Fuel Economy for a 347 stroker vs 302?? - Vintage Mustang Forums

 
Thread Tools
post #1 of 13 (permalink) Old 11-07-2005, 09:43 PM Thread Starter
Senior Member
 
Join Date: Jul 2000
Location: Toronto, Ontario Canada
Posts: 196
OK, may seam odd, but stroking my 5.0L (to a 347) won't cost me any weight (vs using a 351w), Has anyone here compared fuel economy between a stroked 302 and a regular 302?
Maybe the improved lowend torque may help city economy?

Pete

71 Mustang Convertible
5.0L EFI & 5 Spd
Green on Ginger
Torque Thrust D's
PROY is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 11-07-2005, 10:42 PM
Senior Member
 
ylexot's Avatar
 
Join Date: Aug 2000
Location: Garner NC
Posts: 4,651
You're barking up the wrong tree my friend. More cubes = more gas/stroke = less economy. you want economy, get a 6.

Formerly of the Permanently Addicted...
Let it be known that I do not street race or condone that sort of thing
- unless the 'b@stard deserves it.
Someone takes his pants off and the rafters knock
Rock is dead they say
Long Live Rock!
67 conv. 289 4spd(mine), 67 coupe 289 Export(swmbo's)

ylexot is offline  
post #3 of 13 (permalink) Old 11-07-2005, 10:46 PM
Senior Member
 
Join Date: Apr 2004
Location: Houston (Kingwood), Texas
Posts: 1,844
Send a message via AIM to Ronstang1966 Send a message via Yahoo to Ronstang1966
If you are concerned about economy then you shouldn't be playing with strokers in the first place.

I am the member formally known as RonK.

1957 T-Bird
1966 Shelby G.T.350H
1966 Mustang Fastback Restomod under construction
Ronstang1966 is offline  
post #4 of 13 (permalink) Old 11-07-2005, 11:15 PM
Senior Member
 
mstngjoe's Avatar
 
Join Date: Jul 2000
Location: Oregon
Posts: 3,843
Quote:
..Fuel economy...347 stroker...
Oxymoron.
mstngjoe is offline  
post #5 of 13 (permalink) Old 11-07-2005, 11:18 PM
Senior Member
 
jbsteven's Avatar
 
Join Date: Jan 2005
Location: houston texas
Posts: 1,009
I get 8 mpg on my 347.

68.5 CJ Fastback (cover car for John's Mustang 2006 catalog), 68 GT/CS 390 auto, 68 Coupe (cover car for John's Mustang 2005 Summer catalog), 66 Restomod hotrod 347, AOD, NOS, Currie and coil overs, 2003 Ferrari 575M F1, 2000 Ferrari 360 Modena, 2003 CL600 Mercedes V-12 twin turbo 540 HP/590 lbs. ft. 1 of 437 made worldwide
jbsteven is offline  
post #6 of 13 (permalink) Old 11-07-2005, 11:21 PM
Senior Member
 
sosADAMsos's Avatar
 
Join Date: Feb 2004
Location: Whittier, CA
Posts: 902
i was actually wondering the same thing. i would love to have a 347, but seeing as its my daily driver i dont think i can do 8mpg. ill stick with my 12.

'65 Fastback
sosADAMsos is offline  
post #7 of 13 (permalink) Old 11-07-2005, 11:39 PM
Gone but never forgetten
 
johnpro's Avatar
 
Join Date: Jul 2000
Location: Roseville, California
Posts: 25,239
A LOT depends on the transmission (got over-drive?), rear gears and the way you drive it.

I get 20mpg freeway in my '66 and run 14.1 quarters. I haven't gotten enough miles to check it yet, but I'm sure my 408 in the '69 gets better than 12 *LOL*.

VMF Jedi Knight who's spirit will be with us forever.

