rx7tt95

Found the problem. We assembled the engine minus the internals and pressurized the coolant system. Hole in the rear secondary runner. I'm not a happy camper. Next time, leaving the porting to the experts or just ordering a motor from Pineapple. Sealing her up now with epoxy. Seems that the boost would "push" the crack up a bit and allow coolant to enter. It'll seal back up if you don't probe it with a screwdriver...pretty small too. Couldn't feel it at all.



I'll mention the vasoline thing to them. They're using these black reuseable o-rings. Apparently Pineapple uses the same brand. Not sure if they're teflon encased or what. What do you recommend for the outer ring? OEM?

Swervedriver

That sucks! Sorry to hear about it.



I use OEM for the outter, & that should be fine since it's never subjected to combustion gasses. I use Hylomar to keep it in place as well. The only thing I used Vasoline for was all of the friction surfaces. I just used fresh oil on all of the O-rings & seals.



I got the teflon encapsulated silicone from mcmaster.com.

banzaitoyota

McmasterCarr O-rings, Stock outer Seals, Hylomar on ALL seals

rx7tt95

Not sure where they get theirs but they're supposedly the same as what Pineapple uses. Anyway, they've never had a problem with seals expanding due to Vasoline and most people use just that to assemble them. I dunno. I'd definitely prefer Hylomar but I'm second guessing them often at this point. If they had just pressure checked the engine THE FIRST TIME before installing it, we wouldn't be having this discussion and I'd be about $1K richer. Just really sucks. Yes, the porting thing was my fault but each and every engine they build should be checked before being dropped into a car. I personally didn't know any better. But that's why I pay them to install it, right?



I managed to get three layers of ResinLab epoxy on both secondary ports (just in case). I did a majority of the coating on the coolant passage side. Let each dry w/help from a heat lamp. Once dried, I slapped another layer on. Should hold Hoover Dam quantities of whater

j9fd3s

its be tempted to put a thin layer of epoxy on all of the port runners, just in case



mike

rx7tt95

That's EXACTLY what I did. Both secondaries on the OUTSIDE and the primaries on the inside since it's difficult to get to the back side. I put three layers of epoxy on the secondaries. Let each layer dry, heat lamp assisted, then a new layer. Should deflect bullets now. This epoxy stuff is as solid as a brick wall and makes JB Weld look like playdough. Engine is pretty much assembled and will be in the car on Tuesday. Pressure testing it over the weekend.

Silver Ninety Three

I mis-read your post. Check to make sure the housings aren't warped. A indication of this is the dowel pins being stuckin the housing when you dissasemble the motor. Glad you found the problem. Guess you ported too far.