biggest cam for 6-7lbs boost?
08-03-2004, 01:24 PM
#1
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biggest cam for 6-7lbs boost? just wondering what the rule is on big cams and FI. i plan to eventually have like 6-7psi and a nice cam. i know the lsa plays a factor in it, whats the disadvantages to running bigger cams with the lower lsa's?? just cant run as much boost? or it leaks boost?
08-03-2004, 02:36 PM
#2
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I like 114 LSA's.
No overlap with a Comp 218/224.
Not sure high high u can go without overlap.
222/228 114 should be ok if I had to do again, but am very happy overall.
Would confirm with Comp zero overlap.
I don't like any for FI.
No overlap with a Comp 218/224.
Not sure high high u can go without overlap.
222/228 114 should be ok if I had to do again, but am very happy overall.
Would confirm with Comp zero overlap.
I don't like any for FI.
08-03-2004, 02:42 PM
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so if i added a 6psi kit to my 224 112lsa cam i would loose boost? just wondering if i would need a new cam if i got a supercharger and also if you could go bigger like a 230 something with a 114lsa?
08-03-2004, 03:19 PM
#5
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Lower LSA has more overlap.
More overlap means you blow more of your cylinder fill out the exhaust and aren't making all the power you could have.
Higher duration or lower LSA in FI won't always make more power and often will make less.
I think the 112 LSA will be too low.
I'd look at split durations in the 220-228 range on a 114.
More overlap means you blow more of your cylinder fill out the exhaust and aren't making all the power you could have.
Higher duration or lower LSA in FI won't always make more power and often will make less.
I think the 112 LSA will be too low.
I'd look at split durations in the 220-228 range on a 114.
08-03-2004, 04:05 PM
#6
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FI Cam Rule of Thumb
---------------------
1) Duration makes power. A 224/224/112 will make more power than a car with a stock LS1 in it.
2) Higher LSA = less overlap = blowing out more cylinder fill as noted above = not as efficient but we tend to split hairs here. Can't go wrong with an FI cam with a 114 LSA.
3) Get good valvesprings.
---------------------
1) Duration makes power. A 224/224/112 will make more power than a car with a stock LS1 in it.
2) Higher LSA = less overlap = blowing out more cylinder fill as noted above = not as efficient but we tend to split hairs here. Can't go wrong with an FI cam with a 114 LSA.
3) Get good valvesprings.
08-03-2004, 05:11 PM
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Originally Posted by Pro Stock John
FI Cam Rule of Thumb
---------------------
1) Duration makes power. A 224/224/112 will make more power than a car with a stock LS1 in it.
2) Higher LSA = less overlap = blowing out more cylinder fill as noted above = not as efficient but we tend to split hairs here. Can't go wrong with an FI cam with a 114 LSA.
3) Get good valvesprings.
---------------------
1) Duration makes power. A 224/224/112 will make more power than a car with a stock LS1 in it.
2) Higher LSA = less overlap = blowing out more cylinder fill as noted above = not as efficient but we tend to split hairs here. Can't go wrong with an FI cam with a 114 LSA.
3) Get good valvesprings.
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08-03-2004, 11:58 PM
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You can have a higher lsa cam, but actually have more overlap than a lower lsa cam. You have to understand what the lobes look like. But ya in general unless a company makes a specific lobe design, a higher lsa means valve less overlap.
08-05-2004, 09:57 PM
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Originally Posted by hourang
just wondering what the rule is on big cams and FI. i plan to eventually have like 6-7psi and a nice cam. i know the lsa plays a factor in it, whats the disadvantages to running bigger cams with the lower lsa's?? just cant run as much boost? or it leaks boost?
I have a new LPE GT2 cam for sale. I was going to use but ended up changing projects considerably. 350. Brand new in box
email if interested please
steve@tarquine.net
08-05-2004, 10:11 PM
#11
Cams can be a touchy subject on FI cars.The bigger the Cam the higher the peek is in the rpm band.
A 216/220 is mild and give good power across the rev range.I've done a 230/234 in a FI 346 and got some grear power on a 346 with a peak at 6500rpm with 8lbs but it is lopey and not recommended for a stock block.
Either way you will want to stay with a 114 or 115 duration so it won't bleed off too much boost.
A 216/220 is mild and give good power across the rev range.I've done a 230/234 in a FI 346 and got some grear power on a 346 with a peak at 6500rpm with 8lbs but it is lopey and not recommended for a stock block.
Either way you will want to stay with a 114 or 115 duration so it won't bleed off too much boost.
