Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> mileage
RonnieJ
post Jul 21 2015, 07:48 AM
Post #1


RonnieJ
**

Group: Members
Posts: 230
Joined: 16-June 03
From: Sterling Heights, Michigan
Member No.: 829
Region Association: Upper MidWest
What kind of mileage can you expect from a well tuned 1.7 with dual 40 carbs?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914itis
post Jul 21 2015, 07:51 AM
Post #2


Advanced Member
****

Group: Members
Posts: 2,892
Joined: 9-October 10
From: New York City
Member No.: 12,256
Region Association: North East States
QUOTE(RonnieJ @ Jul 21 2015, 09:48 AM) *

What kind of mileage can you expect from a well tuned 1.7 with dual 40 carbs?

I would say 30mpg
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Jul 21 2015, 08:32 AM
Post #3


Chimp Sanctuary NW. Check it out.
***************

Group: Members
Posts: 22,084
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch
29ish on the highway. Way less zipping around town in 2nd and 3rd gear.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RonnieJ
post Jul 21 2015, 08:36 AM
Post #4


RonnieJ
**

Group: Members
Posts: 230
Joined: 16-June 03
From: Sterling Heights, Michigan
Member No.: 829
Region Association: Upper MidWest
It was set up with a single carb that sucked and it did not do well on gas mileage at all. I am going on a 900 mile round trip starting tomorrow and we'll see how it does now.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
thelogo
post Jul 21 2015, 01:35 PM
Post #5


Senior Member
***

Group: Retired Members
Posts: 1,510
Joined: 6-April 10
Member No.: 11,572
Region Association: None
My 914(1.7 stock f.I) used a full tank for my weekly commute

My Mazda protege also used a full tank

16 gallons vs 12.5

And the Mazda gets about 28 mpg

So the 914 get less I'm guessing 25 mpg which is damn good I think (IMG:style_emoticons/default/beer3.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Sbradley@netins.net
post Jul 21 2015, 02:35 PM
Post #6


Newbie
*

Group: Members
Posts: 7
Joined: 20-May 15
From: Cascade Iowa
Member No.: 18,745
Region Association: Upper MidWest
would the FI engine get better gas mileage?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jor
post Jul 21 2015, 02:46 PM
Post #7


Just happy to be here.
**

Group: Members
Posts: 183
Joined: 28-July 14
From: LA
Member No.: 17,693
Region Association: Southern California
FWIW, my nicely tuned (thank you again Heeltoe914) 2.0l with twin Weber 40s gets about 23 mpg in mixed use driving. I'd think you'd get around 28 mpg with a carbureted 1.7 in highway use at reasonable speeds.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aircooledtechguy
post Jul 21 2015, 02:59 PM
Post #8


The Aircooledtech Guy
***

Group: Members
Posts: 1,966
Joined: 8-November 08
From: Anacortes, WA
Member No.: 9,730
Region Association: Pacific Northwest
With a single Weber kit, expect 15-ish (IMG:style_emoticons/default/mad.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Jul 21 2015, 03:20 PM
Post #9


914-6 GT in waiting
***************

Group: Members
Posts: 19,301
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
My 2.0 with 40 webers and hot cam got 28 highway, my stock 1.7 with fi gets 36.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BeatNavy
post Jul 21 2015, 03:34 PM
Post #10


Certified Professional Scapegoat
****

Group: Members
Posts: 2,924
Joined: 26-February 14
From: Easton, MD
Member No.: 17,042
Region Association: MidAtlantic Region
Mark, that's sick mileage on your 1.7. I assume that's primarily highway driving, right? What do people typically get on "parkway" driving like I do going to and from work? I think I'm sub-20 MPG which pales compared to what some report. The parkway driving is 50 mph for a mile and a half then stop at a light. Rinse, repeat, etc.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TheCabinetmaker
post Jul 21 2015, 03:37 PM
Post #11


I drive my car everyday
*****

Group: Members
Posts: 8,301
Joined: 8-May 03
From: Tulsa, Ok.
Member No.: 666
Fifteen mpg on a1.7 with a single Weber? I'm not buying it. You had another problem. I got almost 40 mpg from my injected 1.7, and over 30 on a 2.0 with a single Weber. I now have that same 2.0 which is now a 2056 with Raby cam, and the fuel injection reinstalled that still gets over 30 on the hiway. If your getting crap mileage from a 914 make sure that all the settings (dwell, timing, valves, etc) are correct and you have adequate compression before blaming the induction system.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Jul 21 2015, 03:49 PM
Post #12


914-6 GT in waiting
***************

Group: Members
Posts: 19,301
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
QUOTE(BeatNavy @ Jul 21 2015, 05:34 PM) *

Mark, that's sick mileage on your 1.7. I assume that's primarily highway driving, right? What do people typically get on "parkway" driving like I do going to and from work? I think I'm sub-20 MPG which pales compared to what some report. The parkway driving is 50 mph for a mile and a half then stop at a light. Rinse, repeat, etc.

Around town I'm seeing upper 20's -30 from the 1.7. I never saw less than 20+ from my 2.0 no matter how I drove it.
The guys who drive stock 3.2 - 911's report low to mid 20's on the highway so I'm expecting at least that much from my 3.2 GT build.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Beeliner
post Jul 21 2015, 04:07 PM
Post #13


Member
**

Group: Members
Posts: 398
Joined: 2-August 14
From: Fairfield, CT
Member No.: 17,725
Region Association: North East States
The fuel injected 914s I had in the 70s got good local mileage, and I remember leaving NYC around 4:30am and crossing the Pennsylvania border into Ohio before filling up. I don't remember where we filled the tank the second time, but we pulled into Cedar Rapids, Iowa that night with some fuel in the tank.

