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| .050 specs for stock 68 and later cam and DCR calculations. https://www.slantsix.org/forum/viewtopic.php?t=57873 |
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| Author: | drgonzo [ Fri Jun 12, 2015 12:59 pm ] |
| Post subject: | .050 specs for stock 68 and later cam and DCR calculations. |
I was trying to figure how much compression I could run with a stock cam but don't have .050 lift data. What i have is: Intake opens 10 btdc Intake closes 50 abdc Exhaust opens 50 bbdc Exhaust closes 6 atdc This corresponds with advertised numbers of 240 intake and 236 exhaust duration at 050 is 186 and 186 That data came from a pdf chart I found on here at some point. So should i just use that intake closing point of 50 abdc or guestimate the closing point at 050 lift and add 15 degree? I doubt it will make much difference. I was going to shoot for a DCR of around 8:1 Sorry if I am over thinking this. I kind of enjoy it though. |
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| Author: | SlantSixDan [ Fri Jun 12, 2015 6:19 pm ] |
| Post subject: | |
There is no "68-up stock cam". There's the '60-'65 cam, the '65-'70 cam, and the '71-'80 cam (also used for marine and for '67-up export w/2bbl), plus '81-up hydraulic cams. |
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| Author: | drgonzo [ Fri Jun 12, 2015 7:11 pm ] |
| Post subject: | |
OK, which one do I have? FW225R 2995 118 2896830-2 What are the specs? |
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| Author: | SlantSixDan [ Fri Jun 12, 2015 8:02 pm ] |
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F: 1970 model year W: Windsor engine plant 225: Engine displacement R: Passenger car engine 2995: Built on 9 October 1969 118: Serial number of 225 engines built at that plant on that day 2896830-2 : Engine block casting number So if your engine has its original camshaft, it's the '65-'70 design, with nominal specs of 241° intake duration, 236° exhaust duration, 16° overlap, and 0.395" lift on one or both lobes. I don't have the lift specs in front of me, nor do I have the at-0.050" specs. Also, these specs are for a new cam. A worn one obviously not. |
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| Author: | Doctor Dodge [ Sat Jun 13, 2015 9:24 am ] |
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Mock-up the #1 cylinder and measure your cam to chack the "phasing" and to find your actual Intake Closing point. (IC at lash, set at .010) My gut tells me that you may find it to be a little less then 50 abdc. DD |
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| Author: | drgonzo [ Sat Jun 13, 2015 2:05 pm ] |
| Post subject: | |
Thanks Dan and Doc. |
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| Author: | 3spd6 [ Sat Jun 13, 2015 8:10 pm ] |
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Dan and Doc you guys rock! The knowledge and experience you guys share on this forum beyond description. I cruise this forum looking for whatever info Karma will send me and you guys are usually involved. This thread was a classic example! thx |
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