function lovellcalc() {
	if(document.form1.bore.value == "") {
		alert("Please enter a bore diameter in millimeters!")
		document.form1.bore.focus()
		return false
	}
	if(document.form1.stroke.value == "") {
		alert("Please enter a stroke in millimeters!")
		document.form1.stroke.focus()
		return false
	}
	if(document.form1.inlet.value == "") {
		alert("Please enter a valve diameter in millimeters!")
		document.form1.inlet.focus()
		return false
	}
	if(document.form1.numvalve.value == "") {
		alert("Please enter number of inlet valves per cylinder!")
		document.form1.numvalve.focus()
		return false
	}
	if(document.form1.rpm.value == "") {
		alert("Please enter peak RPM, no commas!")
		document.form1.rpm.focus()
		return false
	}
	
	temp1 = document.form1.bore.value * 1
	temp2 = temp1 / 2 
	temp3 = temp2 * temp2
	areabore = temp3 * Math.PI
	strok = document.form1.stroke.value * 1 
	spin = document.form1.rpm.value * 1
	temp4 = spin * strok
	temp5 = temp4 * 2
	temp6 = temp5 / 60000
	temp7 = document.form1.inlet.value * 1
	temp8 = temp7 / 2  
	temp9 = temp8 * temp8
	temp10 = temp9 * Math.PI
	nvalve = document.form1.numvalve.value * 1
	areavalve = nvalve * temp10
	ratio = areavalve / areabore
	temp11 = temp6 / ratio
	test = temp11
	tempj = Math.round(test * 100)
	tempk = tempj * .01
	daRatio = parseInt(tempk * 100) / 100 
	document.form1.factor.value = daRatio
}