help for 2.7 conv.

[nikos]

using the eta crank and rods with 325 pistons on the TDC the piston should be 1.5 mm inside the bore, face with the block or poke outside?
thank you, nikos

[M5pilot]

Get this sort of thing sorted by an engineering place who can machine everything for you to give you 10.2:1 compression ratio.

You only do these things once so get it done properly and you'll have one hell of a powerful 2.7.

[nikos]

thank you,
I have allready done this but it seems that something keeps the engine from rolling over 5500 and there is a drop of power. I have changed engineer and I try to find what is wrong Removing the head I observe that the piston comes a little out of the border of the block so I wonder if he use the wrong set of rods. On total BMW there is an article mentioning that that with 130 conrod, the one on the eta, the piston should come lower by 1.5 mm so I try double check this before I remove the engine
nikos

[Andy_magic]

What ECU, Injectors, AFM etc are you running.

A bad comp ratio won't give the symptoms you have.

[nikos]

I had a kent cam with the 325 and was ok
now I have a new wiring loom with haltech ecu ,no afm but mass meter and biger injectors and I would expect on the dyno 215 or more Instead I get 150 and 24kgr on 5500 and then it drops I suspect the conrods or the skirts of the pistons are still long

[Karan]

if the skirts were long they would hit the crank webs and explode.....

so when u removed the head was the piston sticking out the top of the block~????????????

it shouldhave been down and u should have had the block skimmed/decked to get the comp ratio right..

wrong rods are a possibility

Karan

[nikos]

karan thank you, I removed the head today and the piston are out about 3mm It seems somebody did the mistake and used the wrong set of rods. tommorow I will remove the block and mesure the rods. You should be wright
nikos

[Karan]

so at top dead centre the edge of the piston was sticking 3mm out the top of the block?????? it should be dead level.......'ish'