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106 Xsi Cylinder Head


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3 replies to this topic

#1
bren_1.3

bren_1.3
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Joined: 19 Apr 2004
  • Location:Blackpool @ home. Manchester @ uni
is it possible to reshape the protusion of the valve guide that reaches into the port? it looks thick enough to have some reprofiling done. i know shenpar remove all of the valve guide that protudes into the port. it was mentioned on here a while ago.

does anyone have any thoughts on its ports? any pointers? they look big enough for the valve size to me.

#2
axnutty

axnutty
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Joined: 03 May 2005
  • Location:Harrogate - North Yorkshire
Yes you can profile the valve guide so its smooth with the throat.

The inlet side is already very good. I generally just remove the castings marks and any slight differences on the ports. As for the exhaust side I find theres quite a lot of work that can be done as they are fairly small in comparison.

Theres also a small hump that can be removed I think. Its been sometime since I looked at the injection heads - but there definetly is in the carb'd GT heads.

The valve sizes are pretty good to start with. Much much bigger than the carb'd heads again. I have had bigger valves fitted in the past but it depends how far you want to go obviously.

#3
christopher

christopher
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Joined: 24 Mar 2004
  • Location:Copenhagen, Denmark
Garage View Garage

Yes you can profile the valve guide so its smooth with the throat.

The inlet side is already very good. I generally just remove the castings marks and any slight differences on the ports. As for the exhaust side I find theres quite a lot of work that can be done as they are fairly small in comparison.

Theres also a small hump that can be removed I think. Its been sometime since I looked at the injection heads - but there definetly is in the carb'd GT heads.

The valve sizes are pretty good to start with. Much much bigger than the carb'd heads again. I have had bigger valves fitted in the past but it depends how far you want to go obviously.



Bren there is a tiny bit of flow to be had with removing the guide in the port. I however am going with a reshaped guide. You might it very difficult to re-cut the seat at a later date if you remove this.

#4
bren_1.3

bren_1.3
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Joined: 19 Apr 2004
  • Location:Blackpool @ home. Manchester @ uni
reshaped guide it is!

Yes you can profile the valve guide so its smooth with the throat.

The inlet side is already very good. I generally just remove the castings marks and any slight differences on the ports. As for the exhaust side I find theres quite a lot of work that can be done as they are fairly small in comparison.

Theres also a small hump that can be removed I think. Its been sometime since I looked at the injection heads - but there definetly is in the carb'd GT heads.

The valve sizes are pretty good to start with. Much much bigger than the carb'd heads again. I have had bigger valves fitted in the past but it depends how far you want to go obviously.


how much bigger is bigger? i believe theyre bigger than the TU24 valves as standard. and how much would a set cost? who does them? yourself?

i thought about making the short side bend a bit smoother, its dips quite viciously.

Bren there is a tiny bit of flow to be had with removing the guide in the port. I however am going with a reshaped guide. You might it very difficult to re-cut the seat at a later date if you remove this.


duly noted. if only flow benches werent so much money :D