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Old 09-19-2015, 11:37 AM   #1
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Camshafts

Im planning to buy Camshafts XE274H stage 4...Is it ok to put those in a stock 4.6 engine without changing the springs?? And what about long term reliability??Is it safe?


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Old 09-19-2015, 11:54 AM   #2
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On a stock motor I believe you'll have PTV issues. Probably not the safest.


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Old 09-19-2015, 12:16 PM   #3
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I've heard that the 99-00 used different pistons than the 01-04...Im affraid damaging the engine...


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Old 09-19-2015, 05:44 PM   #4
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*edited* I double checked the specs. I was wrong. You will have no PTV clearance problems but you will need new valve springs. With only a .500 lift the cam should be good for the 2k-6k it claims. Not a huge fan of comp cams myself I'd suggest crower stage 1 over this 'stage 4' cam personally.
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Old 09-19-2015, 09:54 PM   #5
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For sure use the beehive springs!!! They are a must, I just did the comp 270's and they had to check piston to valve cause they were close.. Might have to even ****** the timing for 274's
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Old 09-19-2015, 10:17 PM   #6
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your 270's have more lift than the 274's. by quite alot(quarter inch) in fact. Your 270's have more extreme lope and idle. his 274's are only .500 lift so its an easy fit
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Old 09-19-2015, 10:26 PM   #7
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I thought they were more radical? Stage 3 to his stage 4..
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Old 09-19-2015, 10:30 PM   #8
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it all comes down to duration and lobe seperation. His stay open longer and are on a narrower lobe seperation. His idle is smoother but flows more air overall. More of a blower cam. A N/A cam opens wide but briefly.
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Old 09-19-2015, 11:08 PM   #9
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Which gives the more choppy idle correct?
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Old 09-20-2015, 01:04 AM   #10
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Yes the wide quick open close is what gives you the lope

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Old 09-20-2015, 07:12 AM   #11
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By god I'm learning something lol
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Old 09-20-2015, 11:09 AM   #12
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Slower lift rate with more valve overlap accounts for a good chunk of what makes certain cams sound good.


You know those old school V8s with flat tappet cams? That's one of the reasons for the old school sound. They had to run slow lift rates. They could have the peaks of the lobes be separated pretty far out and still have valve overlap for days
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Old 09-20-2015, 11:39 AM   #13
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Quote:
Originally Posted by retiredvet View Post
Yes the wide quick open close is what gives you the lope

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Ehh, valve overlap is more of the central topic.

Modern engines all have really steep cam profiles. Steep cam profile is actually why modern engines DONT lope like the old ones. The engines have more static compression because of this. The valves don't overlap as much anymore.

Think about the ghost cam tunes. All those do is add valve overlap with the stock cam's lift and duration, but it still chops pretty good. It would chop even more if the cam profile was more gradual, so there was more valve overlap.


Lift and duration definitely are factors in how choppy it sounds-- because those increase the valve overlap and decrease the static compression even more. the eccentuate the phenomena that makes it lopey
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Old 09-20-2015, 03:48 PM   #14
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Well I tend to keep things on the k.i.s.s. level when helping people learn the fundamentals

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