2.5 head in a 2.7 on a 2.7 bottom end? lulz help me out guiz

[Pantless Spency]

so me and my buddy were cleaning the crap out of my head and i was informing him about 2.5 head on 2.7 bottom end strokers, he's a vw guy (and a real gear head/machinist) so he was just wondering about it because hes heard of it.
so we talked about it as were cleaning up my 2.7 head.
he says why dont you do 2.5 on a 2.7? i said because i don't want to deal with the wiring and all that jazz bla bla bla,
he then says, well what makes a 2.5 head better? i said well probably the valve springs and the cam.
he goes, well why don't you get a 2.5 cam and 2.5 springs and valves/buckets/lifters/halfmoons/keepers and put it in your 2.7 head, then i wouldn't have to change my harness or anything electrically and it would essentially be a 2.7l bottom end with a 2.5l top end.

this reaaaaaally had me thinking, and since i have my head stripped completely and a cam from pnp is like 30 bucks, i was wondering if this is possible and would it be possible to run the stock harness and all that jazz?
basically make my 2.7 head into an 885 2.5 replica except for the fact its casted as a 2.7 head and built to work with 2.7 air system and electronics and all that jazz.


so would this work and has anyone done it?

[MR 325]

Not worth the trouble to do it this way. The intake & exhaust ports on the 200 Eta head are TINY compared to the 885 head, it just won't flow. The Eta head also uses smaller valves than the i head. Next problem, you'll need to drill out the Eta head for oil flow.

You would be better off swapping a complete 885 head on to your car. You COULD bolt all of the Eta parts (intake manifold, exhaust, sensors, etc) back up to it with no issue. It really is not hard at all to swap a harness and a few sensors, it's definitely worth the trouble.

[Pantless Spency]

hm.
well i already have completely stripped out my eta head and just planned to replace it with eta parts, the I parts wouldn't be to far out of my way.
what kind of gains would i get if any?
and how could i use an eta intake manifold on the 885 if the intake ports arent the same size?
i want something that isn't just an eta..... ive put in some hard work and i want some power hahahaha.

[Pantless Spency]

i just re-read my original post,
and all that jazz.

[jlevie]

hm.
well i already have completely stripped out my eta head and just planned to replace it with eta parts, the I parts wouldn't be to far out of my way.
what kind of gains would i get if any?
and how could i use an eta intake manifold on the 885 if the intake ports arent the same size?
i want something that isn't just an eta..... ive put in some hard work and i want some power hahahaha.

The gains of putting an I cam in the ETA head wouldn't be worth the cost & effort.

If you put an I head on an ETA block you also use the I intake, injectors, throttle body, AFM, harness, CPS, and DME.

[MR 325]

hm.
well i already have completely stripped out my eta head and just planned to replace it with eta parts, the I parts wouldn't be to far out of my way.
what kind of gains would i get if any?
and how could i use an eta intake manifold on the 885 if the intake ports arent the same size?
i want something that isn't just an eta..... ive put in some hard work and i want some power hahahaha.

It's very easy to swap to an i intake manifold, exhaust, sensors, harness, injectors, and AFM. It's very much worth doing, otherwise don't bother trying to mod the Eta engine. The Eta bottom end with 885 head and i Motronic is a good combo and better than a lot of forum people say it is.

Even though the 885 head has bigger ports the Eta intake manifold will still bolt right up to it, just not ideal.

[acolella76]

You will never get the '200' casting head to flow better than the '885' head. You will probably spend over a grand just to get it close. Also, you don't HAVE to swap the harness and stuff over to make the cylinder head work, but it would be pointless not to swap to motronic 1.3.

I think you should go full motronic 1.3/885 head swap. It's not that expensive, and it's just like changing a head gasket. I can post a dyno graph of my 2.7i if that would sway your opinion.

[Pantless Spency]

damn my friends gonna be pissed.
so how much are we looking at and what process from here?
i have the eta head out.

[acolella76]

http://www.r3vlimited.com/board/showthread.php?t=100939

Remove old head and intake
Remove old harness, sensors, and ECU
Make hole in firewall bigger
Install new ECU, harness and sensors
Install new head

[Pantless Spency]

thanks for the link acolella!

[eoddom]

So is it better to have the M20B25....or the eta engine with the 885 head? I've alread got an I car...but no motor. but its already got the wiring for the "I" engine so putting this combo in would be easy.

Which is better though?

[jlevie]

You'll get the best performance from an M20B25 engine as compared to a "budget stroker". A true stroker (different crank, rods, pistons) would be a different matter.

[cheapshot]

You will never get the '200' casting head to flow better than the '885' head. You will probably spend over a grand just to get it close. Also, you don't HAVE to swap the harness and stuff over to make the cylinder head work, but it would be pointless not to swap to motronic 1.3.

I think you should go full motronic 1.3/885 head swap. It's not that expensive, and it's just like changing a head gasket. I can post a dyno graph of my 2.7i if that would sway your opinion.

Please do post that graph. I am collecting parts for this now.

[camip]

Graph please I'm contemplating this also.

[Stoner Sam23]

http://www.r3vlimited.com/board/showthread.php?t=182731

This might help