timslib

Hey Benny, 

Some updated data came in regarding piston rings - the NA gap is much too tight. Especially once you factor in heat and expansion, given the cast alloy pistons and the iron sleeves, your gap will tighten which will create a sub-optimal environment for boost. I've been told that the ideal gap for a stock motor seeing boost is around the upper limit of the stock spec, if not slightly more... remembering that this motor is 10.7:1 CR whereas our EJ turbo friends are somewhere around 8.2, we're dealing with an engine that's compressing already compressed air 2 times more than the smaller engines are... however, these engines still don't seem to suffer the ringland failures, insofar as the conrod becoming 2-or-more piece and adding a viewing window to the crankcase. 

https://www.cp-carri...19final-web.pdf

Some useful info in there as well. Also, if you're going to boost a stock block EZ, I would say E85 as a minimum unless you really really trust your tuner. 

Unfortunately, cams still seem to be thin on the ground. Aaron Gipp has been making them but no updates on those as yet. I've sent an inquiry to Starcev Motorsports in Russia but that comes with it's own complications as is, because importing from RU is problematic at the moment. 

Beyond that, any other questions, sing out and I'll try to answer it. 

G'day gents, 

Good to see the ol' four-rums has returned. Not had a lot of time to tinker around, unfortunately I'm still pending a shed at the new joint. Dug the foundations though, so we're not terribly far off! Benny - I will be due to collect my junk soon hopefully, sorry for the hold-up! 

I've started the process with RSS to get the case halves done... that will be the first big hurdle. I think I might get a local machine shop to do a hone with the pistons before I send them off for drilling and close decking just in case, don't want to be out of pocket for freight and time if the bores are too oversized! 

For the meantime, must update some of my old data. 

Hey boys, 

Unrelated to the timing chain, a con rod decided to go boom. I can attribute that to me being a spastic, I was driving the car on a tune I was doing as I went, and gave it a bootfull. I think the bottom end on that motor wasn't all that healthy anyway. 

I've got the last of the parts needed for the built motor. So, I think I should get that done. Unfortunately, I've been flip-flopping between what I should do, which hasn't been great. Stock motor NA, throw another stock motor at it, or just build the freaking thing already. 

I think we'll just build it. Benny has a spare motor for parts for me in Ararat so I think a drive up is due soon...

Wicked work! Been keen to get back on and do some updates. 

Thanks mate.

Edit: Quickly did an update as I realized that the STi rotor I referenced was the 5x114.3 one and not 5x100. Just to clear up any confusion.