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Comp Cams Choices?


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#1 WMCCALL

WMCCALL

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Posted 07 May 2013 - 11:51 AM

On Comp Cams website they state in the notes for the 4.0L camshafts that only one is for fuel injected (Grind#: X4250H-13, Part#: 68-232-4). It’s puzzling. On retailers (Summit, etc) websites nothing is said about it. My choice is the Part#: 68-200-4, Grind#: 252H due to your build channel. Given Comp Cams choices and whatever someone’s personal choice is, does it really matter between fuel injected or not just as long as it is a hydraulic flat tappet camshaft? Ref: http://www.compcams....y Engine Family

#2 Moses Ludel

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Posted 09 May 2013 - 10:07 PM

Wayman, this question comes up consistently, and of course, you should read footnotes from the manufacturer's listings. The camshaft I recommend with the 4.6L stroker build, and with the Mopar EFI conversions on the 4.2L, is the CompCams 252 grind—not the 232. Tony Hewes and I both run this camshaft in fuel injected inline six-cylinder engines without issue.

The grind has been around for a long time, I first tried it on 383 Chevy SB V-8 stroker motors built for off-road use and trailer pulling in the late 1980s/early '90s timeframe. It was phenomenal for low-end torque, a lower rpm ceiling (4,200-4,600 rpm, will run out around 5,000 rpm) with peak torque by 2000-2400 rpm, depending upon engine application. Manifold vacuum at lower speeds is excellent.

All of that said, my first use in an inline six was a Ford 300 with MPI. It ran flawlessly, again with a quick torque rise and great bottom end. Move to the 4.0L and 4.2L or 4.6L Jeep inline six, again a success story.

The 4.6L in the '98 XJ Cherokee that I talk about in the vlog discussion was built by Hewes Performance with the 252 grind, as was the 4.6L in the CJ-8 Scrambler walk-around video. This camshaft delivers! I use it...We've run the cam with stock injectors and with Ford 24 pound injectors in 4.6L Jeep buildups.

Perhaps CompCams wants to avoid emissions controversy here, although there's no reason to suspect higher tailpipe emission readings...We've seen no check lights, either, even with the 24 pound injectors. We're holding compression to 8.7:1.

Moses


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