The more immediate reason for the thread revival is that I'm running into clearance issues with Tial's nimonic/Unicorn horn bolts that hold the CHRA onto the turbine housing. They are considerably taller than the standard bolts and interfere with free rotation of the CHRA because they can hit the oil drain flange and the banjo fittings on the coolant lines. I am soliciting opinions on what to do about it.
Here's a pic of standard CHRA bolts on someone else's car. Same banjo fittings I have (lines are from ARTech) and no clearance issues.
Me holding a banjo fitting to show how the height of these Tial bolts is an issue.
This pic shows how the bolt interferes with the drain flange area. The bolts will only interfere with this side of the flange, because it has slightly more meat on it than the other side.
There are two angles at which I can get the banjo fittings on with the Tial bolts in place. Both leave the CHRA within 20 degrees of horizontal as recommended by Garrett. The laser line shows exactly where horizontal is for illustration purposes.
Position 1 top view:
Position 1 bottom view. To fit the Tial bolt in that hole will require relieving some metal off the CHRA in the area indicated, and also on the drain fitting that will bolt on there.
Position 2 top view. This orientation makes the oil feed line a little tighter and is closer to pushing the 20* limit.
Position 2 bottom view. I won't have to grind the CHRA but would still have to grind the drain fitting slightly.
Anything other than those two positions would require buying new water line fittings that are less bulky than the banjos to clear the Tial bolts. In that case, I could come straight off the two sides of the CHRA with these:
then use these to get the 90* downward and mate up to my -6 lines from ARTech.
This would cost $50-60 for the four fittings through ATP and Earl's. I am 100% sure these fittings are not as bulky as the banjos and about 90% sure that they will fit with the Tial bolts and still allow free rotation of the CHRA and not require me to grind anything. Of course, I won't know for absolutely certain without having them in hand, and having one more connection per side is two more places than can leak.
It seems my options are:
1. Grind stuff a little bit
2. Drop money on new fittings
Do I have any other options, or is there anything I have failed to consider? Not using the fancy Tial bolts isn't an option because standard bolts have been known to back out on track leading to a destroyed turbo.