2000 ej25 rebuild in progress

[1stgenfarmboy]

before you button it up, think about the rods growing long before the block will with heat expantion, did you give it some extra clearance for heat groth?

if you only buffed it till it misses cold , it could make contact with a little heat.



just a thought before you got to far to check it.

[jeb532]

good thought...and yep, I made sure I had at least .05" clearance on every rod end.

If they grow that much...I have much bigger problems...

[jeb532]

I worked on the inner radius of the exhaust ports just downstream of the seat insert. That nasty little sharp corner with only about a 1/8" radius now has more like a 1/4" radius. Probably could have gone a little farther...but without head to section up I didn't want to push my luck....

[jeb532]

The block is aluminum, rods are 4340 steel. Aluminum expands significantly faster than steel...about 2X faster. The block will expand away from the centerline of the crank faster than the rod ends will expand towards the block.

[1stgenfarmboy]

wasn't thinkin about the block beeing aluminum....... carry on...

[jeb532]

...and drove the rear main seal in too far...dang manual doesn't tell you when to stop...so now I making a seal puller 'cause I am NOT taking stuff apart.

It'll be a good exercise anyway...I had hiatal hernia surgery yesterday so I can't lift anything over 10 lbs.

Laprascopic...the only way to go for surgery..in and out in one day!

[jeb532]

Checked the valve springs today...all are within specs...

Gonna slap together a cam/head and a set of rockers and check the cam profile (Delta 1500 grind).

Made a 3D solid model of the valve train in Pro Engineer...and the rocker arm ratio appears to vary quite a bit as the rocker rotates through its motion. Looks like the exhaust starts out about 1.48:1 and finishes up about 1.57:1. The Intake changes like 1.77:1 to 1.85:1

So I slapping a degree wheel on the cam and a dial indicator on the valve. I post the results...maybe by the weekend...

[jeb532]

short-block.jpg photo by 5322009 | Photobucket

Maybe I'll have it running in a few days...

[cardoc]

That engine is too clean. You need more finger prints.

I am probably not the only one here to be thinking it, but I will suggest that you take and post live video of the start up.

I want to hear it running.

[jeb532]

Originally Posted by cardoc

I am probably not the only one here to be thinking it, but I will suggest that you take and post live video of the start up.

Definately!