Cylinder Head Fire Ring Peening - Revision history

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-19T17:47:50Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 17:47, 19 October 2009
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	Image:Peen_4.jpg		Image:Peen_4.jpg

	Image:Porosity.jpg\|Here is a photograph of the surface of a head that has been peened and skimmed which shows very clearly the type of porosity that can occur on the head surface.		Image:Porosity.jpg\|Here is a photograph of the surface of a head that has been peened and skimmed which shows very clearly the type of porosity that can occur on the head surface. It illustrates quite clearly (by dint of some crudely drawn lines) the fire ring area that has been peened and is as a result completely free of any such porosity and voids even though the adjacent areas both inside and outside of the fire ring are badly peppered.

	It illustrates quite clearly (by dint of some crudely drawn lines) the fire ring area that has been peened and is as a result completely free of any such porosity and voids even though the adjacent areas both inside and outside of the fire ring are badly peppered.

	</gallery>		</gallery>

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-19T17:42:08Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 17:42, 19 October 2009
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	Image:Peen_4.jpg		Image:Peen_4.jpg

			Image:Porosity.jpg\|Here is a photograph of the surface of a head that has been peened and skimmed which shows very clearly the type of porosity that can occur on the head surface.

			It illustrates quite clearly (by dint of some crudely drawn lines) the fire ring area that has been peened and is as a result completely free of any such porosity and voids even though the adjacent areas both inside and outside of the fire ring are badly peppered.

	</gallery>		</gallery>

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T12:48:14Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 12:48, 17 October 2009
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	I have published below some photos, firstly the tool I use to peen the surface and also some pictures of a cylinder head ~~surfce~~ that has been peened.		I have published below some photos, firstly the tool I use to peen the surface and also some pictures of a cylinder head surface that has been peened.

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T12:46:35Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 12:46, 17 October 2009
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	I have published below some photos, firstly the tool I use to peen the surface and also some pictures of a cylinder head surfce that has been peened.		I have published below some photos, firstly the tool I use to peen the surface and also some pictures of a cylinder head surfce that has been peened.


	~~The tool is an old exhaust valve with the head reduced and domed and the tip reduced to 4mm with the end a large radius dome shape. An old guide is tapped on to it to assist with holding the tool.~~

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T12:45:57Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 12:45, 17 October 2009
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	<gallery>		<gallery>
	Image:Peen_Tool.jpg		Image:Peen_Tool.jpg\|The tool is an old exhaust valve with the head reduced and domed and the tip reduced to 4mm with the end a large radius dome shape. An old guide is tapped on to it to assist with holding the tool.

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T12:31:15Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 12:31, 17 October 2009
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	===Peening of fire ring to eradicate porosity===		==Peening of fire ring to eradicate porosity==


			By Dave Andrews


			I have been asked a number of times to explain the process I use to eradicate porosity on the K series head surface.

	~~By Dave Andrews~~

	~~I have been asked a number~~ of ~~times~~ to ~~explain~~ the process ~~I use to eradicate~~ porosity on the ~~K series head~~ surface.		The area of the fire ring and immediate surroundings are peened downwards to compress any voids or porosity before the head is skimmed, this is akin to a cold forging process. When the head is skimmed the material where the fire ring sits is then consolidated and free of any voids or porosity, the area beneath the surface is also homogenised and should be blemish free.

	The area of the fire ring and immediate surroundings are peened downwards to compress any voids or porosity before the head is skimmed, this is akin to a cold forging process. When the head is skimmed the material where the fire ring sits is then consolidated and free of any voids or porosity, the area beneath the surface is also homogenised and should be blemish free.

	This reduces the possibility of a fire ring breach due to porosity to virtually zero.		This reduces the possibility of a fire ring breach due to porosity to virtually zero.


	I have published below some photos, firstly the tool I use to peen the surface and also some pictures of a cylinder head surfce that has been peened.		I have published below some photos, firstly the tool I use to peen the surface and also some pictures of a cylinder head surfce that has been peened.


	The tool is an old exhaust valve with the head reduced and domed and the tip reduced to 4mm with the end a large radius dome shape. An old guide is tapped on to it to assist with holding the tool.		The tool is an old exhaust valve with the head reduced and domed and the tip reduced to 4mm with the end a large radius dome shape. An old guide is tapped on to it to assist with holding the tool.



	<gallery>		<gallery>

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T12:27:46Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 12:27, 17 October 2009
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	The tool is an old exhaust valve with the head reduced and domed and the tip reduced to 4mm with the end a large radius dome shape. An old guide is tapped on to it to assist with holding the tool.		The tool is an old exhaust valve with the head reduced and domed and the tip reduced to 4mm with the end a large radius dome shape. An old guide is tapped on to it to assist with holding the tool.

			<gallery>
			Image:Peen_Tool.jpg

	~~[[Image:Peen_Tool.jpg]]~~

			Image:Peen_1.jpg

	~~[[Image:Peen_1.jpg]]~~

			Image:Peen_2.jpg

	~~[[Image:Peen_2.jpg]]~~

			Image:Peen_3.jpg

	~~[[Image:Peen_3.jpg]]~~

			Image:Peen_4.jpg
	[[Image:Peen_4.jpg]]		</gallery>

	== Forum thread ==		== Forum thread ==

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T11:58:12Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 11:58, 17 October 2009
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	[[Peen_4.jpg]]		[[Image:Peen_4.jpg]]

	== Forum thread ==		== Forum thread ==

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T11:57:30Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 11:57, 17 October 2009
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	[[Image:Peen_3.jpg]]		[[Image:Peen_3.jpg]]


			[[Peen_4.jpg]]

	== Forum thread ==		== Forum thread ==

Andrew S: /* Peening of fire ring to eradicate porosity */

2009-10-17T11:55:01Z

Peening of fire ring to eradicate porosity

← Older revision		Revision as of 11:55, 17 October 2009
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	[[Image:Peen_2.jpg]]		[[Image:Peen_2.jpg]]


			[[Image:Peen_3.jpg]]

	== Forum thread ==		== Forum thread ==