2270 Build thread, Looking forward to making all of the mistakes! Options

[vjb206]

Hey folks! I've got...

• Case halves from an old 1.7 (cleaned as best I could)
• 2270 crank + P&C kit
• #163/86b Web Cam
• 2.0 heads with 44X36 valves, where I'll be installing dual springs and 38mm exhaust valves
• Upgraded oil pump and other goodies

So my first question for the community has to do with ensuring the rotating mass is spinning freely/correctly…

I started by measuring all of the the main journals on the crank and I got a range from 2.358” - 2.360” (I used a digital caliper and I'm pretty sure I did this correctly).

Then I “dry-fit” Silverline STD/STD main bearings into the case (sans crank), torqued everything down, and got 0.003” in radial play (I used a cylinder bore dial gauge for the first time, and I think I did it correctly).

The spec-sheet says radial play should be between 0.06” - 0.10” (0.03” - 0.09” for #2); and I have 0.003." I'm a MINIMUM of 0.057" off, is that normal? What's my next step?

1. Stop pretending I know what I'm doing and take it to a machinist for test-fitting and honing (I'd like to keep cost down so this is my less preferred option)
2. DIY: hone 0.06" off all bearings (what's the right honing tool / approach here?)
3. Order different bearings (if so, which?)

[technicalninja]

Ah - the link to the Samba T4 pump rebuild is as in my thread. The author does a great job documenting a T4 pump rebuild.

https://www.thesamba.com/vw/forum/viewtopic.php?t=699156

I have a mill and would use a single point carbide drill capable of easily drilling the case hardened idler shaft so I would pin it a little differently but the method outlined here is perfectly plausible for those with only a drill press.

I didn’t touch on it in my thread but the main problem with larger gears like 30mm is that too much pressure will cause the oil cooler to bypass. This in turn creates overheating.
Doesn't the Tangerine valve fix this issue?
That was the "oh wow, valve is a must" moment for me.

If running an auxiliary cooler with long hose lengths to the front of the car and back plus restriction of a an external thermostat - the 30mm pump would be fine.
How about T-stat and short lines to a Setrab back by the transmission?