FartCanPolice

iTrader: (9)

Ok heres the scoop, I am doing another LQ4/L92 build up for a friend modeled after the 550hp car craft build, my question is, would I see a power increase (if any) using the XER281HR #54-446-11 over the cam car craft used XR281HR #54-428-11.... I know you'll ask so here are the cams' specs

XER-Basic Operating RPM Range 2,400-7,200
Intake Duration at 050 inch Lift 232
Exhaust Duration at 050 inch Lift 234
Duration at 050 inch Lift 232 int./234 exh.
Advertised Intake Duration 281
Advertised Exhaust Duration 283
Advertised Duration 281 int./283 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.595 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.598 in.
Valve Lift with Factory Rocker Arm Ratio 0.595 int./0.598 exh.
Lobe Separation (degrees) 112




XR-Basic Operating RPM Range 2,200-7,400
Intake Duration at 050 inch Lift 228
Exhaust Duration at 050 inch Lift 230
Duration at 050 inch Lift 228 int./230 exh.
Advertised Intake Duration 281
Advertised Exhaust Duration 283
Advertised Duration 281 int./283 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.571 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.573 in.
Valve Lift with Factory Rocker Arm Ratio 0.571 int./0.573 exh.
Lobe Separation (degrees) 112



From researching seems like neither have PTV issues, I would just like to see a possible increase in power with the XER...Only differences in the build from the article will be a pro systems carb, set up for the build, Katech rod bolts & a ported oil pump

FartCanPolice

iTrader: (9)

ttt bump

PREDATOR-Z

Yes, but those 2 cams are not of equal size so the 232/234 should make more power than the 228/230.
Durations being equal, there should be a small difference biased towards XER due to having faster ramps and a tad more lift.

hatdude4

iTrader: (1)

I know this is an old thread but would there be any PTV clearance issues with the XER281HR?

JakeFusion

iTrader: (7)

In what?

GarrettM

iTrader: (6)

Anybody have a link to this Carcraft build? I would like to look at it myself.

Lawhead

iTrader: (14)

Wait till Martin sees this he will help ya out!!

hatdude4

iTrader: (1)

The lq4 with l92 heads. It in a mustang if thats what you are asking.

onefast84

I have the XER281 in my 6.0 with the comp 1.75 promag rockers. There is no ptv problems with the stock 317. Not sure with the l92s larger intake valve. This cam makes great power, and is the same or very similar to the torquer v2.

greenvortec97

iTrader: (1)

Is it going to be an all out race motor? I thought 6.0+l92's = dog down low

96capricemgr

iTrader: (1)

Magazine articles are fun to read and all but I would NOT go duplicating anything they build. You can generally do better for less money if you figure out what vendors put money into R&D rather than advertizing.

nitrousking

You mean the the custom cam grinder who runs a otb cam and can't figure out why his car wont go faste with a bigger nitrous jet....

omc8

iTrader: (7)

It was a 2 part series back in April / May 2007 550hp for under $4900 and 480hp for $3775 http://www.carcraft.com/techarticles...s/viewall.html and http://www.carcraft.com/projectbuild...k/viewall.html

hatdude4

iTrader: (1)

I already have the setup in my car besides cam. Purchased it that way. The previous owner said it has a procharged corvettes cam in it and want to swap it. If he had the specs this would all be fine but was wondering how much of a cam could get installed without flycutting the pistons. Carcraft used the XR281HR and im curious if the XER281HR would be better or worse.