Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 04-15-2002, 11:28 AM
brunobus_36's Avatar
brunobus_36 brunobus_36 is offline
Inactive User
 
Join Date: Apr 2002
Location: Watertown SD
Age: 38
Posts: 19
Default what kind of gas mileage does a 380hp crate motor get

i am looking into buying a 380hp crate engine but i'm concerned about fuel economy........if you guys that already have this engine could tell me what you car you have it in and what kind of mileage it gets that would be great!!!!

thanks

bruno
Reply With Quote
  #2  
Old 04-15-2002, 11:37 AM
Mills Mills is offline
Inactive User
 
Join Date: Aug 2001
Location: Calgary, AB, Can
Age: 44
Posts: 258
Default

If you are buying the 380 HP crate engine, why do you care? I didn't think too many people are concerned with mileage when buying or building a "killer" motor.

Mills
Reply With Quote
  #3  
Old 04-15-2002, 11:41 AM
brunobus_36's Avatar
brunobus_36 brunobus_36 is offline
Inactive User
 
Join Date: Apr 2002
Location: Watertown SD
Age: 38
Posts: 19
Default

i am planning on it being my daily driver and if it doesn't get decient economy, then i will have to go with a different engine

bruno
Reply With Quote
  #4  
Old 04-16-2002, 12:05 PM
rumblefish360's Avatar
rumblefish360 rumblefish360 is offline
Moparchat Bronze member
 
Join Date: May 2000
Location: C
Age: 57
Posts: 11,120
Default

There was a fella here from NYC that has one in his Cud, '73 I think it was. Motorv8n was his screen name Hasn't been here in a while.
He said 17mpg's in a 4spd car w/ stock tires. If you know what a stock Cuda tire is, it's small.
I think he was running a 225/60/14. That should be real, real close to stock.
Sorry, I can't tell ya about mine. Broken speedometer. But , from fill up to fill up, it's not to bad.
Reply With Quote
  #5  
Old 04-16-2002, 02:23 PM
360 Coronet's Avatar
360 Coronet 360 Coronet is offline
Inactive User
 
Join Date: Aug 2000
Location: Houston, Texas, USA
Age: 41
Posts: 146
Default My bud...

He has a '68 Dart GTS w/Crate 360/300.

He gets between 12-17 miles per gallon.
Reply With Quote
  #6  
Old 04-16-2002, 02:59 PM
goose's Avatar
goose goose is offline
Registered User
 
Join Date: Jan 2001
Location: Arkham Asylum
Posts: 490
Default

Your mileage will depend greatly on things other than the engine, such as car weight, gear ratios, transmission type, and carb tuning. If you used a manual transmission with an overdrive and your carb wasn't jetted for full-race you could probably expect to see a little over 20 mpg, depending on final drive ratio. A 3-speed auto with 4.10's would probably not get much more than 12-13 mpg (both figures are highway). If you want both performance and mileage, you need an overdrive. Manual trannies give better economy but OD trannies are either spendy (aftermarket 5 speed) or marginal performance (stock Mopar 3+1). The 4-speed autos used in the late model trucks are a good choice because they bolt up to any smallblock and ma produced quite a few of them. I would expect you could get right around 20 mpg with the 4speed auto.
Reply With Quote
  #7  
Old 04-16-2002, 05:55 PM
mtrv8n mtrv8n is offline
Inactive User
 
Join Date: Jul 1999
Location: new york city
Posts: 904
Default

Wow, what a coincidence... Its' me, MTRV8N!
Yes, with the edelbrock carbs, which are not true doulbe pumpers, I've been getting 17-18 MPG overall, as long as I don't give in to those urges. When I do, I can watch the gas drain from the tank..almost in minutes..

The bottom line is, if you drive this motor hard, it will eat gas..measured in gallons per mile. On the highway, just cruisin, it's fairly decent if you gear it high enough. I've got 3:23 gears and 24.5 inch tires with the standard A833 tranny. Cruisin at 60 = about 2700 rpm. If you want better economy, gear it up or put bigger tires on, lower the rpms(this motor does have torque from about 1500 rpm on up..). I must caution you that driveabitlity will suffer..
Reply With Quote
  #8  
Old 04-16-2002, 07:33 PM
brunobus_36's Avatar
brunobus_36 brunobus_36 is offline
Inactive User
 
Join Date: Apr 2002
Location: Watertown SD
Age: 38
Posts: 19
Default

what do you mean by driveability will suffer??

bruno
Reply With Quote
  #9  
Old 04-17-2002, 07:15 AM
Fast One Fast One is offline
Inactive User
 
Join Date: Dec 2001
Location: Adelaide South Australia
Age: 66
Posts: 329
Default

I haven't got one but Mopar says it has a 288/292 duration cam which is reasonably healthy, if you have a lot of driving to do or heavy traffic situations I'd be inclined to look at something else.

I have a 360 at the moment using the 292 / .508 lift cam, great for weekend driving & cruising but I couldn't imagine using it for driving to work every day, of course if work isn't far away what the heck !!

Maybe a 318 with a mild cam would do you, smaller engine gets that nice lopey cam sound with a smaller cam fairly easy, meaning, a big cam in a smaller cubic inch engine becomes smaller so to speak when swapped into a bigger cubic inch engine.

