509 cam specs
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Garys1969RR
Well-Known Member
The .509 cam has a valve lift of .509" at valve. Advertised duration is 292 degrees. 242 deg at .050".
Meep-Meep
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And I'm 99.99% sure it's on a 108 LSA. It's possible there is another .509" cam on a 112 LSA but I've never seen it. They must have come out with that one while I was sleeping. If you have low manifold vacuum and it idles like a pro stock car then you have the 108.
I'm still learning about the finer details of camshafts. In this case Center Line = LSA? How does one widen the LSA while keeping the duration the same? I thought one affected the other.
douggreif
Well-Known Member
Yes it helps!! Looking at the chart it looks like there are two 509 cams. I have 9" of vac at 900rpm. I am guessing that I have the one with 108 LSA. Short of pulling cam how can I know for sure, or can I? Thanks for the info
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Any idea when the revised 114 LSA came about?
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Any idea when the revised 114 LSA came about?
lewtot184
Well-Known Member
duration can remain the same. lobes are just ground further apart.
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114lsa came out a few years back, maybe more. don't know if it's still available. i don't like long duration hydraulic cams. most people don't know how to tune for them. anything past the 284-.484 i'd move into a solid.
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The 509 cam with the 114 LSA will idle smoother and deliver more idle vacuum. If you're at 9" with the right tune, you can be pretty sure that you have the 108 version.
Both are decent cams for spirited street fun but not great at part throttle driving. The low vacuum is a pisser for power brakes and the rough idle can be annoying. I ran a 509 in a 440/493 for years and grew tired of the rough idle. I went with a Lunati but have since bought a MP 284/528 solid I plan to install over the winter. I want power without the rough idle and low vacuum.
Both are decent cams for spirited street fun but not great at part throttle driving. The low vacuum is a pisser for power brakes and the rough idle can be annoying. I ran a 509 in a 440/493 for years and grew tired of the rough idle. I went with a Lunati but have since bought a MP 284/528 solid I plan to install over the winter. I want power without the rough idle and low vacuum.
Garys1969RR
Well-Known Member
I am assuming that the 114 lobe separation angle refers to the distance, in degrees, between the peak lift position of each cam lobe. So with a 114 degree LSA you are going to have less over lap than with a 108 LSA. Less overlap meaning both valves will be open at the same time for a shorter period. This is when the ex valve is still closing and the int valve is opening. Piston is near TDC. Therefore there would less mixing of the ex gas with the fresh incoming charge. The degrees of duration would be the same, but opening/closing events would be 3 degrees earlier on the ex closing, and 3 degrees later on the intake opening. That would get the 6 degrees less overlap. 108 to 114 is 6 degrees.
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I think I am looking at this correctly, if not please let me know. I am running a 509 in my 451, and it idles rough, but soon as the RPM hits 1800, it pulls smoothly on part throttle. An initial ignition advance of 20 degrees really helps this cam pull at the low end.
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I think I am looking at this correctly, if not please let me know. I am running a 509 in my 451, and it idles rough, but soon as the RPM hits 1800, it pulls smoothly on part throttle. An initial ignition advance of 20 degrees really helps this cam pull at the low end.
lewtot184
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the difference is 6 degrees for opening and closing on intake and exhaust. overlap is reduced 12 degrees.
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Resurrecting this thread. I knew I had a purple stripe cam, but I couldn't determine which one and didn't have access to a dial indicator to check the lift. My 71 440 has a rough idle (which sounds AWESOME, especially when I open the exhaust cutouts) and pulls strong to 6,100 rpms. I am 54 years old and I remember the "284" and "292" old school Mopar cams, but didn't know the lift. Anyway, someone heard my 70 Roadrunner idling at Mopars at the Marina and asked me if I had a 509. I said no, it's a 440 and then he said he was referring to the cam. Then I realized that it is very likely that the cam is a 292°/.509. I don't have power brakes and have "armstrong" steering, and around 10" IIRC vacuum at 9XX rpm idle. 3.54 Dana and a 4 speed. I love the performance and SOUND of this cam!! 4.10 rear gear coming in the future after traction aids (CalTracks) and I complete the purchase of a trailer and/or get an overdrive 5 speed.
condor74
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I have a mopar .509 cam in my 383. I have the one on the 114 degree centerline. I didn't pick it out but during a brief time where I sold the car , the owner at the time put it in.
The motor is a stock standard bore 2bbl 383 block with 906 heads and a Holly street dominator manifold and edelbrock carb. It does have headers but I don't remember the size.
It idles with a very nice heavy lope and pulls hard past 6000 rpm. The rest of the car is rough but I get lots of complements on the sound of it.
The motor is a stock standard bore 2bbl 383 block with 906 heads and a Holly street dominator manifold and edelbrock carb. It does have headers but I don't remember the size.
It idles with a very nice heavy lope and pulls hard past 6000 rpm. The rest of the car is rough but I get lots of complements on the sound of it.
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