351W valve springs - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 06-05-06, 07:41 PM Thread Starter
All crossed up
 
DOG20L's Avatar
 
Join Date: Jan 2005
Location: Camden, NSW, Australia
Age: 37
Posts: 45
351W valve springs

Hi everyone, been a while since my last post. Anyway, I have a TC Corty with a 351W w/ Edelbrock Performer RPM package e.g. heads, cam and manifold. I have mixed it up a bit by using a Demon 750 DP instead of the Edelbrock carb and Mallory ignition of the same specs as what Edelbrock recomends. The package is supposed to make max power at 6000rpm, ever since the build I have noticed a slight "crackle" at about 5500rpm, so i havn't been able to rev it any harder. I thought it was fuel delivery related so i fitted the biggest mech pump i could find. It is still pulling hard up to that point but makes the noise at 5500rpm. Finally went to a dyno day the other day, it got to 5500rpm and made the noise, the operator backed off (thanks to the guy, has good mechanical sympathy). He recons it is valve bouncing , but only on the left bank. This surprised me because the heads came from Edelbrock with the valves and springs installed. Anyone exerienced anyhting like this?

DOG20L is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 06-06-06, 04:41 PM
Registered User
 
Freshmeat's Avatar
 
Join Date: Sep 2005
Location: Geismar, LA, USA
Age: 33
Posts: 833
Re: 351W valve springs

What cam are you using? If it's showing more lift than the springs are rated for, you'll definitely have issues.
Freshmeat is offline  
post #3 of 6 (permalink) Old 06-06-06, 04:45 PM Thread Starter
All crossed up
 
DOG20L's Avatar
 
Join Date: Jan 2005
Location: Camden, NSW, Australia
Age: 37
Posts: 45
Re: 351W valve springs

Don't remember the cam specs off the top of my head but it is the one Edelbrock recomends for the package.
DOG20L is offline  
post #4 of 6 (permalink) Old 06-12-06, 09:19 AM
Registered User
 
Join Date: Jun 2006
Posts: 7
Re: 351W valve springs

did you check the installed height?
sbftech.com is offline  
post #5 of 6 (permalink) Old 07-16-06, 08:03 AM
Registered User
 
Join Date: Jun 2006
Posts: 18
Re: 351W valve springs

Yep, sounds like your floating the valves. double check with edel about the cam specs. You might take the springs in to the shop and have them check the seat pressure. Above all, just make sure that the springs dont bind at full lift, that's the name of the game.
diggerauditor is offline  
post #6 of 6 (permalink) Old 07-16-06, 04:55 PM Thread Starter
All crossed up
 
DOG20L's Avatar
 
Join Date: Jan 2005
Location: Camden, NSW, Australia
Age: 37
Posts: 45
Re: 351W valve springs

Thanks guys. I didn't check the installed height, seems very stupid in hindsight. Could have been much worse! I just assumed that if I used all Edelbrock stuff everything would be sweet.
I have learnt from my mistakes.
DOG20L is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Windsor Tech


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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