Boosted LS7 Carnage
TECH Senior Member
Joined: Jul 2009
Posts: 8,032
Likes: 661
Teching In
Joined: Jan 2020
Posts: 1
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Fuel ="4"%2007 C6 Z06 Corvette
Stock bottom end
BTR cam, springs, pushrods, CHE rockers
Kooks long tubes, B&B Bullet exhaust
A&A Super Charger, 8 rib conversion
WCCH CNC ported heads
ACT dual disc clutch
Boost a pump
Pulleys for 9 psi.
12 degrees of timing on the dyno and all hell broke loose!
Cylinders 5 and 7 broke the top ring lands at the 10 o-clock position. Both cylinder walls also cracked blowing coolant everywhere.
Attachment 630659
Attachment 630660
Attachment 630661
Attachment 630662
Stock bottom end
BTR cam, springs, pushrods, CHE rockers
Kooks long tubes, B&B Bullet exhaust
A&A Super Charger, 8 rib conversion
WCCH CNC ported heads
ACT dual disc clutch
Boost a pump
Pulleys for 9 psi.
12 degrees of timing on the dyno and all hell broke loose!
Cylinders 5 and 7 broke the top ring lands at the 10 o-clock position. Both cylinder walls also cracked blowing coolant everywhere.
Attachment 630659
Attachment 630660
Attachment 630661
Attachment 630662
what octane fuel ? And or what spark plugs ?heat range
you can make good power as long as your tune is dead on and you don’t get silly.
5.2s in the 1/8, back in 2009 and still going strong regularly seeing 18-20 PSI.
Granted, this is a forged bottom end 4.130 bore LS7.
TECH Addict
Joined: Dec 2004
Posts: 2,177
Likes: 627
From: Florida
the pistons are light, the rods are light, the block is light...whats to disagree about? Sure some people make them survive but the fact is, the motor was designed to be high/max effort NA therefore its simply not as rugged as the rest of the LS lineup. plus your example is a forged bottom end which is completely irrelevant to this thread and my previous statement.
the pistons are light, the rods are light, the block is light...whats to disagree about? Sure some people make them survive but the fact is, the motor was designed to be high/max effort NA therefore its simply not as rugged as the rest of the LS lineup. plus your example is a forged bottom end which is completely irrelevant to this thread and my previous statement.
Help me understand what you mean.
lets go with rods : what is more rugged? Powdered metal rods or titanium?
Block: Lighter than? What do you mean? Design is pretty much the same except LS7 adds extra webbing and also Billet main caps.
crank: Forged vs cast.
TECH Addict
Joined: Dec 2004
Posts: 2,177
Likes: 627
From: Florida
its a very efficient na motor that simply doesnt hold up as well to heavy horsepower as other ones. its extremely high performance comes at a price, which is ruggedness. how much nitrous or boost do you think a pro stock or nascar motor will take before falling apart? its just a different goal when designing the engine. yes, some live longer than others but those are outliers. Even your own example of an ls7 that survived boost had steel rods and forged pistons.
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9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
ls7 is not as rugged as rest of ls lineup? You call out pistons, rods and block right?
Help me understand what you mean.
lets go with rods : what is more rugged? Powdered metal rods or titanium?
Block: Lighter than? What do you mean? Design is pretty much the same except LS7 adds extra webbing and also Billet main caps.
crank: Forged vs cast.
Help me understand what you mean.
lets go with rods : what is more rugged? Powdered metal rods or titanium?
Block: Lighter than? What do you mean? Design is pretty much the same except LS7 adds extra webbing and also Billet main caps.
crank: Forged vs cast.
Titanium could be good, if it was designed with boost etc in mind. The LS7 rods were not, although they would probably take some boost ok.
But the main weak link is that block.
93 octane and boost on a 11:1 motor? Don't tell me that's what happened. E85 woould have worked but still way too much cylinder pressure for those hyper you crapped it pistons.