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DNF'd at the Silver State Classic NOW WITH VIDEO!
#1439891
05/21/13 03:29 PM
05/21/13 03:29 PM
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Joined: Jan 2003
Posts: 3,031
Erda, UT
67Charger
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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Made it about 34 miles in the Silver state when "BRAP BRAP BRAP BRAP...." happened at 4700 rpm doing about 137. It sounded like I popped a spark plug, but it was too loud and it was still firing. It later guessed a broken valve spring on an intake, allowing the valve to drop, hit the piston and get jammed up in the guide, allowing the combustion to backfire through the manifold. Wrong again. It is time to retire the Crane Golds. The adjuster was there and set correctly, but was loose. The rocker wash pushed off the shaft high enough that the lift from the pushrod was no longer hitting it. I run about .640 lift and 400 - 430# open spring pressure on these 1.6's Video of the end of my run... NORC 2013
Last edited by 67Charger; 05/24/13 04:01 AM.
11.33 @ 118.46 on motor
10.75 @ 125.35 w/ a little spray
Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race
Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: DNF'd at the Silver State Classic
[Re: 67Charger]
#1439892
05/21/13 04:00 PM
05/21/13 04:00 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Made it about 34 miles in the Silver state when "BRAP BRAP BRAP BRAP...." happened at 4700 rpm doing about 137.
It sounded like I pospped a spark plug, but it was too loudm it was still firing. It later guessed a broken valve spring on an intake, allowing the valve to drop, hit the piston and get jammed up in the guide, allowing the combustion to backfire through the manifold. Wrong. It is time to retire the Crane Golds. The adjuster was there and set correctly, but was loose.
I run about .640 lift and 400 - 430# open spring pressure on these 1.6's
Sorry about your troubles.
1.5s will last much longer, be much more stable and oil better, less chance of burning up the adjuster. Don't blame the rockers. Blame the adjusters and the ratio,imo.
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Re: DNF'd at the Silver State Classic
[Re: Challenger 1]
#1439893
05/21/13 05:20 PM
05/21/13 05:20 PM
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Joined: Jan 2003
Posts: 3,031
Erda, UT
67Charger
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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Those are Smith Brothers adjusters and pushrods, and both are still in perfect condition. The adjuster had not backed out at all. The threads were beaten in the rocker, allowing me to twist the screw out by hand. The point of failure was overheat at the shaft to the point of weakening the aluminum and allowing the bottom to stretch apart and fracture. The rocker was so hot it was burning the oil spray. Notice the adjacent rockers are clean. I would say looks as if it ingested some debris and blocked the oil passage. I'll know more when I get it apart tonight. The discoloration on the end of the pushrod is burnt oil, not metal bluing.
11.33 @ 118.46 on motor
10.75 @ 125.35 w/ a little spray
Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race
Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: DNF'd at the Silver State Classic
[Re: Challenger 1]
#1439895
05/21/13 05:50 PM
05/21/13 05:50 PM
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Joined: Jan 2003
Posts: 75,042
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,042
U.S.S.A.
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Quote:
Quote:
Made it about 34 miles in the Silver state when "BRAP BRAP BRAP BRAP...." happened at 4700 rpm doing about 137.
It sounded like I pospped a spark plug, but it was too loudm it was still firing. It later guessed a broken valve spring on an intake, allowing the valve to drop, hit the piston and get jammed up in the guide, allowing the combustion to backfire through the manifold. Wrong. It is time to retire the Crane Golds. The adjuster was there and set correctly, but was loose.
I run about .640 lift and 400 - 430# open spring pressure on these 1.6's
Sorry about your troubles.
1.5s will last much longer, be much more stable and oil better, less chance of burning up the adjuster. Don't blame the rockers. Blame the adjusters and the ratio,imo.
I don't know, I don't trust unbushed alum rockers on steel.
What are those rockers rated for for open spring pressure ?
OP are your shafts banana groove ? If it was getting hot enough to burn up the oil it was on it's way to siezing on the shaft , I bet it's not the only one you will find with some damage. How close is that one to the oil hole that feeds the shaft?
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Re: DNF'd at the Silver State Classic
[Re: JohnRR]
#1439896
05/21/13 06:45 PM
05/21/13 06:45 PM
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Joined: Feb 2005
Posts: 20,180
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,180
PA.
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There are lots things that could cause that but without more info its hard to say for sure.
