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Re: Just returned from the track....Something is wrong!
[Re: 70AARcuda]
#254941
03/18/09 12:31 AM
03/18/09 12:31 AM
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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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Sorry, not aware you could do that. I'll have to do a search on how you guys do preload then. I've always check the geometry, adjusted the pushrod length accordingly, and used adjustable rockers to set preload.
Last edited by HealthServices; 03/18/09 12:36 AM.
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: HealthServices]
#254942
03/18/09 12:31 AM
03/18/09 12:31 AM
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Joined: Apr 2007
Posts: 2,327
Glendale, AZ
69L78Nova
OP
Banned. Forever.
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OP
Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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Quote:
So you checked preload and adjusted it by using shims?
No. I just bolted them down.
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Re: Just returned from the track....Something is wrong!
[Re: HealthServices]
#254943
03/18/09 12:41 AM
03/18/09 12:41 AM
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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:
I've always check the geometry, adjusted the pushrod length accordingly, and used adjustable rockers to set preload.
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Re: Just returned from the track....Something is wrong!
[Re: 69L78Nova]
#254944
03/18/09 12:53 AM
03/18/09 12:53 AM
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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:
Im working on getting a degree wheel. But heres another "long shot". Edelbrock recommends the use of adjusteble rocker arms when using cams with a greater-than-stock lift. There has to be a reason for this. Since Im running the MP509, is it possible the rocker stands themselves might not be machined at the same height as say a stock cast iron head, therefore causing the valves to "hang open"? Much like a Chevy with the rockers adjusted too tight? I do have experience with that scenario and the effect is great. I should have a degree wheel tomorrow and Ill take a crack at it.
But who here thinks I could benefit from an adjustable rocker setup? Id like to rule that out as a possibility as well. I appreciate all of the replies. Its all very interesting. I just hope I can get to the bottom of this.
Might be a "short shot" after all. Don't touch anything yet. Start by pulling the rocker covers. There are several ways to check for this issue. Compressed air into the cylinder via the spark plug hole being the easiest. Bring no. 1 up to TDC on the compression stroke and hit it with 100 psi of air. If it's leaking you'll hear it.
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Re: Just returned from the track....Something is wrong!
[Re: 69L78Nova]
#254946
03/18/09 08:29 AM
03/18/09 08:29 AM
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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:
The engine wouldnt have to be running for an accurate test? I mean so the lifters would be completely pumped up
your lifters should still be pumped up, they don't go flat when you shut the engine off. The forced air method is a great way to tell if everything is right. This is how I learned I burned up #3 in a S/C'd 440. You'll here the air blowing into the block if you have a leak. Have you puled the cover and slowly turned the engine over watching each valve open and close? I mean the car is running, you did pull 106mph, which isn't bad for your set-up.
How is your carb set-up?
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Re: Just returned from the track....Something is wrong!
[Re: Mr.Yuck]
#254947
03/18/09 09:52 AM
03/18/09 09:52 AM
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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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Rocker shaft stands will be the same height for both Eddy and cast iron heads. Yes, you can use the stock non-adjustable rockers and push rods with your cam, but the rocker arm geometry will be slightly screwed up. Shiming the shafts might fix it. As long as you have some lifter perload without bottoming the lifters out ( highly unlikely you will do that ) things will work. Also highly unlikely you have burned / bent valves when you ran 106 - and the compression is the same ( although low )accross the board. Used cam::: Did you verify it is what the seller said it is? Did you check part numbers / mike the lobes, or at least eye-ball them and the lifters when you changed manifolds?
Fastest 300
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Re: Just returned from the track....Something is wrong!
[Re: 69L78Nova]
#254949
03/18/09 10:42 AM
03/18/09 10:42 AM
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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:
The rocker arm geometry will be screwed up in what way? I did verify it was the .509 when I got the cam. I did mic the lobes
yeah I know plenty of folks running e-haeds and using stock valve train....
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Re: Just returned from the track....Something is wrong!
[Re: 69L78Nova]
#254951
03/18/09 10:54 AM
03/18/09 10:54 AM
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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:
Ok, but how will the geometry be screwed up?
I don't know how it would be. It's not like you have switched to those "chevy style" heads.
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Re: Just returned from the track....Something is wrong!!!
[Re: 69L78Nova]
#254952
03/18/09 11:17 AM
03/18/09 11:17 AM
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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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If you are not sure where you are at with your carb, give me the list number on the choke tower ( probably 4779-something ) and I will be happy to give you the particulars on it - as it came from Holley. This would be a good starting point for you and eliminate the carb as your problem.
Fastest 300
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Re: Just returned from the track....Something is wrong!!!
[Re: Crizila]
#254955
03/18/09 12:04 PM
03/18/09 12:04 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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On shaft rockers, the only thing that will affect geometry is the valve job. Factory Edelbrock valve jobs are.. less than satisfactory for my taste. I have the heads corrected and they usually find issues. Cri - not only do I have fuel presure gages, I gots the Snap On top of the line diagnostic ones AND know how to read them  . Not the questionable Auto Meter ones. I do so when I set up fuel ssytems, tune NOS systems, have a no start on EFI, or when I believe there is a fuel problem. I dont beleive there is in this case.
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: 69L78Nova]
#254956
03/18/09 12:06 PM
03/18/09 12:06 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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If it's a 4779 with no numbers after that it's the first version of that carb - they have since made a -1,-2,-3,-4. That don't make your carb bad though. Specs: Mod. 4150, 750CFM, pri jets = 75, sec jets = 76, 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. ), pri discharge nozzle = .025, sec discharge nozzle = .032, square carb with all 4 holes @ 1 11/16" dia. Thatil be $5!
Fastest 300
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Re: Just returned from the track....Something is wrong!!!
[Re: moper]
#254959
03/18/09 12:24 PM
03/18/09 12:24 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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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.
Fastest 300
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Re: Just returned from the track....Something is wrong!!!
[Re: 69L78Nova]
#254960
03/18/09 12:27 PM
03/18/09 12:27 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:
Whoops! Mine is a -2
-2 has 70-80 and 6.5PV stock...still dumping gas. Try and get 6-7lbs of vacuum if you can. Then you might could run a 4.5PV. I'd also go up on the jets too. I ran 74-82's in a mild 340 w/ a 750DP
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