I am making an adapter to fit a CT26 to my 1HZ 79 series farm Ute I have the bolt pattern for the turbo but cant find the dimensions for the bolt centers on the exhaust manifold flange can someone point me in the right direction please
1HZ exhaust flange bolt centers (PCD)
- Thread starter Krankieone
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After much searching I came up with no answer so I ended up getting the venier calipers out and measuring the distance between the bolts and the distance to the outside of the bolts. I calculated the diameter of inside and outside of the bolt circle and came up with 79.5 & 101.5 obviously there is some measurement error there as the bolts are M10 but feel pretty confident that the pitch circle dia would be 90mm I put a bit of polycarbonate sheet on the mill and drilled three 11mm holes on a 90mm PCD and checked that inside and outside diameters fitted in the holes
Curious of a follow-up on this, did your measurements work out to be correct? I'm going to turboing my HZJ79 here pretty soon. I'll be fabricating an adapter plate form the 1HZ factory manifold to a T25 flange. I have a ball bearing GT28 I'm slapping on this sucker. Ideally, if I can get dimensions for it without pulling mine down just for the measurements, that would be great. That way I can get the "kit" fab'd up prior to teardown and do everything in one go. I have a brick of PH 17-4 CRES steel i'm going to take a slice off of to machine this adapter out of. I was just going to pattern it off the manifold gasket till I discovered its just a crush ring that doesn't have the hole pattern in it.