1966 ford 427 le mans race engine simulation dyno numbers

[patrickt]

Originally Posted by dcdoug

My lobe separation is definitely 106. Here's the cam card (if that's at all helpful - which it probably isn't).

Oh, I believe you. Larry at HM though swears that there were 112 degree LSA "B" cams coming out of Ford -- and he's been grinding cams there since WWII so I'm not about to contradict him. But there are definitely Ford B cams that have 106 degree LSA -- there's no doubt about that. HM did make cams for Ford as well, so it might as simple as "HM ground B cams were at at 106 and when Ford ground B cams they were at 112 and some of the Ford stamped cams were really from HM." I will add that I have never heard of an HM B cam having a 112 LSA. Never.

[dcdoug]

Originally Posted by patrickt

Oh, I believe you. Larry at HM though swears that there were 112 degree LSA "B" cams coming out of Ford -- and he's been grinding cams there since WWII so I'm not about to contradict him.

Interesting, I wonder if he ground my cam? My engine builder (who is in his 60s), said he had a friend at HM who is "even older than he is" grind my cam. Sounds like the same guy.

[patrickt]

Originally Posted by dcdoug

Interesting, I wonder if he ground my cam? My engine builder (who is in his 60s), said he had a friend at HM who is "even older than he is" grind my cam. Sounds like the same guy.

Probably. I think Larry is in his late 70's.

[vector1]

looking at the cam that was used in the program and what you guys are discussing, it sounds as if the cam used in the program is not correct.

if someone wants to post the cam specs you guys are discussing i'll put them in and see what happens, but it will not probably change the numbers much, just the rpm at where they happen.

optimizing the current setup, centerlines at 104/100 for a lsa of 102, dur. 248/242, gross valve lift .706/.670. that is a pretty agressive solid lifter and don't know if it could be done, looks like roller territory.

549 tq @ 5000/566 hp @ 6000,

aggressive solid roller--248/248 .722/.722 lsa 102

556 tq @ 5000/574 hp @ 6000

with this roller cam and typical street single plane intake

566 tq @ 5000/603 hp @ 6000

the two above examples are with 10" of idle vacuum, all examples are with production water pump only, normal windage, and production design pistons and bearings.

[patrickt]

My "K" cam, and Doug's "B" cam are very similar. His cam is essentially the "big brother" to my cam. Here are the specs:

K cam
intake/exhaust duration at .050: 245/245
intake/exhaust duration seat to seat: 324/324
Lobe Separation Angle: 114
Maximum Lift at the Valve: .525 less lash of .025 for an effective .500


B cam
intake/exhaust duration at .050: 245/245
intake/exhaust duration seat to seat: 324/324
Lobe Separation Angle: 106
Maximum Lift at the Valve: .525 less lash of .025 for an effective .500