And it begins...

[z31maniac]

I don't know what happened to my post, but it never mentioned CR.

All I said is that more displacement helps everywhere in the rev range, not just in producing low end torque. Engines are air pumps, more displacement means they can physically move more air.

[akorcovelos]

this is the most off topic thread of all time...:dot:

[rwh11385]

I don't know what happened to my post, but it never mentioned CR.

All I said is that more displacement helps everywhere in the rev range, not just in producing low end torque. Engines are air pumps, more displacement means they can physically move more air.

If he's building a 8.5:1 CR 2.7i, I fail to see the huge benefit for that over a 2.5i, besides torque around town. B25's sing fine on track.

https://www.rif.org

Well, if you had an ability to read, my post was comparing a 8.5:1 CR 2.7i and a stock 2.5i. That's why I said the B25 could still be best for the track... but i guess you didn't understand that and wanted to use a completely irrelevant analogy. All those cc's won't do you as much good on the track where you'd stay above 4000 rpm most of the day, and you're missing out on the positive aspects of a 325i at the track. A low-CR stroker is only good if you are using it for its positive low-end torque quality and flatter curve... or turbocharging it.

[AndrewBird]

Wow, holy off-topic batman.

Rather then guess at what works and gives what compression ratios, why not collect the parts you were planning on, then calculate the compression ratio based off of measurements of the parts. Then you can calculate how much needs to be taken off the head/block to get the desired compression ratio.

Seems stupid to just go with what someone else did and said worked on the internet without looking into it a bit more.

[Julien]

Now... would an 85e bottom end work with e85? hmz?! Cool build anderson, good luck!

Julien

[Rocla]

A stupid question, I'm not familiar with U.s. spec engines or with ETA anyway. What are the long studs on the lef side of the engine for?

I mean the ones on flat surface between timing belt area and the plug for the angle ger for the oilpump.

[backtrail69]

The real early ETAs had a cold start or idle valve mounted off there. My 87 doesn't have those and the 85 block I built my stroker motor with didn't either.