4.6 PI and aftermarket cams - TCCoA Forums
 
LinkBack Thread Tools
post #1 of 9 (permalink) Old 07-31-2003, 10:18 PM Thread Starter
6th Gear Poster
 
Join Date: Jan 2003
Location: Jacksonville, NC USA
Age: 54
Posts: 627
4.6 PI and aftermarket cams

I was doing a search on eBay, and found a few CompCams that you can see here . Looks like a few cams may be available for our engines. I know you won't gain "as much" with the nasty 94-95 heads, but there should still be a different power curve/more power than stock. Anyone know anything about swapping in any of these cams?

Dan
2008 Nissan 350Z Grand Touring
2010 Ford F150 Lariat
a bunch of motorcycles
(haven't come across my dream 97 Tbird yet)
DanQ is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 07-31-2003, 10:31 PM
4th Gear Poster
 
Join Date: Mar 2003
Location: Jacksonville NC
Age: 41
Posts: 222
Send a message via AIM to Jason
I'm stealing this thread..... First off thats a lot of money for nothing more than a set of cams.....

Secondly... Are the Cam Journals the same size for the Windsor and Romeo's and how abou those in comparison with the new PI heads??? ( cam journal size again )

I would assume that they are probly the same But I don't know thats why I'm asking....

Lots of Stuff, but the important one is a "5-speed" 4.6L V8 (for sale)


2006 Toyota Tundra 4wd (new vehicle), to pull my boat one day when I get a boat
Jason is offline  
post #3 of 9 (permalink) Old 07-31-2003, 11:27 PM
RIP Jake
 
Leland Jacobson's Avatar
 
Join Date: Jul 2002
Location: Homosassa, Fl
Age: 79
Posts: 1,598
I do believe that conventional wisdom has been that ford has come up with a pretty good cam and most "improved " grinds have taken the power up at the cost of practical power band for a streeter, and also vacuum and smoothness issues that an all out racer wouldnt have the same concerns with.... the flow characteristics of the heads has been improved by a lot of "tuners" useing a flow bench and lots of practical experience in porting and polishing the modular heads of all persuasions.... 5 years ago, MM&FF magazine did an article on porting and polishing, and came up with the conclusion that the 2v head was impossible to improve with p&p'ing and in order to do any good at all the material removed would make parts of the head dangerously thin.... How far we have come.... I suggest you send a set of heads to renegade, or Fox lake, or Livernois for a valve job, and P&P'ing and youll have somethingt youll really like, and save money in the long run, 'cause why are they selling those cams on Ebay? LOL
Leland Jacobson is offline  
Sponsored Links
Advertisement
 
post #4 of 9 (permalink) Old 08-01-2003, 04:44 PM
Renegade
 
chadg's Avatar
 
Join Date: Aug 2002
Location: Minnesota
Age: 37
Posts: 529
Cam journals are the same head to head to head.

I'd have to say cam tech has come a long way too. Yes, I've got a loping idle with my ModMax's, but its still 100% streetable, sounds mean as heck, and gives me the great numbers I have.

-Chad
Down for the count
chadg is offline  
post #5 of 9 (permalink) Old 08-01-2003, 06:23 PM
High-Mileage 4.6L Thrasher
Moderator
 
Johnny Langton's Avatar
 
Join Date: Jul 2002
Location: Texas
Posts: 3,232
The OE ford cams haeve ZERO overlap on the intake to exhaust transition,and this has alot to do with emmisions requirements.This also hinders power output signifigantly.
The new Comp Cams grinds have very nice profiles available,and I've seen nothing but good results out of them.Duration is where power is at..alot of the Mustang crowd are too centered on the lift of the cam..but I'll tell you now...if the heads flow well at mid-low lift,then a set of lower lift cams with a decent amount of duration will be quite powerful,while keeping the safety factor there to prevent spring breakage.These Modulars are quite rough on springs when you start having to ramp up the valve speed to reach that huge lift value that the valve is at for only a fraction of a second...it's not worth the headache for and extra .050" lift when you can just keep it open at a lower lift for a longer amount of time.
They're good cams...And I'll own a set in the near future..but I'll be buying mine from a reputable dealer(Modularperformance.com)for a mere $20-$30 more....I know I'll be taken care of buying from Mike and John.
JL

1997 Thunderbird-4.6L/[email protected]
'05 F250 Crewcab 2WD-6.8L V10/5R110/4.10
2010 Lincoln MKT-3.5L EcoBoost V6/[email protected] stock
Fuelly
Johnny Langton is offline  
post #6 of 9 (permalink) Old 08-01-2003, 10:10 PM Thread Starter
6th Gear Poster
 
Join Date: Jan 2003
Location: Jacksonville, NC USA
Age: 54
Posts: 627
Cool info Johnny... I had thought they would, but I was looking for some feedback. Could be a realitively easy mod, although expensive.

