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Dirt Bike Brands - Other
Yz444 Tuning: Building a Monster Torque Curve
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[QUOTE="Rich Rohrich, post: 825194, member: 16241"] Phil - If the money isn't there for the cams initially you can retard the cam timing LCA a bit by having the base of the barrel machined a bit. If you are building a serious YZF engine the squish should be brought into the .045" range anyway so setting the deck can have the two-fold effect of improving combustion efficiency and making the cam timing a bit more favorable in terms of IVC timing. On the meg a couple of rules of thumb that I have found useful over the years. Shoot for an 8 degree (16 included) angle on the meg for maximum efficiency, and keep in mind that the engine will see about 1/3 of the meg length as pipe tuned length so make sure and take that into consideration as you are determining your final lengths. If you haven't already done it do a DRN Search on the posts by Swiss. Jim Schneider (aka Swiss as in Swiss Cheese Factory Racing) is a really sharp guy and has probably forgotten more about building pipes than most of us will ever know. [/QUOTE]
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Dirt Bike Brands - Other
Yz444 Tuning: Building a Monster Torque Curve
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