borin out a m20 325

[steveyboy]

im just wonderin would it be possible to bore out a 2.5 to a 3.0, im unsure if this possible so thats why im askin,

cheers in advance for help,

[oakey]

i have seen 3litre stroker kits for sale on the web before. but cant help you any more than that

[eko]

Pretty sure E30Adam has done his to 2.8?
Maybe worth searching under his name or maybe even just PM him to find out!

[Steve]

Pretty sure E30Adam has done his to 2.8?
Maybe worth searching under his name or maybe even just PM him to find out!

or Andyboy as he built it and Adam bought it off him

[eko]

or Andyboy as he built it and Adam bought it off him

Good call,didnt know that.

[Steve]

Adam's spec

Engine & Transmission: 2.8 litre M20 with modified pistons & E36 328i crank, Schrick 284\272 camshaft, Schrick dual valve springs, Dastek unichip & remap, MAF conversion, oversized throttle body, FSE adjustable [fuel pressure regulator & guage, Scorpion full stainless steel exhaust system, polyurethane engine mounts, Getrag 260/5 sports gearbox with Z3 short-shift conversion, 25% locking 3.91 ratio Limited Slip Diff

[Templ8e30]

You can't bore it out to 3 litres, there's not enough metal between the cylinders to do it.

You could bore it out a little but would need a longer throw crank and rods, pistons etc to get close.

Cheers,

Iain T

[steveyboy]

You can't bore it out to 3 litres, there's not enough metal between the cylinders to do it.

You could bore it out a little but would need a longer throw crank and rods, pistons etc to get close.

Cheers,

Iain T

hmm that is wat i thought not enuff space in the block, does any 1 no wats the most they can be bored to ???

[kam-325i]

i would guess to around 85mm, maybe 86mm Max.....

[Brianmoooore]

Nothing really, and still retain reliability. Fire rings on the gasket are nearly touching each other as it is.

[Simon13]

the only way is a longer throw crank for extra cc really

[E30Adam]

Ireland Engineering do stroker kits for 2.9, 3.0 and 3.1 litre M20's!!

https://secure19.nexternal.com/shared/S ... oducts.asp

[snoops]

lol

[E30Adam]

lol

What a useful piece of information to add to this thread. Did you find something funny?

[WillG]

yeah probly the price yeah 85mm is most you can bore out to but its not worth it

[E30Adam]

When you consider the exchange rate, about a grand is actually a pretty good price for what you're getting!

If you're talking about proper mods, you've got to realise it's gonna cost proper money. It's a bit different from bolting a K&N on and expecting the 10bhp gain they state on the box.

[Turbo-Brown]

Ooh, that Ireland Engineering site's a dangerous place!

Anyone know what the stroke of their 2.9 is? Quite interested in their bit about you being able to spec any bore and CR too, and having the option for stonger rods for another $600 is pretty appealing too.

Hmmm, ignoring tax and shipping that's only £1160 for an all steel bottom end and forged pistons!

To say I'm tempted is an understatement!

[E30Adam]

They certainly sell some awesome stuff.

The best thing is to call and speak to Jeff. It's not too expensive to call the states but bear in mind the 5 hour time difference.

[Turbo-Brown]

Just sent them an email about the bore and compression options

God I wish I hadn't seen that site!

[steveyboy]

adam could you send me some info on your 2.8 , wat block you used , pistons crank rods etc

[steveyboy]

that site is very good and i agree that the prices are excellent aswell,

[Templ8e30]

The 3.1 stroker kit has an 89.6mm stroke

That's gonna be one slow revving motor.

'performance beyond a E36 M3' I think not

Cheers,

Iain T

[Turbo-Brown]

Says you keep the 135mm rods for all of those kits though doesn't it?

The gudgeon pins must be miles up the pistons!

[E30Adam]

adam could you send me some info on your 2.8 , wat block you used , pistons crank rods etc

All the info's in Steve's post at the top mate. Stock M20 block and pistons were used.

For the money it costs to do this you're better off putting an M50B28 engine in, 24valves too!

[steveyboy]

so adam roughly what bhp is yours puttin out ??? sorry if im bein nosey lol

[e21Jason]

Hi

The Ireland & MM kits take the block out to 86mm and use pistion whith a taper at the top to clear the head gasket ring

Jason

[Turbo-Brown]

I emailed Jeff at Ireland to ask about the pistons and he said you can have them in any bore you like so if you're anal enough to have a 2 litre block bored out to 84mm (and I am), you can use bits designed for the 2.5 engine such as head gaskets and the like.

Does only give you a 2.8 if you get their 2.9 conversion though.