Anybody know what the height of the valves from the valve tip to the spring seat should be when new? I had this written down, and cannot find it now.....

 

I dont quite understand what you are asking. If you want the overall lengths of valves, they are as follows, inlet/ 105.68mm and exhaust /105.5mm. Spring lengths are given as 23.45mm ,valve open and 32mm valve closed. Free spring length is given as 39.8 mm. Head diameter of ex . valve is 31.0-31.2mm and inl. valve is 35.0-35.2mm. Stem diameters are , 6.970mm/6.955mm for inlet and 7.960/7/938mm for exhaust. Hope this is of some help. This info is given in The Story of The Ford Sierra RS Cosworth. It can be obtained from www.cppress.co.uk I dont know the price but it is full of engine data. I live just up the road from you so you could contact me on 02392 259358 if you need further info. My name is John. My 3 Door is with Tremona garage at the moment for a total engine rebuild. New bits so far £3800!!

 

Hi John, thanks for the info, but not quite what I need. If you put one each of the inlet and exhaust valve into the head, I need the distance from the valve tip(where the follower would sit) to the casting underneath where the spring platform would sit. This is so that I can calculate how deep to cut new valve seats.

 

Sorry mate. That info is not in the book.

 

Hi,

Is that you need ?

Regards.
Claude

 

Perfect! Thanks Claude. Is it the same on both inlet and exhaust?

 

I suppose, cause lengh valves and springs are identical.

Regards.
Claude

 

Thanks again Claude, very helpful.