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View Full Version : Your Induction system, heads, CIs, Cam, Compression, Trans, rear gear, exhaust- MPG.


BRUTAL64
04-18-2008, 10:42 PM
OK, me first:
Offy single plane dual quad intake with 500 Edelbocks.
401 ci
China Aluminum Heads - 195cc intake--TSCH Racing Heads- ported by me
ported Rams 2 1/2"exhaust with Pypes race pro mufflers
30 30 Fuelie cam
True static 11 to 1
Munice Wide Ratio
3.55 posi
14 to 17 mpg.

This should get interesting. Lets find out what combos get good Gas milage or bad Gas mileage.:drink:

Please try and get all the info requested in. If you don't know your MPG--guess-- you will have a good idea just by driving the car.:noworry:

The more engines I have here, the better the info it will supply. It does not matter what the your gas mileage is- all info will lead to good reference for future builds. At the end of this I will put all the info together. :goodevil:

84rzv500r
04-19-2008, 03:46 AM
Engine Name: Ram Jet 502
Engine type: Chevy big-block V-8
Block Part Number: 10237292
Block Type: Cast iron with 4-bolt main caps
Bore x stroke (in): 4.47 x 4.00
Camshaft duration (@.050 in): 224 degree intake / 234 degree exhaust
Camshaft lift (in): .527 intake / .544 exhaust
Camshaft Part Number: 12366543
Camshaft type: Hydraulic roller
Compression ratio: 9.6:1
Connecting Rod Part Number: 10198922
Connecting rods Type: Forged steel, shot peened
Crankshaft Part Number: 10183723
Crankshaft Type: Forged steel
Cylinder head Part Number:12363390
Cylinder head Type: Aluminum oval port; 110cc chambers
Displacement (cu in): 502
Distributor Part Number: 1104060
Distributor Type: HEI
Ignition timing: 8 degree BTDC @ 800 rpm; 36 degree total @
Maximum rpm: 5800
Piston Part Number: 12533507
Pistons Type: Forged aluminum
Recommended fuel: 92 octane
Rocker arm ratio: 1.7:1
Rocker arms Part Number: 12368082
Rocker arms Type: Stamped steel
Valve size (in): 2.25 intake / 1.88 exhaust; stainless steel
Water Pump Part Number: 14058915
Water pump Type: Aluminum, short-style
Fuel Injection: Ram Jet MEFI 4 Injection 38#/hr Injectors
Throttle Body Part Number: 17113524
Flywheel: GM Nodular Iron 15#
Flywheel Part Number: 14095987
Clutch: Center Force Dual Friction
Transmission: 7021626AK, GM 1 1/8-26 Spline Special Heavy Duty 9 DP Road Race 6th Gear Sets, 450 Ft. Lbs.
Transmission Ratios: 3.28, 2.14, 1.57, 1.24, 1.00, 0.80
Final Drive Ratio 3.08:1
Car Wt with driver and full fuel: 3250 Lbs.

Estimated MPG Street 15, Race <10

Wesch
04-19-2008, 09:46 AM
Hi

427 CI 4 bolt main BB .030 " over
L71 solid lifter square port heads
compression a touch over 11:1
original L71 solid lifter cam shaft
435 HP tripower induction
GM t56 Viper 6 speed tranny
center force double friction clutch
4.11 rear posi
min 18 Liter/100 KM , max around 35 Liter ( about 13 Miles/Gal min, max up to 7 Mil/Gal. )
alu radiator with double electric cooling fan
engine oil cooler temp controlled
ignition timing max 36 , with vacuum up to 52
red line RPM 6500
drivetrain still on original rear 7 leaf Gymkana steel leaf spring ( to keep some weight on the aft axle for acceleration )

Günther

SmokeyVette
04-19-2008, 02:25 PM
All pertinent information is listed below.

I've seen 20mpg on the highway, and as good as 14mpg in town, but she usually gets around 9-11 in town because I can't keep my foot out of the carb.

SMYDA
04-19-2008, 02:30 PM
This should get interesting. Lets find out what combos get good Gas mileage or bad Gas mileage.:drink:

:bounce:
I'm very interested in seeing the results to this thread.............want a performance engine
in the son's Vette but don't want the mileage to go to crap in the process either.

