Good stuff. Compression test is only good for roughly comparing identical engines or the same engine at different times. It can be used as a crude indicator of engine damage. A Leak down tester is much more useful, more accurate and more specific than a compression test.
So when someone says that if you have a rs468 cam or a 30//30 or a 475 cam you can’t do 11-1 or 12 compression ratio. Your saying that you can it’s all in the tuner? And how he tunes? Great vid by the way
You can retard ignition timing and/or add fuel to deter detonation! It may not be the best solution, but it is doable....Retarding timing can move max cylinder pressure further past TDC which may lessen power....
People, if you are building an engine, you need to be aware of the dynamic compression (IMO) which will require a pressure gauge and engine math (which a calculator will be very helpful). Get it wrong and engine life will be very short - detonation kills engines. The dyno (tune) can't fix poor atomization of the fuel (which is affected by the entire flow path, and injectors), hot spots, poor cam choice, engine setup issues, auto-ignition from wrong compression, incorrect or low quality fuel, and all other contributors to detonation.
"High Dynamic Compression Ratio: Most people express compression ratios using the static compression ratio generated by the reduction in total cylinder volume (head volume + deck height volume + swept volume) from BDC to TDC. However, the dynamic compression ratio is more complex, but is a better representation of the actual compression ratio. Dynamic compression ratio uses the rod length, stroke, and rod angle, known as the rod to stroke ratio, or rod ratio for short, to determine the physical location of the piston when the intake valve closes. This begins the real measure of the compression ratio. As an example, a stock engine with a 10.5:1 static compression ratio may have a dynamic compression ratio of 8.0:1, but adding a higher duration camshaft can lower this dynamic compression ratio to around 7.7:1. This is why big camshafts necessitate higher static compression ratios, to help offset the original loss. Anything that alters the intake valve timing will also change the dynamic compression ratio."
Do you have your own channel? If not, you should! Not trying to critique your super lengthy technical writeup, but the DCR doesn’t determine what cams you can run with what CR.....it determines what octane rating/fuel your combination will require!
@@trailerparkcryptoking5213 Absolutely. That's the whole point of why I am saying that it is important to be aware of, so the build works with the intended fuel.
Why you use cyl base gaskets at all? You can do direct , youre using bew parts they are flat youll get better heat transver also. You have great knowleage! I respect u . I would use some liquid gasket .
I have to watch this again for the 5th time.
I need to understand this.
Thank you for taking the time and making these videos, I've gone down the rabbit hole and am on my 10th video only 160 to go 😅
Great topic 👏
Good stuff. Compression test is only good for roughly comparing identical engines or the same engine at different times. It can be used as a crude indicator of engine damage. A Leak down tester is much more useful, more accurate and more specific than a compression test.
George;
Thanks for all the Tech. Info!
What have been/are some of your favorite cam companys and people in the cam business through out the years?
Star Racing cams! Duh?
So when someone says that if you have a rs468 cam or a 30//30 or a 475 cam you can’t do 11-1 or 12 compression ratio. Your saying that you can it’s all in the tuner? And how he tunes? Great vid by the way
You can retard ignition timing and/or add fuel to deter detonation! It may not be the best solution, but it is doable....Retarding timing can move max cylinder pressure further past TDC which may lessen power....
very good
I feel like everything I thought I knew just got shit on. 🤔
👍####
I'll take one lol
People, if you are building an engine, you need to be aware of the dynamic compression (IMO) which will require a pressure gauge and engine math (which a calculator will be very helpful). Get it wrong and engine life will be very short - detonation kills engines. The dyno (tune) can't fix poor atomization of the fuel (which is affected by the entire flow path, and injectors), hot spots, poor cam choice, engine setup issues, auto-ignition from wrong compression, incorrect or low quality fuel, and all other contributors to detonation.
"High Dynamic Compression Ratio:
Most people express compression ratios using the static compression ratio generated by the reduction in total cylinder volume (head volume + deck height volume + swept volume) from BDC to TDC. However, the dynamic compression ratio is more complex, but is a better representation of the actual compression ratio.
Dynamic compression ratio uses the rod length, stroke, and rod angle, known as the rod to stroke ratio, or rod ratio for short, to determine the physical location of the piston when the intake valve closes. This begins the real measure of the compression ratio.
As an example, a stock engine with a 10.5:1 static compression ratio may have a dynamic compression ratio of 8.0:1, but adding a higher duration camshaft can lower this dynamic compression ratio to around 7.7:1. This is why big camshafts necessitate higher static compression ratios, to help offset the original loss.
Anything that alters the intake valve timing will also change the dynamic compression ratio."
Do you have your own channel? If not, you should! Not trying to critique your super lengthy technical writeup, but the DCR doesn’t determine what cams you can run with what CR.....it determines what octane rating/fuel your combination will require!
@@trailerparkcryptoking5213 Absolutely. That's the whole point of why I am saying that it is important to be aware of, so the build works with the intended fuel.
You are talking about torque in low rpm. If you close cam early it has bigger torque, if you close it later you have higher power ?
Why you use cyl base gaskets at all? You can do direct , youre using bew parts they are flat youll get better heat transver also. You have great knowleage! I respect u . I would use some liquid gasket .