Section cut C20XE-C20LET head pictures?

TELVM · 23-01-2007, 13:59

Hi. I wonder if there are any pictures of a sectioned C20XE/C20LET cylinder head. I'd be particularly interested in a section cut following this transverse plane, right between the valves:

Thanks in advance.

chip · 23-01-2007, 14:01

Interesting topic, will watch this one

Add_Gee · 23-01-2007, 14:18

Any good? i know its not mid cylinder...

**Nobbie** · 23-01-2007, 14:39

I think Gary donated a porus head to be cut up, search for posts from Gary.

TELVM · 23-01-2007, 15:37

Thanks Ad_Gee.

Tech drawings I found on the internet. Add some light but not yet what I need:

chip · 23-01-2007, 15:48

What is it you need?

**Nobbie** · 23-01-2007, 15:49

Check this

http://www.migweb.co.uk/forums/mecha...ary+Porous+Pic

TELVM · 23-01-2007, 16:01

Quote:

Originally Posted by chip

What is it you need?

The thickness of metal in the marked areas until you hit water.

Gary · 23-01-2007, 16:10

the head I had cut was to investigate the oilway/waterway cracking issue - so the cut wasn't anywhere near those areas.

chip · 23-01-2007, 16:26

Quote:

Originally Posted by TELVM

The thickness of metal in the marked areas until you hit water.

Is that so you can open them up to drop the CR, or skim the hell out of it to raise the CR, or for some other reason?

(sorry to be nosey, but sounds interesting!)

lee303 · 23-01-2007, 16:28

got one at the garage cut across the chamber like that, will dig it out and take a pic when i get a chance

TELVM · 23-01-2007, 18:43

Quote:

Originally Posted by lee303

got one at the garage cut across the chamber like that, will dig it out and take a pic when i get a chance

I'd be grateful would you be so kind Lee303

.

Quote:

Originally Posted by chip

Is that so you can open them up to drop the CR, or skim the hell out of it to raise the CR, or for some other reason? (sorry to be nosey, but sounds interesting!)

Don't worry for asking. I need to know the thickness in those areas to be sure I will not hit water when cutting this:

TELVM · 25-01-2007, 19:30

Did you find that slice Lee?

rodgerq · 25-01-2007, 20:14

whats the cut for?

rodgerq

lee303 · 25-01-2007, 20:15

Quote:

Originally Posted by TELVM

Did you find that slice Lee?

not yet, will be up there this weekend though so should be able to get some snaps then

sbd16vastra · 25-01-2007, 20:15

what is the idea behind those cuts never seen anything like that before

wayne451 · 25-01-2007, 20:22

Quote:

Originally Posted by sbd16vastra

what is the idea behind those cuts never seen anything like that before

I remember reading something on an American site and its primary reasoning was for fuel consumption, although there were other benefits that I forget!?!?

Nemesis · 25-01-2007, 20:28

Are you sure he's not just testing the depth to see if there is a water jacket underneath? ie he can weld up a slit, but not a whole area that's been rubbed back!

0ddball · 25-01-2007, 20:33

the slits are meant help channel the compressed fuel and air into the spark plug area. i.e "squish"

not such a big deal on pentroof (V) 16v chambers since the charge gets pushed to the plug anyway. i think the other thread with these modifications to kidney shaped 8v heads are much more effective and a bigged deal.

Nemesis · 25-01-2007, 20:42

Quote:

Originally Posted by 0ddball

the slits are meant help channel the compressed fuel and air into the spark plug area. i.e "squish"

not such a big deal on pentroof (V) 16v chambers since the charge gets pushed to the plug anyway. i think the other thread with these modifications to kidney shaped 8v heads are much more effective and a bigged deal.

(edited)

... beat me to it

Blydenstein don't do this mod on the XE/LET engines do they? Neither do any of the major tuners?

Rs1 · 25-01-2007, 20:48

Is it gonna be left at just the slits thought? Or is he gonna machine it away to make the chamber completly round....upto the marking on the face? Therefore there will be no slits when its finished perhaps, just a larger combustion chamber??
Good **** though, crack on.

rodgerq · 25-01-2007, 20:55

surely they slits, left like that, provide a way for the mixture to escape from the combustion chamber and generally a leaky combustion chamber. or am i not thinking straight here:

rodgerq

wayne451 · 25-01-2007, 20:57

How? They would sit inside the fire ring of the gasket!

Nemesis · 25-01-2007, 21:02

A slit like that would also have several sharp edges = det hotspots.

rodgerq · 25-01-2007, 21:02

Quote:

Originally Posted by wayne451

How? They would sit inside the fire ring of the gasket!

seeeee, i told you i could be thinking wonky

rodgerq

23-01-2007, 13:59	#1
TELVM MIGWeb User Join Date: Nov 2004 Drives: Calibras 8V & Turbo iTrader: (0) Posts: 50	Section cut C20XE-C20LET head pictures? Hi. I wonder if there are any pictures of a sectioned C20XE/C20LET cylinder head. I'd be particularly interested in a section cut following this transverse plane, right between the valves: Thanks in advance.

