DEUTZ 912 CYLINDERS

MRRAGPICKER · Post by **MRRAGPICKER** » Tue Mar 03, 2009 4:52 am

I have aquired these

They have some surface rust but looks like it can be taking out when turned for new chevy pistons. They are for my next engine or the next.
Not sure if I want to attempt to turbo these big boys or go with 90 or 91mm's and long stroke.

Passatman · Post by **Passatman** » Tue Mar 03, 2009 6:07 pm

Where did you get these from.

MRRAGPICKER · Post by **MRRAGPICKER** » Tue Mar 03, 2009 6:11 pm

From a farmer in Wisconsin.

Passatman · Post by **Passatman** » Tue Mar 03, 2009 7:43 pm

If i am not mistaken these liners are the ones discussed sometime ago that was said to be the ones of choice to use on a type4 engine.

dstar · Post by **dstar** » Wed Mar 04, 2009 11:33 am

As long as you have a lathe to turn them down!

Don

MRRAGPICKER · Post by **MRRAGPICKER** » Wed Mar 04, 2009 11:56 am

My main problem now is what length to cut them to? The combination of Chevy piston pin height + which rod + which crank choices can be staggering. Since I can make them whatever length I want (within reason) I'd like to make a good choice. I'm under the impression that they can be slightly longer that stock ones and I'll just need to get longer pushrod tubes and head stud bolts. Anyone have any combinations they've been wanting to do that wouldn't be to radical?

Unkl Ian · Post by **Unkl Ian** » Wed Mar 04, 2009 5:13 pm

Figure out what deck height you need, based on stroke,
rod length, quench clearance, and compression height on the pistons.

dstar5000 · Post by **dstar5000** » Thu Mar 05, 2009 1:07 am

....then make them too long, you can go back and turn them again,
to make them shorter but you can't make them longer once they are cut!

Don

MRRAGPICKER · Post by **MRRAGPICKER** » Thu Mar 05, 2009 5:17 am

You got that right Don, I'll probably cut them a inch too long to start. (then find out that they're really 1/2" too long). I'm going to open them up about 1mm, but they are thick at the top head flange. The walls are 10mm thick at the top. I'll need to turn down the O.D. Would a wall thickness of 7mm be a good stopping point?

Post by **Piledriver** » Thu Mar 05, 2009 9:01 am

MRRAGPICKER wrote:You got that right Don, I'll probably cut them a inch too long to start. (then find out that they're really 1/2" too long). I'm going to open them up about 1mm, but they are thick at the top head flange. The walls are 10mm thick at the top. I'll need to turn down the O.D. Would a wall thickness of 7mm be a good stopping point?

Cool

These are the 100mm bores that fit the T4 stud layout?

The upper OD is pretty much "set" due to the holes in the head for the studs--- The typical 103-105mm jugs head register is 115mm nominal OD/ 114.82---4.5205" measured off the $150 QSC alloys I picked up.

The lilkely main thing limiting bore will be the thickness of the skirt end... Get them bored before you turn them down, even cast iron is elastic, you'll get a truer bore on a thick jug.

You have to go quite a ways before you need aftermarket studs, stockers will usually allow at least 10mm/side, usually more.

MRRAGPICKER · Post by **MRRAGPICKER** » Thu Mar 05, 2009 10:06 am

Hey Pile, I was the next highest bidder on those QSC's.
What is the OD of those where they go into the case? Also how long is the skirt into the case?
Yeah they're 100mm. I'll post a pic tomorrow that shows the bolt holes.

Post by **Piledriver** » Thu Mar 05, 2009 10:49 am

103 jug dimensions for fitting...
Measured with a handy pair of Starret calipers off QSC alloys, which may or may not be a great "reference"

Head OD: 4.5205.
Case OD: 4.270"
depth in case: 1.355"
flange-to-flange: 3.425
Depth in head: .260"

MRRAGPICKER · Post by **MRRAGPICKER** » Fri Mar 06, 2009 5:20 am

here are some pics
The first one is a 90mm 1700 914 cylinder on top of one of the Deutz, to show bolt hole location. I could only get a shot of one hole at a time. All the holes are lined up just like the one that you can see in the pic.

Passatman · Post by **Passatman** » Fri Mar 06, 2009 5:31 am

Jesus these liners are thick.

Post by **Piledriver** » Fri Mar 06, 2009 6:43 am

I have a question that the camera cannot easily image, but you can easily see:

Does the cylinder wall thickness neck down anywhere in the finned area, or is it ~ 120mm OD all the way to the base flange?

If so, these would make awesome turbo jugs... and may be able to be bored to 107mm.

The finned area and head stub is basically longer than a stcok T4 jug.