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Re: Just returned from the track....Something is wrong!
[Re: Crizila]
#254961
03/18/09 12:35 PM
03/18/09 12:35 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
power valve = 8.5 ( BTW, @ 3-5" yours is open ( dumping fuel )all the time - not good, and a contributing factor to your other problems...
Yeah... and one of the other problems is he may have washed out the rings -- hence his poor cranking pressure.
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Re: Just returned from the track....Something is wrong!
[Re: 64Post]
#254962
03/18/09 12:38 PM
03/18/09 12:38 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
power valve = 8.5 ( BTW, @ 3-5" yours is open ( dumping fuel )all the time - not good, and a contributing factor to your other problems...
Yeah... and one of the other problems is he may have washed out the rings -- hence his poor cranking pressure.
Ding ding ding...winner That can happen. Does your oild smell like gas, or has it ever?
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Re: Just returned from the track....Something is wrong!!!
[Re: 69L78Nova]
#254967
03/18/09 01:21 PM
03/18/09 01:21 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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-2 version : Pri jets = 70, sec jets = 80, Power valve = 6.5, Pri nozzle = .028, sec nozzle = .031. All else the same.
Fastest 300
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Re: Just returned from the track....Something is wrong!!!
[Re: Crizila]
#254968
03/18/09 01:26 PM
03/18/09 01:26 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Put the carb back to stock specs and don't screw with it for now.
Fastest 300
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Re: Just returned from the track....Something is wrong!
[Re: 69L78Nova]
#254969
03/18/09 01:28 PM
03/18/09 01:28 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
No, just rebuilt it. Has 74/77 jets in it. I have a 61-99 jet kit, but I guess with the low vacuum it would be hard to tune correctly
I'd go up on the jets...have you tweaked it w/ a vacuum gauge? and yeah you need to get the right PV in to tune it. I bet if you could get the vacuum up, went with a 4.0 PV and upped you jets you'd pick up on the low end, thus netting better et and w/ the extra jetting in the secondaries pick up a little up top as well. Anybody know how low PV's go? I think the lowest I've ever used was 4.5
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Re: Just returned from the track....Something is wrong!
[Re: Mr.Yuck]
#254971
03/18/09 01:42 PM
03/18/09 01:42 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Don't cover up existing problems by screwing with the carb. It will just compound your problems. I doubt you washed down the walls so bad that you cashed the rings. I would do a leak down test though. I'm sure one of the guys running a 5/16" fuel line on their drag machine has one lying around you could borrow.  Assume you are running a PCV system to keep the crankcase in negative pressure at idle?? Is it working? The idle rpm should drop about 50rpm when you plug it off. How does the breather vent hose look on the inside? Should be dry. If its dripping with oil thats a sign of excessive blow by. So is lots of oil leaks??
Fastest 300
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Re: Just returned from the track....Something is wrong!
[Re: Crizila]
#254972
03/18/09 02:25 PM
03/18/09 02:25 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Dispite everyones "expert" input on this thread, try to stay focused on your known problems - Can't get cam timing marks to line up ( a biggie and should be #1 on your adgenda to fix.), low cranking compression - which could quite possibly go away once you get the cam timed properly. Forget trying to degree in the cam for now. You can't do it until you get the marks to line up anyway.
Fastest 300
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Re: Just returned from the track....Something is wrong!!!
[Re: 69L78Nova]
#254973
03/18/09 02:34 PM
03/18/09 02:34 PM
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Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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Just to let you know we are just going by the info you have given us and assuming a lot. At least I am.
Because there is no video of your run for us to critique, we are assuming you can launch and shift. 1/2 a second or more can be made up with a good launch and proper shifting. Yes, not all of us are as quick as Ronnie Sox when it comes to shifting.
I do think you should not have such a low vacuum though and do think getting that back will help ET somewhat. The low cranking compression is also something that's not the norm.
You never mention if the car ran better in the past.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: Just returned from the track....Something is wrong!
