StreetStangs.net  

Go Back   StreetStangs.net > Technical > Ford Pushrod Tech (5.0 & 5.8)

Reply
 
Thread Tools Display Modes
Old 08-27-2006, 08:51 PM   #11
QWKSNKE
3v's are slow
 
QWKSNKE's Avatar
 
Join Date: Dec 2004
Location: Here and There
Posts: 17,152
Quote:
Originally Posted by coupe View Post
nice post

The discussion possibilities of cylinder head flow, port size, and power potential are endless and often pointless.

.
Its only pointless when you don't have a cam picked out. If you know in your cam profiles that you considering in your combo, knowing head flow #'s can be valuable.
__________________
2009 Porsche Carrera S
2008 ///AMG C63.. Eurocharge Tune. RIP
2019 AMG GLC43..wife's
03 F250 SD.. Edge Evo, AFE Stage 1 CAI
08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's
01 Cobra vert... wife's

I need a new toy
QWKSNKE is offline   Reply With Quote
Old 08-27-2006, 09:05 PM   #12
1sicklx
BamaMafia 4 Life
 
1sicklx's Avatar
 
Join Date: Feb 2005
Location: Lake View, AL
Posts: 2,577
Quote:
Originally Posted by QWKSNKE View Post
Its only pointless when you don't have a cam picked out. If you know in your cam profiles that you considering in your combo, knowing head flow #'s can be valuable.
but on the other hand there are a lot of people that pick there cam based on the rest of their setup (i.e. custom cam), making decisions on your goals for power curve, fuel economy, rpm range, specific usage, ect ... would be the first things to decide on .. then you have a couple decisions to make about how to go about meeting those goals. Knowing the flow rates is good general info either way imo. "knowledge is power"
__________________
1999 Ford F-150 Lariat

Last edited by 1sicklx; 08-27-2006 at 09:25 PM.
1sicklx is offline   Reply With Quote
Old 08-28-2006, 08:30 AM   #13
coupe
Super Moderator
 
coupe's Avatar
 
Join Date: Dec 2004
Posts: 6,313
Here's a tidbit of info for you guys:

Roush engine shop tested a 427 with a set of AFR 225's. Then, due to some unforseeable circumstances, needed to swap in another set of heads...DART, which is nearby Roush's shop, got them into a set of CNC 225's. Power was up 26 hp and torque was up 13 ft. lbs (everything else the same). And this was with a head that flowed less by the numbers at each lift.
__________________
" If you can't explain it simply, you don't understand it well enough. " - Albert Einstein
coupe is offline   Reply With Quote
Old 08-29-2006, 10:40 AM   #14
oo-gonzo
Senior Member
 
oo-gonzo's Avatar
 
Join Date: Aug 2006
Location: Gadsden, AL.
Posts: 290
Cool!

That is sweet and to think! I was just about to ask what the difference was in the gt-40 cobra and the gt-40 explorer! I was wondering, what year models on the ford explorer have these heads on them? and Do the gt-40 p heads have good enough valve springs for an E303 cam?
oo-gonzo is offline   Reply With Quote
Old 08-29-2006, 03:14 PM   #15
QWKSNKE
3v's are slow
 
QWKSNKE's Avatar
 
Join Date: Dec 2004
Location: Here and There
Posts: 17,152
Quote:
Originally Posted by oo-gonzo View Post
That is sweet and to think! I was just about to ask what the difference was in the gt-40 cobra and the gt-40 explorer! I was wondering, what year models on the ford explorer have these heads on them? and Do the gt-40 p heads have good enough valve springs for an E303 cam?
any explorer with a V-8
__________________
2009 Porsche Carrera S
2008 ///AMG C63.. Eurocharge Tune. RIP
2019 AMG GLC43..wife's
03 F250 SD.. Edge Evo, AFE Stage 1 CAI
08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's
01 Cobra vert... wife's

I need a new toy
QWKSNKE is offline   Reply With Quote
Old 08-29-2006, 04:35 PM   #16
coupe
Super Moderator
 
coupe's Avatar
 
Join Date: Dec 2004
Posts: 6,313
IIRC, the first Explorer with the 5.0L (year?) had the actual GT40 heads like the '93 Cobra. Then the subsequent ones had the P's...
__________________
" If you can't explain it simply, you don't understand it well enough. " - Albert Einstein
coupe is offline   Reply With Quote
Old 08-30-2006, 10:02 AM   #17
oo-gonzo
Senior Member
 
oo-gonzo's Avatar
 
Join Date: Aug 2006
Location: Gadsden, AL.
Posts: 290
Just wondering. Why did ford make these different type heads? I mean if the heads made for the cobras flows nearly the same as the xplorer heads, why not just stick with one set of heads for V8's. I'm looking at cost and production. I don't get how ford would design so mean different things that are too closely related? I'm also not an engineer or automotive designer!LOL
oo-gonzo is offline   Reply With Quote
Old 08-30-2006, 10:17 AM   #18
QWKSNKE
3v's are slow
 
QWKSNKE's Avatar
 
Join Date: Dec 2004
Location: Here and There
Posts: 17,152
Quote:
Originally Posted by oo-gonzo View Post
Just wondering. Why did ford make these different type heads? I mean if the heads made for the cobras flows nearly the same as the xplorer heads, why not just stick with one set of heads for V8's. I'm looking at cost and production. I don't get how ford would design so mean different things that are too closely related? I'm also not an engineer or automotive designer!LOL
performance improvement I guess.

The 5.0 engine ended in the mustang in 95. 5.0 explorers didn't come out until 96 or 97
__________________
2009 Porsche Carrera S
2008 ///AMG C63.. Eurocharge Tune. RIP
2019 AMG GLC43..wife's
03 F250 SD.. Edge Evo, AFE Stage 1 CAI
08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's
01 Cobra vert... wife's

I need a new toy
QWKSNKE is offline   Reply With Quote
Old 08-30-2006, 12:30 PM   #19
Italian LX
Daddy x4 ...we're done
 
Italian LX's Avatar
 
Join Date: Dec 2004
Location: Oxford, AL
Posts: 11,549
Quote:
Originally Posted by oo-gonzo View Post
Just wondering. Why did ford make these different type heads? I mean if the heads made for the cobras flows nearly the same as the xplorer heads, why not just stick with one set of heads for V8's. I'm looking at cost and production. I don't get how ford would design so mean different things that are too closely related? I'm also not an engineer or automotive designer!LOL
I read where it was a last minute design change in order to bring the emissions down in the 5.0L in the Explorer (at least until the 4.6L was available). They wanted to keep offering a V-8 model, but the only one they had at the time was the old and tired 5.0L, so rather than sinking anymore money into the design of the 302, they decided just to try and redesign the head... and ended up doing a good job of it.

On a side note, the other reason why a set of P heads help performance is becuase of the smaller combustion chamber.... 59cc vs. the Gt-40 65cc.
__________________
-Brian

'86 Mustang GT Convertible
'88 Mustang LX coupe
'11 Odyssey TE
'21 Insight Touring
Italian LX is offline   Reply With Quote
Old 05-19-2008, 03:09 PM   #20
1Quik85GT
Senior Member
 
Join Date: Apr 2005
Posts: 895
Quote:
Originally Posted by QWKSNKE View Post
Thanks for the sticky Tommy.


It is interesting to me that GT-40 'P' heads flow better than the GT-40 heads that came off my cobra even though they have smaller exhaust valves
Lee,

You would be suprised what we are doin in class racing with port volumes etc. It goes back to bigger isnt always better, its velocity, and speed that makes HP
1Quik85GT is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -6. The time now is 05:13 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.