boost pressure, cam timing

[hartwrenches]

I'm wondering if you have to change all the electronics on a NA engine even if its a small amount of boost? Also I had my head milled when the valves were done and now the cam timing mark seems half a tooth off, I have no top end power, so I'm shifting out of 5th alot.

I don't know how to navigate this forum real well, is there an easy way to see if people have responded, especailyly to remarks in old threads?

 

[SMTGREG]

When milling the head it changes the cam timing. The best way to get the timing correct is to use an adjustable cam pulley.

 

[4b316]

How much did you mill it?Have you moved the belt back the half tooth you said you gained?Usually you don't have to get a adjustable gear until you mill at least 30 off the head.You are boosted?How much are you running?

 

[hartwrenches]

boost

How much did you mill it?Have you moved the belt back the half tooth you said you gained?Usually you don't have to get a adjustable gear until you mill at least 30 off the head.You are boosted?How much are you running?

The head was milled 10 thou. How would I move it only half a tooth? I got a turbo from a basket case engine and don't have any of the electrical stuff. Don't want to install turbo until I have everything I need.

 

[4b316]

I didn't mean to move it a half tooth,I meant to jump it back a tooth and see if was any better.Yes,10 thou shouldn't have to get a adjustable gear.We did open up the keyway on one of the race motors in years back to move it ahead a little but now we can use a adj.gear

 

[scracing41]

I found this on 4m.net. A forum a lot of mini stock 2.3L guys use. It mentions head shaving retarding cam timing and JBV Heads (Joe) mention this amount below.

1 degree per .025 shaved.

Joe
__________________
Joe

tech@cpengineperformance.com