[Re: Crizila]
#254974
03/18/09 02:40 PM
03/18/09 02:40 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Dispite everyones "expert" input on this thread, try to stay focused on your known problems
You're right. Too many cooks in the kitchen. I'll bow out since I got in late. I'll just be an observer from now on as I'd like to see how it turns out.
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Re: Just returned from the track....Something is wrong!!!
[Re: Crizila]
#254976
03/18/09 05:52 PM
03/18/09 05:52 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Quote:
Incorrect moper. A cam with a different base circle diameter will change the valve train geometry. So will head milling, blocking decking, head gasket thickness, etc. Running too small a fuel line won't affect it though.
I'd like to hear how you figure that.
I understand things differently... let me try and explain what I know believe to be true. Rocker geometry is the relationship of the fulcrum point, or pivot point which is the centerline of the shaft in a Mopar, to the arc created as the rocker tip travels. On a factory shaft system, the only variables are the saddles, which are tough to but not impossible to be messed up... or the valve seat depth and the resulting effective lengthening of the valve stem and tip, which affects where the tip of the valve is at rest (closed). You can take a stock head and block, mill .300", .050", or 3" off them, and you will have only made the effective length of the pushrods shorter. You have not changed anything in the rocker and valve tip relationship. The sweep will always be unchanged by any of those. A smaller base circle cam, milled deck, or milled heads or lifter design directly affect the pushrod length you need. The single biggest issue with geometry problems an mopars is bad valve jobs where the seats are sunk making the valves too long unless the stems are trimmed a like amount to reset the height. A good shop, with a modern seat milling center, makes that as easy as reading the indicator when the seats are cut.
edit: I would second the leakdown. And degree the cam...
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Just returned from the track....Something is wrong!
[Re: moper]
#254977
03/18/09 06:37 PM
03/18/09 06:37 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Quote:
Incorrect moper. A cam with a different base circle diameter will change the valve train geometry. So will head milling, blocking decking, head gasket thickness, etc.
I'd like to hear how you figure that.
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Re: Just returned from the track....Something is wrong!
[Re: 64Post]
#254978
03/18/09 06:55 PM
03/18/09 06:55 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
Quote:
Incorrect moper. A cam with a different base circle diameter will change the valve train geometry. So will head milling, blocking decking, head gasket thickness, etc.
I'd like to hear how you figure that.
I think the main isue w. milling, cutting, decking is you might need to shim the shafts or use adjustable push rods. I had a set of 915's cut way back when and used a set of thin head gaskets (and got the intake cut to match) I was gonna use adjustable push rods but they was $$$$ so I shimmed the shafts and it ran killer. built 383 spun it to 7200 every weekend. zippy problems.
I think (and I'm just a weekend warrior) he has 2 issues, I do think his carb needs a good tuning and double check that cam and t-chain. Since you got the front of the motor apart it should be pretty easy. Like I said way back 106 is about right, your et is off and your 60, 100 foot is off. You'll get it right. Try this..remove the rocker shafts and do a compression test. If you have 140 again you know you have a ring problem or just low compression, in that case get a different cam, if it goes up to 170 or so you know you have a cam installation problem. Good luck, I hate chaseing problems.
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Re: Just returned from the track....Something is wrong!
[Re: 69L78Nova]
#254980
03/18/09 08:05 PM
03/18/09 08:05 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Well, I just installed a new ting set. Picked up an Edelbrock double roller. Installed it dot-to-dot straight up and did a compression test. Averaging between 190-195 across all 8 cylinders counting 5 hits on the gauge as before. Very interesting. Im gonna go ahead and try to degree the cam. The only difference between compression tests other than the readings was now the motor is ice cold, whereas before, it was a little warm...nowhere near operating temperature.
 At least you were turning wrenches instead of BSing on the internet all day. I'd love to know where the cam was before -- I'm guessing about 20* late. Oh well... hey, don't forget to upsize the fuel line to 7/8 ".
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