Best Auto Insurance | Auto Protection Today | FREE Trade-In Quote
johnpro is offline  
post #8 of 13 (permalink) Old 11-08-2005, 01:33 AM
Senior Member
 
sosADAMsos's Avatar
 
Join Date: Feb 2004
Location: Whittier, CA
Posts: 902
:no:

'65 Fastback
sosADAMsos is offline  
post #9 of 13 (permalink) Old 11-08-2005, 01:39 AM
Senior Member
 
LMan's Avatar
 
Join Date: May 2003
Location: where Im standing
Posts: 5,066
if you are worried about economy, you don't want a stroker.
LMan is offline  
post #10 of 13 (permalink) Old 11-08-2005, 07:07 AM
Senior Member
 
2bav8's Avatar
 
Join Date: Aug 2002
Location: Mesa, AZ
Posts: 4,092
With 4.11s, a .68 5th gear I get 16 MPG with a 347.
IMO, reducing the 4.11s to 3.50 gears and swapping out my Vic Jr. intake for a Weiand Stealth would easily get me another 2-4 MPG on the freeway.
Not bad IMO for a reasonably stout stroker motor :winkgrin:


1966 Coupe build for SCCA Autocross
347 V8 - Tremec TKO - ORP Suspension
www.geocities.com/2bav8
2bav8 is offline  
post #11 of 13 (permalink) Old 11-08-2005, 10:23 AM Thread Starter
Senior Member
 
Join Date: Jul 2000
Location: Toronto, Ontario Canada
Posts: 196
I expected alot of 'if you want economy why thing stroker...."
I don't need huge power, but if I am rebuiding my 92 5.0L motor, would it hurt alot in the economy departent if I stroked it. 331 might be a good alternative.
I have T5 5 Speed, and with my 92 EFI fuel economy is much better than the old carb 302, AND I have alot more torque and HP.
YES if you want output you have to have input, but driven conservatively (which is difficult) can good fuel economy be maintained with an efi stroker?
Other than the 14mpg 400hp 4:10 gears race cars does anybody have mild street driven (highway fuel economy numbers for a stoked 5.0L)?
Thanks for the lively input
Pete

71 Mustang Convertible
5.0L EFI & 5 Spd
Green on Ginger
Torque Thrust D's
PROY is offline  
post #12 of 13 (permalink) Old 11-08-2005, 11:17 AM
Senior Member
 
buening's Avatar
 
Join Date: Sep 2000
Location: Stinky Town, IL
Posts: 8,622
I don't think it will affect it as much as people think. All mentioned above (trans, rear gears, etc) will affect it as well as cam selection. I lost around 5 mpg just with my cam swap and it isn't too radical. I know people that get close to 30mpg in their 5.0 EFI cars. Stroking it may dump a few mpg down the drain, but it all depends on the other factors mentioned or if you go with all stock components (less the strocker kit).

70 Mach 1 - 351w/T-56
70 SportsRoof - 302/C4
05 F150 FX4
06 BMW 530xi

T56 Conversion
DIY Ron Morris-like Motor Mounts
DIY Engine Crossmember
DIY Camber Eccentric Eliminator Plates
buening is offline  
post #13 of 13 (permalink) Old 11-08-2005, 12:14 PM
Senior Member
 
DrStang's Avatar
 
Join Date: Apr 2001
Location: Palm Springs, California
Posts: 2,303
Quote:
Thanks for the lively input
Pete
Well put



"A good friend will help you move. A great friend will help you move a dead body"

1965 A-Code Fastback
Built, September 14, 1964 (San Jose)
Viper red, White/red interior
TCP R&P, G Bar rear 4 link/w shockwaves
Global West Upper/Lower/Strut Rods
Ride-Tech Air ride
4 wheel Cobra disc brakes/Hydroboost
363 Stroker/Paxton Supercharger
Mass-Flo EFI
Owned since 1983
DrStang is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Vintage Mustang 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Trackbacks are On
Pingbacks are On
Refbacks are Off

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