Xu10 Valves Into Xu9?

[edbar 6]

Will the inlet valves from an xu10 8v fit in a xu9 8v as a big valve option?They are 1.1mm bigger than an xu9's and same stem thickness, think .03mm taller? Anyone any experiance of this?

Thanks for any info.

Edd

[Baz 421]

Why not just use the Xu10 head?

[welshpug 1,662]

do you really need bigger valves?

[edbar 6]

Cos I have a spare xu9 head and I can get valves very cheap through work, oh and I like to mess around with heads. I would like more power from the engine before I go 16v so bigger valves are next on the to do list.

[welshpug 1,662]

that didn't answer the question though, do you NEED bigger valves?

[edbar 6]

Well you didnt answer my question.

Only the dyno will tell if its an improvement over standard sizes. How would you tell if it needs them then?

[richsmells 2]

Can/worms http://forum.205gtidrivers.com/index.php?showtopic=31290

[pug_ham 244 3 Cars]

AFAIK they won't fit straight in because they have a thicker stem don't they so you'd need to get suitable valve guides fitted into the head for an absolute minimal gain they'd offer.

 

Graham.

[edbar 6]

Both 8mm stems.

[Michael 0]

You'll need larger valve seat inserts to fit bigger valves, because original ones are only big enough for standard valves.

 

Best regards

 

Michael

[edbar 6]

Trial fitted a valve the other night and found that out but thanks. Think I'm going to go for 43mm inlets if I'm going to get new inserts.

Thanks,

Edd