My line of thought is to use a mild 318 which should be lighter on the fuel & will perform pretty sharp with the right mods, plus still sound nice..
Reply With Quote
  #10  
Old 04-17-2002, 07:35 AM
DartByU's Avatar
DartByU DartByU is offline
Inactive User
 
Join Date: Oct 2000
Location: Silverhill, Al
Posts: 383
Default

I had a 318 in my Dart a long time ago with a 600 Holley,Edelbrock streetmaster intake,Erson 292 cam and a 2500 stall torque converter with 3.23 gears and I could get 20 MPG on the hwy. about 12-14 city and that combo would run the 1/8" mile at about 9.10@78 MPH.
Reply With Quote
  #11  
Old 04-17-2002, 10:10 AM
brunobus_36's Avatar
brunobus_36 brunobus_36 is offline
Inactive User
 
Join Date: Apr 2002
Location: Watertown SD
Age: 38
Posts: 19
Default 360 vs 318

what is the difference between the 360 & 318 besides displacement.........i heard that they have the same block.
which engine and mods do you guys think would give me a good mix of economy and performance.

bruno


PS. the car it'll be going in is about 3400lbs.
Reply With Quote
  #12  
Old 04-17-2002, 12:50 PM
rumblefish360's Avatar
rumblefish360 rumblefish360 is offline
Moparchat Bronze member
 
Join Date: May 2000
Location: C
Age: 57
Posts: 11,120
Default OH-MY! Speak of the devil and he arrives! Eeeek! Mtrv8n, wuz up!

The 318 is internally balanced------360 --extranal.
" " has smaller mains " " Larger mains.
" " shorter stroke & bore " " Bigger stroke & bore
The 318 reacts wilder, with a said cam than a 360 w/ same cam
"360 " acts mello with same cam as used in the 318
This is due directly to the extra 42 cubes.
"318 "lacks torque, small stroke.
"360" has more due to larger stroke.
The 318 will rev faster than the 360 due to shorter stroke and make peak power higher due to shorter stroke. This would be even more true or easier to compare if it were the same cid engine with different bore and stroke combos.
Kind of like the diff between the "B" engine 383 and the 1 year only "RB" 383. It will be less evadent between the 2 due to the 42 cubes.
Engine mounting is different on the driverside only. They need there own mounts.
Reply With Quote
  #13  
Old 04-17-2002, 01:03 PM
rumblefish360's Avatar
rumblefish360 rumblefish360 is offline
Moparchat Bronze member
 
Join Date: May 2000
Location: C
Age: 57
Posts: 11,120
Default

A good mix of economy and performance will vary with opions and how one veiws what they are.
EX;

1 Fella I know thinks that a 9.5-1, 360 4bbl engine with stock 340-360 4bbl cam, 2.02 w/mild port work done and 1.6 rockers and headers will meet his needs on HI-performance. I think thats a great combo. I'm thinking of doing it myself. Sounds good for every day performance ride. Nothing radical.
A stock 340 produced good HP. now add 20 hp for port work and 10% on top with headers. (Guesstamite figures)
A swap to a purple 280 cam still keeps it mello enuff to drive. But you'll need to change torque converters.

Then again, some feel there create motor is the cats PJ's. And thats fine to. For them it is and they won't complain.
Re read Mtrv8n's post. Not bad mpg's. He said that a bigger tire will have it suffer a bit. That would be for the "Off the line performance."
On the otherhand, it will decrease cruising RPM's and increase top end. Going 2 inchs on tire height is a real lot. There will be a diff you can't miss.
If you went from a 24.5 to a 27 inch tire, you might think the cars a dog out of the hole. It just might be. But just wait till your in 4 with the hammer down. It'll seem like it has no end in energy as you accel past 80mph.

I like fig 1 without the cam change. 1 day i just might get there.
Reply With Quote
  #14  
Old 04-17-2002, 06:17 PM
Fast One Fast One is offline
Inactive User
 
Join Date: Dec 2001
Location: Adelaide South Australia
Age: 66
Posts: 329
Default

Everyones expectations & needs with a street performance engine vary so it's a 6 of one or half a dozen of the other, I'd be brave enough to say that a 318 with the right combination of parts & diff ratio / exhaust / tire size would give any modern fuel injected Furd or Chebby a reasonably hard time.

I used to be a sales rep & the car I used was a 318 with a mild cam, did a great deal of driving every week, city & country, kept me pretty happy.

At the time my after hours car was a 360 with a smallish cam ( Crane 272 advertised duration / .454 lift ) & Holley 600 , slight lope in idle with 3.23 gears, would light the tires up very easy, well almost too easy, was a delight to drive in any traffic, the 318 had the edge in economy but the 360 had awesome torque, both engines had their merits, think at the end of the day the 360 was my favourite driver.
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
380hp Crate cam Aspen77RT Performance Talk 1 08-08-2006 01:37 PM
380HP crate or 340 TrxR Performance Talk 5 08-14-2002 12:57 AM
360-380hp crate motor timing wvmopar Performance Talk 6 10-03-2000 09:35 AM
440 sixpack or 380hp 360 crate 40Coupe Performance Talk 8 01-14-2000 07:01 AM
magnum 380hp crate motor IRON MIKE Performance Talk 11 08-19-1999 08:25 AM




All times are GMT -4. The time now is 09:35 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .