Anybody running an XFI cam with less than 113 LCA?
03-04-2007, 10:49 PM
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Anybody running an XFI cam with less than 113 LCA? Just as the title says........
It seems to me by going with one of these on a 113, you`re giving up some power.
Thoughts?..........
It seems to me by going with one of these on a 113, you`re giving up some power.
Thoughts?..........
03-05-2007, 02:52 AM
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They have a good bit of overlap already. You could be giving up some power, but it seems that these cams don't need very high rpm to make their peak power and therefore, don't require as much overlap for scavenging. I'm sure someone will add to this.
03-05-2007, 08:29 AM
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They have a good bit of overlap already
Is it because of how aggressive these lobes are that there is no need for alot of overlap (and the baggage overlap carries for street use). They compensate because the lobes open so much quicker.
Say if you compare an XFI lobe #3015 (224* @.050") with 149* duration @ .200" and a regular Xtreme Energy lobe #3314 (also 224*) with 145* @ .200". The XFI lobe acts a little bigger even though it`s @ .050" duration is the same as the regular Xtreme Energy lobe.
03-05-2007, 01:52 PM
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You recommend custom to everyone, but they're not for everyone. I agree that there are usually better results from them in a H/C package, but there are other, cheaper options that people like to discuss.
Also, there have been some great results with these cams, just have to find the right combo.
http://web.camaross.com/forums/showt...hlight=xfi+396
http://web.camaross.com/forums/showt...&highlight=xfi
Also, there have been some great results with these cams, just have to find the right combo.
http://web.camaross.com/forums/showt...hlight=xfi+396
http://web.camaross.com/forums/showt...&highlight=xfi
03-05-2007, 01:58 PM
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Originally Posted by cdb95z28
Educate me on this.
Is it because of how aggressive these lobes are that there is no need for alot of overlap (and the baggage overlap carries for street use). They compensate because the lobes open so much quicker.
Say if you compare an XFI lobe #3015 (224* @.050") with 149* duration @ .200" and a regular Xtreme Energy lobe #3314 (also 224*) with 145* @ .200". The XFI lobe acts a little bigger even though it`s @ .050" duration is the same as the regular Xtreme Energy lobe.
Is it because of how aggressive these lobes are that there is no need for alot of overlap (and the baggage overlap carries for street use). They compensate because the lobes open so much quicker.
Say if you compare an XFI lobe #3015 (224* @.050") with 149* duration @ .200" and a regular Xtreme Energy lobe #3314 (also 224*) with 145* @ .200". The XFI lobe acts a little bigger even though it`s @ .050" duration is the same as the regular Xtreme Energy lobe.
The RPM ranges given by comp are also a lot lower than the other common LT1 grinds, which may mean they can make better power in a lower range for stock bottom ends. Possibly...
03-05-2007, 01:58 PM
#7
120mph out of an afr 396 with a cam that big really isn't that impressive to me, but as long as the people are happy with what they are runnings thats all that matters to them anyway. Considering a custom cam is only $300 (atleast mine was I don't know what other places charge) vs 260 for an off the shelf it seems like a no brainer to me, but I don't want to to turn this thread into a huge debate like they always seem to, so back on topic.
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03-06-2007, 01:55 AM
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A friend of mine has a home built 383 with AFR 190cc heads, and 100 of spray after the 60ft with the XFI-468 cam..11.30 with a crappy 1.8 sixty foot. I'd say their working..Just my opinion
03-06-2007, 02:45 AM
#11
Originally Posted by siniSSter
A friend of mine has a home built 383 with AFR 190cc heads, and 100 of spray after the 60ft with the XFI-468 cam..11.30 with a crappy 1.8 sixty foot. I'd say their working..Just my opinion
03-06-2007, 08:43 AM
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Hell, I ran 120mph in 78* air temps w/ my stock short block.. see sig
So you have an xfi cam???
No mention of XFI in sig.
That was with my small (the smallest SR I`ve seen anybody run) Xtreme Energy solid roller, thru a dual cat y-pipe, Borla cat-back (no true duals) 78* temps, stock clutch, untouched intake (w/ the exception of opened up TB mouth). I had no traction for better ETs. The stock clutch wasn`t helping either! And to put this SR cam in perspective w/ a similar XFI, the XFI looks more aggressive!
And of course, no N2O!
A friend of mine has a home built 383 with AFR 190cc heads, and 100 of spray after the 60ft with the XFI-468 cam..11.30 with a crappy 1.8 sixty foot. I'd say their working..Just my opinion
People are running faster than that if not faster with ALOT smaller cams and stock ported castings without nitrous , but if you guys want to keep thinking those are impressive times for cams that big go ahead and keep thinking that.
Right now I`m not concerned w/ times, I just was curious about the XFI`s and why Comp stuck them on long LCAs. That`s it.
03-06-2007, 08:46 AM
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A friend of mine has a home built 383 with AFR 190cc heads, and 100 of spray after the 60ft with the XFI-468 cam..11.30 with a crappy 1.8 sixty foot. I'd say their working..Just my opinion
I`ll give him a break here w/ that 60` time.................
03-06-2007, 09:41 AM
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Originally Posted by speed_demon24
People are running faster than that if not faster with ALOT smaller cams and stock ported castings without nitrous , but if you guys want to keep thinking those are impressive times for cams that big go ahead and keep thinking that.
I hope someone else will chime in about the LSA on these more agressive cams.
03-06-2007, 12:14 PM
#15
Originally Posted by cdb95z28
No.
No mention of XFI in sig.
That was with my small (the smallest SR I`ve seen anybody run) Xtreme Energy solid roller, thru a dual cat y-pipe, Borla cat-back (no true duals) 78* temps, stock clutch, untouched intake (w/ the exception of opened up TB mouth). I had no traction for better ETs. The stock clutch wasn`t helping either! And to put this SR cam in perspective w/ a similar XFI, the XFI looks more aggressive!
And of course, no N2O!
I agree, ABA383, among others, is there w/o the nitrous and he has a "baby" Joe O cam.
Right now I`m not concerned w/ times, I just was curious about the XFI`s and why Comp stuck them on long LCAs. That`s it.
No mention of XFI in sig.
That was with my small (the smallest SR I`ve seen anybody run) Xtreme Energy solid roller, thru a dual cat y-pipe, Borla cat-back (no true duals) 78* temps, stock clutch, untouched intake (w/ the exception of opened up TB mouth). I had no traction for better ETs. The stock clutch wasn`t helping either! And to put this SR cam in perspective w/ a similar XFI, the XFI looks more aggressive!
And of course, no N2O!
I agree, ABA383, among others, is there w/o the nitrous and he has a "baby" Joe O cam.
Right now I`m not concerned w/ times, I just was curious about the XFI`s and why Comp stuck them on long LCAs. That`s it.
