JP's E21 DD

[Hermes]

Is that a typical practice...to machine the rod caps? Seems like it'll be out of round if you do that.

Sent from my Nexus 6

Yes. It doesn't matter much but since we're going for maximum tolerances it has to be perfect. Ben builds race engines and is anal so we just do what he wants.

They machine the hole so it is correct again, that's where we think the missing .25mm went. On a normal street engine it wouldn't matter since most M10s don't run that high of compression, but since we're going for 11.5:1 we need it correct.

For example, Ben built this two weeks ago for my buddy Mark while he was out here to put my head together:



That is running 13:1 with a 316 cam so tolerances are important. This is why he needed a new engine

[wertyu78]

JP, did you use plasti gage to measure the tolerance before you installed? What is like to work with?

I need to start assembling the S52 I have at home..

I used plastiguage when we built my motor. Works fine for 24v builds..

[wertyu78]

Yes. It doesn't matter much but since we're going for maximum tolerances it has to be perfect. Ben builds race engines and is anal so we just do what he wants.

They machine the hole so it is correct again, that's where we think the missing .25mm went. On a normal street engine it wouldn't matter since most M10s don't run that high of compression, but since we're going for 11.5:1 we need it correct.

For example, Ben built this two weeks ago for my buddy Mark while he was out here to put my head together:



That is running 13:1 with a 316 cam so tolerances are important. This is why he needed a new engine

[Hermes]

Yup, but it is a racecar...

He was still running the stock 02 oil pump, he has since moved on to the 1.8/M3 pump

Edit: it's Imola

[Hermes]

Finally found the tool

[Hornung418]

So what do you use to install them?

Sent from my Nexus 6

[Hermes]

So what do you use to install them?

Sent from my Nexus 6

I used this:



It's actually a bearing race install tool

[Hornung418]

And a BFH?

[Hermes]

Medium FH

(You can see it in the background)

[Hermes]

Found a late NK single belt crank pulley (cast). I need to dig some more because we think an early one is around here somewhere (stamped)



Edit: my 30# injectors arrived