Beginner Friendly Step By Step Guide On How To Degree Camshafts + Lift, Duration and Lash Explained
119.8 هزار بار بازدید -
2 سال پیش
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Dial indicator with stand:
Dial indicator with stand: https://amzn.to/3QEktIo
Degree wheel: https://amzn.to/3pjdc5e
Crankshaft adapter: https://amzn.to/3bTYvCw
Complete degreeing kit: https://amzn.to/3dt3Yk6
This video is a detailed, beginner friendly step by step guide on how to degree your camshafts on a double overhead cam engine.
The process of degreeing involves measuring various camshaft specs such as duration, lift, intake valve opening and intake valve closing, and then adjusting the camshaft to to its optimal position in relation to the crankshaft based on those specs with the goal of extracting maximum performance
Camshafts should be degreed if you have decked the head or the block as this can distort camshaft timing and reduce performance. Camshafts must be degreed if you have purchased aftermarket performance cams. Camshaft degreeing can help prevent assembly error and piston to valve contact
We will be doing the degreeing process on a Toyota 4AGE 16v engine. But the process is virtually identical on any other double overhead cam engine
As you can see our engine is pretty much bare and we have also removed the crankshaft pulley as well as the intake and exhaust. We will be rotating the engine a lot during the degreeing process so it’s mandatory that we remove the spark plugs first.
In order to degree the camshaft we of course need to access the camshaft, and to do that we need to remove the cam cover. I will be demonstrating the degreeing process on the intake cam only but the procedure is identical for both the intake and exhaust.
In order to properly perform the degreeing we will need a few special tools. The first one is a degree wheel. The second one is a dial indicator with an extension.
As you can see my indicator is equipped with a DIY extension. Although ready-made extensions of different lengths for dial indicators can be purchased in stores or online they are almost always useless for degreeing cams on DOHC engines.
An important note when it comes to dial indicators. Make sure to get a dial indicator that has enough measuring range. A dial indicator with 10mm of range will be suitable for most camshafts as most have between 7 and 10mm of lift.
The first thing we are going to do is attach the degree wheel. I’m fortunate enough that the hole in my degree wheel is smaller than my crankshaft but larger than my crankshaft pulley bolt as I can simply bolt the degree wheel directly onto my crankshaft. If this weren’t possible I would have to either purchase or make some sort of adapter.
Once the degree wheel is on we are going to find true top dead center, or the highest point of the piston’s travel. Although most engines have markings to indicate when the piston of cylinder 1 is at top dead center, these markings aren’t necessarily 100% accurate and they’re usually below the accuracy and resolution level needed for camshaft degreeing.
Now we’re going to be turning the engine while closely watching the dial indicator. When the needle starts moving it means that the piston has made contact with the tip of the extension. We’re looking for the point when the needle stops and changes direction.
Correctly placing the measuring tip onto the valve shim is by far the trickiest part of the cam degreeing procedure. This usually isn’t straightforward and a bit of trial and error is needed until the proper placement is achieved. The extension tip must not slide across the shim and it must not make contact with the camshaft lobe or the camshaft stem. If any of this occurs the readings will be inaccurate.
In order to achieve accurate readings the angle of the extension must be the same or at least close to the angle of the valve and the shim upon which it rests. Unfortunately this is impossible with a straight attachment because it results in contact between the attachment and the camshaft stem.
And this is where the welding stick DIY extension comes in. You can easily bend it a bit to achieve correct placement on the shim without contacting the camshaft stem.
Once we have achieved the correct placement we can proceed to measuring the cam specs.
We will first measure camshaft lift which determines how much the camshaft opens the valve and then we will measure camshaft duration in order to find out how long the camshaft keeps the valve open, or off its seat. Even if you know these values from your cam card it’s a good idea to verify them. It’s definitely a good idea to measure lift and duration and degree the cams in case you purchased an engine with unknown cam specs. By measuring lift and duration you can verify whether the cams are stock or aftermarket and see exactly how aggressive or mild the cams are and whether they are well matched to the rest of the engine.
