darren(SA)
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| posted on 5/11/02 at 09:40 PM |
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Split cam
Hi guys,
I'm sure you guys have heard of a split cam,(although haven't seen anybody mention 1) anyway, In SA, this is a fairly new idea(always behind you
guys). I got myself a 276/268 (276 on exhaust I think, 268 inlet) for my golf and was Impressed by the gain in topend with minimal loss in bottom
end(comparing to the normal 276).
Now, getting to the point, I have a 288 cam sitting in my fully modded 1600 crossflow (yet to be started->biting nails )
and was just wandering If anybody has ever put in a split cam (say 288/276) in there crossflow?
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JohnFol
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| posted on 6/11/02 at 09:15 AM |
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I've not heard the phrase before. What is a split cam?
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MK9R
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| posted on 6/11/02 at 11:21 AM |
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Is that the type of camera used to make porn films??
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Mark Benson
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| posted on 6/11/02 at 02:00 PM |
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The only thing I can think you mean is a system like Honda's vtec system?
2 Cam profiles on the same shaft, the shaft 'switches' at a pre-determined engine speed allowing greater lift from the valves.
Gives the benefit of high-lift cams but without the loss in low-end grunt.
How that would translate to a crossflow I have no idea.
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Big Stu
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| posted on 6/11/02 at 03:03 PM |
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I read it that the cam profile is different for the exhaust than the intake? or have I got the wrong end of the shaft?
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James
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| posted on 6/11/02 at 04:28 PM |
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quote:
Originally posted by Big Stu
I read it that the cam profile is different for the exhaust than the intake? or have I got the wrong end of the shaft?
That's the way I understood what he was saying aswell.
James
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darren(SA)
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| posted on 6/11/02 at 07:54 PM |
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quote:
I read it that the cam profile is different for the exhaust than the intake? or have I got the wrong end of the shaft?
thats correct. For mine 276/268 the 276 on the exhaust 268 on the inlet.I think it decreases the overlap? anyway, gives you same topend as 276 and
retains stronger bottom end.
quote:
Most cams for the 8v's are cut with the same duration on the intakes as the exhausts. So a 276 will have both the intakes and exhausts at 276 deg
duration. A split cam will have different exhaust durations than intake duration and what that means is that you can say have a 276 exhaust and 268
intake which gives a very nice 'inbetween' compromise. They tend to idle a lot less erratic - drop less bottom end and still have a bit of oomph up
in the rev range.
from the GTi website of SA
darren
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