302 from '71 vs 302 from'75?

Discussion in 'General Maverick/Comet' started by benben, Aug 13, 2004.

  1. benben

    benben Member

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    Now when I have the Haines manual I´ve notice in the engine hp table the year 71 have 210 hp and '75 only 115/122 hp. Question: what is the different in this motors (read, how can I put this 210 hp in my motor) :confused:
     
    benben, Aug 13, 2004
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  2. don graham

    don graham MCG State Rep

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    i don't remember which year it was but they started rating them differently. they used to go with hp measured at the flywheel. they then changed to hp measured at the rear end.:) plus i'm sure the emissions played a part in that game too. i think the easiest way to get a hp gain without a lot of mods is to change the cam and pistons, plus the intake and carb, after that i'd work on the ignition and distributor system.
     
    Last edited: Aug 13, 2004
    don graham, Aug 13, 2004
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  3. benben

    benben Member

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    Aaa, ok! So then I think ET in 18,069 is ok = 100,3 hp from rear end (by the calculator, speed, weight and ET time) this 15 or 22 hp is in the transmission then. Am I write?
     
    benben, Aug 13, 2004
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  4. Charlie

    Charlie maverick.to/grabber

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    No, it is not horsepower measured at the rear end.

    1971 is Gross Horsepower, 1972 and up is net. This just means that 1971 and earlier, they measured horsepower with no accessories, open exhaust, open carb, fresh air, etc. In 1972 they started rating them as net. With all the accessories, production manifolds and exhaust, air cleaner, etc.

    But they are both still measured at the flywheel. :slap:

    That's part of the power drop. The 302 went from 210 to 140 HP with that step and I think no other changes.

    Then emmissions and fuel economy (less compression, more restrictive exhaust, etc) dropped it from 140 to 115 by 1975.

    Pretty sad isn't it! When you realize the new Mustang Mach 1 makes 320 NET horsepower with 281 cubic inches and pollutes less!
     
    Charlie, Aug 13, 2004
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  5. benben

    benben Member

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    So, if I change the exhaust (headers, H pipe), K&N air filter, does this give me some hp or this is give me only better sound? Or this is too stupid and wastening time/mony?

    How mutch this don graham mentioned give hp?
     
    benben, Aug 13, 2004
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  6. Charlie

    Charlie maverick.to/grabber

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    I'm not 100% on this, but I beleive that the retarded the camshaft in those years and that hurt power a lot.

    I would look at the basic groups, intake & carb, camshaft and timing chain, headers and exhaust. Nothing very aggressive as your compression and heads are probably not set up for a big cam or carb. But those mods should help you out a ton.
     
    Charlie, Aug 13, 2004
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  7. benben

    benben Member

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    Can I use this staf, my brother find out, the price was good:

    <TABLE style="WIDTH: 368pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=489 border=0 x:str><COLGROUP><COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2560" width=70><COL style="WIDTH: 14pt; mso-width-source: userset; mso-width-alt: 658" width=18><COL style="WIDTH: 301pt; mso-width-source: userset; mso-width-alt: 14665" width=401><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; WIDTH: 53pt; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=70 height=17 x:str="EDE 2121 ">EDE 2121 </TD><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; WIDTH: 14pt; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent" align=right width=18 x:num>1</TD><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; WIDTH: 301pt; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent" width=401>EDE 2121 Item: Performer Series; Intake Manifold; Non-EGR; Idle to 5500rpm; w/OEM 4 bbl Carb; Cast Finish;</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17></TD><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent"></TD><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent"></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>EDL1483</TD><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent" align=right x:num>2</TD><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; WIDTH: 301pt; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=401 height=17><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t201 path="m0,0l0,21600,21600,21600,21600,0xe" o:spt="201" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><V:p</V:p</v:shapetype><INPUT class=shape type=hidden value="Ford Kickdown Adaptor" name=pd2 v:shapes="_x0000_s1025">


    </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>E-1400</TD><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent" align=right x:num>3</TD><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent">Edelbrock 600 CFM Carb</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>EDE 8524</TD><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent" align=right x:num>4</TD><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent">Performer Series; Intake Manifold Bolt Kit;</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17></TD><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent"></TD><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent">Fits: 1993 FORD E-250 ECONOLINE V8 5.00 FI</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>EDL-1207</TD><TD style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent"></TD><TD class=xl24 style="BORDER-RIGHT: #c0c0c0; BORDER-TOP: #c0c0c0; BORDER-LEFT: #c0c0c0; BORDER-BOTTOM: #c0c0c0; BACKGROUND-COLOR: transparent">Edelbrock Air Cleaner</TD></TR></TBODY></TABLE>
     
    Last edited: Aug 13, 2004
    benben, Aug 13, 2004
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  8. T.L.

    T.L. Banned

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    The '71 had a higher compression ratio (which is good for about 15-20 more horses and better throttle response), and no power-robbing smog pump or catalytic converter like the '75 had. . That's basically the only difference...
     
    T.L., Aug 13, 2004
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  9. bmcdaniel

    bmcdaniel Senile Member Supporting Member

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    Starting in '72 Ford also retarded cam timing for emissions reasons. I've been told they accomplished that by slightly changing the position of the pin in the front of the cam that is located by the sprocket.
     
    Last edited: Aug 13, 2004
    bmcdaniel, Aug 13, 2004
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  10. littleredtoy

    littleredtoy Seth

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    power drop...

    ...there was a compression drop after '72.
    That was part of it.
     
    Last edited: Aug 13, 2004
    littleredtoy, Aug 13, 2004
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  11. T.L.

    T.L. Banned

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    I don't know about that on Mavericks, but in any case, it would only move the powerband upward in the RPM range, not really make it less powerful...
     
    T.L., Aug 14, 2004
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  12. bmcdaniel

    bmcdaniel Senile Member Supporting Member

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    Correct, it lowered cylinder pressure and therefore low rpm torque, so the "seat of the pants" acceleration was noticeably less.
     
    bmcdaniel, Aug 14, 2004
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  13. benben

    benben Member

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    Thanks to all!
     
    benben, Aug 16, 2004
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  14. Grabber75

    Grabber75 Member

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    You guys actually forgot one more thing they did to the heads........starting around '75 they also put emission "bumps" in the intake passages in the heads. look in there you will see what i mean, you can either grind them out like we used to or just get another set of heads. That hump causes alot of turbulence in the passage which greatly restricts your airflow, i.e. robs horsepower in return. the idea behind them was to mix the fuel as much as possible to burn as much fuel as possible which is supposed to lower emissions coming out.
     
    Grabber75, Aug 16, 2004
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