2.7 Query

[Corrado1441]

Ok not sure if I'm in the right place, I have acquired a 1989 325i Sport in Red with cream interior.
The car has a 2.7 conversion done and the guy who got the work done when he owned the car(not the guy I bought it off) gave me the following non-technical info, which I would like in technical form should I decide to sell.

Bottom end from a 1988 BMW 525
Fitted pistons and rods from the 325i engine
Decked the block as it was low compression, can't remember by how much to make it high compression.
Fitted the 325i head
Fitted 6 branch manifold
Stock 325i cam
New top bearings in bottom end
New cam pulley
Chip for 2.7
At a later date head was rebuilt

Diff also rebuilt to 40% lockup

Mechanics are not my strong point, I would just like to have an understanding for potential buyers as the car will probably be sold as I swapped it for another car I had for sale.

Thanks for any help.

[Corrado1441]

Sorry just found 2.7 engine build sticky my bad
We're would I find the engine number so I know what block/head was used ?

Thanks

[Brianmoooore]

Engine number is on a flat surface near the LH engine mounting arm.

[Corrado1441]

Thanks Brian, just trying to make sense of all this engine stuff that's been done.

[Corrado1441]

Ok am looking at car, left hand side engine mount is beside oil dipstick and above dipstick I see large numbers 84.
Where in relation to this is number for the engine block so I can check its from a 525.

Thanks, sorry for the silly questions

[Speedtouch]

To the right of the inlet side engine mount, just above the block:sump interface, on a machined flat. You may need to wire brush/Jenolite it to see the numbers.

Should be 27 6E or similar, indicating 2.7 eta block. This can be checked in RealOEM:
http://www.realoem.com/bmw/showparts.do ... g=11&fg=05

[Ant]

take dizzy cap off, you're looking for a vernier pulley for a proper full fat built 2.7.

[Corrado1441]

Cheers Brian
Cheers Speedtouch

Ant ????

[HairyScreech]

any proper 2.7 build will have had the block skimmed down enough that the timing would be out a little so a vernier cam pully must be used to correct the cam timing.
it works out to about 1/2 a tooth out so around 4 degrees iirc.

edit, that is if it has used 325 pistons and an 885 head (should always be used together)

[Corrado1441]

Guy that got the engine built has no technical info just what he can remember off the top of his head.
So far looking at the block and what he told me I have found that,

The block is a 27 6EB with new bearings and skimmed
Rebuilt 885 head from the original engine from the car using the standard camshaft
Using the pistons and rods from the original engine from the car
He said it got a new camshaft pulley but not if it was adjustable or not, I now realise from rest of work it had to a vernier pulley
Was also fitted with a new 6 branch manifold, scorpion stainless exhaust and Uprated chip

[Ant]

stock 325 rods are 135mm, B20 and Eta use 130mm rods

2.7 uses 81mm crank, so its either :-

a: stock Eta bottom end with 885 head

b: Eta block with 885 head, B 25 pistons and Eta/320/323 rods + Decking and vernier

there is no C combo without spending approx 3K minimum

Defo an Eta block there though.

adjustable cam pulley is the only easy way to "know" unless you have a borescope ?????

[Corrado1441]

It's an Eta block and the original 325i (885) head, with the 325i pistons, so the builder must have used the rods from the Eta block because previous owner said the block had been decked.
So Ant it must be option "B"

Ah well at I now know what's living under the bonnet!!!

Cheers guys