Alpina help

Post Mon Sep 05, 2005 5:16 pm

Have just stripped my alpina head down ready for the rebuild its the correct head has a 4 numbers stamped on the inlet side at the front nearly missed them cause they are quite small, dont know what to look for on the camshaft anyone had a good look at onefor marks and lettering J.

Post Mon Sep 05, 2005 5:23 pm

I think there are some markings on it. Best speak to Sytner and ask them where they would be.

Considered doing anything extra to the head? Maybe a bit more porting, 5 angle valve seats, better cam (272/272 or 284/272). The Alpina cam is quite tame.

Post Mon Sep 05, 2005 6:09 pm

Would i be able to do these mods myself? is there a tread on how to do it? J.

Post Mon Sep 05, 2005 6:19 pm

I also have 2.7 eta crank would it be worth putting this in?

Post Mon Sep 05, 2005 6:42 pm

You dont have a 2.7 Alpina engine? Where did you get the head from?

If you have the crank put it in while its all open.

Use early 325i pistons with 320i rods. Block will need shaving down a bit (1mm??).

If you go to an engine builder with 1 piston, 1 rod and the block they will do the necessary machining for you. Aim for a compressions ratio of about 10.2:1.

The difference will be very very noticeable!

As for the valve angled seats - I doubt youll be able to do this at home.

With this sort of setup you should break the 200bhp barrier with ease.

Post Mon Sep 05, 2005 6:50 pm

sorry i should have said before my car is an alpina c2 2.5 not 2.7 could i still carry out these mods?

Post Mon Sep 05, 2005 7:35 pm

Jordano, I've just bought a C2 2.5, though mine is the early type based on the 2.3; is yours a later one (2.5 based)?

I'd be grateful for any info you have on the C2 2.5; I've not collected mine yet, but when I do if there's anything you need to know...

Post Mon Sep 05, 2005 7:49 pm

keep ya 2.5 rods and use m50 pistons no block mods required

Post Mon Sep 05, 2005 8:05 pm

mines 2.3 based too but i nthink it works out just over 2.5 bougt mine about 8month ago and have been restoring it since done all the welding thought i would have a change for a bit and work on the engine i have a 2.7 crank and i was asking if it would be worth putting it in or if it would upset the injetion mines ljettronic is yours? J.

Post Mon Sep 05, 2005 8:44 pm

TOURINGDADDY wrote: use m50 pistons

24v pistons with an 12v head ?

Post Mon Sep 05, 2005 8:45 pm

oh yes i've been doin some TOP SECRET research with justin at e-tech motorsport

Post Mon Sep 05, 2005 8:49 pm

So do you machine the pistons so they only have two valve cut outs ?

Post Mon Sep 05, 2005 8:55 pm

Post Mon Sep 05, 2005 9:01 pm

I can't see how its going to work then ?

I'm not having a go, just curious ?

PM me if its hush hush ?

Are you going 2.7 on your touring ?

Post Mon Sep 05, 2005 9:22 pm

From what I understand, the 2.3 based C2 2.5 (2556cc) used the 2.7 crank anyway - that's how they increased the cc, and when the 2.5 came along, they just did the same to create the 2.7.

That last sentence makes sense, honest.

My C2 has a letter from Sytners detailing the conversion - I've had a brief look at it, when I (finally) get the car, I'll have another look.

Post Mon Sep 05, 2005 10:43 pm

could you email me a copy of that when you get it? J

Post Tue Sep 06, 2005 8:33 am

No problem.

Post Wed Sep 07, 2005 8:17 pm

Hey kidsinister and jordano
Could you guys post some pics of your cars, i have been trying to find some good pics of e30 alpina's , but no luck....

Post Wed Sep 07, 2005 9:01 pm

sorry Hypirion but my car is in bits just will post some pics when its finnished. J

Post Thu Sep 08, 2005 10:43 am

I believe the c2 2.5 based on the 323i used the 323i crank with 325i pistons. Thats one source might be wrong though.

I would say stick in the 2.7 crank, you'll defo get something which is near enough a c2 2.7 power or possibly more.

Have you get a 6 branch on there as this really makes a difference.

Post Thu Sep 08, 2005 12:41 pm

Hyperion wrote:Hey kidsinister and jordano
Could you guys post some pics of your cars, i have been trying to find some good pics of e30 alpina's , but no luck....

Haven't even got mine yet! Picking up Saturday, (hopefully) will post pics ASAP.

Post Thu Sep 08, 2005 1:09 pm

Thanks for that m5pilot, yes have got a six branch exhaust do you think putting the 2.7 crank in will make any difference to the fueling? I have also got a full motronic injection and wireing loom was toying swaping it over so i could use chip it what do you think? J

Post Thu Sep 08, 2005 5:30 pm

i'm thinking that the this 2.5 based 2.3 lump already has an eta crank in it, which is how they achieved 2.5 from 2.3

get me?!

Post Thu Sep 08, 2005 8:12 pm

is there any way of checking i have the sump off so can see any numbers on it

Post Thu Sep 08, 2005 10:07 pm

Well according to the ETK, the part number for a 525e crank is:

11 21 1 276 341

If you can see it!