Mythbuster: continuing project thread of my 1303 '75

[Wally]

Originally Posted by $aint

Haven't seen these Deutz cylinders before. Are they for a type4 or for some other engine and repurposed?

If you want to share I'd be interested to know why you're going with 102mm vs the 98mm you had (or anything else for that matter).
I still have a bunch of these decisions to make as well (2056, 2270, etc)

And 9000 RPM is quiet a bit, do you make that regularly?

Deutz is a tractor manufactorer and is always a diesel engine...The older jugs are better to use, but harder to find and as the word seems to be out about these (old autocrossers used these 25 years ago already..), prices on ebay for used barrels are up. They used to be 'free' (tossed from old broken engines)

With Original head castings I would always keep as small a bore as possible as the heads warp originally already, even more so when fly-cut and even more so when 'openend up' for big bore. Everything you cut away is a weakening...

However, the Original 98mm bore idea had a long history from when friends made a set of custom made alu-'nikasil' cylinders and the were in 98mm, no choice there, but enough for a turbo engine

However again..., with the billet heads I now use, warping is not an issue anymore, but I also want to keep the case openings as small as possible as opening that also weakens the case (spigot). The edges where the cylinders rest are extremely small on engines that run the standard 103mm bore cylinders. I don't like that for a (really) big hp engine.

As one doesn't always have free choice and everything is a bit of a comprimise, I got a very good 'deal' on the cylinders which were 102mm to begin with, so I'll have the bottom turned down a little to minimize wall (2mm) and keep case strength up a bit.
I'd rather had 100mm and keep that 1mm more in the case, but sometimes you also go with what you have and its probably not really that much of an issue and the extra cc's give a bit more bottom torque (spool), so that nice as well.

Long story, but considerations for decisions are never simple nor single

[Wally]

Somehow its been too long since an update! And this great forum can use a little more traffic I think.

The 102mm Deutz cylinders have been machined, new JE pistons with dish have arrived also and new JPM cam is awaiting as well.

I had damaged a Pauter valve adjuster, but Pauter wasn't too keen on sending me a replacement, so I looked online (JEGS) for the 3/8-24 adjuster with solid cup. Crower is the one Pauter used as these was exactly the same
Very relieved I found it and it turned out to be the same one!

The new Nascar Ti valves I bought had a very unusual valve angle, so a new cutter (55 degrees) had to be ordered. We still wait till my shop gets it, so the heads can finally be finished as well.

[Wally]

Alright, back to rebuilding this engine

Mocking up for cam timing:


Crank assembly untouched since emoved and will go right back:


This was the damaged cylinderhead, now all repaired again:


Because of the all steel cylinders and the general high engine bay temps I had with the headers on top, I am also upgrading the oil cooler to a bigger (higher) one and have ordered some Naca ducts for the quarter windows, so cool air can enter from another point in the engine bay.
Work to do!

[effvee]

Yes, more eye candy. Are the cylinders deutz ?