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08-13-2003, 07:58 AM
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CC Member
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Join Date: May 2003
Posts: 1,313
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Not Ranked
Haven't heard much from Brent, don't suppose that new internet worm is making the cobra problem look trivial?
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08-13-2003, 08:19 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
It could be worse
Brent,
One of the girls sent me this while I was going through all my troubles with my engine. I didn't solve anything but I thought it was kind of cool:
http://www.qnet.com/~pontius/smile/s...p_1%5B1%5D.htm
>
> Bye and have a nice day!
>
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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08-13-2003, 10:40 AM
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CC Member
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Join Date: Oct 2000
Location: Lake Stevens,
WA
Cobra Make, Engine:
Posts: 995
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Not Ranked
Brent, you really deserve better than this. Maybe God is testing you. Yeah, that's it, God has a divine mission and He needs a really patient man. Just think, future generations might use the phrase, "He has the patience of Brent".
....or maybe it's just the big crap cake thing.
Rich
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08-13-2003, 11:09 AM
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Average Guy
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Join Date: Sep 2002
Location: Rushville,
IN
Cobra Make, Engine: red Shell Valley, white stripes
Posts: 578
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Not Ranked
More bad luck? Hard to believe. What you need is a well-sorted car with a history of reliability. The process of getting your car to this point has been really challenging. Your friends are with you though. Stay strong.
I once saw a large oval air cleaner that actually sat on top of the plug wire where it snapped into the distributor cap. Eventually it rubbed the wire enough that the spark began diverting to the air cleaner base rather than travelling to the plug. Sometimes really hokey stuff can happen on these cars. You may find the solution is simple. Good luck.
__________________
When I said I wanted to be somebody, I probably should have been more specific...
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08-13-2003, 02:57 PM
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CC Member
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Join Date: Nov 1999
Location: Pentwater,
Mi
Cobra Make, Engine: Professional Cobra & Streetrod Builder
Posts: 5,352
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Not Ranked
Brent...............
We're still standing by the phone! 
DV...It will get better! |
08-13-2003, 06:30 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,161
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Not Ranked
Broken pushrod on #4 cyl. Pushrod cup broken just like the last engine, although this pushrod got mangled hitting the underside of the rocker arm I would presume. Only one common component (different builder).....Harland sharp roller rockers. Bought end stands and spacers thinking that could have been part of the problem with the last engine (plenty of other issues with that build), but I guess not.
Engine builder is working with me to determine the problem and solution.
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08-13-2003, 06:49 PM
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CC Member
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Join Date: Jan 2003
Location: Atlanta,
GA
Cobra Make, Engine: CAV GT40 with 331 KC
Posts: 2,187
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Not Ranked
Brent-
Just a guess here, but I would sure check the pushrod to intake manifold clearance!
Pat
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08-13-2003, 06:55 PM
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CC Member
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Join Date: May 2003
Posts: 1,313
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Not Ranked
Brent,
If you would, describe your valve train,
roller cam?
roller rockers?
hydraulic roller tappets?
chrome moly push rods? (I guess not, they don't bend, its the engine that ends up bending...)  |
08-13-2003, 08:35 PM
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CC Member
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Join Date: Mar 1999
Location: TACOMA,
WA
Cobra Make, Engine: Everett Morrision FE 427 so 2-4s
Posts: 2,008
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Not Ranked
Have you checked your valve rocker geometry?Are the adjustment screws really backed up so the ball end is close to the arm?Are the rocker shaft stands the right height (too tall) so the cup on the pushrod isn't getting too close to the arm on full lift?A change in height will reguire a change in pushrod length.Stiil no big problem.Customs are available from an outfit in Oregon.
__________________
Mike H
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08-13-2003, 11:26 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,161
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Not Ranked
Pat, clearances for the manifold seem pretty good. The holes have been drilled/ground pretty large, but I'll check.
Dave, Solid cam/lifters, with only about .540 lift., Harland Sharp roller rockers, hardened shafts, Precision billet supports & end stands, Precision billet spacers (all rockers were centered above the valve tip), stock type 427 pushrods.
Michael, I don't know what a proper geometry is. The ball is far out (shorter/stock length push rod), but the stands are stock height I think.
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08-14-2003, 04:31 AM
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CC Member
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Join Date: May 2003
Posts: 1,313
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Not Ranked
Brent,
There are hardened push rods (about $40 a set), and then there are chrome moly push rods (about $160 a set). You need the chrome moly push rods
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08-14-2003, 11:26 AM
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Senior Club Cobra Member
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Join Date: Aug 2000
Location: Mckinney,
TX
Cobra Make, Engine: Lone Star Classics #89 Keith Craft Genesis 427 so, stroked to 482, 649 hp. Sabre GT 40 #16 351W stroked to 408, 527hp, TWM stack injection, Fast XFI, G50/50.