Chad... those numbers are sick! Please tell me that is not naturally aspirated!

Dan
2008 Nissan 350Z Grand Touring
2010 Ford F150 Lariat
a bunch of motorcycles
(haven't come across my dream 97 Tbird yet)
DanQ is offline  
post #7 of 9 (permalink) Old 08-01-2003, 10:32 PM
Astrophysicist / PostWhore
 
66dvlbrd68's Avatar
 
Join Date: Jul 2002
Location: Albuquerque, NM (visit NM!)
Age: 37
Posts: 2,028
Quote:
Originally posted by Johnny Langton
The OE ford cams haeve ZERO overlap on the intake to exhaust transition,and this has alot to do with emmisions requirements.This also hinders power output signifigantly.
The new Comp Cams grinds have very nice profiles available,and I've seen nothing but good results out of them.Duration is where power is at..alot of the Mustang crowd are too centered on the lift of the cam..but I'll tell you now...if the heads flow well at mid-low lift,then a set of lower lift cams with a decent amount of duration will be quite powerful,while keeping the safety factor there to prevent spring breakage.These Modulars are quite rough on springs when you start having to ramp up the valve speed to reach that huge lift value that the valve is at for only a fraction of a second...it's not worth the headache for and extra .050" lift when you can just keep it open at a lower lift for a longer amount of time.
They're good cams...And I'll own a set in the near future..but I'll be buying mine from a reputable dealer(Modularperformance.com)for a mere $20-$30 more....I know I'll be taken care of buying from Mike and John.
JL
Lets say a person purchases ModMax or Comp Cams bump sticks. Would the purchase of new valve springs be needed? I saw in either MM&FF or 5.0 & Super Fords some new 'beehive' type springs for modulars (unless I'm smoking). Overkill in this situation?

And for those, like myself that have 'workable heads,' is it worth going to such an aftermarket grind, or is the PI cam (higher lift) good enough? (This is with the stock heads, no P&P or anything else). I know you had success with just swapping cams, hence the question.

Not entirely dumb questions...just to squeeze some more info out of you...

(if you don't mind sharing, of course. )

Mike | RSW | THP | MF | SRTConnection |

1996 Ford Thunderbird LX V8 + 1992 Ford Mustang hatchback + 1989 Ford Mustang notchback = no where else to park at my house!
66dvlbrd68 is offline  
post #8 of 9 (permalink) Old 08-01-2003, 11:10 PM
High-Mileage 4.6L Thrasher
Moderator
 
Johnny Langton's Avatar
 
Join Date: Jul 2002
Location: Texas
Posts: 3,232
Quote:
Originally posted by 66dvlbrd68
Lets say a person purchases ModMax or Comp Cams bump sticks. Would the purchase of new valve springs be needed? I saw in either MM&FF or 5.0 & Super Fords some new 'beehive' type springs for modulars (unless I'm smoking). Overkill in this situation?

And for those, like myself that have 'workable heads,' is it worth going to such an aftermarket grind, or is the PI cam (higher lift) good enough? (This is with the stock heads, no P&P or anything else). I know you had success with just swapping cams, hence the question.
Yes,the new Comp spings are beehives,so are the stock '96-up springs.
The OE springs are good up to approx .540" lift..at a low duration like the OE cams..and have a light spring seat load..so they're not good for much above 5500 rpms,and a trip or two to 6500rpms and they're done..
You'll want a new set of springs for any performance cam-just be wary of any cams that have more than .525" lift..I'm not convinced that even these new Beehive springs from Comp are able to handle those kinds of valve ramp speeds for a long time without breaking.
Chad's cams are rather aggressive..I'll not disclose the spec-I'll leave him to do that if he wants..but he knows exactly what I'm worried about with high lift and possible spring breakage.
You can't go wrong with a cam that has a healthy amount of duration..just don't get to aggressive or your vacuum will be too low for proper function of the brake booster,etc...
JL

1997 Thunderbird-4.6L/[email protected]
'05 F250 Crewcab 2WD-6.8L V10/5R110/4.10
2010 Lincoln MKT-3.5L EcoBoost V6/[email protected] stock
Fuelly

Last edited by Johnny Langton; 08-02-2003 at 08:21 AM.
Johnny Langton is offline  
post #9 of 9 (permalink) Old 08-02-2003, 02:15 AM
Renegade
 
chadg's Avatar
 
Join Date: Aug 2002
Location: Minnesota
Age: 37
Posts: 529
JL's right with the cams. I broke a valve spring not 500 miles into the new motor. To top it all of it broke at 1400 RPM while i was taking off from a stop sign. And my cams are the STREET version, not even race. Luckily I have no vacuum problems with such an agressive cam.

And fzrdan, i've got a Vortech S-Trim to help me with my numbers.

-Chad
Down for the count
chadg is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TCCoA Forums 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 for yourself.

Email Address:
OR

Log-in











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



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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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