E-85 swap?
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E-85 swap?

  1. #1
    Retired Air Force Master Sergeant's Avatar
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    Default E-85 swap?

    Tore the engine down and the damage was not bad, the block and pistons are fine. Cannot afford to buy and prep a dart block right now (will be unemployed in April) but hate to put it all back together without an upgrade. I am considering an E-85 swap. If I mill down the deck and/or heads maybe I can get 13.5-1 comp ratio without changing the pistons. Then I would just have to convert the carbs and fuel system and I will have (according to my desk-top dyno) an additional 90hp at 6500 RPM. The heads or cam profile are not optimal but still a pretty good boost! It would run cooler so maybe I could ditch the water in the headers? The only down side I see is fuel consumption. Long trips like DLB hookey day would be less practical but not impossible. Maybe I could get someone to carry gas for me? I could get bigger tanks? I found 13 gallon tanks vs. my 10 gallon ones online. Faster and more unpractical! Why is that always the case? My desk-top dyno also shows the hp between the 489 and 565 to be identical at 6500 RPM for my set up? The 565 has a lot more power at 5000 but not at 6500. I wonder how accurate that is?

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  3. #2
    gn7
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    Watch it when you start milling things. Next thing you know, your fly cutting pistons and giving some back. the reason the 565 shows less with the same setup is that as the Rs go up, the heads and cam fall short.



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    Quote Originally Posted by gn7 View Post
    Watch it when you start milling things. Next thing you know, your fly cutting pistons and giving some back. the reason the 565 shows less with the same setup is that as the Rs go up, the heads and cam fall short.
    I think my solid roller cam is OK but my heads are Pro-1 325s w/ no CNC job.

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    Quote Originally Posted by Master Sergeant View Post
    I think my solid roller cam is OK but my heads are Pro-1 325s w/ no CNC job.
    When I said my camshaft and heads were not optimal I was not refering to engine size although that may be the case for my heads rather not optimal for E-85 as per the excerpt from an artical I found on-line:
    "When you're building an engine with the intention of running on corn, your higher compression ratio limit gives E85 other advantages, but you have to take advantage of these in order to gain the full benefit of the conversion. High-compression engines by nature produce a lot of low-rpm power. This gives room for about 15 degrees longer seat-to-seat camshaft duration without hurting the low-rpm power, while increasing the high side. Lower-compression engines, 10.5:1 for example, produce most of their power at the end of the power stroke, while high-compression engines get their power from the beginning. It lets us open the exhaust valve sooner, in turn allowing us to have a smaller exhaust valve. The smaller exhaust valve can then make room for a larger intake valve. The heavy air/fuel ratio of the alcohol mix can really benefit from this change. Of course, if you've already purchased your heads and aren't looking to spend a ton of money re-machining them, you can still get some of the benefit with a camshaft swap"

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    MAD FABRICATOR wirsboguy's Avatar
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    Default e-85 info

    Where did you find that info ? I would like to read more.

    Thanks, Dave
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    Quote Originally Posted by wirsboguy View Post
    Where did you find that info ? I would like to read more.

    Thanks, Dave
    http://www.popularhotrodding.com/tec...e85/index.html

  9. #7
    gn7
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    You can look at a alky motor as behaving SOMEWHAT like a NOS, or even a blower motor in that the fuel packs oxygen and therefore requires more fuel, much like a NOS motor. But to say you can get away with a smaller exhaust is not how I see it. More like opening it sooner to dump the extra exhaust gases. Years ago Mondello took this same approach with Chevy fuel heads and created what he called the 2 X 2 BBC head. A 2" exhaust and intake, for nitro use. It was a complete failure. Not saying there isn't a need to address alky different ly than gas. saying let you cam grinder handle it, and don't rethink the head. Also, it is true that higher compression does increase low and mid range power, but never forget how much alky is in the cylinder and how long alky burns in the cylinder. Nitro is even worse. Open the exhaust too early on an alky deal and all you end up with is big bitch flames in the exhaust. Nitro is even worse.

    Also, lower compression motor loose cylinder pressure sooner, crank angle wise, sooner than high compression motors. so in that respect they would be a better candidate for a sooner exhaust opening. Blower motors are low compression motors with high cylinder pressure. They loose cylinder pressure after firing at a alarming rate compared to were it started. Which is why it is a waste to spin the piss out of a blower motor and use the lower end torque.
    don't get to hung up on heads for an E85 deal. Let the cam grinder deal with it.



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    We had a discussion going on E85forum.com last year and one of the experts on there went through a lot of formulas and came up with ethanol giving off approximately 30% more exhaust volume over gasoline.

    That's why it spools up turbos so well.....

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    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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