Are they Edelbrock heads? If so new or used
Crane shafts have a right and a wrong way for install for proper oiling. Harlan Sharp can go on either way.
Like asked above were the shafts banana grooved?
If so were they done right. Some guys make the grooves to long and the oil sneaks out past the rocker.
Did you limit the oil going to the head. Some guys do.
Were the rockers shimmed right side to side?
Were the rockers checked for proper sweep on the valve tip.
How many runs did the rockers have on them?
I personally never use those springs as they do not limit rocker placement properly. I usually take 3-4 hours setting up rockers the right way.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: DNF'd at the Silver State Classic
[Re: pittsburghracer]
#1439897
05/21/13 08:42 PM
05/21/13 08:42 PM
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Joined: Jan 2003
Posts: 3,031
Erda, UT
67Charger
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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Your answers, in order:
Are they Edelbrock heads? -Yes, RPM's
If so new or used? -I purchased them new, 6 years on them now.
Crane shafts have a right and a wrong way for install for proper oiling. Harlan Sharp can go on either way. -Definitely on on the correct orientation
Like asked above were the shafts banana grooved? -No
If so were they done right. Some guys make the grooves to long and the oil sneaks out past the rocker. -Again, not grooved
Did you limit the oil going to the head. Some guys do. -No
Were the rockers shimmed right side to side? - springs between them with steel rings for wear protection
Were the rockers checked for proper sweep on the valve tip. -perfectly across the center
How many runs did the rockers have on them? -a few hundred and 1500 miles of standard driving and road racing
I personally never use those springs as they do not limit rocker placement properly. I usually take 3-4 hours setting up rockers the right way.
11.33 @ 118.46 on motor
10.75 @ 125.35 w/ a little spray
Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race
Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: DNF'd at the Silver State Classic
[Re: 67Charger]
#1439900
05/21/13 09:19 PM
05/21/13 09:19 PM
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Joined: Feb 2005
Posts: 20,180
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,180
PA.
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I google search on Crane rockers and there instructions said the big block rockers came with springs and their small block rockers used the aluminum spacers. Not sure way but maybe to stabilize at higher rpm's. Hard to tell if yours are big block or small block from that picture but here are their small block instructions. http://www.cranecams.com/uploads/instructions/198e_.pdf
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: DNF'd at the Silver State Classic
[Re: pittsburghracer]
#1439907
05/22/13 10:13 AM
05/22/13 10:13 AM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
master
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master
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
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Quote:
Quote:
Oh, and I agree with pittspukeracer  on using spacers instead of springs between the rockers 
Pittspukeracer.??????????????????? 
Well, being from Cleveland my computer automatically corrects the spelling of your city
Nothing personal
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Re: DNF'd at the Silver State Classic
[Re: Challenger 1]
#1439909
05/22/13 11:05 AM
05/22/13 11:05 AM
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Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
dodgeboy11
super stock
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super stock
Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
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Quote:
Quote:
Made it about 34 miles in the Silver state when "BRAP BRAP BRAP BRAP...." happened at 4700 rpm doing about 137.
It sounded like I pospped a spark plug, but it was too loudm it was still firing. It later guessed a broken valve spring on an intake, allowing the valve to drop, hit the piston and get jammed up in the guide, allowing the combustion to backfire through the manifold. Wrong. It is time to retire the Crane Golds. The adjuster was there and set correctly, but was loose.
I run about .640 lift and 400 - 430# open spring pressure on these 1.6's
Sorry about your troubles.
1.5s will last much longer, be much more stable and oil better, less chance of burning up the adjuster. Don't blame the rockers. Blame the adjusters and the ratio,imo.
Nascar is running 2.2 ratio rockers at over 9k rpm. Has nothing to do with rocker ratio and everything to do with cam lobe, proper setup and quality parts. Crane golds are not very good rockers in my opinion, and that's why I think it's a good idea to save up for T&D or Jesel rockers. Again, just my opinion.
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Re: DNF'd at the Silver State Classic
[Re: pittsburghracer]
#1439910
05/22/13 11:08 AM
05/22/13 11:08 AM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
master
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master
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
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Quote:
Quote:
Quote:
Quote:
Oh, and I agree with pittspukeracer on using spacers instead of springs between the rockers
Pittspukeracer.???????????????????
Well, being from Cleveland my computer automatically corrects the spelling of your city
Nothing personal
No problem and I understand. I have a different problem with my computer. Picture over-load. It spits them out all by itself. 
 I like that
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