the redtop and iron eco combustion chambers are both 43cc :(

gse_turbo · Post by **gse_turbo** » Thu Nov 29, 2007 8:16 pm

does anyone know the cc volume of the combustion chamber on the C20XE or like head?

if no one knows the exact number is the XE combustion chamber bigger than the XEV?

if no one knows that, what is the estimated compression ratio in an XEV motor with XE pistons?

garrett

gse_turbo · Post by **gse_turbo** » Fri Nov 30, 2007 5:20 pm

no one has specs on the XE head!?

Pir0 · Post by **Pir0** » Fri Nov 30, 2007 5:25 pm

Are the specs located on the head or what? My friend has an XE and an LET. I could ask him? But i'm not sure myself

gse_turbo · Post by **gse_turbo** » Fri Nov 30, 2007 5:44 pm

Pir0 wrote:Are the specs located on the head or what? My friend has an XE and an LET. I could ask him? But i'm not sure myself

well if your friend has had any major engine work done they should have measured it but outside of that the only place the specs would be is in a tech manual, if that.

thank you in advance for asking you friend.

garrett

Pir0 · Post by **Pir0** » Fri Nov 30, 2007 6:33 pm

What exactly is you're planning on doing?

Are you putting redtop pistons into a 2.0 ecotec block with a 2.0 ecotec head?

As far as i know, all ecotec blocks etc were based on a 1.8 block that stems back to the Opel Manta, the redtop and 2.0 ecotec blocks are the same.

I'm not the best with compression ratios, but seeing as the engine code for the redtop is c20xe, and the ecotec 2.0 is x20xev, the 'x' after the 20 represents the CR of the engine? both being 10.0 ≤ x < 11.5, wouldnt putting xe pistons into an ecotec block just be something very similar? Or are you after that ± 1.5?

Where my car is atm, the garage is owned by a guy who knows Vauxhall inside out, so he might know more about compression ratios and swapping xe parts for xev etc, for example I think he's using an xev block with an xe head on his redtop turbo atm.. [with 2 head gaskets for the lowered compression]

I'll try my best to find out some more about this for ya

gse_turbo · Post by **gse_turbo** » Fri Nov 30, 2007 6:53 pm

Pir0 wrote:What exactly is you're planning on doing?

Are you putting redtop pistons into a 2.0 ecotec block with a 2.0 ecotec head?

As far as i know, all ecotec blocks etc were based on a 1.8 block that stems back to the Opel Manta, the redtop and 2.0 ecotec blocks are the same.

I'm not the best with compression ratios, but seeing as the engine code for the redtop is c20xe, and the ecotec 2.0 is x20xev, the 'x' after the 20 represents the CR of the engine? both being 10.0 ≤ x < 11.5, wouldnt putting xe pistons into an ecotec block just be something very similar? Or are you after that ± 1.5?

Where my car is atm, the garage is owned by a guy who knows Vauxhall inside out, so he might know more about compression ratios and swapping xe parts for xev etc, for example I think he's using an xev block with an xe head on his redtop turbo atm.. [with 2 head gaskets for the lowered compression]

I'll try my best to find out some more about this for ya

OOO

i'm slighty embarassed! i forgot my answer was infront of me the whole time. the "X" is reference to the compression ration.

i was thinking of putting XE pistons into an an eco motor, ours here have 9.6:1-9.5:1

well thanks for the kick in the head, i need one of those from time to time!

gse_turbo · Post by **gse_turbo** » Fri Nov 30, 2007 6:58 pm

i got to thinking more about it and its true that the compression ratios are going to be the same on an XE and XEV but if the chamber volume if the eco head is smaller then the redtop that just means the the compression ration is adjusted by the piston.

if the CR is the same in both but the dish in the redtop is smaller then the eco and the head is bigger then the eco you could swap redtop pistons into an eco for an even higher CR then 11.5:1

Pir0 · Post by **Pir0** » Fri Nov 30, 2007 10:50 pm

Well you're in luck, my friend let me take a load of pictures of my friends Coscast redtop head up at his house this evening.

Hope this helps a bit

Yummy

The inlets are the slightly larger valves

Inlets

Outlets

If you can get a picture of an xev piston i could get a picture of the xe pistons, my friend has 3 spare at his house aswell.. It didn't dawn on me to take a picture of them

gse_turbo · Post by **gse_turbo** » Fri Nov 30, 2007 11:12 pm

actually what you have there will get me the exact info i need!

i need you to measure the combustion chamber, if you haven't done this before here's what i need you to do...

• get a piece of clear plexiglas/ acrylic... whatever you can
• find a syringe that measures 50cc or more (a farm supply shop is a good start)
• drill a hole in the plexi just big enough for the syringe tip to fit
• clean the head service
• put a small amount of oil around one of the cylinders
• set the plexi in place, the plexi will stick, you will need a spark plug for the next step
• fill the syringe to exactly 50cc or what have you
• now using a colored liquid, washer fluid will work, fill the combustion chamber using the syringe
• record the amount of water i took to fill the combustion chamber, it should be between 30cc and 45cc

cheers mate, thanks for the help!

Pir0 · Post by **Pir0** » Fri Nov 30, 2007 11:30 pm

I'll try my best, have to ask my friend for a loan of his precious coscast head for it.

And by combustion chamber you mean the circular bit with the inlet/outlet valves?

I've just never actually heard that term being used before for it, when you say combustion chamber i automatically think of the piston chambers in the block

gse_turbo · Post by **gse_turbo** » Fri Nov 30, 2007 11:45 pm

Pir0 wrote:...by combustion chamber you mean the circular bit with the inlet/outlet valves?

I've just never actually heard that term being used before for it, when you say combustion chamber i automatically think of the piston chambers in the block

you've got it, while you're doing thyis it should sit just like this but with the spark plug in

i think i've given the best step by step i can so it should go pretty smooth, there's nor rush so if you can't get to it for a couple days then no big deal.

thanks again.

Pir0 · Post by **Pir0** » Fri Nov 30, 2007 11:48 pm

I found something you might want to read

http://www.migweb.co.uk/forums/vauxhall ... 50109.html

It says there stock XE head has a 43cc combustion chamber

gse_turbo · Post by **gse_turbo** » Sat Dec 01, 2007 12:12 am

nice find, that would at least comferm what one of the other guys from mig told me.

i'll have to back over the numbers from whaen i did this for my eco head but i'm almost posative that it was 30cc.

now to figure what he CR will be with XE pistons in an eco motor, should be over 11.5:1 perhaps 12.0:1.

thanks for the help. cheers

Pir0 · Post by **Pir0** » Sat Dec 01, 2007 12:28 am

No problem m8, anytime

I thought the XE and XEV pistons were the same in shape?, maybe different gouge for the valves but in general i thought they were the same

gse_turbo · Post by **gse_turbo** » Sat Dec 01, 2007 12:33 am

sounds like the CR is the same 10.5:1 but with the different volume in the head the pistons would have to be different.