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  #1  
Old 03-01-2012, 02:10 AM
colwell707 colwell707 is offline
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Default slow between shifts. Help!!

So here is the story. Bought my 99 1500 4x4 5 speed with a smoked motor 5.2 magnum. Did a full rebuild. Also put in a comp cams small RV cam and heavier valve springs. Everything of inportants was replaced or gone through.

The problem I'm having is it seems slow and definately a dog between shifts. Anybody have any idea what this might be? Solid vaccum pressure. Timing is solid.
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Old 03-01-2012, 10:33 AM
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ramvan2500 ramvan2500 is offline
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Quote:
Originally Posted by colwell707 View Post
So here is the story. Bought my 99 1500 4x4 5 speed with a smoked motor 5.2 magnum. Did a full rebuild. Also put in a comp cams small RV cam and heavier valve springs. Everything of inportants was replaced or gone through.

The problem I'm having is it seems slow and definately a dog between shifts. Anybody have any idea what this might be? Solid vaccum pressure. Timing is solid.
The first thing I recommend is that you do a fuel pressure test, make sure it's at 43.5 PSI, 40 MIN.

The next thing I'm going to ask is what Cam did you get, the timing might be right, but the engine might not be producing enough torque at low RPM's. Also did you make sure to match the torque converter to the cam application, on comp cams site they have a camselect thing that will give you theoretical dyno results will also give you an indication of a properly selected torque converter.

This is what I can think of for right now. I noticed the comp cams have grinds that are advanced 4 degrees if installed dot to dot where the stock cam has a grind which is retarded 3 degrees when installed dot to dot.
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Old 03-01-2012, 01:20 PM
colwell707 colwell707 is offline
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Fuel pressure is good. It's a 5 spd manual. So it doesnt come back alive when I shift. We could only get the cam to degree in at 106* and its a 108* cam. Not a problem normally. By the way no one makes cam keys for magnum motors. Had to custom make one. Im almost thinking of just sticking the stock key back in it and see what it does.
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Old 03-01-2012, 10:38 PM
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ramvan2500 ramvan2500 is offline
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Originally Posted by colwell707 View Post
Fuel pressure is good. It's a 5 spd manual. So it doesnt come back alive when I shift. We could only get the cam to degree in at 106* and its a 108* cam. Not a problem normally. By the way no one makes cam keys for magnum motors. Had to custom make one. Im almost thinking of just sticking the stock key back in it and see what it does.
Yea I know, Comp' intake center lines are almost always 108 for the magnum motors, I hate that because since the grind is advanced 4 degrees in order to get the center lines to match well atleast get the timing events to match the cam would have to be retarded 7 whole degrees and that would be NUTS! I'm going through the same garbage as you did.

I think it's timing related, the cam is matched to the dam ECM. The people we usually talk to at comp are just idiots not the engineers, the engineers are busy doing the real work.
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Old 03-02-2012, 01:48 AM
colwell707 colwell707 is offline
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Default

I'm just going to stick the stock cam key in it and see what I come up with. If that doesnt work im going to checking to see if that rockers need to be shimed because the guy who helped me said that maybe that the valves arent sealing. By the way im not a big motor guy. Kind of learning as i go.
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Old 03-02-2012, 07:33 PM
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Originally Posted by colwell707 View Post
I'm just going to stick the stock cam key in it and see what I come up with. If that doesnt work im going to checking to see if that rockers need to be shimed because the guy who helped me said that maybe that the valves arent sealing. By the way im not a big motor guy. Kind of learning as i go.
Well tell me how it works out, hopefully you've got it!
I'm not to big of a motor person, I'm more transmission then motor but I do know a bit.
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Old 03-02-2012, 09:10 PM
colwell707 colwell707 is offline
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I hope it works too because I'm not looking forward to shimming the rockers. Probably be paying omeone to do that. Im more of the axle and suspension guy. dont have all that trouble shooting experience with motors like some do.
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Old 03-02-2012, 09:13 PM
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ramvan2500 ramvan2500 is offline
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Quote:
Originally Posted by colwell707 View Post
I hope it works too because I'm not looking forward to shimming the rockers. Probably be paying omeone to do that. Im more of the axle and suspension guy. dont have all that trouble shooting experience with motors like some do.
I hate doing axle and suspension work, specifically axles. I wouldn't mind rebuilding a rear end if it was removed from the vehicle but then it costs more money, for me atleast.

Well hopefully you won't have to space the rockers!

Tell me how it works out though.
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Old 03-02-2012, 09:58 PM
colwell707 colwell707 is offline
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Will do! Thanks for your advice.
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Old 03-09-2012, 02:47 PM
colwell707 colwell707 is offline
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Well talk to the people over at comp cams and you were right. Not much for help. Going to try the guys at hughes engines and see what they think.
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