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gunny
04-09-11, 10:07 PM
Right I know theres been posts on this before so keep the cocky comments and links to yourselves please as yes, I have read through them.

Basically I want to confirm the information I'm probably misinterpreting.

We have here an X16XE engine, from what I've been reading am I right in thinking that using an XEL head from an X14XE with the 1600 cams from a C or X will give better gains than a C16 due to the port design.

Any other advice welcome.
dstevenson
05-09-11, 09:58 AM
Think you are right about the head being better on the "later" engines but don't think it matters 1400 or 1600. Check the SBD website where they have a section on the heads, casting no's, etc. of the best head as regards port shape. They state that the early C type are good but the latest triangular ported heads are the best.
I don't think there is any significant difference in the cams between C/X and 1400/1600.
gunny
05-09-11, 11:06 AM
Ok I'll check it out.

Well we have a late x16 and it doesn't have the triangular ports.
philip
05-09-11, 11:10 AM
most engine builders stick with the c or x16xe heads tbh, not actuially seen any big powered small blocks using the triangular ports as yet
gunny
05-09-11, 11:30 AM
Ok.

Another one, I'm sure the corsa VXR pistons go straight in, can anyone confirm this?
Adam
05-09-11, 08:24 PM
The XEL head is better, but its standard inlet is shi**er than the c/x16xe one.
wwmnw
05-09-11, 10:17 PM
X16XEL head is the best due to the internal shape even after port and polishing, that's taken from SBD's website.

I've also read the cams are no different but the L in XEL apparently means low output (possibly meaning power wise as it is 100 BHP which is less than the X/C16's)

P.S I have a full head from an X16XEL sat doing nothing.
gunny
05-09-11, 11:40 PM
Is the 16XEL the one with the triangular ports?

Which has the best inlet, the C16?
Southie
06-09-11, 12:23 AM
Apparently the xel head is better for air flow than the rest, what are you planning building Gunny?
I had a c16 and it seemed in standard form far far better than my mates x16l but when he put a budget air box on he got a totally different rev range on his x16xel to my Mantzeled c16xe. Tbh. I think it's also down to the cams you use and the mapping, I had apparently had reprofiled gm cams which I'm sure made a difference.
gunny
06-09-11, 11:47 AM
The flow of the head is essential really for what we have planned. Kent cams are in the pipeline.
wwmnw
06-09-11, 11:52 AM
http://www.pngclub.com/forum/showthread.php?95632-X16XEL-Inlet-Ports
gunny
06-09-11, 12:29 PM
Yeh I've seen that thread, that's the one.
phazer
06-09-11, 01:38 PM
I've also read the cams are no different but the L in XEL apparently means low output (possibly meaning power wise as it is 100 BHP which is less than the X/C16's)


Yes, the lower output is due to it being fitted to bigger cars than the XE (Astra Mk3, Vectra etc), the mapping and inlet etc I guess would have been designed for this reason. The XEL makes higher peak torque than the other baby XE's as standard.
gunny
06-09-11, 01:54 PM
A couple of you have mentioned the mapping now, guessing different models different ecu's?
Adam
06-09-11, 03:25 PM
XEL had x14xe cams in too
phazer
06-09-11, 10:07 PM
A couple of you have mentioned the mapping now, guessing different models different ecu's?

Same ECU as the X16XE, different map chip inside.