as well.
Thanks a lot for making it super simple, great video man, learned a whole lot
well-done...Jere Stahl explained this to me in the 1970 decade when I interviewed him for a magazine called "Pulling Power"---truck and tractor pulling. He was a genius who passed away a while back. We became lifelong friends. He was like you in that he had to explain it in laymen's terms or you would lose whoever was buying a cam and headers from him.
I’ve tried to provide the same level of explanation for all the tech videos I do. Someone who completely understands a system, part, product will be better at diagnosing issues or tuning. This way of understanding lift and duration is a brilliant way to learn it.
Got it bro! Very informative . Keep it up
Let’s get a continuation of this video
fantastic video, thanks for the knowledge
Very much appreciated. Thanks for watching!
Awesome content 🎉
I like this analogy 👌🏼very understandable
I'm serious these videos are gold man
Thank you! I never quite know if they will be useful to folks. Always appreciate your feedback.
Sweet way of explaining it.
Whoa. That's cool. Hey I learnt something today lol
Good job! lol
Ok I need help so my cam suggestions are between 286/300 Dur with 13mm/11.5 lift vs 302/292 Dur with 11.5mm/11mm which one would be better ? I’m running a high ram with a huge intake and want all the power but rev mighty high
Nice 👍 video pal. Cool 😎
Thanks!
I had my 4G94 bored, by .5mm so the compression went up from 9:5:1 to 10:5:1, I added a turbo and bigger injectors. Im adding an adjustable gear, The stock cam is 248/248. So heres some options what should I choose.
268, 272, 274, 276, 280, 288, 294, 298
Great video man! I have a 351w, gt-40 heads..timing gear set..hooker comp longtubes.. Edelbrock torker 2 intake..750dp..comp hydro lifters.. been looking at the comp cam 280h. .280.280 .512 lift. Any thoughts on how it would do? Looking for a 3.73 ls rear. Running a c4 transmission
Thanks! The 280 comp is for sure a time tested winner. Though I’d look at a hydraulic roller in its place. You’ll get the dependability of a roller and avoid all the mess that a flat tappet can cause if the right break in and long term oil use isn’t maintained. What are you using the engine for?
Well I kind of think of it as strength and reach like in a human body how far can I reach and how much strength will I have at that point I know maybe that's kind of weird but kind of reminds me of that great video thank you always looking to learn
Great video. I learned the hard way when I was only 17. Purchased a circle track cam with low hours cheap for my 64 SS Impala 327 power glide. Thing would crawl out of the hole and about 60mph take off like a rocket. How much more useless yet dangerous cam could a 17 yr old have? LOL. High lift sounds great in a hot rod but wrong duration will die out before engine can reach it's potential. Comp Cams or most any of them offer the service of directing what cam with what set-up and what you are trying to achieve. Of coarse there are the guru engine builders that offer advice beyond what cam manufactures understand. Except the entire build most be followed closely. I'm looking for a good FE builder that knows where to buy components for an aftermarket 428 SCJ. I have read all the FE gurus over the years. Except most of them only build $15,000 and up.
I wouldn’t make the assumption that cam manufacturers don’t have the same understanding as an engine builder. COMP has a very large engineering department and the best cam designer in the business. Couple that with two Spintron cells, engine dyno abs chassis dyno and the technology they create is born from those tools. The engine builder works with COMPS engine builder office to select the right cam and design the right custom grind cam based on the information provided by the machine shop. They work together, but the cam manufacturer is the one that’s created all the lobes, specs, developed the material types and put the whole thing together for the machine shop to install.
So I have a Gen 6 454 Big Block Chevy and from what I understand, the Vortec heads on it can only support so much lift, so getting a cam with the same basic lift but more duration would be a good way to give it a bump in power? Would it also affect the engines dynamic compression if the duration and valve overlap is too much?
Hello very informative video I've a 3rd 3sge dohc engine and I'm planning on up grading my cams.the stock cams are 254deg/9.8 lift for the intake and 240deg/8.2 lift for the exhaust so I'm planning to purchase the toda camshaft with duration of 264/9.0 lift for the intake and 256/9.0 lift for the exhaust so do you think that is a good cam selection for my application?your advice will be greatly appreciated thank you.
I’m not familiar enough with the Toyota platform to give you a good response. I can tell you that the change in duration is significant between the two cam sets. Is that a turbocharged engine? What tuning software are you using?
I tried out a regrind in my 5.2 Durango 214 duration 480 lift. So far the thing wont idle. But I just put it in today. Kinda choppy. Any thoughts? Maybe I should try a bigger duration?
