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Tractor Talk Discussion Forum

Re: 4 cyl Firing order

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Author  [Modern View]

11-14-2012 19:28:33

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There are differences in harmonics in the crank that do make a difference. 1342 is more evenly spread on the crank length. The vibration at the whole engine level might be the same, but internally 1342 has the advantage. (and that is why it has the preponderance of use) a flat frank, (as these are) is somewhat less problematic than compound plane cranks, or especially offset journal cranks like on a V6 with 90 degree bores. Complex dampeners and external balance are often needed to assure crank durability. Main bearings between each rod journal (or twinned journals on a V engine) are not found on many of our old iron. that fact is even more of a factor when they are hot rodded.

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David G

11-14-2012 19:32:47

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 Re: 4 cyl Firing order in reply to Janicholson, 11-14-2012 19:28:33  
I knew you would come through Jim.

Another issue I thought of was amount of air that has to go through intake runners per revolution with 1243 is twice what will be needed for 1342.

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11-14-2012 21:32:08

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 Re: 4 cyl Firing order in reply to David G, 11-14-2012 19:32:47  
I think I get what you mean. But I think the amount is delivered in pulses either way. In 1342, the front port sucks then the rear port, then front, then rear.
In 1243, the front sucks twice in a row (sequentially) then the rear port sucks twice. It probably makes little difference, Jim

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