what is a fuel economy cam? - LS1TECH

Log In 


Generation III Internal Engine a.sponlink:link {font-size: 9px;} img.surround{ border-color: #000000; border-width:1px; margin-bottom: 9.5px; } span.sponsortext { font-size: 10px; }
1997-2006 LS1 | LS6
Sponsored by
Texas Speed & Performance

what is a fuel economy cam?

Reply
 
Thread Tools Search this Thread
Old 08-30-2007, 12:25 AM   #1
On The Tree
Thread Starter
 
Join Date: Feb 2006
Posts: 109
Default what is a fuel economy cam?

There are as you all know a lot of cam choises and know how if you want to make more power in a LSx engine.

But what if I am happy with the power, and want to maximize the mileage,
how should such a cam be designed?

How should the valve events look like for max economy?
(I find it difficult to belive that the stock 5,3 cam is the ultimate for economy)

//
tahoe is offline   Reply With Quote
Old 08-30-2007, 12:56 AM   #2
TECH Resident
iTrader: (16)
 
NoGamesLS1's Avatar
 
Join Date: Jul 2005
Posts: 800
Default

I know guys are getting some great highway milage with the 224/similar cams
NoGamesLS1 is offline   Reply With Quote
Old 08-30-2007, 01:34 AM   #3
On The Tree
Thread Starter
 
Join Date: Feb 2006
Posts: 109
Default

Just to clarify, in my question I ment BETTER mileage than stock.

//
tahoe is offline   Reply With Quote
Old 08-30-2007, 07:25 AM   #4
11 Second Truck Club
 
Join Date: Jun 2002
Location: Alvin, TX
Posts: 536
Default

My car has a 224 cam and has achieved 28mpg on multiple road trip occasions. Of course I drove fairly easy in 6th gear with cruise on about 70-73mph.
The good tune helps alot too. There's alot of cars around with garbage tunes and unhappy owners as well so results vary.
LS1BirdDRG is offline   Reply With Quote
Old 08-30-2007, 08:02 AM   #5
LS1 Tech Administrator
iTrader: (14)
 
Patrick G's Avatar
 
Join Date: Nov 2001
Location: Victoria, TX
Posts: 8,236
Default

Moved from Advanced Tech. More eyes in here.

The factory is saddled with not only trying to give their cars the best fuel economy possible, but also to have them emissions legal and made to last hundreds of thousands of miles.

A cam built around ideal fuel economy would be especially good in a narrower window of operation. Since your best V-8 fuel economy occurs under 2000 rpm, you would want to optimize the valve events to make your engine have the lowest BSFC in the 1200-2000 rpm range. Your mods and tune will play a big part in what those valve events are.

In general, an economy cam would have small duration like the stock cam, but more dynamic compression and more overlap (think narrower LSA and advanced intake centerline). Overlap will help fuel economy to a certain extent, but not emissions.
Patrick G is offline   Reply With Quote
Old 08-31-2007, 12:43 AM   #6
On The Tree
Thread Starter
 
Join Date: Feb 2006
Posts: 109
Default

Ok tanks Patrik G, that was what I was looking for.

//
tahoe is offline   Reply With Quote
Old 09-04-2007, 01:33 PM   #7
TECH Fanatic
iTrader: (1)
 
hammertime's Avatar
 
Join Date: Apr 2006
Location: Smithton, IL
Posts: 1,426
Default

Patrick,

I noticed a while back the new bit in your signature about tuning your Suburban for max fuel economy and power. Since you posted in this thread, I'm curious what kind of economy numbers you are achieving, and whether you think exhaust improvements, particularly LT's, might be of benefit to both.

Hammer

PS - to the original poster, sorry for the
hammertime is offline   Reply With Quote
Old 09-04-2007, 04:30 PM   #8
LS1 Tech Administrator
iTrader: (14)
 
Patrick G's Avatar
 
Join Date: Nov 2001
Location: Victoria, TX
Posts: 8,236
Default

Quote:
Originally Posted by hammertime
Patrick,

I noticed a while back the new bit in your signature about tuning your Suburban for max fuel economy and power. Since you posted in this thread, I'm curious what kind of economy numbers you are achieving, and whether you think exhaust improvements, particularly LT's, might be of benefit to both.

Hammer

PS - to the original poster, sorry for the
I've picked up 1-2 mpg with my tune in the Suburban, but the power increase is even more noticable. We're up to 286 rwhp with just a tune and airbox which is pretty good IMO. 1/4 mile times are a solid 5 tenths faster and mph is up 3. Headers would help power more than economy, but I'm sure they would pick up mpg's a little. Just not going that route with this vehicle. Quiet cruising is the name of the game.
Patrick G is offline   Reply With Quote
Old 09-04-2007, 07:29 PM   #9
TECH Apprentice
 
Join Date: Feb 2002
Location: Chicago; South Side
Posts: 366
Default

Got 23 mpg last tank. See mods below.
noah89 is offline   Reply With Quote
Old 09-04-2007, 07:38 PM   #10
LS1 Tech Administrator
iTrader: (14)
 
Patrick G's Avatar
 
Join Date: Nov 2001
Location: Victoria, TX
Posts: 8,236
Default

Quote:
Originally Posted by noah89
Got 23 mpg last tank. See mods below.
I was looking for a Suburban in your signature and was ready to throw out major props, but all I saw was a TA. 23 mpg is lower than stock (highway rating anyway). I average a few mpg better than 23 on the highway in my TA, but of course, I have a few more mods which probably helps.
Patrick G is offline   Reply With Quote
Old 09-04-2007, 07:43 PM   #11
Giggity Giggity
iTrader: (23)
 
brad8266's Avatar
 
Join Date: Aug 2005
Location: Watertown, NY
Posts: 8,797
Default

25-26 on the highway in the TA, 232/236 112 lsa cam.
brad8266 is offline   Reply With Quote
Old 09-04-2007, 09:23 PM   #12
12 Second Club
iTrader: (20)
 
ShortChevy's Avatar
 
Join Date: Jun 2007
Location: Muskegon, MI
Posts: 1,102
Default

Pretty sure he isn't talking about fbodys guys, he mentioned 5.3 in the OP and his name is tahoe...
ShortChevy is offline   Reply With Quote
Old 09-05-2007, 05:49 AM   #13
LS1 Tech Administrator
iTrader: (14)
 
Patrick G's Avatar
 
Join Date: Nov 2001
Location: Victoria, TX
Posts: 8,236
Default

Quote:
Originally Posted by ShortChevy
Pretty sure he isn't talking about fbodys guys, he mentioned 5.3 in the OP and his name is tahoe...
I was responding to Noah89, not to Tahoe.
Patrick G is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
4L60e power economy switch 32coupe Conversions & Hybrids 3 06-02-2015 05:03 PM
Fuel Economy Build mrarmyant Generation III Internal Engine 33 10-19-2014 10:12 PM
is it worth gong to 4.10's in cam only DD? 98BlackTransAm Gears & Axles 22 12-20-2011 12:44 PM
Block/Cam/Head Combos for 25hour Enduro Racing Steve Rea Road Racing 3 04-26-2005 01:14 PM
LS7 Fuel Economy WECIV Generation IV Internal Engine 24 01-21-2005 12:31 PM


Tags
00, cam, cams, denali, economy, efficiency, fuel, kind, lsa, milage, mileage, overlap, stock, tahoe, trans

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 05:22 AM.