Looking for Help! - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old Mar 12th, 10, 07:39 PM Thread Starter
Senior Tech
Tony
 
Join Date: Dec 2000
Location: Willow Park, Texas
Posts: 1,030
Question Looking for Help!

Pulled these lifters from a buddies Pontiac. Motor has approx 200 miles since build. Broken in with good oil and zddp additive. Run at varying RPM for 30 minutes. I have never seen a cam take so much off the bottom of a lifter. Cam is lobe doesn't show much damage other than chipping the sides of the lobes. I would have expected it to be completely rounded off to have removed that much material from the lifter.
Anybody ever seen this before? Know what the cause could be?

The motor is a stroked 496 Pontiac with Edelbrock RPM heads and a pretty big Hydraulic Flat tappet cam.


:

Tony:
67 RS Clone, 388 SBC/Keisler TKO 600/12 bolt, 3.90 gear w/posi and a 250 shot of N2O for fun. See my progress at: password is camaro


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
idoxlr8 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old Mar 12th, 10, 07:44 PM
Gold Lifetime Member
Dave C
 
Join Date: Jan 2007
Location: maryland
Posts: 5,495
Send a message via AIM to Pro-Street69Camaro468 Send a message via Yahoo to Pro-Street69Camaro468
Re: Looking for Help!

Seams like the cam would have to be wiped can you see the lobes on the cam how do they look.

PRO.ST69orange

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Pro-Street69Camaro468 is offline  
post #3 of 10 (permalink) Old Mar 12th, 10, 07:54 PM
Moderator
Bill
 
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,290
Re: Looking for Help!

Ouch .... that is by far the worst one I have seen yet Now he has all that metal to clean out of the engine The cam has to be done with for sure. Wonder if the spring combination on the heads is wrong, or something else in a bind in the valve train ? Edelbrocks heads usually do not come with a lot of valve spring though. Just looked at Edelbrocks site and it looks like they are good for .575 lift. How big was his cam ? Also, its hard to tell for sure but it looks like the springs are double springs. They have 130lbs seat pressure, thats a pretty good spring. Did he take the inners out for break in time ? Almost every cam manufacturer I know of tells you to remove the inner springs during break in.

Those are the types of questions I would be asking.

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BillK is offline  
 
post #4 of 10 (permalink) Old Mar 12th, 10, 08:05 PM
Senior Tech
Gary
 
Join Date: Mar 2009
Location: Auburn, CA
Posts: 439
Re: Looking for Help!

Ouch....I feel bad for your buddy. That's some serious wear! I recently broke-in my cam and so far so good. Lets see...good oil and additive, never let it idle, removed inner spring, EOIC valve adjustment, changed oil after break-in and continued to add supplement to oil. Goodluck!

Gary
Gar's67 is offline  
post #5 of 10 (permalink) Old Mar 15th, 10, 09:54 AM Thread Starter
Senior Tech
Tony
 
Join Date: Dec 2000
Location: Willow Park, Texas
Posts: 1,030
Re: Looking for Help!

Bill,

The cam lobe is worn but I have seen worse lobes(completely rounded). This one is no where close to that. Can the lifter/cam machine that much metal off of the bottom of the lifter? I am wondering if he got a couple of wrong lifters for this cam, they all came with the kit.
He does have Harland Sharp roller rockers, the springs that came with the cam kit where checked/set/installed on the heads. The springs a singles with just a flat dampner inside. He also checked valve to piston clearance in the build up.

I have never seen a lifter loose 1/8th of an inch before and am trying to figure out what happened to cause it.

Thanks

Tony:
67 RS Clone, 388 SBC/Keisler TKO 600/12 bolt, 3.90 gear w/posi and a 250 shot of N2O for fun. See my progress at: password is camaro


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
idoxlr8 is offline  
post #6 of 10 (permalink) Old Mar 15th, 10, 10:21 AM
Moderator
Bill
 
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,290
Re: Looking for Help!

Tony,
Post some details and part numbers of the cam and springs. Pontiacs normally use a very short valve spring, if something else was used it might be coil binding at full lift ? It is very possible for the cam to wear that much off the bottom of the lifter

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BillK is offline  
post #7 of 10 (permalink) Old Mar 23rd, 10, 12:41 PM Thread Starter
Senior Tech
Tony
 
Join Date: Dec 2000
Location: Willow Park, Texas
Posts: 1,030
Re: Looking for Help!

Bill,
Sorry for the Delay, It took him a few days to get back out to his shop (garage).

The cam that he had installed is a Lunati Voodoo cam grind number VD-PV8-276,
specs are .504I/.527E lift,
233I/241E duration @.050.
He did not change the springs out from the Edelbrock ones (Don't know why he has the Lunati ones for this cam).

Next question is how do the Edelbrock springs compare to the Lunati ones for this cam? (Lunati spring p/n 73949LUN, Spring Type:
Dual w/damper, Outside Diameter: 1.440 in.
Seat Load: 120 lbs @ 1.650 in.
Open Load: 265 lbs @ 1.250 in.
Coil Bind: 0.950 in.
Spring Rate: 363 lbs/in.)

Bigger Question:
He wants to switch to this Comp Cam HydRoller: XR288HR
.520I/.540E lift
236I/242E duration @ .050
And it calls for these springs
p/n: 995-16
O.D. of Outer Dia. 1, 1.437
I.D. of Outer Dia. 2, 1.073
I.D. of Outer Dia. 3, .697
Seat Load 115 @ 1.700
Open Load [email protected] 1.150
Coil Bind 1.020
Rate (Lbs./In.) 402

Will the Edelbrock springs work or should he change them out?

Thanks for your patience and help!

Tony:
67 RS Clone, 388 SBC/Keisler TKO 600/12 bolt, 3.90 gear w/posi and a 250 shot of N2O for fun. See my progress at: password is camaro


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
idoxlr8 is offline  
post #8 of 10 (permalink) Old Mar 23rd, 10, 03:11 PM
Gold Lifetime Member
John
 
Join Date: Dec 2008
Location: Louisville, Ky.
Posts: 3,403
Re: Looking for Help!

Chance the springs.
john68 is offline  
post #9 of 10 (permalink) Old Mar 23rd, 10, 05:57 PM
Moderator
Bill
 
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,290
Re: Looking for Help!

Tony,
The Edelbrock springs appear to be a little more spring than the Lunati ones, but the main thing is the fact that they are a double spring and the inners should have been removed for breakin. As far as switching to the hydraulic roller goes, what you really need to do is pull the heads and have the spring setup checked before you order anything. You really need to know exactly what the existing spring pressures and installed hgts are first. Hydraulic rollers are a lot more forgiving than a flat tappet cam. You can generally run more closed and open pressures. The lifters are heavier so they usually need more pressure to keep them following the camshaft properly.

The Edelbrock springs might be ok, but what you really need to do is take the heads apart and check them. Also check for retainer to guide clearance etc.

By the way, I dont think you will be able to use the Comp Springs without changing something. Maybe just retainers or locks with more installed hgt, but once again you just have to check them

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BillK is offline  
post #10 of 10 (permalink) Old Mar 23rd, 10, 07:03 PM Thread Starter
Senior Tech
Tony
 
Join Date: Dec 2000
Location: Willow Park, Texas
Posts: 1,030
Re: Looking for Help!

Thanks Bill,

He is trying to figure out what he wants to do know

Tony:
67 RS Clone, 388 SBC/Keisler TKO 600/12 bolt, 3.90 gear w/posi and a 250 shot of N2O for fun. See my progress at: password is camaro


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
idoxlr8 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome