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insight into V4 design and operation

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dbvandy:
Hello all!

Now that I have the Webster complete (http://madmodder.net/index.php?topic=4413.0)  and the Otto running (http://madmodder.net/index.php?topic=4425.0), I am looking toward the next project:  designing a V4 OHC from the ground up.

I want it to be:
completely open design with ball bearings on the crank and cams
belt driven and out of bar stock
compact as possible
square 1 inch bore 1 inch stroke
fork and blade connecting rod
90 degree V
CDI ignition
single carb (or vapor tank)

I have a vision of what I want and will start drawing it up in solidworks soon, but what I don't know is this...  timing of the pistons and firing order.  Cams will take care of themselves when the engine is setup.  I plan to model it off the Otto engine cylinder.

Any insight or plans to give me some ideas would be appreciated...

Thanks guys!

Doug

jim:
good luck, another thread i'll be following closely

andyf:
I've never owned a V4 car, but in the dim and distant past the firing order on my flat four Jowett Javelin was the same as a straight four: 1-3-4-2. My wife's 1970s VW Beetle was the same. There doesn't seem to be any reason why a V4 should differ.

I'm looking forward to watching your progress; on your current form it should be running before the end of the month.

Andy.

DavidA:
Doug,

...completely open design with ball bearings on the crank and cams...

That will make for very a interesting crankshaft.

I remember the days when replacing the roller bearing big end on a single cylinder bike engine meant much fiddling with pressed taper fits on the crank - pin and the webs.

Dave.

cuog:

--- Quote from: andyf on March 07, 2011, 03:18:17 AM ---I've never owned a V4 car, but in the dim and distant past the firing order on my flat four Jowett Javelin was the same as a straight four: 1-3-4-2. My wife's 1970s VW Beetle was the same. There doesn't seem to be any reason why a V4 should differ.

I'm looking forward to watching your progress; on your current form it should be running before the end of the month.

Andy.

--- End quote ---

ACVW firing order is 1-4-3-2(both cylinders on each head fire one after the other then it goes to the other head)

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