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| Author: | wjajr [ Thu Mar 22, 2018 1:34 pm ] |
| Post subject: | r |
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| Author: | wjajr [ Thu Mar 22, 2018 1:36 pm ] |
| Post subject: | Re: Calculating dynamic compression ratio double check |
New cam showed up today!!! 225 ci 1968 block, 1977 peanut head no EGR Dimensions: Bore 3.430" Stroke 4.125" Rod length 6.698" Head volume 39 to 40cc Vel Pro Head gasket dia 3.525" Head Gasket thickness .039"-0.041" Piston down in hole .180" New cam Oregon grind # 346 rocker ratio 1.5 Lobe separation 108* Lobe center line Int= 1048 Exh=112* Cam lobe lift I= .317" E=.319 Lash I=.012" E=.012" Cam timing at .050" tappet rise: Intake open=13 BTDC Close= 41 ABDC Exhaust open=46 Close=2 15* overlap at 0.050" Lift at valve intake= .476" Exhaust=.479" Static compression ratio = 9.6 One calculator gave 8.7:1 dynamic ratio Elevation= 300' Second calculator gave 8.2 Using 10:1 static dynamic =8.5 If my engine actually has static compression 9.6 and dynamic 8.16, from what I recall from other posts here, it should run on pump gas with no problem, is that right? |
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