Corzette Posted May 17, 2004 Share Posted May 17, 2004 ZFAN, my current setup yields 7.74 DCR with a .045 quench. Thats with 5cc flat tops. When I go to the 383 it yields 8.38 with the 5cc flat tops and 8.14 with 7cc. Do you know the cc size of those probes? Just curious.... My deck hieght is .005 since I had it decked. Terry Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted May 17, 2004 Share Posted May 17, 2004 Terry, The Probe forged 4 valve relief flat tops are 4cc total. What size cc are your AFR 190's? 68cc? If you have 68's then your compression will be between 10.20 and 10.44 depending on deck heigth and gasket thickness/quench! My 383 has 4cc Probe flat tops and zero deck with 65cc chambers and 41k gaskets. This gives me 11.18 to 1 sucks to be me. Actually I have run 93 super and 38 degrees timing in cool weather with no problem but retarded back to 32 degrees with warmer weather to come. When I race I give her a sip of 114. 2 gallons to 4 of 93 gas. Mike Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted May 17, 2004 Share Posted May 17, 2004 Terry, Are you only wanting to know the size of the valve reliefs-or are you wanting confirmation on your DCR calculations? Kevin, (Yea,Still an Inliner) Quote Link to comment Share on other sites More sharing options...
Corzette Posted May 18, 2004 Author Share Posted May 18, 2004 Kevin, the DCR calculations but I think it will be around 8.3 or so according the numbers I input 3.75 Stroke 5.7 ROD 4.040 BORE 4.060 GASKET BORE .040 GASKET THICKNESS 4CC Piston .015 DECK HEIGHT 282/288 CAM 110 Lobe Sep 106 Center Line Chambers 68CC Terry Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted May 19, 2004 Share Posted May 19, 2004 Kevin' date=' the DCR calculations but I think it will be around 8.3 or so according the numbers I input 3.75 Stroke 5.7 ROD 4.040 BORE 4.060 GASKET BORE .040 GASKET THICKNESS 4CC Piston .015 DECK HEIGHT 282/288 CAM 110 Lobe Sep 106 Center Line Chambers 68CC Terry[/quote'] Terry, With a 4.040" Bore x Stroke of 3.75" = 385.57 cu. in. 385.57 / 8 = 48.20 cu in x 16.387 = 789.79cc Cylinder Vol in cc's Your cam indicates Valve Events (my calculations) are: Intake: 35*/67* Exhaust: 78*/30* This gives you 65* Overlap This cam when combined with your engine's..., Con Rods = 5.703 Stroke = 3.750 Piston Compression Height = 1.432 (NOTE: Your Piston Compression Height is assumed based on your Block having a 9.025" Block Deck Height & using your .015" Deck Clearance) .., gives a Crank Angle Chart that indicates your IVC of 35* has consumed .767" of your stroke. This leaves your remaining stroke at: 3.75 x .767 = 2.876" This would give you a cylinder displacement of: 4.040 x 2.876 x .7854 = 36.867 converted to cc's would be: 36.87 x 16.387 = 604.15cc Cylinder Displacement Now add up your Total Chamber Volume: Gasket Volume = 8.49cc Deck Clearance = 3.15cc Ring Land Volume = 1.5 (Assumed) Piston Valve Relief = 4cc Combustion Chamber = 68cc Total Chamber Volume = 8.49 + 3.15 + 1.5 + 4 + 68 = 85.14cc DCR = (604.15 + 85.14) / 85.14 = 8.10:1 SCR = (789.79 + 85.14) / 85.14 = 10.28:1 With this DCR to SCR relationship with 65* Cam Overlap, Aluminum Heads, Aluminum Intake-your engine should yield an excellant H/O Street Engine...just be sure you use 93 Octane for those hot summers. With your 190cc port AFR's your airflow velocity should be high enough at low rpms that you probably won't have to worry about steeper gearing. Your AFR 190's with that engine combo should yield a peak HP, at the flywheel, in the 490-535 hp range: all depending on your engine's VE%. Are you just putting together your paper engine at this point-or is this engine already a done deal? Kevin, (Yea,Still an Inliner) Quote Link to comment Share on other sites More sharing options...
Corzette Posted May 19, 2004 Author Share Posted May 19, 2004 Kevin, thanks for the info! Well I already have the engine together minus the 400 crank and assembly. I have the 350 crank in there now with full Hydraulic roller retro fit. I am adding the balanced 383 stroker kit in a couple of months using my AFR 190s, Victor Jr. Single Plane, 1 5/8 block huggers and Proform 750 DP, with the XR282HR cam. Thanks again...Im excited about the build and looks like it will yield great DCR and SCR... 11s are definately coming soon to a raceway near me... I hate those damn Camaro SS cars. They talk so much trash. Theres one that runs a 11.7 here but I have something in store for those guys.... Terry Quote Link to comment Share on other sites More sharing options...
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