GEE
04-19-2008, 06:11 PM
four dcoe 45mm webers on a moon ir crossram feeding afr's ,,,,,,,,,,,,, no comment on the mileage due to lack of self control .:rolleyes:

BRUTAL64
04-20-2008, 04:58 AM
four dcoe 45mm webers on a moon ir crossram feeding afr's ,,,,,,,,,,,,, no comment on the mileage due to lack of self control .:rolleyes:

Can you give us a guesstement? This is about gas miliage. I just paid 4 dollars a gallon tonight.:amazed:

GEE
04-20-2008, 10:28 AM
I,m pulling a 3:7 gear with a tremec 3550 so a guesstimate based on behaviour would give about 14/15 mpg .

GEE

tonyv123
04-20-2008, 02:45 PM
Daily driver, ZZ4, 4spd., 3.54 rear, stock exhaust w/o cats, stock 255-60-15's.

Every tank full, I get 12 to 14 MPG. I can see a Shell gas staion from here, today it's $4.18 Premium.

White76
04-20-2008, 04:27 PM
Modified ZZ4:
GM's roller "hot cam" - 0.545"/0.545" lift
Ported ZZ4 heads with Manley valves & springs
Moroso aluminum waterpump
Roller rockers
HEI w/ MSD module & coil
BG 650 mech. secondary
1/2" four hole spacer & Moroso drop base air cleaner
Canton road race oil pan & windage tray
Stock powersteering pump, mech. fan, and alt.
Dynomax headers, duals, and Borla mufflers
Richmond 5 speed
3.08 rear gears
17x8" wheels with 235/50/17 tires

Gas milage: 16-19 mpg

Stroker-427
04-20-2008, 09:06 PM
Motown 427 Small Block
Dart PRO1 227 CNS heads
Edelbrock Victor Jr. (ported)
Crane solid roller 256 - 264 @ 0.050" - 108 LSA
Crane Shaft roller rockers
Mighty Demon 850 CFM annular discharge
MSD Pro Billet distributor
MSD 6AL
Moroso Vacuum Pump

You guys says 4$ per gallon is a lot???
Here in Italy we pay 1.4 Euros per liter !!!! (more than 2.2 $ per iter):banghead:

...so.... I realy don't care mileage...... I only care to drive as fast as possible between the gas stations!:rolleyes:

Twin_Turbo
04-20-2008, 09:21 PM
I paid 1.575 Euros a liter today :bomb::sweat::twitch::suicide: That's what, right around $9.60 a gallon?

That's with the euro costing 1.56? dollars roughly. When the dollar goes up we're REALLY screwed. I'm now going for smiles per gallon instead of miles per gallon.

Nice combo you have there Pier Paolo.

I have trick flow G1 heads, custom crossram w/ 4 dellorto DHLA45M Tri Jet Pressure carbs.

Stroker-427
04-20-2008, 09:27 PM
Thanks Marc..... in the next days I will tell you how it is!

....I have completed the engine today, now I need to put it in the bay!

Twin_Turbo
04-20-2008, 09:56 PM
pics please :)

Stroker-427
04-20-2008, 10:22 PM
OK.... tomorrow I will take some pics!

BRUTAL64
04-21-2008, 06:12 PM
Guys, don't forget to put your Compression Ratio in.

As this goes on, I think this will be very enlightening.:drink:

kwplot34
04-21-2008, 06:48 PM
388 ci
Brodix IK200 heads,ported & polished
Brodix Bracket HV1015 intake,ported & polished
725 Demon carb
6al ign box,msd pro billet diz,blaster HVCII coil
Howards roller cam,230in/230ex,lift 510in/510ex, 108lc
11:1 cr
VP110 fuel
BW M21 trans,3:70 rear gears
2 1/2" true duals,flowmaster flo-pro 40 series,dynomax headers
MPG, somewhere around 10-12 mpg

BRUTAL64
04-21-2008, 07:03 PM
388 ci
Brodix IK200 heads,ported & polished
Brodix Bracket HV1015 intake,ported & polished
725 Demon carb
6al ign box,msd pro billet diz,blaster HVCII coil
Howards roller cam,230in/230ex,lift 510in/510ex, 108lc
11:1 cr
VP110 fuel
BW M21 trans,3:70 rear gears
2 1/2" true duals,flowmaster flo-pro 40 series,dynomax headers
MPG, somewhere around 10-12 mpg

This is for me, what is your bore and stroke combo? Thanks.:beer:

Stroker-427
04-21-2008, 08:55 PM
As I promise, some pics of my new engine!

.... compression ratio?

