z16se... c16se turbo...

[ben doodar]

Hi all I'm looking for some advice. I'm planning on doing a c16se turbo build, I have a Courtney manifold and t25 turbo, and I plan to run the engine on omex management.

I've been looking for a c16se but struggling to find 1, but there is millions of z16se engines knocking around obviously I'm not going to bother with the z16se management and I do have a bare e16se inlet manifold and throttle body, as there different. I've read online that the z16se is lower compression to the c16se, which would be ideal for turboing. if I were to find and buy a c16se I would have to lower the compression and ditch the standard management anyway so that's whats making me question if it would be the right engine to buy.

is there anything I'm over looking before I take the plunge and buy an engine?

Anybody have anything to add to the topic?

Cheers Ben.

[brucer]

If they had differant compression it surely wouldnt be an 's' in the engine code??

[Andy]

They dont have different ratios.
i use a z bottom end with a c head.all interchangeable

[Novasport]

An N after the digits is a lower compression engine normally.

[_Jake]

z16 head would be better as they have a bigger combustion chamber. im building one at the moment using corsa vxr pistons and rods and a mix of other parts.

[ben doodar]

So, I've been to my local scrap yard this morning. There was a complete Astra c14se. Do u think the power difference between a turbo'd 1400 and 1600 be much difference? I'm I right in thinking I could put a 1600 head on the 1400 to get lower compression?

Or, I could take the inlet manifold, throttle body, fuel rail, loom sensors etc then convert a single point 1600 engine as it would be easier to find 1.

[turbo-boy]

C14se block with a z16 head will give u a comp ratio of 7.8-1, I made one and was 187bhp at 1 bar, checky threads under k817yrf on mig I did a project thread

[Stuart]

Wow that's a low cr :( must be a swine to get going.

put almost any form of engine management that is it for purpose (not a piggy backed or rising rate for guff) and you can run 10:1 with ease

[ben doodar]

187 bhp would be ample lol what compression ratio is the standard c14/c16se?
I'd want drivability, with such low compression was it not a bit of a pig to drive at low speed around town etc turbo boy? + ill have a read of the thread on migweb.

it'll be having omex management.... When it's finally finished.

[ben doodar]

What mangement did you use turboboy?
How long did you run the car for?

[turbo-boy]

Did did over 10k and is still going, as for low compression all this idea of it hard to get going is aloud of bull, I have had quite a few low comp setups and u couldn't tell the different in driving it of boost, I have a 5th and 6th injector setup with wide band

[Stuart]

It's more that I wouldn't bother getting in a faff over making a low comp engine for boost if you use proper management that's all.

[meritlover]

stuart is right.
the obsession with calculating engine combinations for compression ratios and not building them is phenomenal. Then either an arbitary distributor/carb/injection system is bolted on followed by 10 pages of how it doesnt run properly.

The gains offered by well calibrated fuel and spark over the map will outweigh a so called 'optimum' CR tenfold and give greater driveability. If you compare CRs across different performance engines you will see just how different they can be so clearly there are other factors at play such as combustion chamber shape/burn pattern etc, yet no one understands or gets so obsessed by that.

[Andy]

Because all folk are interested in is brakehorsepower figures to be an internet hero.

[Stuart]

Because all folk are interested in is brakehorsepower figures to be an internet hero.


There is this too.
simply get a massive terbow add lots of injectors and hope for the best with a cr of 1:1

Modern boosted engines are running 10:1, sensible sized turbines and well controlled which is achievable with even the povertiest ecu about now. :)

[Edd]

Standard ecu with a rising rate regulator FTMFW

[turbo-boy]

It didn't cost me anymore money making it low comp (static compression) as all this can change with cam/timing, if everyone had money yes we would all by an aftermarket ecu, there is cars now running 14-1 comp ratio with turbos, but when u can build a we run about for turbo for £ 350 and is reliable to an extent

[ben doodar]

Well I've been and had everything I wanted off the Astra today. Loom and ecu, although I probably won't use them I thought it maybe useful to build the omex loom, or if I ever want it to run N/A. also took the inlet manifold, throttle body, tps, coil pack, crank sensor etc. plan is to find an engine maybe z16se or a x16sz (I think) I've said it loads of times before I'd rather a car that will be nice and drivable reliable, i Don't want massive power I'd be happy with 150bhp. I Will run omex although its expensive it should make the car useable. I know an omex dealer thru work who will be able to help and advise me with that.

[craig green]

If they had differant compression it surely wouldnt be an 's' in the engine code??

The L,S or X etc in the engine code denotes the 'window' of compression ratio not a specific amount.

Btw, anyone thinking of a homebrew turbo engine should get hold of a book by Corky Bell, called 'Maximum Boost'. Very informative beyond what most would understand, but an excellent tool with great basic info & inspiration.