Best Cam LSA for MPG
11-24-2011, 12:23 AM
#11
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Well my tunnnnnning obviously sucks cause on paper gallons/miles is 10.5 to 11.5..... So I need some better tunnnning I guess!! Id be happy with 13-14 mpg geezzzzzzzz.
11-24-2011, 01:18 AM
#12
Exactly. Cam Motion doctors EVERY camshaft it ships, so when you get the cam card that is EXACTLY what the cam is. A nice little perk for the person building the engine. Can't say the same for Comp and their generic specs/cam card print outs. Most of their cams are 2-5 degrees off of what the card says.
I'm seriously wondering when it became acceptable to be rude on this forum, was never like this several years ago that I can remember.
11-24-2011, 08:00 AM
#13
To actually answer your question, its overlap that you should reduce in order to maximize fuel economy.
In this case, since both cams have the same intake and exhaust durations, you can say that a "larger" LSA will have less overlap and will theoretically get better mileage.
In this case, since both cams have the same intake and exhaust durations, you can say that a "larger" LSA will have less overlap and will theoretically get better mileage.
11-24-2011, 10:23 AM
#14
I can sure see that on bigger cams. The cams we're talking about won't have any overlap even on a 111 lsa. On a fairly mild cam, wouldn't the cylinder pressure be higher, at say 2000 rpm, with a narrower LSA cam? Couldn't the higher cylinder pressure lead to a more effecient motor?
11-24-2011, 11:27 AM
#15
I am not being rude i just get tired of people posting negative or untruthful comments that they can not prove. Your post is a pefect example, you read that comp cams does not build to spec, now you post it as fact since someone else posted it.
11-24-2011, 05:04 PM
#16
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I can sure see that on bigger cams. The cams we're talking about won't have any overlap even on a 111 lsa. On a fairly mild cam, wouldn't the cylinder pressure be higher, at say 2000 rpm, with a narrower LSA cam? Couldn't the higher cylinder pressure lead to a more effecient motor?
And to get even more specific, it is actually dependent on the area under the overlap curve. So a more aggressive lobe profile with faster ramp rates will behave worse than a "softer" lobe. We are just trying to minimize the volume of air (and fuel) that can bypass the combustion process.
11-24-2011, 05:18 PM
#17
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Hmmm i have no idea who that is so your post means nothing.
I am not being rude i just get tired of people posting negative or untruthful comments that they can not prove. Your post is a pefect example, you read that comp cams does not build to spec, now you post it as fact since someone else posted it.
I am not being rude i just get tired of people posting negative or untruthful comments that they can not prove. Your post is a pefect example, you read that comp cams does not build to spec, now you post it as fact since someone else posted it.
the person he quoted is a mod over on tech....
11-28-2011, 01:23 PM
#18
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Cam Motion was started by one of the Grind Master's from Crane 20+ years ago, because of the lack of grind consistency and the fact that nobody seemed to care from the major cam company's. Lonnie Langely was a Master Engine builder for Robert Yates and Holman Moody for years. He would hand read all the cams that he would get from COMP or Crane and 70% of them would be wrong. CAM MOTION and BULLET are the only cam companies that He would use because of this fact. I use HOWARDS cams (MADE IN THE USA), but have used Bullet and Cam Motion with no complaints.
11-28-2011, 08:03 PM
#19
As far as NA cams iv played with alot of different cams and every time the tighter lsa brings in torque quicker at the low rpm, like said.. more low end torque means more cylender pressure witch means you will make more power for the fuel you use so you get better mpg. Iv never been a big fan huge cams so they may be different idk.
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