12.5 : 1 :thumbs:



93

94

95

96

kwplot34
04-21-2008, 10:32 PM
This is for me, what is your bore and stroke combo? Thanks.:beer:

You are going to make me put on my thinking cap now.
but i believe this is what i have.
4.060" bore
3.75" stroke

Jupiter60
04-22-2008, 07:58 PM
1 piece rear 350, 60 over, 9.5:1 compression, LT4 roller cam, Vortec heads, Performer intake with AFB 4 barrel, long tube headers, 2 1/4 exhaust, 1992 Camaro T-5 with 3:08 rear, hardtop on. 21 mpg highway.

Speedometer and Odometer is not currently functional in the 1975 Corvette. To test the mpg I followed my girlfriend who was driving my 2006 Ford F150 from my parents house back home. We filled both cars and drove directly home. The drive was a little over 150 miles. She lead the way and set the cruise at 75 mph. It took right around 7 gallons. I have done the trip on other occasions and by the look on the gas gauge it appears that it can actually get more mpg if the gauge is accurate. City is much different. Also, there is no engine driven cooling fan. I have an electric fan with shround from a Mercury something, looked like a Taurus. Early 90's model.

BRUTAL64
04-22-2008, 08:50 PM
1 piece rear 350, 60 over, 9.5:1 compression, LT4 roller cam, Vortec heads, Performer intake with AFB 4 barrel, long tube headers, 2 1/4 exhaust, 1992 Camaro T-5 with 3:08 rear, hardtop on. 21 mpg highway.

Speedometer and Odometer is not currently functional in the 1975 Corvette. To test the mpg I followed my girlfriend who was driving my 2006 Ford F150 from my parents house back home. We filled both cars and drove directly home. The drive was a little over 150 miles. She lead the way and set the cruise at 75 mph. It took right around 7 gallons. I have done the trip on other occasions and by the look on the gas gauge it appears that it can actually get more mpg if the gauge is accurate. City is much different. Also, there is no engine driven cooling fan. I have an electric fan with shround from a Mercury something, looked like a Taurus. Early 90's model.

So, maybe 20-21 or more mpg. That's really good. :thumbs:
When you say AFB do you mean a real Carter or Edlebrock Performer?:bump:

JPhil
04-22-2008, 09:42 PM
350" SBC, Q-jet through Weiand 8000 manifold into AFR 180cc street heads w/72cc chambers, 9.75 static compression, CC XE262 (218*@.464" I & 224*@.472") w/114* LSA, 1 5/8" headers, 2 1/2" undercar exhaust w/X-pipe. Turbo 400 w/2000 stall, 3.36 rear gears.

85 octane, 5000+ feet elevation.

15+ MPG in combination driving, I'd say 60% city, 40% highway

Sure would like a .82 TKO 600.

BRUTAL64
04-22-2008, 10:56 PM
350" SBC, Q-jet through Weiand 8000 manifold into AFR 180cc street heads w/72cc chambers, 9.75 static compression, CC XE262 (218*@.464" I & 224*@.472") w/114* LSA, 1 5/8" headers, 2 1/2" undercar exhaust w/X-pipe. Turbo 400 w/2000 stall, 3.36 rear gears.

85 octane, 5000+ feet elevation.

15+ MPG in combination driving, I'd say 60% city, 40% highway

Sure would like a .82 TKO 600.

The Road Race Tranny? My, thoughts also. Just not sold on it yet.:nuts:

JPhil
04-22-2008, 11:19 PM
I'm sold on it, just can't afford it. That's actually what I built the rest of the drive train around. I have a pretty wide, flat torque band (114* LSA is good for that) so I could run wider ratios, but I like the idea of a choice of gears at any speed. From canyon carving to flat out Wyoming running. If I remember right, with the 3.36 diff, I'd have a 9.84 first gear & 2.75 top gear. That works!

BRUTAL64
04-23-2008, 03:39 PM
I'm sold on it, just can't afford it. That's actually what I built the rest of the drive train around. I have a pretty wide, flat torque band (114* LSA is good for that) so I could run wider ratios, but I like the idea of a choice of gears at any speed. From canyon carving to flat out Wyoming running. If I remember right, with the 3.36 diff, I'd have a 9.84 first gear & 2.75 top gear. That works!

I'm considering the RR tko600-mainly that I don't need a 200+mph top speed. I use all my RPM and the .87 fits my needs better. But, the price of install and the negative input I keep reading, makes me think there might be a "better" way to go.:drink:

Billsvette
04-23-2008, 07:43 PM
383 stroker
hydraulic roller cam
edelbrock victor 215 runner heads
weiand polished blower
holley blower carb-D ,pumper 750 cfm
hooker super comp headers
aluminum flywheel and richmond t10 trans
3:55 rear
etc.

