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Does this ,make sense? Cam/CR
https://slantsix.org/forum/viewtopic.php?t=25259		 Page 2 of 2
Author:  sandy in BC [ Tue Oct 09, 2007 6:14 pm ]
Post subject: 
Thanks Greg....



But....my adv intake closing is 71

Adv ex dur is 270

Lobe sep is 109....ground 2 deg advanced

Intake opens 29 btdc closes 71 deg
exhaust opens 62 atdc closes 28 deg

overlap 57 advanced 2deg

Bore is 3.466

Total cc is 71 ( I think...)
Author:  gmader [ Tue Oct 09, 2007 7:51 pm ]
Post subject: 
I went by the standard Erson 280 specs, as posted elsewhere. let me run this again for you.
Author:  gmader [ Tue Oct 09, 2007 8:04 pm ]
Post subject: 
Image

Here is the final result, based on what you posted. I zeroed out the amount you are in the hole, as well as the gasket thickness.

Regardless, the calculations are looking a lot different from what you posted from the web based calculator gizmo.


The reason that I am so interested in this is because it appears there is a lot of differences in how this can be calculated. I researched this a lot during the Bren/Eileen timeframe, to better figure out what was real in planning my own engine build.

Greg
Author:  sandy in BC [ Wed Oct 10, 2007 4:51 am ]
Post subject: 
Using those same #s on the web based calc I got DCR of 7.84.....

I still think I need to take out about 5-6cc to end up at 10:1 CR and a DCR around 7.75

Im tempted to go to a 62cc /10.5 DCR 8 setup


Out of town till Sat.....
Author:  sandy in BC [ Sat Oct 13, 2007 2:28 pm ]
Post subject: 
Highway time provides room for thought....

I think Lou is suggesting advancing the cam about 6 degrees so the intake closes sooner. This would increase DCR without milling.

Time to run some more numbers......
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