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 Post subject: GT crankshaft questions
PostPosted: Fri Dec 26, 2014 2:33 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
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.

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97 Geo Metro LSI,1.3L-GT-DOHC-16v,4.10 5-speed,A/C,170,000,suspension lowered 1",4 wheel disk brakes,15"alloy wheels with 185/50-15 Toyo's,GT bucket seats,analog oil pressure gauge,cruise control, new paint job. 40 mpg at 65 mph.
Good, fast, cheap. You only get two.


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PostPosted: Sat Dec 27, 2014 12:34 pm 
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Joined: Thu Jul 20, 2006 7:17 pm
Posts: 1396
Location: Alberta, Canada
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...

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1995 Swift w/16V 4.39s, 3tech cam, Esteem t-body, Header, needs more.
1995 Gt Mustang "Boss Shinoda" package.
1999 F150 4x4 Supercharged
1967 Mustang 428 auto, never ending expensive project
1993 Civic si h22a, fell in my lap, couldn't resist!


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PostPosted: Sat Dec 27, 2014 1:58 pm 
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Joined: Wed Jan 07, 2004 10:52 pm
Posts: 203
Location: Qc Canada
these holes are plugged from the factory


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