23-01-2007, 14:01	#2
chip MIGClub Member Join Date: Apr 2002 Location: Southwest Drives: Like its stolen iTrader: (5) Posts: 31,945	Interesting topic, will watch this one __________________ For no nonsense hardcore vauxhall modifying advice: www.VauxSport.com My Total-Vauxhall Magazine Staff Nova in the www.VauxSport.com garage My Total-Vauxhall Magazine Staff Calibra in the www.VauxSport.com garage

23-01-2007, 14:39	#4
Nobbie Central Regional Coordinator / Moderator Join Date: Nov 2001 Location: Hemel Hempstead Drives: Mk3 Astra GSi XE iTrader: (3) Posts: 10,556	I think Gary donated a porus head to be cut up, search for posts from Gary. __________________ Central Region Co-ordinator Central Region Forums/Events

23-01-2007, 15:37	#5
TELVM MIGWeb User Join Date: Nov 2004 Drives: Calibras 8V & Turbo iTrader: (0) Posts: 50	Thanks Ad_Gee. Tech drawings I found on the internet. Add some light but not yet what I need: Last edited by TELVM; 23-01-2007 at 15:53.

23-01-2007, 16:10	#9
Gary MIGWeb User Join Date: Jun 2000 Location: Swindon iTrader: (1) Posts: 11,503	the head I had cut was to investigate the oilway/waterway cracking issue - so the cut wasn't anywhere near those areas. __________________ Keep I.D out of Science: http://bcseweb.org.uk

23-01-2007, 14:18	#3
Add_Gee MIGClub Member Join Date: Mar 2002 Location: Birmingham Drives: BMW 320d (E46) iTrader: (6) Posts: 7,577	Any good? i know its not mid cylinder...

23-01-2007, 15:48	#6
chip MIGClub Member Join Date: Apr 2002 Location: Southwest Drives: Like its stolen iTrader: (5) Posts: 31,945	What is it you need?

23-01-2007, 15:49	#7
Nobbie Central Regional Coordinator / Moderator Join Date: Nov 2001 Location: Hemel Hempstead Drives: Mk3 Astra GSi XE iTrader: (3) Posts: 10,556	Check this http://www.migweb.co.uk/forums/mecha...ary+Porous+Pic

23-01-2007, 16:28	#11
lee303 MIGWeb User Join Date: Feb 2003 Location: ruislip Drives: nova 1.8 16v on tbs iTrader: (4) Posts: 16,002	got one at the garage cut across the chamber like that, will dig it out and take a pic when i get a chance

25-01-2007, 19:30	#13
TELVM MIGWeb User Join Date: Nov 2004 Drives: Calibras 8V & Turbo iTrader: (0) Posts: 50	Did you find that slice Lee?

25-01-2007, 20:14	#14
rodgerq MIGWeb User Join Date: Jan 2002 Location: ayrshire scotland Drives: like a saint-9points iTrader: (43) Posts: 22,102	whats the cut for? rodgerq __________________ thick red - battery, thin black - igntion switched feed, thick red/blue - fuel pump, brown/blue - ecu light. thin green - rev counter.

25-01-2007, 20:15	#16
sbd16vastra MIGClub Member Join Date: Aug 2003 Location: gosport/swindon Drives: wife around the bend iTrader: (9) Posts: 6,195	what is the idea behind those cuts never seen anything like that before __________________ ''THE REAL ROB''

25-01-2007, 20:28	#18
Nemesis MIGWeb User Join Date: Sep 2004 Location: Nottingham Drives: Calibra touring car iTrader: (95) Posts: 26,549	Are you sure he's not just testing the depth to see if there is a water jacket underneath? ie he can weld up a slit, but not a whole area that's been rubbed back! __________________ Diet Nemesis

25-01-2007, 20:33	#19
0ddball MIGWeb User Join Date: Jan 2001 Location: Northeast Kent iTrader: (11) Posts: 28,776	the slits are meant help channel the compressed fuel and air into the spark plug area. i.e "squish" not such a big deal on pentroof (V) 16v chambers since the charge gets pushed to the plug anyway. i think the other thread with these modifications to kidney shaped 8v heads are much more effective and a bigged deal.

25-01-2007, 20:48	#21
Rs1 MIGWeb User Join Date: Dec 2004 Location: Newcastle Drives: LET...coming soon iTrader: (10) Posts: 7,803	Is it gonna be left at just the slits thought? Or is he gonna machine it away to make the chamber completly round....upto the marking on the face? Therefore there will be no slits when its finished perhaps, just a larger combustion chamber?? Good **** though, crack on. __________________ "THE ROB"

25-01-2007, 20:55	#22
rodgerq MIGWeb User Join Date: Jan 2002 Location: ayrshire scotland Drives: like a saint-9points iTrader: (43) Posts: 22,102	surely they slits, left like that, provide a way for the mixture to escape from the combustion chamber and generally a leaky combustion chamber. or am i not thinking straight here: rodgerq

25-01-2007, 20:57	#23
wayne451 MIGClub Member Join Date: Jan 2005 Location: In the mod room... Drives: Pie truck to OHC's iTrader: (35) Posts: 20,420	How? They would sit inside the fire ring of the gasket!

25-01-2007, 21:02	#24
Nemesis MIGWeb User Join Date: Sep 2004 Location: Nottingham Drives: Calibra touring car iTrader: (95) Posts: 26,549	A slit like that would also have several sharp edges = det hotspots.