Hi Folks,
Finalizing the camshaft for my motor and just got off the phone with Jerry from Schneider Cams. Below are the specs for my build. Am I in the "safe zone" for compression ratios? Based on the tech articles and other calculators I seem to be, but wanted another set of eyes on it.
Engine Build Specs:
Aluminum Head/Intake
Either 350cfm 2100 or 480cfm 4100 (undecided, will see which runs better I have both)
Piston Dish = 0
Deck Clearance = 0
Combustion Chamber Size = 53cc
Stroke = 3.126"
Rod Length = 4.715"
Gasket Thickness = .044" (Victor)
Gasket Bore = 3.81"
Cylinder Bore = EITHER 3.70" or 3.71" (awaiting feedback form machinist)
Camshaft Specs (Hydraulic):
Intake Duration = 262 (at .050" = 208)
Exhaust Duration = 270 (at .050" = 214)
Intake Valve Lift (1.65 rockers) = .462"
Exhaust Valve Lift (1.65 rockers) = .480"
Lobe Separation = 110
Intake Valve Close ABDC = 59
Static compression is coming out to be right at 10:1. I run exclusively premium 91-93 octane. I have 91 ethanol free around me, I plan to use that.
Dynamic compression I'm finding multiple calculators that are giving me different results. One says I'm right at 8.37:1 which is in range per the tech articles on static vs dynamic. Others I've been in the 7s. Does anyone have a tool to calculate dynamic CR based on my build?
Cheers,
Matthew
Finalizing the camshaft for my motor and just got off the phone with Jerry from Schneider Cams. Below are the specs for my build. Am I in the "safe zone" for compression ratios? Based on the tech articles and other calculators I seem to be, but wanted another set of eyes on it.
Engine Build Specs:
Aluminum Head/Intake
Either 350cfm 2100 or 480cfm 4100 (undecided, will see which runs better I have both)
Piston Dish = 0
Deck Clearance = 0
Combustion Chamber Size = 53cc
Stroke = 3.126"
Rod Length = 4.715"
Gasket Thickness = .044" (Victor)
Gasket Bore = 3.81"
Cylinder Bore = EITHER 3.70" or 3.71" (awaiting feedback form machinist)
Camshaft Specs (Hydraulic):
Intake Duration = 262 (at .050" = 208)
Exhaust Duration = 270 (at .050" = 214)
Intake Valve Lift (1.65 rockers) = .462"
Exhaust Valve Lift (1.65 rockers) = .480"
Lobe Separation = 110
Intake Valve Close ABDC = 59
Static compression is coming out to be right at 10:1. I run exclusively premium 91-93 octane. I have 91 ethanol free around me, I plan to use that.
Dynamic compression I'm finding multiple calculators that are giving me different results. One says I'm right at 8.37:1 which is in range per the tech articles on static vs dynamic. Others I've been in the 7s. Does anyone have a tool to calculate dynamic CR based on my build?
Cheers,
Matthew