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Jan 28, 2008 2:03 pm
Jan 28, 2008 2:03 pm
Subject: Re: 2L engine problem
hi all,
Something that has been missed with regards to cam profile design is this.
The cams that Tim designed and we made were designed with concave flanks, this allows the engine to perform much better than an engine fitted with flat sided flanks (ala the club profile) due to the fact that it "tricks" the engine at low revs into thinking that it has mild cams with less overlap fitted when in fact they have quite heavy overlap and high lift.
please remember that timing figures and lift are not everything, Flank shape is VERY important if not more important and Tim worked very hard to develop this profile for just this reason.
And because of this unusual profile they are rather expensive to manufacture, but so much better than having a slow 2 litre Lagonda!
Julian.
hi all,
Something that has been missed with regards to cam profile design is this.
The cams that Tim designed and we made were designed with concave flanks, this allows the engine to perform much better than an engine fitted with flat sided flanks (ala the club profile) due to the fact that it "tricks" the engine at low revs into thinking that it has mild cams with less overlap fitted when in fact they have quite heavy overlap and high lift.
please remember that timing figures and lift are not everything, Flank shape is VERY important if not more important and Tim worked very hard to develop this profile for just this reason.
And because of this unusual profile they are rather expensive to manufacture, but so much better than having a slow 2 litre Lagonda!
Julian.