Just about 1,000 miles. 35mpg sticks in my mind.

15gallons x 35 mpg = yeah, we did 400 miles between stops.

Speed limits west of Pennsylvania were 75 and the car was comfortable at that speed.

Gas was about $.35 a gallon, so I never paid too much attention to mileage....

(IMG:style_emoticons/default/driving.gif)

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BeatNavy
post Jul 21 2015, 04:11 PM
Post #14


Certified Professional Scapegoat
****

Group: Members
Posts: 2,924
Joined: 26-February 14
From: Easton, MD
Member No.: 17,042
Region Association: MidAtlantic Region
QUOTE(mepstein @ Jul 21 2015, 05:49 PM) *

QUOTE(BeatNavy @ Jul 21 2015, 05:34 PM) *

Mark, that's sick mileage on your 1.7. I assume that's primarily highway driving, right? What do people typically get on "parkway" driving like I do going to and from work? I think I'm sub-20 MPG which pales compared to what some report. The parkway driving is 50 mph for a mile and a half then stop at a light. Rinse, repeat, etc.

Around town I'm seeing upper 20's -30 from the 1.7. I never saw less than 20+ from my 2.0 no matter how I drove it.
The guys who drive stock 3.2 - 911's report low to mid 20's on the highway so I'm expecting at least that much from my 3.2 GT build.

Wow. I need to look at this closer to see what I'm really getting. Or brush up on my basic math and division skills....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RonnieJ
post Jul 21 2015, 04:41 PM
Post #15


RonnieJ
**

Group: Members
Posts: 230
Joined: 16-June 03
From: Sterling Heights, Michigan
Member No.: 829
Region Association: Upper MidWest
Thanks all I drove it on the same trip last year with a single carb and I thought I was going to go broke buying gas.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Jul 21 2015, 04:51 PM
Post #16


914-6 GT in waiting
***************

Group: Members
Posts: 19,301
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
QUOTE(RonnieJ @ Jul 21 2015, 06:41 PM) *

Thanks all I drove it on the same trip last year with a single carb and I thought I was going to go broke buying gas.

Something's wrong. A single carb is not optimal but should still work ok. At least get you from a-b without sucking up too much gas.
I filled up before Hershey -70 miles and then filled up again before the rally. I could only get 2 gallons in the tank. I know that's not scientific and maybe I really used 2.5 but the point is these cars sip gas, not gulp it. If milage sucks, there's something wrong.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Porschef
post Jul 21 2015, 08:00 PM
Post #17


How you doin'
****

Group: Members
Posts: 2,165
Joined: 7-September 10
From: LawnGuyland
Member No.: 12,152
Region Association: North East States
QUOTE(The Cabinetmaker @ Jul 21 2015, 05:37 PM) *

Fifteen mpg on a1.7 with a single Weber? I'm not buying it. You had another problem. I got almost 40 mpg from my injected 1.7, and over 30 on a 2.0 with a single Weber. I now have that same 2.0 which is now a 2056 with Raby cam, and the fuel injection reinstalled that still gets over 30 on the hiway. If your getting crap mileage from a 914 make sure that all the settings (dwell, timing, valves, etc) are correct and you have adequate compression before blaming the induction system.


Like your's Curt, Ljet on a 2056 with a 9550 cam, 9:1 comp. I only get about 24 mpg on the highway, but I believe it's mostly due to not keeping my foot out of it. One of these days I'll try not doing so, and see if that helps.

It's just too damn fun...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Jul 21 2015, 08:30 PM
Post #18


914 Wizard
**********

Group: Members
Posts: 11,628
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
all of my carb'd cars got around 23 mixed.
altitude and slightly richer mixture on purpose for heat reasons/DE driving.

a 1.7 should beat that

I could beat 30mpg highway if I found a way to cheat
(once drafted a semi above the speedlimit at night for 100miles... about 33 that night)

my fi 1.7 did much better... over 30 regularly on the highway at altitude

in the 2.0FI with a slightly tweaked mps (jason's motor) I just drove to newport beach in the spring... lots of highway miles, but some days of twistys around palm springs, skirting joshua tree, and stop and go traffic for hours on the coast........ 2500+ miles in about 5 days...
29.something mpg average
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Hank914
post Jul 21 2015, 09:23 PM
Post #19


Member
**

Group: Members
Posts: 389
Joined: 7-April 14
From: CA and OR
Member No.: 17,215
Region Association: None
I do lots of I5 cruising, 550 miles at a stretch. In 5th gear at 3000 rpm is a bit north of 70mph gets me 29-30mpg. If I'm down to 65mph (2850rpm?) I'm into the low 30's. Over 80 mpg average and I'm 27-28mpg. All of that is over 400 miles a tank.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Hank914
post Jul 21 2015, 09:24 PM
Post #20


Member
**

Group: Members
Posts: 389
Joined: 7-April 14
From: CA and OR
Member No.: 17,215
Region Association: None
QUOTE(Hank914 @ Jul 21 2015, 08:23 PM) *

I do lots of I5 cruising, 550 miles at a stretch. In 5th gear at 3000 rpm is a bit north of 70mph gets me 29-30mpg. If I'm down to 65mph (2850rpm?) I'm into the low 30's. Over 80 mpg average and I'm 27-28mpg. All of that is over 400 miles a tank.


Dual carbs, no FI.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 30th May 2024 - 12:24 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...