Posts: 537
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Not Ranked
Hey Brent,
I had a similar problem where I kept breaking push rods and it turned out to be a tolerance problem with the intake manifold. I also noticed scratches on the under side of the rocker. When everything was put back together the adjustment tip on the rockers broke. Also all the needle berings in the lifter were gone and on one lifter the side wall was cracked.
Be careful my builder left the bad lifter in. I've got a story better than yours. ... Make sure the builder checks the lifters and the rocker adjustment stud.
John
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08-14-2003, 02:41 PM
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CC Member
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Join Date: Nov 1999
Location: Pentwater,
Mi
Cobra Make, Engine: Professional Cobra & Streetrod Builder
Posts: 5,352
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Not Ranked
Brent,
MOST pushrods only fail from geometry mis-alignment. This HAS to be checked before anything!
JEGS, www.jegs.com has what you need to check the proper length.
[img] http://www.jegs.com/photos/270997212.jpg[/img]
Part number is 270-99726
I'm guessing at your motor, so double check my part numbers!
Once you KNOW the proper length, then maybe a new set.
Good luck...
DV |
08-14-2003, 03:07 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Finding a good FE builder is hard to do. Good luck. Let us know if we can help.
David  |
08-14-2003, 03:56 PM
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CC Member
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Join Date: Jan 2003
Location: Atlanta,
GA
Cobra Make, Engine: CAV GT40 with 331 KC
Posts: 2,187
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Not Ranked
DV-
Brent needs the cup and ball style pushrod checker I believe.
I have had no luck finding one for sale - had to make my own.
Pat
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08-14-2003, 04:52 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,161
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Not Ranked
I trust the builder, and he specifically indicated that the geometry was good before I left the shop with the engine. They are very thorough (and do LOTS of FE's), so I'm not jumping to conclusions yet.
At minimum, I will be getting top line pushrods, and I'll be going with a different rocker setup just to be sure. Hoping nothing else is screwed up.
By the way fellas, thanks for the support and help. If you have ideas, don't hesitate to lay it on me. DV & David, thank you for offers of help. I hope it doesn't end up being a problem I need your help for, but I appreciate your offers all the same!
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08-14-2003, 07:28 PM
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CC Member
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Join Date: Mar 1999
Location: TACOMA,
WA
Cobra Make, Engine: Everett Morrision FE 427 so 2-4s
Posts: 2,008
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Not Ranked
What I was getting at is ,When the cam lobe lifts to the extreme- does the cup of the pushrod get close to the under side of the rocker arm itself?
also when assembleing you cant have enough hands and eyes. Pushrods do getout of place and the tightening begins and damage happens. Pushrods get droped and damage goes unnoticed.Like that rod may have had a fractured cup at the time of assembly and it broke completely later while being driven.
__________________
Mike H
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08-14-2003, 10:07 PM
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Subsistance du serpent
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Join Date: May 1999
Location: DFW, Texas,
TX
Cobra Make, Engine:
Posts: 1,120
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Not Ranked
Had a similar problem.
When I switched from adjustable rockers to CompCams roller rockers, I had to change pushrods (shorten them) to keep them from hitting the bottom of the rocker arms. George Anderson at Gessford sent me 3 or 4 pushrods until I found the right size. I got them from "Smith Brothers" or something similar to that name - They are in Oregon I believe.
A few thoughts..
If the pushrod cup is too wide or the pushrod is too long, it will put a "smile" indentation under the bottom of the rockers. This can either cause the rod break the rocker arm, bend or jump off the adjuster.
If they are too short, the adjust ball comes out too far and can break off.
Beyond that, faulty lifter? Rod hole alignment in the manifold? Rocker arm seized?
Good luck! Hope it is minor!
__________________
James
A few ERAs, SPFs, Shelbys, Kirkhams...
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08-15-2003, 01:16 PM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,161
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Not Ranked
I'll have to check the clearances this weekend. Getting the sucker towed home from my work parking garage tonight.
Things I plan to do:
1. Check clearance between cup and rocker at various points of rocker travel.
2. Leak down test (hoping intake valve didn't get buggered up).
3. Probably order a set of Precision Oil Pumps rocker arms which I got the shaft, spacers, and supports from. They use a ball-ball pushrod which will help if there were clearance problems.
4. Order top line push rods.
5. Pulling manifold to look for any debris.
During this process, speaking with my builder who I presume will be taking care of me (although hopefully the above stuff I'll just be able to get done myself and get back on the road soon unless other bad things happened).
If you've got more suggestions, bring them on. |
08-15-2003, 01:42 PM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
Brent,
You do not need any more advice, there is plenty here.
You need Jamo to provide the clearest observation of all events and their relative significance to you.
Then, as you laugh a little, call "1 800 $uck this engine" and order a plain Jane 351.
Just my $0.02
__________________
I'm a writer, feed the artist and buy a book.
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