R33Det & R34 Gtt Crankshaft And Engine Block

[zoom]

the block has been decked.

i will take some pics when i'm there at the mechanic sometime in couple days.

I have also attached CP piston SC7305 (mine- 86.5mm 9:1CR) and SC7307 (86mm bore ans 8.5:1CR) specification, the compression height is the same.

SC7305-1.pdf

SC7307.pdf

[KiwiRS4T]

Have you determined the compression height fom the spec sheet or by measuring the actual pistons?

Ask your engine builder if you can solve the problem with a thicker head gasket and if he doesn't know for sure ask an engine builder who knows his RBs.

If the mechanic at your local workshop is building the engine he probably doesn't have enough relevant experience and/or knowledge.

[zoom]

measured the CP piston today and the compression height is exactly the same as my stock piston, about 31.5mm. putting next to each other and the height from the wrist pin to the top of piston is exactly the same.

seem like people are saying the r34 block and crank are the same as r33, if everything are the same, then the machiner took off too much meat from the block (by .8-1mm is crazy).

my tommei head gasket is 1.2mm, i assume that it won't be enough right?

[KiwiRS4T]

Get on the phone to some Gasket makers/suppliers tell them your problem and see what they come up with. You can get thicker gaskets. And FFS find an engine builder who knows how to deal with this.There must be at least one probably more in a place the size of Sydney.