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By PF Arcand - 16 Years Ago
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How many firing orders will work on a Y-Blk?. Discovered some time ago that my engine is wired, #1 at the left front.(from the drivers seat) Firing order is supposed to be 1-5-4-8-6-3-7-2 counter clockwise at the Distributor, starting from the right, correct? Cylinders numbered from the right, 1-2-3-4 & left 5-6-7-8. So, I assumed must be wired per sbc which is from the left front, and 1-8-4-3-6-5-7-2, clockwise? Their cylinder #s are from the left, 1-3-5-7 & right 2-4-6-8. Decided to sort it out, first two cylinders are 1-8 (counterclockwise) or 1 to 2 (right front)clockwise? The engine runs o.k., & I'm aware that there are about 4 different orders used on 90 degree V-8s, but what do I have here? Or am I missing the obvious? Sorry if this is as clear as mud, but I'm confused.. Thanks
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By 62galxe - 16 Years Ago
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TUNE UP SPECIFICATIONS passenger side FIRING ORDER 1-5-4-8-6-3-7-2 1 2 3 4 distributor front 5 6 7 8 Distributor rotation Counter clock wise viewed from above.
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By PF Arcand - 16 Years Ago
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Sorry to bother everybody, this problem had me going for a while! The firing order is correct. The problem is that the plug wiring was "not" started on #1 on the Distributor cap. It was started one to the left! Why?! I have no idea? Thanks
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By charliemccraney - 16 Years Ago
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The distributor may be installed a tooth off so they "fixed" it by moving all of the wires 1 terminal to the left. Technically, the firing order will be correct which is why it runs well.
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By GREENBIRD56 - 16 Years Ago
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Paul - your engine is mechanically timed by the way the cam and valve timing events interact with the position of the crankshaft. Unless the mechanical parts are physically changed to a different arrangement - no other "firing order" is possible. Numbering schemes are a different matter - all sorts of numbering schemes can be created (where is number one this week?) - but the order in which the cylinders reach TDC on the compression stroke is mechanically bound. There are differing cam timing schemes that can be tried - but it takes a new cam. The Y-block uses the same firing order / mechanical scheme used on the flathead. It was designed to reduce torsional effects on the crankshaft (flatheads had fewer main bearings) so the combined bending and torsional stress are (to a degree) minimized. Racing scrubs have been altered by building special cams - to use the flathead firing scheme.
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By PF Arcand - 16 Years Ago
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Chuck & Steve: Good explanations, I should have thought about the distributor being one tooth off. And I thought about the cam, but got exasperated for a while.. Thanks
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By 62galxe - 16 Years Ago
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my buddy did same thing on his chevy. wired it by picture in manual. brought #1 up on compression stroke and found rotor pointing at a different terminal. started #1 from where the rotor pointed and all was well.
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By ejstith - 16 Years Ago
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Check out this post on the HAMB. Is the coolest damn thing I ever saw. Its about the 8th post down from the top. Animated firing order.
http://www.jalopyjournal.com/forum/showthread.php?t=334133&page=2
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By MoonShadow - 16 Years Ago
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Wow! You can almost hear the engine idle with that graphic. Neat! We should see if we can "borrow" it and post it in the Tech section! Chuck in NH 
 
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By charliemccraney - 16 Years Ago
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And modify it to do the Y block firing order.
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By ejstith - 16 Years Ago
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That was an FE block I think ...
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