502 mag want to make 500 hp. cam problems
02-10-2009, 10:29 AM
#21
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Location: Bettendorf, Iowa
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crane called me and they said i should run the 139011 ant that is the gen 5 comparison to the 731 series gen 6. im still gonna wait to talk to rm and see what he says.
02-19-2009, 06:31 PM
#24
MarineKinetics
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Mitch,
When I received the message re: valve spring setup in your package, I was skeptical of the figures for the springs provided to you. It is unlikely a qualified engine builder familiar with HR valvetrain setup would have recommended this part. The spring number you passed along (Lunati 74014) is a discontinued item; however I do have the specs on the springs.
225 # @ 2.000”
625 # @ 1.250”
Rate 533 #/in
Your peak lift being ~ .600”, the spring force at that point is 545#. Given a rocker ratio of 1.7, the force at the lifter is 926.5#. If the part number is accurate, and these are in fact the springs you are using, I would suggest you change out the springs prior to firing the engine.
Bob
When I received the message re: valve spring setup in your package, I was skeptical of the figures for the springs provided to you. It is unlikely a qualified engine builder familiar with HR valvetrain setup would have recommended this part. The spring number you passed along (Lunati 74014) is a discontinued item; however I do have the specs on the springs.
225 # @ 2.000”
625 # @ 1.250”
Rate 533 #/in
Your peak lift being ~ .600”, the spring force at that point is 545#. Given a rocker ratio of 1.7, the force at the lifter is 926.5#. If the part number is accurate, and these are in fact the springs you are using, I would suggest you change out the springs prior to firing the engine.
Bob
02-20-2009, 08:46 AM
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bob, the machinst gave me back my old valve springs in a lunati box.... the part # i gave you was on that box. aparently he put in glm or gls (something that started with a g on them) anayways they are 145lbs installed at 2 inches. i apprecieate the help. i apprecieate everyones help. hopefully these springs will be ok.
04-14-2009, 09:59 PM
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i fired it tonight!!!!!!!!!!! despite one fireball (not in perfect time yet) it ran great! that 500hp cam sounds great! my exhaust sounds great. the carb was set up well. i need to do some more checking a little later. thanks to everyone! thank you rm builder, joby, Griff, and all else who helped me make smoething out of my 502 mag. i hear a little lifter noise but im sure they will fully pump up soon. and i might have ruined an impeller filling up the engine but all is well! i will post some pics soon and let you know how it runs.
