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

Paul

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.

Kenny  Onalaska, Texas

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

Paul

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.


Lawrenceville, GA

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.

 
 Steve Metzger       Tucson, Arizona

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

Paul

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.

Kenny  Onalaska, Texas

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

Doing Fords for 45 years. '56 Customline Victoria

E.J. in Havana FL

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

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

And modify it to do the Y block firing order.


Lawrenceville, GA