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?

[technicalninja]

What I haven't see yet is "what does the other case side look like?"

Does Raby do the groove on both cases?

I don't know!

The groove is pretty big as is.

If that was the only thing the case needs, I'd do that mod by hand with a triangle file.

There's another "gotcha" out there as well...

Lots of folks have posted about the quality of the current crop of RMS.

Common gripes are "The molds are old, and the seals are less likely to work."

I haven't seen "Use this brand and you'll be OK" yet...

So, if I was trying to make a RMS work in a T4 today I'd be looking for NOS old shit.

You've already seen one super nice thing about SH...

I posted the video, but he posted "best time to look" is 11:55.

He can be far more precise than me about exactly what to look at.

Saves TIME!

Now the whole video is worth watching a few times.

When I went back and checked 11:55 I saw something I missed the first time around.

I have late cases and the video states late cases need bigger groves!!!

Not sure how I missed that but thanks @Superhawk996
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I'm also in agreement about the need to have the RMS seal. It's SO messy and requires a full-on clutch job to do.

I'll go to great lengths to miss that opportunity for "Practice bleeding".

"Practice bleeding" is any job you get to do twice because you were a moron the first time around!

I've done it far too often...