Engine blocks

[szewczyd]

I have been looking in the junk yards in my area an I am actually having a hard time finding a turbo block being the 4g63t. I have found plenty on non trubo blocks wihc are of course 4g63. My plan was to get a turbo block and bore it out and put some nice forged psitions and rods in it. Are the non turbo and turbo blocks identical other than the different compression pistons or no? Are the cranks the same? Are the rods the same? Are all the bolt patterns for everything to be able to put all my turbo stuff on it the same? please help with any info.

 

[92redman]

The 6bolt blocks are identical except for pistons and oil squirters which you don't need. Not sure if the 1g 7bolt N/T has the same rods as the turbo one though.

 

[szewczyd]

What are oil squiters and why wouldn't I need them? thanks for the help

 

[workin_on_it]

you wont NEED oil squirters to a certain extent, but they definately don't hurt. if you plan on making high hp #, and since you are planing on putting forged pistons in, i would recomend it. they squirt oil at the bottom of the pistons which helps cool the higher then normal temps of a turboed piston.
i'm not sure how much hp you could run without them, probably alot, but it will be harder to get rid of knock since your pistons will be hotter then in a turbo.
you could look into getting them put in at a machine sop, but it may be more work than it is worth.
when i do my turbo build up, i am going to make sure i get a turbo block.

 

[92redman]

I was under the impression that with forged internals the oil squirters don't do much at all. I've heard that some people even take the squirters out because they can get clogged and cause more problems then they prevent. As long as the oil pump is good and your getting oil to the pistons, they should keep themselves plenty cool enough.

 

[greathuskie]

wont it be hard to clog an oil squirter thats got 80+ psi behind it?

 

[92redman]

A read about a few engines that had them clogged in 2g's and some thought that could have been a cause of crankwalk, but that is unlikely and not proven. But they can clog. And there shouldn't be 80 psi for oil pressure, it should be like 12 at idle and around 30 to 40 or so at high RPM's. I think you were confusing psi with kilo pascals cause specs are 80kPa at idle.

 

[Rick@AP]

Oil squirters are nice to have but are not needed when using forged pistons. Forged pistons have a much easier time dissapating heat than the stock pistons. Piston manufactures usually don't take squirters into account when forging pistons. Also, you don't have to worry about squirter and piston interference when building a stroker. 90% of the blocks that I build are with NT 4g63 blocks because they don't have oil squirters that can clog and because I can get them for as little as $30 because most people think its junk because its not a turbo block (thanks to all those guys I've bought blocks from).

BTW, if you have the BS removed you can see pressure as high as 100psi.

 

[lowavenger96]

I thought the factory turbo pistions were forged .....

 

[PropXprt]

Be sure you get the original main caps with the block you are getting. I did not know this and ended up having to trash an otherwise good block...good luck in your search.