VinhZXT Posted October 22, 2001 Share Posted October 22, 2001 Hi all, Just got my turbo motor back from the machine shop... I still need to put all the miscellenuous stuffs back on after painted the block but I don't know whether I should get the metal head gasket for this motor or not. I planned to use the stock EFI system with the T3/T4 hybrid turbo and will be running about 14lbs of boost with 93 or 94 octane gas, intercooler obcourse. Occasionally I would like to go to the track and run a bit higher boost with 105 octane.. The block was redone and so is the head. What type of head gasket should I use? One other thing what is the ideal I/C tubing size should I use for this application? I have an Npr I/C which I will get the shop to make it a little small and while at it I will ask them to weld on the smaller size for the Inlet and outlet. Note I will be using the big throat TB and the N47 intake. Thanks for any input. Vinh http://vvu.tripod.com Quote Link to comment Share on other sites More sharing options...
Guest Tim78zt Posted October 22, 2001 Share Posted October 22, 2001 Hi Vinh! I went with the o-ringed block and stock Nissan turbo headgasket. Tim78zt Quote Link to comment Share on other sites More sharing options...
VinhZXT Posted October 24, 2001 Author Share Posted October 24, 2001 Tim, Can you explain the O-ring process ? I 've read about that somewhere before but forgot all about it. Anyway this shop is charging me too much for the their work.. so I don't think I want to bring it back any more. The head rebuilt from the same place cost me 520. Got the block hot tanked, rehoned, installed new crank bearings and connecting rod bearings and reinstall the pistons and rings (I paid for the rings separately) and the total came close to 600.. How much to o-ring the block? Quote Link to comment Share on other sites More sharing options...
Guest Tim78zt Posted October 24, 2001 Share Posted October 24, 2001 I'm sorry, Vinh, but looking back at the receipts from summer '98 when all this was done to my car too I only found the charges for the head and block-decking. Trouble with this kind of work is not everyone is set up to do it. I'm betting if you call a few race shops one of them will do it for you. Here's how it works as far as I remember: Oh, just so you know, I did not do it myself. This is a specialized process. Precision grooves are cut near the outside edge of each cylinder in the block-to-head surface. The groove depth is measured in thousandths, so it is not very deep. Then a wire resembling piano wire is inserted into the groove. It will be a little taller than the groove. So now you are ready to put your stock Nissan headgasket on. When the head is torqued to the block, hopefully with an ARP head-stud kit, the headgasket will crush into the piano wire, creating a superior seal around each cylinder. What do you think? Clear as mud??!!! Any questions, let me know! Tim78zt Quote Link to comment Share on other sites More sharing options...
VinhZXT Posted October 25, 2001 Author Share Posted October 25, 2001 Thanks Tim.. you didn't say how much did it cost you to O-ring the block.. Vinh Quote Link to comment Share on other sites More sharing options...
Guest Tim78zt Posted October 25, 2001 Share Posted October 25, 2001 That's because it was too long ago and I don't remember and I would have to rely on a receipt I couldn't find, Vinh. So that's why I recommended you just ask a few shops in your area. Their price will be what you pay if you choose to get this done. Like I said, unfortunately this isn't one of those jobs you can elect to do yourself. Sorry again. Tim78zt Quote Link to comment Share on other sites More sharing options...
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