SuzukiSavage.com - Big Bore Engine - Part 2

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Big Bore Engine - Part 2 - Head (Read 208 times)

DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 3714 Honolulu	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 it’s 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 .060” clearance between the spring retainer and the underside of the rocker arm. This .050” 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.

_050_Copper_Wire_Spring_Retainer_Clearance_2.jpg

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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

I’m 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. Let’s 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 .420” lift. It’s ready to install on the big bore engine. I’m chompin at the bit to give it a try.

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

Knowledge is power.

Mike

Knowledge is power.

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RocketScienceSmurf Senior Member Offline SuzukiSavage.com Rocks! Posts: 268 Sweden Gender:	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
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Armen Serious Thumper Online Half-Witted Wrench-Jockey from Jersey Posts: 1422	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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