383 Stroker Gas Mileage
05-28-2017, 12:24 PM
#21
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Search for threads started by me, download and read the tuning seminar.
Duke
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ndabunka (05-29-2017)
05-28-2017, 12:34 PM
#22
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If my 383 got 10-13 mpg highway, I'd figure I needed to change my driving habits or fix the engine.
383 and an Honest Charley camshaft does not have to make it a gas hog.
383 and an Honest Charley camshaft does not have to make it a gas hog.
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Johnny 66 (05-30-2017)
05-29-2017, 04:45 AM
#23
Drifting
05-29-2017, 09:50 AM
#26
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No he his just trying to tell people you can build a street engine with good manors have horse power and get decent gas millage. But a lot of people don't under stand this and put your hot rod Harry parts in it. Then complain about after they drive it. Duke has more years of experance on this then most on here. When he talks you should listen. He help me tremendously and made my car run much better and more enjoyable. 
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Tom Heffernan (05-29-2017)
05-29-2017, 09:56 AM
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St. Jude Donor '07
No he his just trying to tell people you can build a street engine with good manors have horse power and get decent gas millage. But a lot of people don't under stand this and put your hot rod Harry parts in it. Then complain about after they drive it. Duke has more years of experance on this then most on here. When he talks you should listen. He help me tremendously and made my car run much better and more enjoyable.
, mismatched 'add-on' parts can be nothing but trouble; especially in the 'hands' of a novice.I don't have his 'high falutin' degree, but I've been through the school of hard knocks.... I resent his condescending attitude; and, he has been wrong...
Bill
Last edited by wmf62; 05-29-2017 at 09:59 AM.
05-29-2017, 11:31 AM
#28
Safety Car
Too many people around here are stuck in 1970, others are stuck in 1962.
Hot Rod Harry 327, 485 HP, 200 ft-lbs @ 2000 RPM, 750 CFM DP, 248/256 duration, 3.70 axle, 215-70 radials, .67 O/D........25 MPG @ 75 MPH.
You old dinosaurs ought to actually build one THE RIGHT WAY and quit yer bullshlt.
Last edited by 65tripleblack; 05-29-2017 at 11:45 AM.
05-29-2017, 11:53 AM
#29
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St. Jude Donor '07
Too many people around here are stuck in 1970, others are stuck in 1962.
Hot Rod Harry 327, 485 HP, 200 ft-lbs @ 2000 RPM, 750 CFM DP, 248/256 duration, 3.70 axle, 215-70 radials, .67 O/D........25 MPG @ 75 MPH.
You old dinosaurs ought to actually build one THE RIGHT WAY and quit yer bullshlt.
Bill
05-29-2017, 11:55 AM
#30
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Too many people around here are stuck in 1970, others are stuck in 1962.
Hot Rod Harry 327, 485 HP, 200 ft-lbs @ 2000 RPM, 750 CFM DP, 248/256 duration, 3.70 axle, 215-70 radials, .67 O/D........25 MPG @ 75 MPH.
You old dinosaurs ought to actually build one THE RIGHT WAY and quit yer bullshlt.
the key to your success is OD most who complain still have 1:1
Last edited by Nowhere Man; 05-29-2017 at 11:55 AM.
05-29-2017, 01:07 PM
#31
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I re-geared my heavy 3800 lb '67 GTO for highway use and installed a 2.56 gear ratio. The car has a turbo 400 (this ratio wouldn't fly with a stickshift) trans, original 400 CID engine, original Q-jet, and original distributor with ignition points. This car, on the highway, consistently gets over 20 mpg at 75-85 mph....the usual is 21, and my best so far is 23 mpg when I kept it under 75 for a 100+ mile leg of a weekend trip. In town, not so much. For good gas mileage you need decent compression (the OP is leaving some power and economy on the table with 10:1 and aluminum heads), a matched camshaft and induction system(Holley's are great for power, kind of crude at metering for max economy), and a mapped out ignition curve with vacuum advance. With a 3.70 rear gear, my bet is that the fuel economy would go waaaay up if the cruising speed was held at 55-60 mph. Dropping in a 3.08 gear would help a bunch, too.
05-29-2017, 01:22 PM
#32
Team Owner
Why are you attempting to ruin things?
The best crowd that gathers to look at my cars, are usually when I am getting gas! The more stops the better!
It is like attending an impromptu car show at every fill up!
PS are you shifting to neutral to coast down the hills?
The best crowd that gathers to look at my cars, are usually when I am getting gas! The more stops the better!
It is like attending an impromptu car show at every fill up! PS are you shifting to neutral to coast down the hills?
Last edited by TCracingCA; 05-29-2017 at 01:24 PM.
05-29-2017, 01:25 PM
#33
Safety Car
Not quite.
So, let's level the playing field. I assume everyone here can do the math. If not, then here it is:
Fuel mileage is a direct proportion to engine RPMs at any speed
multiply 25 MPG by .67 to get the mileage at 1:1
answer: 16.75 MPG @ 75 MPH, 3.70 axle, 4th gear 1:1, HOT ROD HARRY 327 making 485 HP, 200 ft-lbs @ 2000 RPM, 750 CFM DP, 248/256 duration.
So, let's level the playing field. I assume everyone here can do the math. If not, then here it is:
Fuel mileage is a direct proportion to engine RPMs at any speed
multiply 25 MPG by .67 to get the mileage at 1:1
answer: 16.75 MPG @ 75 MPH, 3.70 axle, 4th gear 1:1, HOT ROD HARRY 327 making 485 HP, 200 ft-lbs @ 2000 RPM, 750 CFM DP, 248/256 duration.
Last edited by 65tripleblack; 05-29-2017 at 04:35 PM. Reason: should have read "485 HP", not 385
05-29-2017, 05:15 PM
#35
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OK, here's my real experience from Thursday. Did 282 miles on a road trip for the Veteran Home. I used 13.5 gallons of 89 octane = 20.8 mpg. The original (rebuilt with 115K miles now) engine...331ci 9.75 CR, 151 cam, Hedman headers, performance ignition, Edelbrock Performer intake, Edelbrock 625AFB, Muncie 3:36, and 215/70/15 tires. I cruise at approximately 2250=55, 2500=60, 2900=69. You can add performance partsand expect good performance with good gas milage. Dennis
Dennis
Last edited by Bluestripe67; 05-29-2017 at 05:56 PM.
05-29-2017, 06:13 PM
#36
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1970 350 LT-1 in my 61.. Getting 14-15 MPGs.
05-29-2017, 10:53 PM
#37
Burning Brakes
Mileage
I've got a 383 Stroker (10:1 with Dart heads) in my 66 with a properly tuned 650 Holley vacuum secondary carb and MSD Pro Billet ign system. I'm getting an average of 9/10 mpg on 93 non ethanol gas. I don't "punch" the car often and most cruising down the road is done at 3-35K. (370 rear end) Can anyone confirm that my mileage is in the ball park?
I was getting better mileage that that in my previous 427/425 matching numbers car
I was getting better mileage that that in my previous 427/425 matching numbers car
05-30-2017, 09:31 AM
#38
Burning Brakes
Thread Starter
Hot Cam Guy, I'd really appreciate hearing exactly how your 383 and holley is set up. Jetting, timing, vacuum or not etc. Your setup is exactly the same combination I am running on my 66. I tried to PM you but your inbox is full.
05-30-2017, 01:44 PM
#39
Instructor
05-30-2017, 03:13 PM
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Johnny 66 (05-30-2017)