BRUTAL64
04-23-2008, 08:22 PM
383 stroker
hydraulic roller cam
edelbrock victor 215 runner heads
weiand polished blower
holley blower carb-D ,pumper 750 cfm
hooker super comp headers
aluminum flywheel and richmond t10 trans
3:55 rear
etc.

MPG?:bounce:
Blower size and boost?:bump:
Thanks.

1981Z06Vette
04-24-2008, 03:26 AM
LT1 383- 4.030 bore x 3.75 stroke Eagle crank, Wiseco pistons, Scat rods
LT1 intake, ported by Lingenfelter
LT1 CNC ported stock aluminum heads, 2.0 and 1.60 valves, also by Lingenfleter
12.3:1 (gotta love reverse cooling!) :drink:
Gallant Technical Performance GTP6 .568/.592 236/242 112 lsa (with 1.6 rockers)
T56
4.11
undecided-car not finished yet...likely Hooker Supercomps LT headers, 3" duals w/x-corssover and Borla XR1s
got 25+ MPG HWY with same combo on stock bottom end 350 LT1

BRUTAL64
04-24-2008, 05:23 PM
LT1 383- 4.030 bore x 3.75 stroke Eagle crank, Wiseco pistons, Scat rods
LT1 intake, ported by Lingenfelter
LT1 CNC ported stock aluminum heads, 2.0 and 1.60 valves, also by Lingenfleter
12.3:1 (gotta love reverse cooling!) :drink:
Gallant Technical Performance GTP6 .568/.592 236/242 112 lsa (with 1.6 rockers)
T56
4.11
undecided-car not finished yet...likely Hooker Supercomps LT headers, 3" duals w/x-corssover and Borla XR1s
got 25+ MPG HWY with same combo on stock bottom end 350 LT1

25+! Show off.:drink:

big_G
04-24-2008, 05:49 PM
383 SBC
ProCharger centrifugal s/c model D1SC
Scat 4340 crank
Eagle h-beam rods with ARP L-19 rod bolts
Edelbrock Vic. Jr. heads and intake
Holley 750 d/p modded for blow-thru s/c
J-E forged dished pistons, approx 8.3:1 scr
Comp. Cams solid roller cam 242-248, 110 lsa
EndureX roller lifters (pressurized pin oiling)
Comp pro-magnum roller rockers
Centerforce 2 clutch, Lakewood blow-shield housing
with block plate
Richmond 5-speed trans., 3.08 rear end gear
3 in. exhaust w/Hooker MaxFlow mufflers
Aeromotive A1000 fuel system w/ cruise (reduced) voltage control
Only dyno #'s so far are 492 RWHP , 539 RWTQ @ 4,600 rpm. Big time blower belt slippage starting around 8 lbs. boost so I shut her down at 5,000 rpm's.
MPG's...single digits.

BRUTAL64
04-24-2008, 06:15 PM
383 SBC
ProCharger centrifugal s/c model D1SC
Scat 4340 crank
Eagle h-beam rods with ARP L-19 rod bolts
Edelbrock Vic. Jr. heads and intake
Holley 750 d/p modded for blow-thru s/c
J-E forged dished pistons, approx 8.3:1 scr
Comp. Cams solid roller cam 242-248, 110 lsa
EndureX roller lifters (pressurized pin oiling)
Comp pro-magnum roller rockers
Centerforce 2 clutch, Lakewood blow-shield housing
with block plate
Richmond 5-speed trans., 3.08 rear end gear
3 in. exhaust w/Hooker MaxFlow mufflers
Aeromotive A1000 fuel system w/ cruise (reduced) voltage control
Only dyno #'s so far are 492 RWHP , 539 RWTQ @ 4,600 rpm. Big time blower belt slippage starting around 8 lbs. boost so I shut her down at 5,000 rpm's.
MPG's...single digits.


Damn! I've always liked Forced Induction. I would think, with a little fine tuning-and keeping your foot out of it-you could get 12mpg.:suspicious:

mrvette
04-24-2008, 07:35 PM
I have stayed off this thread because I honestly didn't know what mileage I get.....but went on a trip to Gainsville and back, non car related, and so know I used about 7.2 gallons in 170 miles cruising at 60-80 all the way....some lights, some small town crap....

engine is a LT1 induction on L98 aluminum heads 10.5-1 comp, on a stockish '89 truck block 350 bored 30 over TRW flat top 4 brow pistons, tranny is a 200 4r with trans go kit, and a 336 rear, brakes are Oring so the car will coast outta my garage, it's just a drainage slab, nothing great....
rack steering and garage alignments by me.....275/50/17 in rear and 255/50/17 in front...anyone can see the pix, but most of you have, I suspect...nothing new...

the car got 24.6 mpg on the 170 mile trip above, and gets about 15-16 around town, IF I keep my toezzies out of the air valve....

