X16XEL Inlet Ports

[MC]

Thought I'd show everyone what an X16XEL inlet port looks like as there are often questions about the differences between C16XE, X16XE and X16XEL.

Can anyone post the other two for comparisson?

http://i245.photobucket.com/albums/gg54/MC1978gti/27032008503.jpg
http://i245.photobucket.com/albums/gg54/MC1978gti/27032008501.jpg

MC

[Stuart]

reckon they were drunk when they designed the opening of the port? lol

[maccas]

i can get a pic of the x16xe inlet ports as i'll be doing some more work on my motorbike carb manifold tomorrow, they are different to those though definately, they are elliptical with a cut out for the top for the injector, then they have like a a barrier to separate the mixture between the two valves, that looks like quite a good design on that pic, unless someone disagrees?

maccas

[Adam]

reckon they were drunk when they designed the opening of the port? lol
Apprently there a good port, better than the c/x16xe, which look like this:
http://img.photobucket.com/albums/v86/Nova-crew/X16xeinletports.jpg

[Stuart]

ohh by comparison yeah the xel port does look better, but it still looks a bit mental lol.

Mark, make charles fit a Duratec head to your bottom end :D

[Bouch]

The picture you posted is strange because i had a X16 XEL and the ports looked exactly like these. Like a stumpy dick...
http://img.photobucket.com/albums/v86/Nova-crew/X16xeinletports.jpg[/quote]
I then got a C16 XE head and the ports were the same shape but much bigger.

I spoke to Steve from SBD and he said that the later heads had triangular ports(which i'm guessing yours is) and he said he's had cracking results from them.

[Adam]

Aye, C16 heads have slightly larger ports, hence there few hp more power.

Some XELs probably had the remaining heads from other engines fitted, i know a few had the x14xe head fitted(which has ports same as in that pic/\), ive seen them in scrappies with 1400 16v heads fitted...

And aye, the pic MC posted is the triangular port head which apparently flows much better.

[Adam]

Larger pic of my x16xe head
http://img.photobucket.com/albums/v86/Nova-crew/X16xeInletPorts-1.jpg

[MC]

Problem we have now is the old manifold from the TB's could have been opened up to match quite easily, but as the old head had been worked on the ports on the manifold are actually larger, so I need to open the ports up on the XEL head. I had planned to not open the engine up so I'm working on ways of porting the head without swarf getting in the bores. I have a cunning plan! The manifold will need work too. Doh.

The old 1400XE head:
http://i245.photobucket.com/albums/gg54/MC1978gti/28032008505.jpg

[t45_ste]

http://www.sbdev.co.uk/Main.htm :thumb:

[Adam]

So your matching the 1400 head to the tb inlet, and then fitting the 1400 head?

[MC]

Sorry for the confusion,

The throttle bodies are off CP's old X14XE engine. I have a new X16XEL engine for them to go on. I need to match the Manifold to the X16XEL head.

SBD only list a manifold for the XE and if I can save ?134 +VAT I will.

MC

[Adam]

Ahh right, i get you.

So you bought Cp's old tb setup? Nice :cool:

[Stuart]

use an ally spacer plate to merge the two port sizes...

[MC]

Could do, could cut the flange from the standard manifold. Won't be ideal though, the port will get 5mm narrower over 10m. Not pretty.

I am going to block the ports with cloth, and rotate the engine on the stand so the ports face the ground. Then lay underneath and grind away (with glasses on!). Gravity should stop any crap getting in the bores. Best idea yet me thinks.

MC

[Stuart]

Could do, could cut the flange from the standard manifold. Won't be ideal though, the port will get 5mm narrower over 10m. Not pretty.

I am going to block the ports with cloth, and rotate the engine on the stand so the ports face the ground. Then lay underneath and grind away (with glasses on!). Gravity should stop any crap getting in the bores. Best idea yet me thinks.

MC

get a 20-25mm plate cut out to suit.... saves yer vision lol

[MC]

Thought I'd let you know what I did. I'll post pics later.
1. Bought a new XEL gasket and sat it on the enlarged XE manifold.
2. Trimmed the gasket to make it larger in the areas that matched the XE manifold and checked I didn't need the same on the XEL head.
3. I then ground the inlet manifold out to match the gasket.
4. Finally put the gasket on the head and ground the head to match it.

Everything all matched perfectly.


MC

[Adam]

Cool, so now everything has XEL shaped ports?

[meritlover]

i think the c/x16xe basically has round ports and the triangular shape is to allow the twin squirt injectors to aim more into the back of the valve to keep it cool and reduce drop out.

the XEL port is FAR more trianglulated. i suppose it would flow better as the air speed would increase at the top of the port/innermost part of the valve seat. it looks a nice port

[Adam]

The XEL has exactly the same injector position/design as the c/x14/16xe.
The XEL port was probably designed to as you said, increase air speed, helping torque

[MC]

The final shape is a hybrid.

If I'd just been matching an XE manifold to the head, both would be XEL shaped, but the manifold was enlarged and I needed to take a fair bit out of the head, mainly in the bottom corners.

This pic shows what had to be taken out of the head.

http://i245.photobucket.com/albums/gg54/MC1978gti/03042008532.jpg

MC

[Adam]

That was a fair bit of material to remove there. So all matching now?

[MC]

Pretty good, CP pointed out a few areas that could be better!

MC