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Old 05-27-2009, 09:02 AM
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Cam/Lifter Issues

Hey Gang..

I have an issue with the new cam I installed. I contacted Comp Cams and got their advice on a camshaft. They suggested a 268 XFI HR13 camshaft. I have a 383 Eagle Crank, Eagle Rods, Speed Pro flat top 2 valve relief pistons, Dart Aluminum 72cc chambers, 180cc intake runners, TPI 24lbs injectors, 58mm throttle body Harris Proformance Chip. I have a roller block. I installed the cam new roller lifters, 1.6 rockers. It ran okay. I was not too impressed. I pulled a Comp XE262H. Changed springs to Engine Pro 1.437 135# @ 1750 install height. When I installed the heads I checked the springs and after the break in the springs were 130# on the seat. And 300# at .575 lift. I ran the engine for about 3 weeks and I bet I adjusted the valves 4 times. At idle they was no noise. at about 2500 rpm I could hear the lifters. Well last week I was out for a drive and was going down the highway at about 70 mph and the rpm were around 2100 and 50 lbs oil pressure(Tremec TKO600 with 3.08 gears and 25.5 tires) I started to hear my lifters. So I went home and pulled the valve covers and started adjusting the lifters. Started it back up with the valve covers off and noticed my rockers looked like they were metal flaked. So I shut the engine down and started pulling the motor apart. I thought I must have wiped out the camshaft. got the cam out and it looked perfect, so my next thought was must have wiped out some bearings so I pulled the pan and started looking at bearings looked like new. the only thing I can think of is it must be coming from the inside of the lifters. I put the old XE262H cam in and pulled the inter springs now I'm at 110 on the seat. Got it back together last night and sound great 60 lbs at cold idle and 50 at warm idle. lifters are quite as a church mouse. I've heard some folks are having problems with the roller lifters on these XFI camshafts because of the aggressive ramp on these camshafts. Any suggests, comments, abusive statements??

Thanks Mitch

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Old 05-27-2009, 09:20 AM
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To roll, or nor to roll, that is the question.

Rollers are a completly different animal to me, but did you have a zinc addative in the oil before you fired up and ran it? If not there is a good chance that you did beat that cam up a bit. It may not look like it on the lobes, but I'll bet if you took the micrometers to it it will be a different story. I've killed camshafts in ten minutes during break in all because I didn't have a good zinc addative. These are just my thoughts, hope they helped.
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