92mm bore I believe. Darton makes 92mm sleeves, but as for 92mm pistons...

 

I know many 'high end power' 2.3L.

You are getting some incorrect info.

- Drew

 

Are there pistons out there to bore out your 2.0L block and get a 2.2L engine?

Self-boring pistons, like self-tapping screws? Hmm, now there's an idear.
:lol:

I saw a power chart where a 2.2L had the torque of a 2.3L...

Though they are similar in displacement, the longer stroke of the 2.3 is the major influence of that torque. You are correct about the the slightly higher rev-happy nature of the shorter-stroke 2.2 however. Power should be similar.

This does sound like a viable alternative to swapping in a 2.3 when one wishes to use their 2.0 block. and yet gain some displacement...

:thumbup:

 

i would take a bored out 2.0 anytime, high RS ratio plus a low stroke makes a really high RPM loving motor...

what i lose from torque i can compensate with horsepower up high in the powerband

 

Guys,

The stock 2.0 & 2.3 Duratec aluminum block cannot be bored out for a performance gain as the sleeves are built into the casting. It's possible to increase it but it would be so small it wouldn't be worth mentioning it.

If you want more displacement it's easy, get the 2.3L engine.


Thanks,
Vik

 

What do you know about such things, TV Star?

 

^ ^ ^ :lol:



Wow. Is this your first post in Duratec, T?

 

the sleeves are really cast???? wow, nice info...

but how does Darton succecfully bore it to 92 mm, and is it really true?

 

Not that the sleeves are cast. The sleeves are just not designed to be taken out or machined so their part of the block. There just way too thin and actually use the block for strength. If it was a Honda engine, no problem those are easy to change with larger sleeves.

I'm sure it's possible to bore out the sleeves and install larger ones but for what reason when you can get a larger displacement engine 2.3L for way less $.

 

offcourse perhaps the stockers doesn't like to be bored that much... replacing them with off-shelf ones probebley is a better idea.

yeah, a good cheap way to enjoy the torque from an increased stroke, makes a good street car.

but to me, i'll spend the extra bucks for pistons and sleeves in pursuit of better top end

 

The way I see it is that if the Formula Atlantic cars run 2.3L Cosworth Duratecs at 8250RPM... then I'm not going to even touch a 2.0L when there are 2.3L on the market. Since a 2.3L with the breathing mods makes peak power at redline, I'd hardly think I'd want to pursue anything with smaller displacement.

I fully support somebody doing it their own way, of course.

 

What do you know about such things, TV Star?

:lol: Vik, thanks for the info. I didn't know about the sleeving issues either on the Duratec.

I know that sells stroker kits for upping the displacement on the 2.3's, and 2.0's, but I don't know what the kits contain. I haven't really looked that far.

If something was to happen to my 2.0, I would probably bore it out if pricing was right, and if it was feasible. If not, I'm going to get a 2.3.

 

^^^ A stroker kit just enlarges the crankshaft giving you more displacement. So yes with enough stroke you could get to 2.4L or even maybe 2.5L but I havent really looked into it as I dont think it's even worth it.

Oh and as for boring a Duratec, I dont think that would ever be a better idea then starting with a larger 2.3L from the start. Honestly a 2.3L 16V is more than enough displacement for monster power gains even if you stay NA or go FI.

 

Thanks Vik. Do you know the limits of sleeving/boring a Duratec block though, for those who decide to go with the stroker kit?

 

You can run the stock bore with a stroker kit and avoid all the additional machine work.

Ol' Walter Marcy sure was convinced you could run 2.5L with a stock stroke though, and I will say the man does know his Duratecs.

On another historically siginifcant note, a "cheapie" stroker kit may be available soon. Mazda will be releasing a 2.5L version of the Duratec soon, and shortly after it hits the junkyard it may be possible to do a stroker (or larger bore, I'm not sure which dimension they increased) with all factory parts.

EDIT: Actually my Google searching came up with dimensions. It is both wider AND deeper.. 89 mm (3.5 in) bore and a 100 mm (3.94 in) stroke. Should be here for the 2009 model year... so look for it as soon as 6-8 months from now.

 

Omni, thanks for the info on the 2.5L. All we have to do for that option now is wait.