so at the moment I am doing my engine rebuild with f1 rods , and cp pistons , and the rotating assemble balanced , and will rebuild my port matched with st200 cams [orange bands]
on disassembly when I was removing the big end caps, all the bearing attached to the crank and not the cap , wonder how close I was before things started spinning
anyway on all the port matched 3l build s I have seen people either keep the 3l cams [black band] or upgrade to the st200 cams , and it is well documented that the 3l cams have good bottom and mid, but drop away top end , and the st200 cams give good top but a loss of bottom
well as I have all 3 sets at the moment , green band st24, orange band st200 , and black band st220 cams
I know it is not really accurate but I compared the st220 black band , against the st200 orange band cams, and traced around their profiles on cardboard , on the short runner st200 cam lobe it was easy to see the quicker opening , and slower closing rate on the inlet cam , so clear to see the top end power bias
but when I compared the st220 black band cams with the st24 green band cams , inlet long runner seems to match st220 lobe , and st24 short runner lobe has a slower closing rate than st220
st220 seems to have very slightly slower closing rate than st24 on the exhaust lobes
so the conclusion I have is when I did my port matched 3l 2 years ago instead of retaining the 3l cams , I should have swopped in the st24 ones from the engine I took out
maybe someone has already done this
on disassembly when I was removing the big end caps, all the bearing attached to the crank and not the cap , wonder how close I was before things started spinning
anyway on all the port matched 3l build s I have seen people either keep the 3l cams [black band] or upgrade to the st200 cams , and it is well documented that the 3l cams have good bottom and mid, but drop away top end , and the st200 cams give good top but a loss of bottom
well as I have all 3 sets at the moment , green band st24, orange band st200 , and black band st220 cams
I know it is not really accurate but I compared the st220 black band , against the st200 orange band cams, and traced around their profiles on cardboard , on the short runner st200 cam lobe it was easy to see the quicker opening , and slower closing rate on the inlet cam , so clear to see the top end power bias
but when I compared the st220 black band cams with the st24 green band cams , inlet long runner seems to match st220 lobe , and st24 short runner lobe has a slower closing rate than st220
st220 seems to have very slightly slower closing rate than st24 on the exhaust lobes
so the conclusion I have is when I did my port matched 3l 2 years ago instead of retaining the 3l cams , I should have swopped in the st24 ones from the engine I took out
maybe someone has already done this