112 Lsa
TECH Resident
Joined: Dec 2004
Posts: 845
Likes: 0
From: K-W, Ontario
Yes, that's pretty much the concept.
IE:
240/240 Duration & 600/610 Lift at 112 Lobe Seperation.
240/240 Duration & 600/610 Lift at 114 Lobe Seperation.
The 112 LSA would have more overlap if the valve timing was the same.
IE:
240/240 Duration & 600/610 Lift at 112 Lobe Seperation.
240/240 Duration & 600/610 Lift at 114 Lobe Seperation.
The 112 LSA would have more overlap if the valve timing was the same.
11 Second Club
Joined: Feb 2003
Posts: 5,524
Likes: 1
From: The South
Originally Posted by waterbug1999
So, given the numbers are the same.. Typically the 112 will "lope" more?
2??/2?? Duration & 600/610 Lift at 112 Lobe Seperation.
2??/2?? Duration & 600/610 Lift at 114 Lobe Seperation.
And if this is the G5X3.. Then how bigger could the G5X4 be?
2??/2?? Duration & 600/610 Lift at 112 Lobe Seperation.
2??/2?? Duration & 600/610 Lift at 114 Lobe Seperation.
And if this is the G5X3.. Then how bigger could the G5X4 be?
The equation for overlap (at a specific lift, most durations used are at .05" lift) is:
((Intake duration + exhaust duration) divided by 4), minus LSA, then multiplied by two.
Well, i have seen a dyno graph of the t-rex. It seems to look like it ramps up quick and then kind of falls off (hp) but the TQ seems to hang in there. Looks like it might not be that streetable of a cam.
What does the curves look like on the other "big" cams? Magic Stick, G5X3, etc.
I have been looking around but have not stumbled on any of them yet. Thanks
What does the curves look like on the other "big" cams? Magic Stick, G5X3, etc.
I have been looking around but have not stumbled on any of them yet. Thanks
Last edited by waterbug1999; May 11, 2005 at 03:03 AM.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Also keep in mind that some cams will fit on stock heads at 114 lsa without flycutting and some won't at 112.
With G5X3 for example, it is preferable to flycut on a 112.
It will fit but the PTV tolerances are suicidal for the street.
PTV acceptable tolerance depend on how gutsy the owner is.
The amount of overlap is what determines how far you can go before running on vacuum issues with A4, as stated above. This is largely due to the intake shape we run on the LSx motors.
In Aussie land, they have solved that with pretty nifty ITB set ups and are able to run very tight lsa's (106 is the one I heard), that idle like a baby 224 with our intakes.
With G5X3 for example, it is preferable to flycut on a 112.
It will fit but the PTV tolerances are suicidal for the street.
PTV acceptable tolerance depend on how gutsy the owner is.
The amount of overlap is what determines how far you can go before running on vacuum issues with A4, as stated above. This is largely due to the intake shape we run on the LSx motors.
In Aussie land, they have solved that with pretty nifty ITB set ups and are able to run very tight lsa's (106 is the one I heard), that idle like a baby 224 with our intakes.
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Verdad Gallardo TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
I found the link with a vid:
Here is a video 242/242 106 LSA 105 ICL idling @ 875-925...
http://users3.ev1.net/~black_ops/video/242-106.mpg
Here is a video 242/242 106 LSA 105 ICL idling @ 875-925...
http://users3.ev1.net/~black_ops/video/242-106.mpg
