Tuesday, June 14, 2011

Clean up time!

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With the intake and exhaust guides removed I took the opportunity to clean up the ports a little bit more.

Started with the exhaust............still a little bit dirty, not for long!
The F22A6 head really doesn't have much to remove when it came to the valve guide humps. I had the bulk of the guide humps removed fairly quickly.
 Took them up to an 80 grit for now.......they will be mirror finish when completed.
The intake had less guide material...
However the port itself was an odd shape. The long radius had a bit of a dead zone directly behind the valve guide.The transition from the throat into the seat has a pretty good step as well.
Once I get a flow bench setup I will spend a bit more time figuring out what to do with that dead zone for now I removed a bit of material from the front of the guide only.
 Looks like I may have to add some material to fill that dead spot....only time on the bench will tell.
For now the exhaust ports will get finished and the intake ports will have to wait.

Time to start wet sanding

Sunday, June 12, 2011

Little bit of Guide Work

Cranked up the old oven to 150°C and got the workbench prepared to remove a couple valve guides tonight.

The exhaust side was a bit more work than the intake side. Now I know that if I get into doing this on a regular basis. I will have to invest in an air chisel with a 5.5mm guide bit. Too many trips back and forth to the oven for this cat.

Exhaust side removed....took a few swings of a hammer to get them out. The added surface area on the cylinder head for the exhaust guide acts as a heat sink. This is a good thing for cooling the exhaust valves. Not so good for removing the exhaust guides!
 Intake side removed, fairly easily as there is approximately half the surface area to overcome.
All ready for a bit more porting........
Next update should have all these ports ready for a valve job and new guides.

Keep the AFRs low