I'm almosst ready to get my motor back together. It is a stock bottom end B18C1 with CTR/ITR cams and ported/polisehed head milled 0.030" & using 2-layer head gasket.

I know that my setup should be fine for clearances, but I awnt to clay it just to get a feel for it, as I'd like to move up to M22x cams down the road.

My question is, I would be claying the motor for clearance while vtec is engaged due to the higher lift, bot how do I do so? Under normal operation the rocker arms aren't locked for vtec.

Also, what is a 'safe' valve to piston clearance in an engine revving to 8500-9000 rpm?

Thanks!

 

We usually lock the rocker arms up manually and then turn the motor over. After that we'll degree the cams on both the intake and exhaust cams both ways and check for clearences again. That way we no how much we can safely tune the cams before we get too close for comfort.Helps out and so far..no problems.

 

basically slide the rod that holds all the lifters out, so that cylinder 1 lifters all come out then switch the pins so that the rockers are stuck together, and it will pretty much be locked in vtec.

you only need to clay cylinder 1, put the head on, adjust cams etc, check clearance, then switch the pins back when your done, iits pretty simple.

 

Thanks guys, anyone have any info on what piston to valve clearance should be?

So, when someone refers to 'degreeing their cams' they mean checking clearances for advance/retard cam timing?

One more, when degreeing advance/retard, do you do it for every 2° or ???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jvtec95 &raquo;</TD></TR><TR><TD CLASS="quote">Thanks guys, anyone have any info on what piston to valve clearance should be?

So, when someone refers to 'degreeing their cams' they mean checking clearances for advance/retard cam timing?

One more, when degreeing advance/retard, do you do it for every 2° or ???</TD></TR></TABLE>

"degreeing" your cams just means that your dialing them in so that your timing is 100% on target with the crank etc.

pick a setting thats the furthest you will go advanced/retarded when you tune, just to be safe.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18 CYA &raquo;</TD></TR><TR><TD CLASS="quote">

"degreeing" your cams just means that your dialing them in so that your timing is 100% on target with the crank etc.

pick a setting thats the furthest you will go advanced/retarded when you tune, just to be safe. </TD></TR></TABLE>