401tuner

working on my buddys gsr build and i was havin a hard time finding the centerline because the cam dwells at peak lift, i was wondering if i could take a reading of the degree wheel when the cam reaches max lift less than 0.003 inch before and after peak lift. and then find the middle of those two positions and it would be the centerline?


and when degreeing a cam im making sure that i rotate the crank in the direction the engine normally runs. because i dont want to over shoot the position the crank is supposed to be in, so i wont rotate the engine backward. i figured it would throw off my numbers because the tensioner only works properly in one direction i think.

drift4jesus

I could be wrong here as I am no expert but I thought that the lobe center was the # between when the valve opens and when it closes. Hence lobe center.

Combustion Contraption

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drift4jesus &raquo;</TD></TR><TR><TD CLASS="quote">I could be wrong here as I am no expert but I thought that the lobe center was the # between when the valve opens and when it closes. Hence lobe center. </TD></TR></TABLE>

The would only be true if the opening and closing ramps were mirror images of each other.

bluedlude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">The would only be true if the opening and closing ramps were mirror images of each other.</TD></TR></TABLE>



but im sure someone knows where the centerline is. give em a little while and im sure you'll get your answer.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">working on my buddys gsr build and i was havin a hard time finding the centerline because the cam dwells at peak lift, i was wondering if i could take a reading of the degree wheel when the cam reaches max lift less than 0.003 inch before and after peak lift. and then find the middle of those two positions and it would be the centerline?
</TD></TR></TABLE>

how many degrees is it at peak lift?

401tuner

yea im stumped, im trying to figure out a soultion, and i have posted this in the tech fourm and the integra fourm, and have yet to come up with an answer, so i figured i'd give the all-motor fourm a shot, because i know theres a lot of smart guys in here.

bluedlude

well, look at it like this. if you have peak lift for 5 cam degrees, thats within the adjustability of cam gears, so as long as you are using adjustable ones you should be alright. im still surprised no ones come here with a definitive answer, but theres my two cents.

mmuller

look at the degree wheel, watch when valve starts moving back up to either direction, middle of degree diff. is your centerline