:D:ghost:

Oh, i'ts a '72 vert weight 3300 lbs....

I drive top down, most ALL the time....I put on my funky sailing hat with chin strap, wife HATES it, cause it's not 'cool'.....at age 64 I"m entitled to look wacky....f'em all.....


:crutches::hi:

SmokinBBC
04-24-2008, 11:38 PM
454 .030 over 532tqe/462hp at the crank
"Stock" 290 heads with mild porting
Manley Valves, Keepers, Retainers
Stock intake manifold
Stock Exhaust manifolds
Stock Qjet
Scat crank forged
Scat Rods forged
SRP Pistons forged
Speed Pro Rings
Coated ACL-H main and rod bearings
Coated Duro Bond Cam Bearings
Roller Cam .569/.569 280/292 224/234@.050 111LSA
Morel Hyd Roller Lifters


MPG=0 Haven't driven it a mile yet:D


In pure stock form, it got between 13 and 15..depending on "driving habits"

edit: Getting 13-15 around town and 17 on the highway.

BRUTAL64
04-24-2008, 11:46 PM
454 .030 over 532tqe/462hp at the crank
"Stock" 290 heads with mild porting
Manley Valves, Keepers, Retainers
Stock intake manifold
Stock Exhaust manifolds
Stock Qjet
Scat crank forged
Scat Rods forged
SRP Pistons forged
Speed Pro Rings
Coated ACL-H main and rod bearings
Coated Duro Bond Cam Bearings
Roller Cam .569/.569 280/292 224/234@.050 111LSA
Morel Hyd Roller Lifters


MPG=0 Haven't driven it a mile yet:D


In pure stock form, it got between 13 and 15..depending on "driving habits"

Compression Ratio? Thanks.:bounce:

SmokinBBC
04-25-2008, 12:08 AM
Compression Ratio? Thanks.:bounce:

10.7:1
M20 with 336 rear

BRUTAL64
04-25-2008, 03:29 PM
10.7:1
M20 with 336 rear


Thanks.:drink:

Jupiter60
04-25-2008, 06:25 PM
I am using a newer stye Edelbrock AFB style. I am sure I could get a littel bit more mpg. I haven't even gotten this thing aligned in the 3 years I have been driving it.

Gene
Do you have any inforation on your LT1 intake conversion?

TimAT
05-02-2008, 07:45 AM
Ol' Red

454 LS-7 block and guts.
4.25 bore x 4.00 stroke
GM "077" Aluminum heads 2.19 Intakes and 1.88 Exhaust 119cc Open Chambers rectangle ports
LS-7 Rods with ARP 7/16 bolts
Pistons GM 3976014 12.25:1 compression
Cam ZL-1 3959180 - .560I/.600E Lift .262I/.273E Duration @ .50 lift
7/16 pushrods and guideplates.
GM 3933163 Intake
750 Holley DP
GM TI Distributor with Summit (Mallory) CD box w/ rev limiter
Hooker 2-1/8 primary sidemount headers with STS Baffles
M-21 Close Ratio 4 speed
4.11 rear gears with 25" tall tires

gas mileage = not much (I never figured it) (my bad)

mrvette
05-02-2008, 12:56 PM
I am using a newer stye Edelbrock AFB style. I am sure I could get a littel bit more mpg. I haven't even gotten this thing aligned in the 3 years I have been driving it.

Gene
Do you have any inforation on your LT1 intake conversion?

Well, I dunno if I typed that correct or not....LT1 to ME is the later DPFI engine/induction not the early 70's carb thing....

I have had DPFI on there for some 13 years now, one of the first things done well before the overdrive, as I was up north then in the Wash DC region....

the only bolt on to the original L48, was the L98 setup, and so it got 24 mpg with the muncie...336 rear same in there now....

after having a hotrod 355 roller engine built, I swapped it out some 11 years ago down here, with a o/drive automatic 700 and later swapped tranny to a 200 4r which is much more suited to the car....

I currently have later aluminum L98 heads on it, and so when ditching the L98 setup I put on a highly modded LT1 intake, last winter's project....

the intake takes a LOT of modifying to get it to fit....need a lot of TIG welding, and machine work...but when done, it's SO much simpler to work with

:bounce: