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Topic: Cobra engine vs Explorer engine (Read 3645 times) previous topic - next topic

Cobra engine vs Explorer engine

Reply #15 –
Cleaned up and pretty right here:

http://www.tristatecylinderhead.com/catalog/product_info.php?cPath=41&products_id=40

As far as which flows better?  The P's
Quote
I'll let you know when I get my car set up and run at least half a second faster than similar "P" headed combos


Without port work? ......If you say so.....http://sbftech.com/index.php/topic,171.0.html
Quote from: Thumper460

Actually... there are a LOT of 302/306 in the 12s with GT40s and the GT40Ps and Ported E7s!!  Add port work to the 40s and the power is greater.. install the 1.55 40 exhaust valve in the better flowing P's ( stock is 1.46 in the P's) and pull more power!!


In case you don't know who Thumper is:

http://www.thumperoforangepark.com/

This guy's been porting heads forever.  I have no reason to doubt what he says.  When he posts, you should pay attention to it.

BTW Tmoss of http://www.tmossporting.com/ says the same thing about the P's vs non P's...

Quote
A good combo for better than stock HO power for cheap is a GT40P Explorer long block, stock HO cam, Gt40 style intake, 65mm TB
and a set of 1.7 rockers....
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Cobra engine vs Explorer engine

Reply #16 –
Quote from: 1BadBird;209020
:evilgrin:  Runs and sounds good toooo!!!  :evilgrin:

:burnout:                                      :burnout:


Thanks. You've heard it and even with the py 2.25" tubing aft of the 2.5 H pipe it sounds mean:evilgrin:

Quote from: V8Demon;209124
and a set of 1.7 rockers....


Yeah forgot about that. I use 1.6 roller rockers because with my cam I'd be smacking valves :hick:
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Cobra engine vs Explorer engine

Reply #17 –
Not necessarily....

Where is the piston when the valve --either one-- is Fully open?;)

http://www.fordmuscle.com/fundamentals/pistontovalve/index.shtml
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Cobra engine vs Explorer engine

Reply #18 –
V8Demon...I understand what you're saying, but I still haven't seen the flow bench set-up. 

And it's not all about just the heads, it's about the rest of the set up....I didn't see anybody else running 14.30's into a 20mph head-wind with just an HO swap, exhaust and 3.73's with a stock AOD/convertor.  I'm still a few months away from even thinking about building my next motor, so things may change...the one thing that'll remain the same is the iron GT-40's.  If everybody has a hard-on for the "P" heads, good, more iron GT-40's for me...lol.

If I could afford to get a valve job and port work done...then I'd run the "P" heads, but that just isn't in the budget for me.  I'm not, by any means, saying that the "P" heads are no good...I just prefer the regular GT-40's.

-Don
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

Cobra engine vs Explorer engine

Reply #19 –
Quote
And it's not all about just the heads, it's about the rest of the set up


Thanks.:rolleyes: I knew that already.

12's are possible in stock head/cam fox Mustangs BTW...

You said .5 sec faster than similar "P" headed combos...

Guess my idea of "similar" differs from yours. 

Quote
I didn't see anybody else running 14.30's into a 20mph head-wind with just an HO swap, exhaust and 3.73's with a stock AOD/convertor.


Weight? Suspension?  I do believe Kingcars is in 14 land with 3.27's IIRC...Fish around SBFtech.com as well. Plenty of stock head/cam Birds and cats over there running good #'s.  If you want cold hard proof of the "P Vs. Non" head flow question ask over there and more than one person will give you the proof you require.

**Edit**  Your specs 
Quote
Ride:
1988 T-Bird
Engine type and displacement:
302
Induction:
N/A
Major modifications:
HO conversion, f/l headers, full exhaust-dumped, 3.73's, shift kit,electric fan, U/D pulley
Tranny type:
Automatic
Tires:
Street Radials
Race weight:
3250
Horsepower:
0.0
60 foot time:
2.110
1/8 Mile ET:
9.304
1/8 Mile MPH:
76.38
1/4 Mile ET:
14.382
1/4 Mile MPH:
96.78
Track Name:
Atco Raceway

As far as times are concerned in a quarter.  I have no basis myself as I've never run a stock HO cam even in my old E7 setup.  The old cam I had was a phenominal fit with my ported heads.  You could squeeze a 14.1-14.2 if you can get that 60 foot down though.  You're right on track for a race weight of 3250...
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Cobra engine vs Explorer engine

Reply #20 –
Quote from: V8Demon;209224
  You could squeeze a 14.1-14.2 if you can get that 60 foot down though.  You're right on track for a race weight of 3250...


14.38 into a 20mph constant head wind with gusts of 30-35mph that night...and it was a little squirrelly through the '60.  And my 225lb butt wasn't figured into the weight equation either.

Not too bad for a 300k mile J/Y engine.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads
 

Cobra engine vs Explorer engine

Reply #21 –
So how many engine HP you think you can get out of an explorer engine with an HO cam, 1.7 rockers, good headers, and maybe better valve springs?

Cobra engine vs Explorer engine

Reply #22 –
I don't really do HP numbers because they're pretty useless to me...the 'strip is my dyno...lol.

But, if I had to guesstimate, I would think 240-260 flywheel horsepower could be had....according to my MPH, the old dragstrip dyno calculator put my old 300k mile HO at 240 flywheel horsepower...but we all know that's just a pretty round-about method for figuring hp.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

Cobra engine vs Explorer engine

Reply #23 –
I was hearing the Cobra was more realistically around 260-270 hp at the FW with a milder cam, so I was thinking more than that.

I did just read that the compression is down on the GT40P engine compared to others.  Anyone confirm that?

I found my own answer.  Compression is actually up. Good read.  http://www.mustang50magazine.com/techarticles/4379_gt_40p_heads/index.html

Cobra engine vs Explorer engine

Reply #24 –
By the SOTP meter I'm guessing mine makes ~270-280 fwhp but I'm using a slightly better than stock HO cam.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Cobra engine vs Explorer engine

Reply #25 –
Did some more research and found that GT40, GT40P, and HO engines were all 9:1 comp ratio.

That's not to say that if you put GT40P heads on an HO you don't increase that ratio.

Cobra engine vs Explorer engine

Reply #26 –
"P" heads on an HO supposedly raise compression slightly and the old standard GT-40's drop compression slightly.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads