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| Dynamic compression ratio Q with new cam https://www.slantsix.org/forum/viewtopic.php?t=62120 |
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| Author: | wjajr [ Thu Mar 22, 2018 5:04 pm ] |
| Post subject: | Dynamic compression ratio Q with new cam |
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? _________________ 67' Dart GT Convertible; the old Chrysler Corp. 82' LeBaron Convertible; the new Chrysler Corp 07' 300 C AWD; Now by Fiat, the old new Chrysler LLC |
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| Author: | sandy in BC [ Thu Mar 22, 2018 6:21 pm ] |
| Post subject: | Re: Dynamic compression ratio Q with new cam |
You should be fine as long as your gears/convertor science is correct. My Valaint with similar CR #s ran fine on 87...( 5 speed/ 3.55/ 24" tires) |
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| Author: | DusterIdiot [ Thu Mar 22, 2018 7:33 pm ] |
| Post subject: | Re: Dynamic compression ratio Q with new cam |
I ran it on my favorite DCR calculator... you are fine... it will be closer to 8 DCR... it should run on pump gas just fine (some recurve fine tuning will allow it to run on 87 vs. 89). Looking like a nice torque band from 2k-4500 rpm from 229 peaking at 241 ft/lbs at 4K, around 196-216 hp peak at 5000 rpm... will be very positive at street rpm vs. a stocker with a super six and very kind rear gearing. |
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| Author: | wjajr [ Fri Mar 23, 2018 10:50 am ] |
| Post subject: | Re: Dynamic compression ratio Q with new cam |
3.55 rear gear, 2600rpm stall converter, 24.5" tires Runs 60 mph @ 3000 rpm. |
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| Author: | sandy in BC [ Fri Mar 23, 2018 1:50 pm ] |
| Post subject: | Re: Dynamic compression ratio Q with new cam |
Nice to see all those numbers lining up. |
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