Tear Down and Reassemble Unstarted 1.7 built to 2270, 1.7 to 2270 Unstarted 10 Year Old Build Options

[Robroe]

Moved from topic of first start of 10 year old build to tear down, inspect and reassemble. The 10 year old build is from a 73 1.7 to a 2270. Stroked to 78 mm and 96 mm cylinder diameter. Heads are Ham/RAT with 36 mm exhaust and 44 mm intake. Both are nicely ported.

Have torn it down to the case and checking crank end play before I split the case and pull the cam and crank. So far, everything is new and looks in good order. I'm concerned about oil passages being blocked with old assembly lube so a complete tear down and reassemble is happening. Discovered stacked cylinder spacers (4) totaling .150". So looking to replace those with single spacers. So far I can only find .160" spacers from type 4 store and may just use them as impact on compression appears minimal. Was shocked to discover crank end play is .450"! Sure glad I didn't try to start this thing. Will check again in the morning to make sure I'm checking it correctly, but I'm doing the same thing on the videos such as Ian Carrs YouTube engine builds so pretty sure I'm checking it correctly. Now to figure out what to do about that huge end play.

Any thoughts about what to watch out for?

[Jack Standz]

From pictures I’m don’t think I see the Raby Rear Main Seal drain back modification . I’d do that while case is split.

Can you point me to Rabys Rear Main Seal drain back modification? Tried searching but haven’t found anything except reference to it, not what it is or how to do it. Thanks!

Yes, I was thinking about this question and came back to ask. But you beat me to it.

Some of us are visual people. Anyone have a photo of this modification they could share? Maybe with some measurements too? The video isn't easy to see things. Maybe a better screen would help, but a few good photos are better.

I looked at Bob Burton's friend's rebuild. But, it seems his was built before this modification was being used at RAT. We have a motor we're planning & rather than take a guess at how to make this modification, it'd be really helpful to see how others have done it.

On a related point, does anyone have photos of a roller cammed Type IV? We have Type 1 tool steel lifters that we plan to use with modified lifter bores on the next motor build. However, the roller cam has benefits over solid cams. Any help with getting a roller lifter/cam setup that you could share would really help the 914 community.

Thx