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Swaping my 351 cleveland for 408w stroker
#71
(11-26-2018, 09:07 PM)barnett468 Wrote:
(11-26-2018, 08:12 PM)barnett468 Wrote:
(11-26-2018, 02:16 PM)EvilPuppetMaster Wrote: I found this on another forum... This guy had the same question and i guess result is going to my favor:
This is what he wrote:

I figured out the reason for the difference. The Comp Cams XE series is based on .0006 lift, where the Lunati VooDoo numbers given for valve events is at .050 lift. So I need to obtain the advertised numbers from Lunati to be able to get an idea of what my dynamic compression will be.
From doing some searching, I believe it will comparable to the XE (around 63 degress ABDC) which would put me right around 8.5:1 dynamic CR.
I knew the 42.5 ABDC wasn't right, it had my DCR over 9.5:1, I don't think there is a pump or race gas available to handle that.

Does this make sense? Using your ABDC calc this would bring me to 8.5 dynamic CR which is great

Alex

The dynamic compression changes throughout the rpm range and is affected by several factors including ivc, overlap, lobe profile (ramp angle), header type, and amount of scavenging that is occurring etc, therefore, not even a sophisticated computer dyno program can accurately determine what it will be but they can give a general idea and are useful for comparative purposes. 

The more volumetrically efficient and engine is, the higher the dcr will be.

The potential for engine "ping" is also determined by the load on the engine which can be reduced with numerically higher gears if all else remains the same.
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#72
(11-26-2018, 09:11 PM)barnett468 Wrote:
(11-26-2018, 09:07 PM)barnett468 Wrote:
(11-26-2018, 08:12 PM)barnett468 Wrote: The dynamic compression changes throughout the rpm range and is affected by several factors including ivc, overlap, lobe profile (ramp angle), header type, and amount of scavenging that is occurring etc, therefore, not even a sophisticated computer dyno program can accurately determine what it will be but they can give a general idea and are useful for comparative purposes. 

The more volumetrically efficient an engine is, the higher the dcr will be.

The potential for engine "ping" is also determined by the load on the engine which can be reduced with numerically higher gears if all else remains the same.
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#73
That's some great info there... 
Thanks for all your help. Just ordered everything I need so will let you guys know after the initial cam break in.

I believe it will take engine shop guys few months to build it so stay tuned

Alex
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#74
(11-26-2018, 09:30 PM)EvilPuppetMaster Wrote: That's some great info there... 
Thanks for all your help. Just ordered everything I need so will let you guys know after the initial cam break in.

I believe it will take engine shop guys few months to build it so stay tuned

Alex

That info is the reason I mentioned that you would be safe with 9.3 static compression with that cam in your app instead of giving you a dynamic compression number.
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