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Engine, Transmission, Drive Line, Etc
Engine running crummy
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<blockquote data-quote="Stanglover" data-source="post: 352940" data-attributes="member: 3596"><p>Holy crap John, sounds like my issue all over again! In my case it <em>WAS </em>a cracked cap. I have found mine seems t like the Autolite 25's better, nice mid brown color, no fowling at all. My plugs are set at .045" because of the high volt coil and Pertronix II. Engine pulls like a train now.</p><p></p><p>You didn't mention what your idle vacuum was. Your cam is a bit more aggressive than mine, but I would think your vacuum would be around 14-15" Hg. Mine is 17" Hg and I found on my 670 Holley, the 6.5 P/V worked best, didn't like an 8.5 at all, nor did it like a different pump cam other than what it came with. At least now I have a completely cleaned carb!! IF I did need to change carbs, I was thinking of going to an HR 735 as well, but I can't justify another 700 bucks Cdn to find out if it's any better.... can I borrow yours??!!!</p><p></p><p>Fuel; all your MI fuel is Ethanol laced, correct? Can you get non-ethanol and see how it runs on that?</p><p></p><p> When I was at the Dearborn show, I was talking to a guy who said he was a high school science teacher. We got talking about Ethanol in gas. He asked what I knew about it other than it's bad news. He explained to me that ethanol does<em> not </em>absorb water out of the atmosphere, but it's the microbes in Ethanol (because it's plant based) that actually "eat" components of gasoline and excrete water (pee) and that is where the water actually comes from. Blew me away, sounds plausible, but I have not actually checked out his "theory". No doubt that statement will cause some comments!! </p><p></p><p> Hope you find the answer soon, very frustrating to say the least, I ought to know!</p><p></p><p>Geoff.</p></blockquote><p></p>
[QUOTE="Stanglover, post: 352940, member: 3596"] Holy crap John, sounds like my issue all over again! In my case it [I]WAS [/I]a cracked cap. I have found mine seems t like the Autolite 25's better, nice mid brown color, no fowling at all. My plugs are set at .045" because of the high volt coil and Pertronix II. Engine pulls like a train now. You didn't mention what your idle vacuum was. Your cam is a bit more aggressive than mine, but I would think your vacuum would be around 14-15" Hg. Mine is 17" Hg and I found on my 670 Holley, the 6.5 P/V worked best, didn't like an 8.5 at all, nor did it like a different pump cam other than what it came with. At least now I have a completely cleaned carb!! IF I did need to change carbs, I was thinking of going to an HR 735 as well, but I can't justify another 700 bucks Cdn to find out if it's any better.... can I borrow yours??!!! Fuel; all your MI fuel is Ethanol laced, correct? Can you get non-ethanol and see how it runs on that? When I was at the Dearborn show, I was talking to a guy who said he was a high school science teacher. We got talking about Ethanol in gas. He asked what I knew about it other than it's bad news. He explained to me that ethanol does[I] not [/I]absorb water out of the atmosphere, but it's the microbes in Ethanol (because it's plant based) that actually "eat" components of gasoline and excrete water (pee) and that is where the water actually comes from. Blew me away, sounds plausible, but I have not actually checked out his "theory". No doubt that statement will cause some comments!! Hope you find the answer soon, very frustrating to say the least, I ought to know! Geoff. [/QUOTE]
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