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Thread: The Technical Questions Thread

  1. #31
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    thanks, it does explain the three exhaust, but but the exhaust valves in this sequence, makes it even more strange to use three carbs. The way you showed it would suggest a two carb setup....
    "I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams

  2. #32
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    Quote Originally Posted by henk4 View Post
    thanks, it does explain the three exhaust, but but the exhaust valves in this sequence, makes it even more strange to use three carbs. The way you showed it would suggest a two carb setup....
    This would allow a 3 carb setup but while the outer 2 carbs will serve 2 cylinders the centre one will serve 4 - thats bad, unless its double barrel or something. Whatever, the 3 carbs wouldnt be identical.

    More likely: The 3 carbs feed a single manifold as i predicted. This manifold uses 3 double barrel carbs as you have probably seen before, furthermore the manifold outlets can fit my attatched picture. 3 pics below illustrate this:
    http://www.performancecoatings.com/FlatIntake.jpg
    http://www.offyparts.com/images/offy_1072.JPG
    http://www.riley-auto.com/images/intakes_0051.jpg
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    • File Type: jpg 1.JPG (18.0 KB, 9 views)
    Last edited by jediali; 06-15-2007 at 06:40 AM.
    autozine.org

  3. #33
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    just check the position of the three carbs on the picture I posted. They are not evenly spread over the engine but to one side. It really looks like there would a place for a fourth.

    The way you now designed the inlet side would mean 3 carbs, evenly spread over the engine centre.
    "I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams

  4. #34
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    Isn't that a bit like the Six-Pack Mopar V8s, only halved?
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  5. #35
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    Quote Originally Posted by henk4 View Post
    just check the position of the three carbs on the picture I posted. They are not evenly spread over the engine but to one side. It really looks like there would a place for a fourth.

    The way you now designed the inlet side would mean 3 carbs, evenly spread over the engine centre.
    it does not need to be as strict as that, individual manifold designs vary. What would be of technical importance is the gemoetry of the ducts leading to the inlets from the manifold. If the carbureters deliver equal fuel/air mixture to each cylinder then its doing its job properly. longitudonal shifting of the carbureters is not critical in my opinion.
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  6. #36
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    Quote Originally Posted by jediali View Post
    it does not need to be as strict as that, individual manifold designs vary. What would be of technical importance is the gemoetry of the ducts leading to the inlets from the manifold. If the carbureters deliver equal fuel/air mixture to each cylinder then its doing its job properly. longitudonal shifting of the carbureters is not critical in my opinion.
    but it looks rather suboptimal to me...
    "I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams

  7. #37
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    Quote Originally Posted by henk4 View Post
    but it looks rather suboptimal to me...
    flathead and pushrod is sub-optimal ! I think there is too much I don't know about the engine to say its the best or not. But i know if i was asked to set them to the side I could still make em work.
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  8. #38
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    Quote Originally Posted by jediali View Post
    flathead and pushrod is sub-optimal ! I think there is too much I don't know about the engine to say its the best or not. But i know if i was asked to set them to the side I could still make em work.
    anyway, thanks for the explanation, maybe we will get a US specialist on board to tell us about all the intricacies of sidevalves and carb set-ups...
    "I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams

  9. #39
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    Thanks for the explanation for the ITBs guys.

    Besides the power increase, they sound very nice too right?

  10. #40
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    Hijack time.

    Now this is a good one. I got this photo of a Cadillac Sixteen's engine bay off of Wikipedia. By chance, I looked at the image creators' name to find it was the one and only Karrmann. He has his own user page on Wikipedia.

    Anyways, I thought that was a strange cowinkey-dink. I assume that the Cadillac Sixteen's 13.6L engine is based off of two 6.8L V8s. I had a look at the picture and as I was looking at the exhaust, I noticed a repeat of a little pokey thingy that seemed to indicate a spacing of the two V8s. What are the little pokey things and is this an indication of twoV8s mashed toghether? If it is two V8s mashed together, what were the original engines used in normally?
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  11. #41
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    Quote Originally Posted by Kitdy View Post
    What are the little pokey things
    Those things are the studs & bolts which attach the exhaust manifold flange to the cyl head
    and is this an indication of twoV8s mashed toghether?
    Not really - it's just where the (nicely thick) flange happens to be divided as it extends along the head

  12. #42
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    The V16 is 32 valve, I am guessing its two regula pushrod V8s put together. Dont always go buy capacity when establishing engine DNA. If an engine is related its bore/stroke may change a wee bit.
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  13. #43
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    Quote Originally Posted by henk4 View Post
    anyway, thanks for the explanation, maybe we will get a US specialist on board to tell us about all the intricacies of sidevalves and carb set-ups...
    fresh material.

    A Miller-Ford 1935, shot at the Festival of Speed. With a flathead V8 and carb set-up that makes absolute sense...
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    "I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams

  14. #44
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    I don't think that it is two V8s put together.

    -The block shows no joint in the middle
    -The head shows no joint either
    -The bolt pattern on the cylinder head would tend to imply that the cylinders are equally spaced (as opposed to having extra space where the supposed 2 V8s meet).

    Also the manifold is probably divided like that (every two ports) to make sure that the flange sits flat against the block. If it was one piece the joint would suffer because of thermal expansion.

    I thought that this engine had SOHC as opposed to pushrods?
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  15. #45
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    not "literally" two V8s bolted together. In the same way the AM V12 is two duratec V6s's bolted together, the point is you
    -cass the extended block and cylinder heads
    -redesign the crankshaft for balance and power delivery
    -alter the camshaft timing programme
    ...plus loads of other less major design issues.

    A funny comparison could be the V16T which uses two transverse Ferrari v8s with a longitudonal central output shaft
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