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Old 12-04-2012, 12:46 PM
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vinniekq2 vinniekq2 is offline
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so many variables that its not as simple as spreading or narrowing lda.The intake valve closing and CR need to be matched,even more critical when economy and pump gas are involved.Techinspecter is probably one of the best guys here to optimise intake valve closing times for street cars.

rough way to work with LDA is the narrower angles will have more over lap,rougher idle,lower vacuum.They are usually more advanced icl and make more bottom end power with a narrower power band. A wider lda will idle smoother and make perhaps more top end power or rev/make power to a higher RPM.

super stock engines quite often have a very advanced ICL because of low compression ratio and need to close the intake soon enough to not bleed of to much compression,but those cams are also fairly long duration with significant lift.
Its all mathematical formulas with uncountable combinations possible.
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