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?)

[914sgofast2]

I would suggest you read the post named "Cheap, Junk rebuild" over on the Samba.com in the 411/412 forum or over on the Type4Forum websites, if you haven't done so already. He goes through the entire rebuild on a budget process in great detail and tells you where to save money and where to spend money when rebuilding a Type 4 engine. He has an excellent tutorial on how to properly clean your engine case with commonly available soaps and degreasing agents, as well as how to clean all the oil galleries and install new oil gallery plugs. It sounds like you are building a high performance engine and you need to do the best job you can. I just saw on the "4th Dimension Type 4 Porsche/VW Performance" Facebook page for high performance Type 4 engines that Jake Raby is going to be giving several classes online on how to build a high performance Type 4 engine using his tips and tricks at a very affordable price next year.