GT crankshaft questions
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Author:  fainya [ Fri Dec 26, 2014 2:33 am ]
Post subject:  GT crankshaft questions

I got a GT short block while I was in California.
Got the short block home and started looking at the differences between a 1.3L 8 valve and a 1.3L 16 valve GT engine.
GT rod are thicker and free float.
GT crankshaft is Forged not cast and cross drilled oil holes.
Main bearing caps have a girdle across the caps to stiffen them.
1st question is: when suzuki cross drilled the forged crankshaft (the hole that goes from the main journal to the rod journal) on
this crankshaft they left the end of the hole opened (unsealed). With the engine running these hole will be spraying oil everywhere. This has got to be the reason that the 1.3L has low oil pressure at hot idle.
2nd question: What is your thought about plugging these drill holes off? Or tap them and then screw in an orfice so the crank still sprays oil everywhere, with the orfice controlling how much oil is sprayed.

Author:  codyb76 [ Sat Dec 27, 2014 12:34 pm ]
Post subject:  Re: GT crankshaft questions

I've never seen a 1.3L with low oil pressure problem at idle. The gt bottom end, exactly as it left the factory is a proven piece that regularly survives for a huge number of miles, even when abused and driven hard. I would consider this before messing with plugging those holes. I'm certain lots of thought and detail went into the design of these engines, crankshafts and all components and design features within the engine. If they suffered from bottom end issues then I would see what could be done to improve them, but since they don't, why change things?
Just my $0.02...

Author:  bostssgt [ Sat Dec 27, 2014 1:58 pm ]
Post subject:  Re: GT crankshaft questions

these holes are plugged from the factory

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