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Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
Ok back together, and got the degree wheel out.
First off, the cam card says my lobe separation is 113 deg, and my centerline is 110, therefore the cam has a natural advance of 3 deg.
and @ .050 of lift on the intake I should have a reading of 13 deg on the degree wheel. so.....
with the mopar chain set at factory I get a reading of 17.5 deg therefore Mort is 1.5 deg retarded. 17.5 - 13 - 3 = 1.5 retarded
with the Mopar chain set at adv I get a reading of 13.5 deg therefore Mort is 2.5 deg advanced. 13.5 - 13 - 3 = 2.5 advanced
what I am planing on doing in the morning is drilling the cam sprocket and adding a 2 degree adv spacer. theoretically giving me an advance of 4.5.
How does my math look to everyone? does this make sense??
Last edited by Pookapotamus; 05-16-2015 at 07:05 PM.
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
I think it does. 4.5° is quite a bit
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Well if the cam was designed to be run at 3 a bit extra should not hurt!
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
No. I did a little reading and I guess 4-6° is what you advance for a change of 500 rpm in the torque curve
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Then that's what I will shoot for! Thanks Steve!
I'm going to run through the whole setup again and double check everything!!
Last edited by Pookapotamus; 05-16-2015 at 08:33 PM.
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
Timing math is hard.
Tell Me about it!!!! I am more confused than ever!!!!
After removing 4 pistons so that everything spins extremely smooth then re-finding TDC I get numbers that seem out the window!!!
This run of numbers with the chain at zero says that Mort was running 23° retarded. The cam card says I should have .050" lift on the intake lobe at 13° BTDC, @ .050" lift I get a reading of 10° ATDC.
With the chain set for adv, @ .050" lift I get 5° ATDC.
so this it telling me that I am reading the wheel right, adv is working, everything is in the proper direction. But Mort was seriously retarded.
Can I really be that far retarded? there are a lot of factors that could add up to this, like the 4.2L crank in a 4.0L.
I am going back out to my kitchen to measure everything again from scratch!
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
Yup, a conundrum
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Redid everything, took the timing chain off, messed everything up, then started from scratch.
I sill get 23 deg retarded
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
That could be. Are you using the 4.2 timing gears too?
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Ok so 1 tooth out and 4 degree bushing sets it at 14 deg, I guess I'm happy with that, I will reassemble and see if it turns over without hitting a valve.
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
You can see that the timing marks are off.
Having 4WD just means getting stuck in more inaccesible places
http://www.xjtalk.com/showthread.php?t=9215
http://www.xjtalk.com/showthread.php...659#post203659
http://xjtalk.com/showthread.php?t=19085
Well, as long as it works, so be it. You are going to have a torque monster
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
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