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DamirGTI

XU10 2.0T inlet valves in 1.9 8v head

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DamirGTI

Building another 1.9 8v engine for my daily 205 , and thinking about fitting XU10 2.0T inlet valves as i have two sets collecting dust !

 

Anyone tried and if so is it worth going larger than stock inlet valves ? (head will be ported , multi angle seats etc.)

 

D

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welshpug

Are they not shorter than standard xu9ja valves?   More like low comp xu9 where the chamber is taller?

 

I cannot say for definite, but I doubt they will make much difference on their own in the 83mm bore as you are putting the valves closer to the side of the chamber, in effect actually shrouding them more not less.

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petert
Posted (edited)

I’ve just fitted a set into that rare Grp A head I’ve been building. No big deal, other than you need to use XU10 collets & retainers. Obviously need to check seat pressure etc.

 

They’d definitely flow more on an 86mm bore but I’m sure Mattsav has posted flow figures in the past for this mod.

Edited by petert

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DamirGTI
On 7/10/2024 at 1:50 PM, welshpug said:

Are they not shorter than standard xu9ja valves?   More like low comp xu9 where the chamber is taller?

 

No , they're the same length wise as 1.9 valves ! as Peter said only twin groove on the stem for the collets .

 

D

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DamirGTI
23 hours ago, petert said:

I’ve just fitted a set into that rare Grp A head I’ve been building. No big deal, other than you need to use XU10 collets & retainers. Obviously need to check seat pressure etc.

 

They’d definitely flow more on an 86mm bore but I’m sure Mattsav has posted flow figures in the past for this mod.

 

Hmm , so what do you recon Peter ? worthwhile venture/endeavor or better keeping stock size 1.9 valves ? 

 

I can see shrouding potentially problematic and not much "meat" to work with for unshrouding , very little on the edge of the chambers to open up but liner dia. does seem problematic .

 

I remember , late mr. Guy Croft also experimented with variety of valve sizes and found flow bench tested stock size to be best but "penny on a stick" shaped , i believe PTS sport/race valves or something like so .

 

D

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petert
Posted (edited)

I’ll take some pics next week for you. Sorry, can’t do until late next week. I found the flow charts. I suspect Matt sent them directly to me. Theydidn’t have XU10 valves in XU9 head. They were comparisons of stock & ported heads. 
 

Really important are the XU10J2 retainers. Collet position is very different.

Edited by petert

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petert

I found some pics:

1. Seats cut in Grp A head for XU10 valves

2. Differences in collet positions between Catcam, XU9 and XU10 retainers. You can see the difference in collet position.

 

head chamber-seats.jpg

XU9 XU10 Retainers 2.jpg

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DamirGTI

See i really haven't spotted that difference in collets depth , thanks for a heads up !

 

Fancy sharing some pictures of that Grp A head , aka port shapes ? really curious what's been done to that head with regards to the ports .

 

Thanks ! B)

D

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