some cam advice
Nov 1, 2004 | 08:51 PM
#11
Thread Starter
Joined: Apr 2004
Posts: 16,820
Likes: 2
From: In a van DOWN BY THE RIVER
so what would the most amount of lift be that i could run and still not be a bitch to tune.560/more.should i go with a traditional split reverse.i'm not talkin about having a custom grind just a good off the shelf cam. btw thanks for this info
Nov 2, 2004 | 05:08 AM
#14
Originally Posted by 02denali
damn. now that is good. yay throw in a 112 lsa and retard it. 
just by the right cam and stick it in and it will be right. with a 112 lsa there is overlap and it is causing a vaccumn type motion. uuuhhh doh. we are going to be forcing it in there. so we dont need that. we need the valves to be closing so as to not bleed off boost. 
just by the right cam and stick it in and it will be right. with a 112 lsa there is overlap and it is causing a vaccumn type motion. uuuhhh doh. we are going to be forcing it in there.
so we dont need that. we need the valves to be closing so as to not bleed off boost. You need to realize, it depends upon the type of blower also. Take a procharger for example. They create boost in the upper rpm range.
Throwing in a camshaft with alot of duration and a wide lsa, is going to....maximize top end power.
why, would you do that when you induction is forced at those rpms.
Small duration, small standard split. Tight lsa, to help bottom end performance. Something like that would have very little overlap.
You need to work with the rpm operating range. To much duration will throw you over this.
Take the stock camshaft. Its run on a 114 lsa. On a 112, it wouldn't have a shitload of overlap. There would be nothing wrong with retarding a camshaft. Many are ground with 1-2 degrees retarded for naturally aspirated setups.
Do you know how to calculate overlap? In the formula, more duration has an effect on overlap. You can calculate the degrees of overlap. (in., duration + ex., duration / 2 - (2 * lsa)
Give me the lingenfelter gt-2 camshaft specs @ .050 w/ the icl, if you don't mind.
we need the valves to be closing so as to not bleed off boost.
Nov 2, 2004 | 05:44 AM
#15
I get where your coming from.
Bleeding off boost can occur with excessive overlap.
The thread starter, hasn't named the type of blower, operating range, or really anything. So we're stuck on disagreements about the lsa
I'll just clear one thing up. I wasn't pointing out that a 112 is the best for boost. But given low overlap, optimizing low rpm isn't a bad thing. And I don't disagree with wider lsa's.
Check the FI section. Many are using 115lsa's. But they're camshaft has 232* of duration @ .050. fairly big for a motor of our size. again, depends on the rpm range. and so on.
thats all
, no hard feelings
Bleeding off boost can occur with excessive overlap.
The thread starter, hasn't named the type of blower, operating range, or really anything. So we're stuck on disagreements about the lsa
I'll just clear one thing up. I wasn't pointing out that a 112 is the best for boost. But given low overlap, optimizing low rpm isn't a bad thing. And I don't disagree with wider lsa's.
Check the FI section. Many are using 115lsa's. But they're camshaft has 232* of duration @ .050. fairly big for a motor of our size. again, depends on the rpm range. and so on.
thats all
, no hard feelings
Nov 2, 2004 | 07:15 AM
#17
Originally Posted by 02denali
i do realize it all. with a 112 lsa it will bleed boost. with a 114 to 115 lsa it will bleed less boost thus making more power. period.
Nov 2, 2004 | 01:00 PM
#20
with a 112 lsa it will bleed boost. with a 114 to 115 lsa it will bleed less boost thus making more power.
Would you mind explaining?