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Big Bore Engine - Part 2 - Head (Read 182 times)
DragBikeMike
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Re: Big Bore Engine - Part 2 - Head
Reply #45 - 07/19/20 at 23:47:41
 
I measured the combustion chamber volume after reassembling the head.  It is now 55cc.  Those new intake valves take up a little extra room.  I will need this value to confirm my static compression ratio.
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DragBikeMike
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Re: Big Bore Engine - Part 2 - Head
Reply #46 - 07/19/20 at 23:48:29
 
Remember that spring retainer clearance issue?  I was worried about the retainer hitting the underside of the rocker arm.  Now itís time to check that.  Install the camshaft along with the head cover and rocker arms.  The cam must be in the TDC compression position.  Use a few head cover bolts to make sure the head cover is up hard against the head.  You need about .060Ē clearance between the spring retainer and the underside of the rocker arm.  This .050Ē copper wire passes through with plenty of room to spare.  Good to go.  If the wire had not passed through, I would have ground the underside of the rocker arm just enough to allow the wire to pass through.  Check this at all four spring retainers.
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DragBikeMike
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Re: Big Bore Engine - Part 2 - Head
Reply #47 - 07/19/20 at 23:49:32
 
Iím not an advocate for polishing.  I prefer to test it with the flow bench and look for significant, measurable improvements in flow.  The finished ports are relatively free of imperfections.  There are no big chunks of stuff sticking out into the air stream.  Good enough.  Letís face it, after a few miles of operation the crud is gonna start accumulating and that pretty mirror finish will be buried.
 
The completed cylinder head flows much better than the Stage II.  It can handle a cam with up to .420Ē lift.  Itís ready to install on the big bore engine.  Iím chompin at the bit to give it a try.

I hope you find this report informative and I welcome your questions and comments.

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Mike
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RocketScienceSmurf
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Re: Big Bore Engine - Part 2 - Head
Reply #48 - 07/20/20 at 03:53:54
 
Your level of skill and knowledge is nothing short of amazing! I am very grateful that you share both the information and the pictures with us Smiley
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Armen
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Re: Big Bore Engine - Part 2 - Head
Reply #49 - 07/20/20 at 06:18:49
 
Amazing!
Thanks for sharing your hard work.
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