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3L turbo final round

contour2gq said:
I'm just curious was you using 3l heads and was the injectors you was using for a oval port or split port? Cause if you was using split port injectors in a oval port head maybe it's as sicse suggested that the one piston looks like the fuel wasn't atomized. Which is what would happen if using split port injectors In Oval port heads
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Please add the term "were" to your vocabulary.
 
Yup like I said split port has a smaller spray pattern an oval port has a wider patter. So if you are using a svt intake an oval port heads you are still going to need the injectors for oval port or the wider spray pattern injector

bhiggs89 said:
Please add the term "were" to your vocabulary.
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no
 
TRicker said:
coincidence IMO.
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Guess we'll agree to disagree on this one. I just haven't seen many true coincidences in my years of tearing down and rebuilding engines.

TRicker said:
most likely a heat issue making the piston weak
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So we actually agree, you're just ruling out the fuel issue possibility. :cool:

TRicker said:
the piston would be melted or dusted off on the top if it was a lean condition.
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The piston from the first build WAS melted, (in the same spot that this one cracked), and had three discernable hotspots. This one obviously cracked before getting to the point of melting, but it also shows hotspots... at least one of which, would eventually have melted. And hell, after looking at the pics again... it looks like #4 AND #6 were melting in the lower left corner... #6 especially. Am I seeing things?

TRicker said:
the cylinder walls would be scored or something of that sort.
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It looks to me like the walls ARE scored. The failure is not a gross one, so the scoring is appropriately proportionate, but present nonetheless.
 
So just because of a higher pound injector it no longer has a spray pattern? Cause I THOUGHT i read on here on there website to let them know if you're running split or oval?
 
Brokendown said:
Wait, Contour2gq, said you are supposed to use the 3L injectors, even when using an SVT manifold? It makes sense to me but I was told not to use the 3L injectors and use split port injectors when using SVT manifolds...?
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contourgq isnt exactly correct. u use the 3L injectors when u run an oval port. i.e 3L upper, lower, and unmolested heads. on the other hand, u use the 2.5l injectors when running a split port. i.e svt/npg lower & svt upper, and molested/ported head.
 
contour2gq said:
Yup like I said split port has a smaller spray pattern an oval port has a wider patter. So if you are using a svt intake an oval port heads you are still going to need the injectors for oval port or the wider spray pattern injector



no
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Brokendown said:
Hopefully he will come on because I am curious. What he is saying makes sense though because the injector is spraying into an oval port but its off to the side...I don't know...
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u're not listening... his statement omits the fact that the heads will be ported to match the 2.5l intakes. that makes it ok to use the stock 2.5 injectors. i'm running a turbo with 42#s of fuel injecting pressure. spray pattern is irrelevant.
 
I don't know where you get that he omits that they are port matched because he just said if your using an SVT intake with oval port heads...that's port-matched last time I checked. And then he says, you will need to use the one with the widened spray pattern (the 3L injectors). It's not that I am not listening, I am just not understanding.
 
Brokendown said:
I don't know where you get that he omits that they are port matched because he just said if your using an SVT intake with oval port heads...that's port-matched last time I checked. And then he says, you will need to use the one with the widened spray pattern (the 3L injectors). It's not that I am not listening, I am just not understanding.
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ok. he's incorrect. simple. put simply, ovalport-3l injectors. splitport-2.5 injectors or similar spray pattern. can we get back to my build now please? what's the smallest NPT tap size i can use for my turbo oil line feed? i had a 3/8. i cant find that size tap anymore.
 
BAD SVT said:
ok. he's incorrect. simple. put simply, ovalport-3l injectors. splitport-2.5 injectors or similar spray pattern. can we get back to my build now please? what's the smallest NPT tap size i can use for my turbo oil line feed? i had a 3/8. i cant find that size tap anymore.
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A 3/8" NPT tap is huge for a feed. For a drain it would be fine. I'd say it's a 1/8" NPT for the feed.
 
you want to use the injector that match the LIM that is being used. the injectors are located in different location and thus have different spray angles.

the turbo feed is either -3 or -4 AN, I don't recall right now.
 
The #42 greentops have one of the best spray patterns...I doubt the injectors are the issue.

What size fuel feed line are you running? Also are you using a stock return fuel rail? What was the duty cycle on the injectors last dyno? Also what spark plugs and gaps...My TR6's said not to touch the gap but they were anywhere from .032 to .045 when I got them...
 
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BrApple said:
you want to use the injector that match the LIM that is being used. the injectors are located in different location and thus have different spray angles.
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exactly.

2000ZxT said:
The #42 greentops have one of the best spray patterns...I doubt the injectors are the issue.

What size fuel feed line are you running? Also are you using a stock return fuel rail? What was the duty cycle on the injectors last dyno? Also what spark plugs and gaps...My TR6's said not to touch the gap but they were anywhere from .032 to .045 when I got them...
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i dunno what the fuel feed line size is. i can check. the line came with the kit. so did the npg LIM. its been modified to fit on the 3l heads. i dunno what the duty cycle is either. joey @ npg has those figures. he tuned it.
 
for the millionth time....

this wasnt a tuning issue. this wasnt a fuel issue. this is catastrophic engine failure. there are no melted pistons or scored cylinder walls. it is all BROKEN pieces of piston. boost pressure, excessive piston "slap", or a foreign object could have sparked this problem.
 
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