Carb vs. EFI cam
Hey all,
I am planning my magnum swap and had a question about cams for carb vs. efi motors. I was thinking about going carb to start and eventually switch to efi. I noticed that the LSA is different on the cams for these applications. Why the difference? Would a cam for one application severly hamper power in the other application?
Thanks
CE
I run the Factory JTEC EFI with a Hotwire Hotrod harness and an SCT Tuned ECM out of a non-security fob'd manual trans 3/4 tone Dodge Ram.
I was running a mild 110* LSA cam in both my stock stroke stock head 5.9 Magnum and my 408" stroked Eddie headed Magnum. I've since swapped in a 108* LSA cam with slightly more duration and lift in the 408" motor.
The 108* LSA cam really woke up the motor in the midrange and top end. It helped it take advantage of the Hughes Supper Prepped heads with additional hand blending in the ports. This motor has a bit higher compression too, and cranks 200 psi.
I haven't measured the vacuum at idle, but the tuner compensated for this with the tune. Hughes states this combo should crank out 510+ hp with this cam. The way it runs, I believe its in that range.
Cam selection is really about getting ALL the driveline components matched to work together from gear ratios, trans stall, induction, heads, compression and exhaust. What works in one combo could be less effective in most others.
It also has to hook up. My '68 is most effective when it's coming out of the hole, but does pretty decent all the way down the track.
