gas milage... - Team Camaro Tech
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post #1 of 7 (permalink) Old Apr 21st, 00, 07:29 AM Thread Starter
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Join Date: Nov 1999
Location: brandon, ms. usa
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i filled up today expecting to drive my 150 miles and have to put a full tank in. speedo is about 5-10% under and my gas gauge isn't working. so with my average of about 10 mpg i usually stick about 16 gals in. well, i got 2 pleasant surprises. 93 octane had gone down to $1.61.9 (still sucks) and the pump stopped at 11.5 gals. this is the first time i filled up since i installed Dave's new small body hei unit, reset the timing and took out the old splitfires @ .33 gap and put in autolights at a .44 gap. the car wasn't running bad before, but this turns out to be about 13 1/2 mpg. do you think these changes could account for a 3 1/2 mpg increase or am i jumping the gun and need to try to get a few more miles in before i go to bragging about my miserable fuel economy?


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[This message has been edited by mike brown (edited 04-21-2000).]
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post #2 of 7 (permalink) Old Apr 21st, 00, 05:05 PM
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Location: Abilene TX, USA
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Mike, I've been thinking of putting in an hei on my 67 but have been reading all the post about beating up the firewall and really don't want to do that. Is yours the same size as the stock distibutor and if so, where can I get one and how much will it set me back. I've read and seen other post about improved gas mileage with a good hei, most of them I've seen seem to be in the 2 mpg range.
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post #3 of 7 (permalink) Old Apr 21st, 00, 05:34 PM Thread Starter
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small body hei - stock point dist. converted to a hei module that uses an external coil. you can hardly tell it from the stock dist., the only dif is the hei module is mounted under the dist. plate on the pass. side and you really have to look to see it. these are all build to order. unless he has one in stock, you will have to supply the core. i ordered mine when he was very busy and turn around time was 4-6 weeks. may be better now.
Dave Ray
DAVE's small-body HEI.s
11605 Waddell street
Whittier, California, 90606
(562) 699-6949
(562) 695-9199 (Fax)
[email protected]
be sure i tell him i sent you.


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post #4 of 7 (permalink) Old Apr 30th, 00, 08:32 AM Thread Starter
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filled up again today. gas had gone down to $1.52 9/10 for 93 and still figures at +13 mpg. dist. should pay for itself over the summer.
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post #5 of 7 (permalink) Old Apr 30th, 00, 08:37 AM
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Location: Whittier, California
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YUP. Giving proper curves and better spark usually gives better fuel results.

Your' seems to have responded well, Mike.

Sounds like you got the starter problem resolved, too.

Old hot-rodder adage: "Weak spark likes rich mixtures". Better spark, gives jetting ability that wasn't there previously.

Enjoy!
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post #6 of 7 (permalink) Old Apr 30th, 00, 09:26 AM
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i have been battling bad milage all winter also. I dont have a much for economy (street built 350 in a 81 f-bird)and was getting about 8 mgp in the city, 16 high way And have got a few good results.
heres what i did.....

Bought a new hei, recurved with the lighest springs, accel coil and cap


Rebuilt my performer carb and used the proper jets and metering rods for 6000 ft alt where i live. I found the info at the edelbrock web site.

put in a posi 3.42 10 bolt z-rear end, i was running 2.72? highway gears that were unbearable, since I do 90% of my driving in the city this HELPED ALOT. i seem to get about the same milage when i get on it hard as when i go easy,and my secondaries work much beter.

i went with a RPM cluch fan in place in place of my old cheepo flex fan. I seen in car craft test that it would free up around 20 hp at idle and 40 at 5500rpm (only 2hp less than a electric and much cheeper). and since i have a new 4 core radiator and live in the mountians it never has never got over the 185" mark.

now i get about 15 mpg consistantly(and i drive it like i stole it.) in the city and highway .Its also much faster iam going to rebuild the exhaust next.
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[This message has been edited by will stefan (edited 04-30-2000).]
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post #7 of 7 (permalink) Old May 2nd, 00, 10:21 AM
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Will, what kind of clutch and fan did you use. I was thinking about changing mine too. I currently have the stock setup in a 67 w/327 is yours something I could get at a junk yard or cheaply at a parts store.
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