I'm going for it. 4 exhaust cams!! :)

[SappySE107]

It uses the front intake cam for the timing mark.

[Kohburn]

you are running 4 exhaust cams in a 97? What is it using for the cam sensor?

thats what I was wondering

[your_I.D.]

The exhaust cam is fat enough to allow some customizing. I ground cam down and made my own raised spot. It wasn't to bad to do. I'll post pics in my photo bucket. http://photobucket.com/albums/a133/d...t%20cam%20mod/

Frist thing I did was determine the height differance and location of nub. Then used a 1/16 drill bit. Wrap a piece of masking tape around drill bit for depth gauge. Roughly 1/4 of an inch. Then drilled holes to outline nub at the correct location on the cam.
Then drill holes all the way around at the same depth and perdendicular to cam. To use as a referance when grinding. I wouldn't recommend you do it by hand. Use a drill press and a 4x4x18 block of wood. With a vee cut in it to hold cam. Then with a highspeed die grinder and a carbide burr. Slowly and carefully grind material away. Until you reach the bottom of the holes you drilled.
Then to grind down between nub and cam bearing surface.

Use a die grinder and a new 3 inch cut off wheel. (more to come)

[OldSkoolGP]

What year cams did you use again? I have a 96 set I was going to get mocked up so we had specs, but maybe you already did that.

[Kohburn]

interesting thing is that with the 91-93 computer you don't even have to make the cam timing post.. just have to time the cam right and you'd be set..

[your_I.D.]

What year cams did you use again? I have a 96 set I was going to get mocked up so we had specs, but maybe you already did that.

I used 95 exhaust cams for intake and 97 for exhaust.
Once I get them dialed in a little better. It needs some overlap taken out of it. I'll get a total degree amoumt the crank needs to turned. While holding cam by timing flat. The best way is to use a dial indicator to find the exhust lobe center angle for #1 cylinder and #4. (#4 is TDC also when #1 is TDC. just differant stroke) With -8° cam timing already added with timing tool. (unless its a new exhaust cam with -4° ground in from factory. Then you would only add -4°.(crank degrees) or -2° at cam which = -4° crank degrees.) I came up 110° crank degrees from TDC exhaust\intake stroke. Since the lobe profile's are symatrical. Intake cam lobe center angle is set at 110° after TDC. Giving you +8° advance on the intake cam. Since you are going by ECA and ICA it doesnt matter what year cam exhuast cam you use for your intake. Because you are not going by timing flats when setting it. In example below is how the cam specs came up and how I set it to start with.


I'm going to be resetting timing in the next few days. I'll take some photos of process and cam lobe locations for referance.

[Guest]

updates

[RednBlack]

I need results also.

[your_I.D.]

So far so good. I haven't been able to adjust cam timing again. I need to try -6 and +6 degrees. Its all top end now. With -8 and +8 degrees.

[your_I.D.]

Changed oil last night. Pulled front valve cover to check for any abnormal wear. Everything looked good. Still haven't been able to reset timing. 55 hours OT in 2 weeks, doesn't leave much time for anything else but sleep. ;(

[TurboGt]

Where did you get the cam math calc?

[your_I.D.]

Where did you get the cam math calc?

part of "Desktop Dyno2003" program

[your_I.D.]

Well just completed my timing adjustment. Cheated and only adjusted exhaust timing. I left Intake timing at +8º and set exhaust to -4º. Major improvement in the bottom end. Almost ready for a dyno run now.

[fieromadman]

it'll be very interesting to know what that will dyno at now. Keep us informed!

[LeftVentricle]

So what's the verdict?