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It will all be listed on the cam card. It's impossible for anyone to calculate the DCR without knowing the duration, LSA and advance. The IVC is critical on calculating DCR.
With an SCR of 11.56 and a 225 intake, 114+3 cam I got something like 8.96DCR. Starting with higher SCR and a bigger cam is fine but you'll be in the 93OCT required range for sure unless you are running a really low LSA to bleed off the compression.
It will all be listed on the cam card. It's impossible for anyone to calculate the DCR without knowing the duration, LSA and advance. The IVC is critical on calculating DCR.
With an SCR of 11.56 and a 225 intake, 114+3 cam I got something like 8.96DCR. Starting with higher SCR and a bigger cam is fine but you'll be in the 93OCT required range for sure unless you are running a really low LSA to bleed off the compression.
okay, I got my cam specs and figured the intake closing point at 52. This leaves me with a 10.35:1 dynamic. This will be too much compression for pump gas won't it?
okay, I got my cam specs and figured the intake closing point at 52. This leaves me with a 10.35:1 dynamic. This will be too much compression for pump gas won't it?
If your IVC is 52 ABDC @.050", then you need to add about 27 to that number. The dynamic calculators are designed to work on seat timing or timing at .006" for a hydraulic camshaft which is about 25-28 more depending on the lobe. So, in your case, use about 79 for your calculation.
Use the wallace racing cam degree calculator to determine IVC ABDC if you don't already have that on your cam card. Use the advertised duration when typing in the duration figures.
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If you are using a computer, you can use the free Cam Motion Cam Timer download. It is a lot more versatile than web based apps as you can change any parameter and all of the others update to match. You can also have more than one up on the screen at a time so you can compare multiple scenarios. You can also use advertised duration or duration at .006" if you have those available. Download it free here:
If your IVC is 52 ABDC @.050", then you need to add about 27 to that number. The dynamic calculators are designed to work on seat timing or timing at .006" for a hydraulic camshaft which is about 25-28 more depending on the lobe. So, in your case, use about 79 for your calculation.
Thanks! if that's right then it will be right at 8.35:1 and I should be good
If you are using a computer, you can use the free Cam Motion Cam Timer download. It is a lot more versatile than web based apps as you can change any parameter and all of the others update to match. You can also have more than one up on the screen at a time so you can compare multiple scenarios. You can also use advertised duration or duration at .006" if you have those available. Download it free here:
I'll download it now. Thanks! http://www.cammotion.com/cam-timer.php
Hi Dalton, I use EAP Pro from Performance Trends.
I do this for free, just send your details.
I ask the reason for your request ?
Lets agree it's about Knock Rating ?
There are some factors OFTEN NOT ASKED :
The Local Operation Altitude ?
The Rod Length vs Stroke ?
The Crank Shaft Target Wheel tooth count (24 or 59 ) ?
The Piston to Head Squish Distance ?
The Piston Pin Offset if any ?
The Normal Operational Coolant Temperature ?
The Camshaft Timing AS ASKED, I would use Split Overlap ?
(2.5/2.5)
06-29-2017, 06:42 PM
Dynamic compression 
