Originally posted by Jwest
What is the maximum diameter the the turbine exhaust wastegate hole can be ported out to when using a Terry Houston 3" downpipe? If I remember right, the TH wastergate puck is 1.375" in diameter. Is this correct? Would a 1-1/4" diameter wastegate hole be too large?
Why I'm asking is that I'm looking at buying a newly rebuilt John Craig TE-60 turbo that has the wastegate hole ported to 1-1/4" in diameter.
Thanks,
James West
Omaha, NE.
James,
I would think that 1/8" (.125) seal all away around the wastegate hole would be OK. But???????????? How are you going to determine if the Hole Location is going to be exactly lined up with your specific THDP Puck??
I personally remember when PTE HP Turbo Turbine Housings WG holes were enlarged to 1.125 or 1.250 for aftermarket DP's.
Problem calls started rolling in about slow spooling, which later was identified as WG Pucks not sealing over the holes because ATR, TH, BGC, M...SE, etc. varied in actual puck location and tolerance. Just to verify I had ATR, & TH send me their flange with
puck installed to use as template, and there was a definite difference in their locations.
To try and solve issues we started asking what DP the customer was using, and used the appropriate template. This resolved issues for those customers, but would cause a problem if that turbo was later sold by the customer to someone else with a different DP. I also remember a poor guy that bought a used hp turbo from someone and used the stock elbow/puck I guess you know what happen?? yep the puck was to small and got stuck in the hole... ouch!!
PTE no longer opens up the WG holes to the maximum size of the pucks out there for the reasons stated above. PTE or any other turbo mfr. should not have to chase the location of DP suppliers, it should be the responsiblity of the DP suppliers to maintain there puck location centerline to the turbo's.
Also remember that the holes in the DP Flanges are larger than the Bolts, and that in itself can allow slight rotation of the pipe, hence.. puck alignment to the hole.
I personnally would rather have the hole size approx. 1.00" and determine my actual puck engagement or carbon track. Then I would enlarge the hole using the appropriate centerline.
Believe me there are lots of TR owners out there experiencing slow spool that may be blaming it on chips, converters, turbo etc etc......when its really puck seal.