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?)

[cgnj]

I built my motor in around y2k. The choices were VW or Buick rod journals, VW length rods.

I find it hard to believe that you have standard size main bearing journals on your crank. A German crank would typically be the first oversize. Is it Chinese? I would be running that over to the machine shop to be measured and magnafluxed. I just paid about $100 for that service.

I saw a video of the process that EMS uses to check line bore. They check with the cam in a cam installed. I assume it would be the same to check the main bearings

Get you case decked. If you find someone on the East Coats without an 8 week backlog, please share.

1163/86b with duals. The springs will have to be checked for coil bind. Typically, they will have to relieve the bosses so you can fit dual springs and cut a small relief so you can get the lift without coil bind.

If you have Cr moly h beam rods, 3/8 bolts may clear the cam lobes, otherwise you will be relieving the end caps and shortening the bolts.

If you are running a Shadek oil pump measure the bore. It is typically undersized. CB performance pump is right in the middle of the spec.

I ran my motor for a while with HEs and a Triad exhaust. You will need headers.

Buy stroker pushrod tubes. I ran stock with spacers. I always had weeping.

Don't buy cylinder shims till your heads are done. I used JE pistons. They stuck out of my Jugs. Plus my chamber volume was only 54cc's so it to a while to get that sorted.

Balance everything.


Good luck