108LSA cam running on stock tune
07-09-2006, 06:25 PM
#11
Originally Posted by Yelo
Why run such a narrow LSA on a small cam ?? It seems to me that by the time you've reached an RPM that takes advantage of the narrower LSA you've run out of cam....
07-09-2006, 07:48 PM
#13
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I'm running it at a 108 ICL or 0 degrees advance. Most cams come with 4 degrees of advance, as ground. So with a 112LSA, you are now at a 108ICL. What I did was tighten the LSA at the same time. Overlap increases this way but, I still stuck with a 108 ICL. Overlap is 48* @ .006'' which matches a TR220-112. This was what I was shooting for. Just enough lope for me as I got to hear a TR220-112 quite often over the past 6 months and I knew I didn't want much more lope. Picking out a cam based off of lope probably isn't the best way to go about things but, I still want things street-able.
Tightening the LSA will move the powerband up. Yes, too tight of a LSA and not enough exhaust duration (you'll notice I'm running a reverse split) and you can quickly run out of RPM. With the truck intake manifold, I don't see this happening however. But, I'm going to eventually take it to the dyno and find out. I've seen a few 212/218 .530 cams make it well past 5500-RPM. And although a 212/218 cam may appear to be the same size as mine... They don't have nothing on me when you look at total lobe area. Take a look at the lift on this cam. My intake lobe should come out close to the same size as TRs 220 lobe (just a guess).
Tightening the LSA will move the powerband up. Yes, too tight of a LSA and not enough exhaust duration (you'll notice I'm running a reverse split) and you can quickly run out of RPM. With the truck intake manifold, I don't see this happening however. But, I'm going to eventually take it to the dyno and find out. I've seen a few 212/218 .530 cams make it well past 5500-RPM. And although a 212/218 cam may appear to be the same size as mine... They don't have nothing on me when you look at total lobe area. Take a look at the lift on this cam. My intake lobe should come out close to the same size as TRs 220 lobe (just a guess).
Last edited by Sport Side; 07-09-2006 at 07:54 PM.
07-10-2006, 01:32 PM
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Originally Posted by bluecajun5.3
that's a good way to put it.
i'm anxious to see what that sucker's going to do!
i'm anxious to see what that sucker's going to do!
If it's the lifters, I'm probably gonna just change them out and put a set of milled heads on. Sorta pissed off... I wanted to try the cam-only thing for a while... IDK
07-10-2006, 01:42 PM
#17
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Originally Posted by Sport Side
I'm running it at a 108 ICL or 0 degrees advance. Most cams come with 4 degrees of advance, as ground. So with a 112LSA, you are now at a 108ICL. What I did was tighten the LSA at the same time. Overlap increases this way but, I still stuck with a 108 ICL. Overlap is 48* @ .006'' which matches a TR220-112. This was what I was shooting for. Just enough lope for me as I got to hear a TR220-112 quite often over the past 6 months and I knew I didn't want much more lope. Picking out a cam based off of lope probably isn't the best way to go about things but, I still want things street-able.
Tightening the LSA will move the powerband up. Yes, too tight of a LSA and not enough exhaust duration (you'll notice I'm running a reverse split) and you can quickly run out of RPM. With the truck intake manifold, I don't see this happening however. But, I'm going to eventually take it to the dyno and find out. I've seen a few 212/218 .530 cams make it well past 5500-RPM. And although a 212/218 cam may appear to be the same size as mine... They don't have nothing on me when you look at total lobe area. Take a look at the lift on this cam. My intake lobe should come out close to the same size as TRs 220 lobe (just a guess).
Tightening the LSA will move the powerband up. Yes, too tight of a LSA and not enough exhaust duration (you'll notice I'm running a reverse split) and you can quickly run out of RPM. With the truck intake manifold, I don't see this happening however. But, I'm going to eventually take it to the dyno and find out. I've seen a few 212/218 .530 cams make it well past 5500-RPM. And although a 212/218 cam may appear to be the same size as mine... They don't have nothing on me when you look at total lobe area. Take a look at the lift on this cam. My intake lobe should come out close to the same size as TRs 220 lobe (just a guess).
07-10-2006, 05:27 PM
#18
Try going to some thicker oil for you lifter problem it helped mine out some. How long did it take for the lifters to pump up after initial start up? Did you prime the motor before starting it up? By prime I mean spinning the motor over with the key with the coil packs unplugged until you got oil pressure just in case you didnt know what I mean.
07-10-2006, 06:56 PM
#19
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I have a bad tapping with my ED C cam. Its calmed down a bit but its still there. Im buying a set of 7.425" Pushrods from another member and see if it goes away.
Kyle, ask Ed what base-circle he uses on his blanks.
Kyle, ask Ed what base-circle he uses on his blanks.
07-10-2006, 10:01 PM
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I'll chime in since I was there helping on the install. Yes, we did prime it with coil packs unplugged.
That's very odd Kyle, since there was no tapping at all Sat. night when we took it for alittle test drive. Keep me posted.
That's very odd Kyle, since there was no tapping at all Sat. night when we took it for alittle test drive. Keep me posted.