Big lopey cams..question?
08-17-2009, 01:04 AM
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Big lopey cams..question? I have a question for all of the cammed guys out there.
What actually causes a "rough idle" so rough it sounds like the car is about to shut off?
Example.
My cam is going to be a: 238/244 .658/.666 112 LSA.
I realize the lift is a little extreme, but thats just what happened, and im happy and fine with that. but the duration isnt all that extreme neither is the LSA...im guessing it will sound something close to an MS3 or F14 cam....will the ultra high lift have a big effect on the lopeness other than the duration/lsa?? Thanks for all of the info.
What actually causes a "rough idle" so rough it sounds like the car is about to shut off?
Example.
My cam is going to be a: 238/244 .658/.666 112 LSA.
I realize the lift is a little extreme, but thats just what happened, and im happy and fine with that. but the duration isnt all that extreme neither is the LSA...im guessing it will sound something close to an MS3 or F14 cam....will the ultra high lift have a big effect on the lopeness other than the duration/lsa?? Thanks for all of the info.
08-17-2009, 03:06 AM
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Hey Blackhawk, somewhat kidding. 17 degrees overlap is mighty healthy. I know my 10 degrees is what I would consider 'moderately aggressive'.
Real quick on your question. There is a good lope sound from overlap, but a rough idle where it sounds like it is about to die on you, is not what you want. If your tune is spot on and holds idle, it should sound more like a Nascar stock car. Very noticeable lope..sort of a spitting sound.
Let us know how it goes. How high are you going to be revving that engine? Should be fun on the track.
Good luck.
..WeathermanShawn..
08-17-2009, 07:34 AM
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Man, I must be getting old. A 238/244 cam is not that 'extreme'.
Hey Blackhawk, somewhat kidding. 17 degrees overlap is mighty healthy. I know my 10 degrees is what I would consider 'moderately aggressive'.
Real quick on your question. There is a good lope sound from overlap, but a rough idle where it sounds like it is about to die on you, is not what you want. If your tune is spot on and holds idle, it should sound more like a Nascar stock car. Very noticeable lope..sort of a spitting sound.
Let us know how it goes. How high are you going to be revving that engine? Should be fun on the track.
Good luck.
..WeathermanShawn..
Hey Blackhawk, somewhat kidding. 17 degrees overlap is mighty healthy. I know my 10 degrees is what I would consider 'moderately aggressive'.
Real quick on your question. There is a good lope sound from overlap, but a rough idle where it sounds like it is about to die on you, is not what you want. If your tune is spot on and holds idle, it should sound more like a Nascar stock car. Very noticeable lope..sort of a spitting sound.
Let us know how it goes. How high are you going to be revving that engine? Should be fun on the track.
Good luck.
..WeathermanShawn..
Im actually going to Bristol, TN to watch the race this Saturday so I will listen out closely to the lope lol
.Im going to turn it as much as my trans will let me..7000 hopefully. But im thinking ill have to shift around 6850
. The engine shop ordered my cam today..ill get pics up of the rest of my stuff as soon as it comes in. 