Thank you so much. Explained very Good. I'm wanting to build a Parade Truck. The Engine is a 390fe Ford Engine. I'm wanting a really good lope, but I dont know what I need to order or explain exactly what I want. Thank you for any information you my have for me.
Most cam companies won’t like that. 😂 The car show sound is ok I guess, but generally those guys like to build horsepower. No one cares what it sounds like if it’s winning races. But if you tell them that’s what you want, you’ll get a cam with tight LSA and a lot of exhaust duration. You’ll get the sound you want but you’ll give up some HP.
@@MuscleCarSolutions Thank you so much, its a 50yr old Engine my hot Rod days are over. I just love the sound. Thanks Again. 😎😎
Hello does the same rule apply for boosted Engines ??
Will a cam that has a duration of 289/300 thump more than one that has a duration of 294/294? In other words, what affect does a different intake vs exhaust duration have on sound and performance compared to the same intake and exhaust duration.
A little bit but you’ll want a much wider separation and a tight LSA to get that “car show” thump.
Mathematically speaking if the duration is 10 sec (instead of 30 sec), and it is lifted 50 % compared to the high lift cam which is at 100 % for 5 sec, can we then say they are both identical?
Hey man I just got a Comp Cam for my ls2 6.0, I ended up getting one with a advertised duration 276/295 @ .50 lift and a 222/233 valve lift .54 /.53 ..lobe separation 112. I wanted to know if this is good choice for a cam? Would it make good power? Is it considered mild, moderate, aggressive? And will it have that nice CHOP CHOP lol
That sounds like one of their thumpr cams. The way they designed the lobes and on that split yes it will sound aggressive but comp figured out long ago how to make those cams run really strong down low. The LSA will limit the rpm but it wasn’t made to make power past 5000-5500 anyway. Not sure what you’re using it for so can’t really say if it’s a good cam for your application or not.
@@MuscleCarSolutions I’m using it on my trailblazer ss for a daily application, just wanted some power without going too aggressive and honestly I wanted it more that nice sound
A lot of things play a role with those two parameters. What rpms is the engine capable of, what compression is it running, is it N/A or forced induction? You can only increase the valve duration so much before there's overlap and the piston comes too close to TDC. You can decrease lift but force much more air through that valve with a turbo that overlapping won't be a problem and make power. You can increase valve lift, tighten timings and increase dynamic compression in a naturally aspirated engine to get more power at higher RPMs. Lift and duration mean nothing without context.
The theory remains the same. How it’s applied at the time that the cam is designed for the application will dictate what parameters will work best. Before those can be decided, there are some basic principles that need to be understood. That’s all this was. The basics, not the final recipe for a cam.
@@MuscleCarSolutions the answer i was seeking in this video was whether or not increasing the lift of an engine would affect its powerband. I concluded that it shouldn't change the powerband
Hi I have a 400 sbc that I’m wanting to put a nice mild cam that can make some power but still be street-able. It has a stock bottem end, edelbrock performer rpm intake, qjet carb, and flat top pistons. It’s around 9.5/1 compression. The heads I have are 882s which arnt the best but I plan to get better flowing heads later. That being said I can run about .450 lift. I’m just having a hard time choosing duration.
You’ll be hard pressed to find a cam with that little lift. At least an aftermarket one. Comp has a couple really tiny cams in their high energy line. Might start there. It will be a mild cam alright and your make power wish is probably a bit of a dream.
@@MuscleCarSolutions okay, what lift and duration would I need to be at?
@@jasonbuben2653 if you’re limited on the lift, you’re stuck there.
I use flat tappets so lift isn't as open as a roller but that can be overcome by duration. atleast that's how I look at it
Hello, Can you tell me if the Comp cam #21-237-4 (212374) is considered a wimpy/stock/mild/moderate/wild/insane stick? :-) Advertised duration: 280/280; at .050 inch lift: 230/230; valve lift .48/.48; separation 110 degrees. Thanks!
That’s actually a really good, snappy street cam. Needs a small stall converter if you’re an automatic guy. The 110 lobe center will help it RPM just a little. 2500-6000 is just fine for a street car. Not sure of the other equipment you have to go with it but that cam is a fun like grind to base a good street engine around.
@@MuscleCarSolutions Thank you. I'll keep it
what if the difference in duration is not so significant let say a window that opens up 100% and has a duration of 20-25 seconds compared to a window that is half open (50 percent) for 30 seconds which one would be better?
Don’t get caught up in the example. If you break it down to cam specs, what you’re asking is what would be better duration wise? The answer is simple. It depends on what you’re trying to accomplish with the vehicle. It’s always going to dictate your combination of parts to hit that goal.
Ok but leaving the window 6x more open for half the time would also flow more air
This just doesn’t seem representative of the actual trade off you have to make