A special thank you to my patrons:
Daniel
Daniel Morgan
Pepe
Brian Alvarez
Jack H
Dave Westwood
Joe C
Zwoa Meda Beda
Toma Marini
Nelson
#d4a #camshaft #degreeing
d4a is part of the amazon associates program
Degree wheel: https://amzn.to/3pjdc5e
Crankshaft adapter: https://amzn.to/3bTYvCw
Complete degreeing kit: https://amzn.to/3dt3Yk6
This video is a detailed, beginner friendly step by step guide on how to degree your camshafts on a double overhead cam engine.
The process of degreeing involves measuring various camshaft specs such as duration, lift, intake valve opening and intake valve closing, and then adjusting the camshaft to to its optimal position in relation to the crankshaft based on those specs with the goal of extracting maximum performance
Camshafts should be degreed if you have decked the head or the block as this can distort camshaft timing and reduce performance. Camshafts must be degreed if you have purchased aftermarket performance cams. Camshaft degreeing can help prevent assembly error and piston to valve contact
We will be doing the degreeing process on a Toyota 4AGE 16v engine. But the process is virtually identical on any other double overhead cam engine
As you can see our engine is pretty much bare and we have also removed the crankshaft pulley as well as the intake and exhaust. We will be rotating the engine a lot during the degreeing process so it’s mandatory that we remove the spark plugs first.
In order to degree the camshaft we of course need to access the camshaft, and to do that we need to remove the cam cover. I will be demonstrating the degreeing process on the intake cam only but the procedure is identical for both the intake and exhaust.
In order to properly perform the degreeing we will need a few special tools. The first one is a degree wheel. The second one is a dial indicator with an extension.
As you can see my indicator is equipped with a DIY extension. Although ready-made extensions of different lengths for dial indicators can be purchased in stores or online they are almost always useless for degreeing cams on DOHC engines.
An important note when it comes to dial indicators. Make sure to get a dial indicator that has enough measuring range. A dial indicator with 10mm of range will be suitable for most camshafts as most have between 7 and 10mm of lift.
The first thing we are going to do is attach the degree wheel. I’m fortunate enough that the hole in my degree wheel is smaller than my crankshaft but larger than my crankshaft pulley bolt as I can simply bolt the degree wheel directly onto my crankshaft. If this weren’t possible I would have to either purchase or make some sort of adapter.
Once the degree wheel is on we are going to find true top dead center, or the highest point of the piston’s travel. Although most engines have markings to indicate when the piston of cylinder 1 is at top dead center, these markings aren’t necessarily 100% accurate and they’re usually below the accuracy and resolution level needed for camshaft degreeing.
Now we’re going to be turning the engine while closely watching the dial indicator. When the needle starts moving it means that the piston has made contact with the tip of the extension. We’re looking for the point when the needle stops and changes direction.
Correctly placing the measuring tip onto the valve shim is by far the trickiest part of the cam degreeing procedure. This usually isn’t straightforward and a bit of trial and error is needed until the proper placement is achieved. The extension tip must not slide across the shim and it must not make contact with the camshaft lobe or the camshaft stem. If any of this occurs the readings will be inaccurate.
In order to achieve accurate readings the angle of the extension must be the same or at least close to the angle of the valve and the shim upon which it rests. Unfortunately this is impossible with a straight attachment because it results in contact between the attachment and the camshaft stem.
And this is where the welding stick DIY extension comes in. You can easily bend it a bit to achieve correct placement on the shim without contacting the camshaft stem.
Once we have achieved the correct placement we can proceed to measuring the cam specs.
We will first measure camshaft lift which determines how much the camshaft opens the valve and then we will measure camshaft duration in order to find out how long the camshaft keeps the valve open, or off its seat. Even if you know these values from your cam card it’s a good idea to verify them. It’s definitely a good idea to measure lift and duration and degree the cams in case you purchased an engine with unknown cam specs. By measuring lift and duration you can verify whether the cams are stock or aftermarket and see exactly how aggressive or mild the cams are and whether they are well matched to the rest of the engine.
A special thank you to my patrons:
Daniel
Daniel Morgan
Pepe
Brian Alvarez
Jack H
Dave Westwood
Joe C
Zwoa Meda Beda
Toma Marini
Nelson
#d4a #camshaft #degreeing
d4a is part of the amazon associates program
2 سال پیش
در تاریخ 1401/06/06 منتشر شده
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