|
Author
|
Message
|
|
Cliff
|
|
|
Group: Forum Members
Last Active: Yesterday
Posts: 863,
Visits: 13.3K
|
Steel shim head gaskets and a cut on the cylinder heads will help.
|
|
|
|
|
Ted
|
|
|
Group: Administrators
Last Active: 29 minutes ago
Posts: 7.4K,
Visits: 205.0K
|
55blacktie (1/21/2021)
gofastmath dynamic compression calculator asks for "IVC @.050."Unless you set your valve lash to 0.050”, the intake valve will not be closed at the 0.050” value. The advertised duration intake closing number works for DCR due to the advertised numbers for solid cam shafts being generated at 0.020” lobe lift at both sides of the flanks.mikeT (1/21/2021)
Thanks Ted, My rods are the C2AE I believe there 6.324 long? would that change the dynamic ratio? While a longer rod does lower the DCR number, it’s takes a major change in length to make a difference. Here’s the same DCR calculation with the 292 rod length inserted. That previously posted rod length was the 312 length. Here is the revised DCR. Not much change.
  Lorena, Texas (South of Waco)
|
|
|
|
|
55blacktie
|
|
|
Group: Forum Members
Last Active: Yesterday
Posts: 1.2K,
Visits: 1.7K
|
Mike T, I just sent a PM. If you didn't receive it, let me know.
|
|
|
|
|
55blacktie
|
|
|
Group: Forum Members
Last Active: Yesterday
Posts: 1.2K,
Visits: 1.7K
|
gofastmath dynamic compression calculator asks for "IVC @.050."
|
|
|
|
|
mikeT
|
|
|
Group: Forum Members
Last Active: 2 Years Ago
Posts: 39,
Visits: 1.7K
|
Thanks Ted,
My rods are the C2AE I believe there 6.324 long?
would that change the dynamic ratio?
|
|
|
|
|
Ted
|
|
|
Group: Administrators
Last Active: 29 minutes ago
Posts: 7.4K,
Visits: 205.0K
|
|
|
|
|
|
mikeT
|
|
|
Group: Forum Members
Last Active: 2 Years Ago
Posts: 39,
Visits: 1.7K
|
Dont know why I didnt post the cam card already?? 
|
|
|
|
|
Ted
|
|
|
Group: Administrators
Last Active: 29 minutes ago
Posts: 7.4K,
Visits: 205.0K
|
mikeT (1/21/2021)
Thanks Ted! would you suggest advancing or retarding the cam ? The cam card says the intake closes at 45 degrees That 45° number does not mean much to me without the other numbers. If using the lobe centerline method to degree in the camshaft, then my recommendation is to install it at 105°-106° intake lobe centerline which is 4-5° advanced. This is assuming the timing chain is new. As the chain wears in, the camshaft will retard accordingly. When I run the numbers through my spread sheet, the intake valve should be closing at 58½° ABDC with 4° of advance assuming the advertised duration is figured at 0.020” lobe lift.
Lorena, Texas (South of Waco)
|
|
|
|
|
mikeT
|
|
|
Group: Forum Members
Last Active: 2 Years Ago
Posts: 39,
Visits: 1.7K
|
Thanks Ted!
would you suggest advancing or retarding the cam ? The cam card says the intake closes at 45 degrees
|
|
|
|
|
Ted
|
|
|
Group: Administrators
Last Active: 29 minutes ago
Posts: 7.4K,
Visits: 205.0K
|
I took a look at the specs on that Howards camshaft and it does look like a good candidate for your combination. I will have to disagree with the basic rpm range that’s listed for it though as it should indicate a wider rpm band. That camshaft is similar to the one I use in the 312 dyno mule which is a Crower Monarch 280-F which has a 280° advertised duration but the same 238° duration at 0.050” and ground on the same 110° lobe centers. I’ll suggest checking the valve to edge of piston bore clearance as any significant milling of the heads will bring the intake valve dangerously close to the cylinder wall at full lift. Small notches at cylinder wall edges under the intake valves will solve any clearance issues for that but be sure those notches stay above the top ring area of the cylinder. Howards camshaft 290862-10
Year:1955 - 1963
Make: Ford
Engine: 292-312
Camshaft Type: Mechanical Flat Tappet
Basic RPM Range: 2800 to 5400
Valve Lift Intake: .515
Valve Lift Exhaust: .515
Duration Intake: 265
Duration Exhaust: 265
Duration at 050 Intake: 238
Duration at 050 Exhaust: 238
Lobe Separation: 110
Intake Centerline: 106
Firing Order: 1-5-4-8-6-3-7-2
Quantity: 1 Each
Country of Origin: United States
Lorena, Texas (South of Waco)
|
|
|
|