some cam advice
Nov 1, 2004 | 03:56 PM
#1
Thread Starter
Joined: Apr 2004
Posts: 16,820
Likes: 2
From: In a van DOWN BY THE RIVER
some cam advice
i have a 03 4.8.what would be a good healthy/blower cam choice for it.i have searched for it but most of the people are sprayin with them.thanks for the info 
Nov 1, 2004 | 04:06 PM
#2
Seeing as it is FORCED induction.
You'd want a longer exhaust duration, w/ minimal overlap. Pick the cam suited for your power band, and no higher. Minimal overlap. I really wouldn't go with a wide lobe seperation angle. I'd use a 112 or something of this nature.
Those are just my thoughts. Thoughts I would have, before approaching a custom camshaft builder.
There's so many factors to take into hand I don't think you'll make a good choice, unless you go custom. Its a big decision. I'd personally go to Ed Curtis, or someone who's good with customs and has experience in Blower applications.
---
btw, do you have the blower yet. might wanna work on that if not
i didn't even think about that, and where it builds boost
If you don't go custom, make sure not to get hung up on the exhaust bias idea.
You'd want a longer exhaust duration, w/ minimal overlap. Pick the cam suited for your power band, and no higher. Minimal overlap. I really wouldn't go with a wide lobe seperation angle. I'd use a 112 or something of this nature.
Those are just my thoughts. Thoughts I would have, before approaching a custom camshaft builder.
There's so many factors to take into hand I don't think you'll make a good choice, unless you go custom. Its a big decision. I'd personally go to Ed Curtis, or someone who's good with customs and has experience in Blower applications.
---
btw, do you have the blower yet. might wanna work on that if not
i didn't even think about that, and where it builds boost
If you don't go custom, make sure not to get hung up on the exhaust bias idea.
Nov 1, 2004 | 04:45 PM
#3
TECH Junkie
Joined: Mar 2003
Posts: 3,271
Likes: 0
From: Katy, TX
Originally Posted by SportSide 5.3
Seeing as it is FORCED induction.
You'd want a longer exhaust duration, w/ minimal overlap. Pick the cam suited for your power band, and no higher. Minimal overlap. I really wouldn't go with a wide lobe seperation angle. I'd use a 112 or something of this nature.
Those are just my thoughts. Thoughts I would have, before approaching a custom camshaft builder.
There's so many factors to take into hand I don't think you'll make a good choice, unless you go custom. Its a big decision. I'd personally go to Ed Curtis, or someone who's good with customs and has experience in Blower applications.
---
btw, do you have the blower yet. might wanna work on that if not
i didn't even think about that, and where it builds boost
If you don't go custom, make sure not to get hung up on the exhaust bias idea.
You'd want a longer exhaust duration, w/ minimal overlap. Pick the cam suited for your power band, and no higher. Minimal overlap. I really wouldn't go with a wide lobe seperation angle. I'd use a 112 or something of this nature.
Those are just my thoughts. Thoughts I would have, before approaching a custom camshaft builder.
There's so many factors to take into hand I don't think you'll make a good choice, unless you go custom. Its a big decision. I'd personally go to Ed Curtis, or someone who's good with customs and has experience in Blower applications.
---
btw, do you have the blower yet. might wanna work on that if not
i didn't even think about that, and where it builds boost
If you don't go custom, make sure not to get hung up on the exhaust bias idea.
Nov 1, 2004 | 04:55 PM
#5
yep you want a lobe sep. to be no less than 114 for forced induction. i think the cam snakeater is referring to is the gt2 cam. i think that is one of the cams that radix will suggest as well.
Nov 1, 2004 | 05:16 PM
#6
Originally Posted by Snake Eater
They have just a little knoledge about forced induction. LOL
Originally Posted by SportSide 5.3
Minimal overlap. I really wouldn't go with a wide lobe seperation angle. I'd use a 112 or something of this nature.
Nov 1, 2004 | 06:13 PM
#7
Close but wrong. With boost you want good lift(.550 or better), good duration(218 or better on both intake and exhaust), split duration(at least 4*. For example, 220/224), and good overlap(114LSA-119LSA)
where am i wrong? i don't remember mentioning specs to lift/duration,or the amount of overlap.
and good overlap(114LSA-119LSA
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Nov 1, 2004 | 06:34 PM
#9
Originally Posted by Snake Eater
Close but wrong. With boost you want good lift(.550 or better), good duration(218 or better on both intake and exhaust), split duration(at least 4*. For example, 220/224), and good overlap(114LSA-119LSA)
Snake Eater,
Where am I wrong?
I said, MY THOUGHTS were,
-exhaust biased camshaft
-never mentioned lift
-never mentioned *'s of duration, nor *'s overlap
-A 112lsa, or of that nature. Give or take.
Pull in more area under the curve, with a tighter lobe seperation angle, BUT maintain minimal overlap. Yep, its possible.
Retard the camshaft a few degrees, keeps valve events same, but held open longer. Thats an option.and what the **** is good overlap?
Nov 1, 2004 | 08:40 PM
#10
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.