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What if the rod was .236" shorter and the wrist pin was .0787" larger dia and .03937" thicker and the crank was 12% heavier?
That would probably drop the redline if flat plane, but they could still build a heck of a crossplane. Move the wristpin down, strengthen the piston and shorten the rod, keep the stroke, could still spin it well over 7000 in crossplane config with a little less primary than the LT6. The 12% heavier crank is still ~18% lighter than an LT2. Ti rods? The LT6 crank main journal bores are around 3mm larger in diameter versus the LT2 so they have provided for strength there. The 3-valve tuned intake will be gone, replaced by intercoolers so why not. Everything is better with boost.
M178 LS2achieves 537 kW (730 hp) at 6700-6900 rpm and delivers a maximum torque of 800 Nm at 2000-6000 rpm. Max rpm is 7200.
The article is IMO) worth the read on the emgine part
Very impressive for a 4L engine, the quoted power is actually 720 hp and 590 lbs-ft to compare to US numbers. For comparison, the C7 ZR1 LT5 makes 755 hp and 715 lbs-ft.
Very impressive for a 4L engine, the quoted power is actually 720 hp and 590 lbs-ft to compare to US numbers. For comparison, the C7 ZR1 LT5 makes 755 hp and 715 lbs-ft.
I believe from their 2017 North American Engine plan, GMs original target is 850 HP and 720 lb/ft of torque.
The 4.0 MB engine is disadvantaged, in a way, compared to the LT6 dimensions; 720hp at a relatively low 6700rpm, but it has a very small bore with undoubtedly lower cylinder head port flow numbers on the small bore, and it uses 24+ pounds of boost to force the air in.
How much power do you think a boosted 4.1 bore, 7000+rpm LT-6-derived platform would be capable of?
The 4.0 MB engine is disadvantaged, in a way, compared to the LT6 dimensions; 720hp at a relatively low 6700rpm, but it has a very small bore with undoubtedly lower cylinder head port flow numbers on the small bore, and it uses 24+ pounds of boost to force the air in.
How much power do you think a boosted 4.1 bore, 7000+rpm LT-6-derived platform would be capable of?
850 HP and 720 lb/ft of torque. Possibly as much as 906 HP.
850 HP and 720 lb/ft of torque. Possibly as much as 906 HP.
Ha.... these are basically the numbers I was told... car will make mid 800s and then have a "track overboost" feature with water injection for up to 20 minutes allowing it to run over 900.
A smaller displacement motor will weigh less so to help offset the additional weight of turbos. We all know the c8 needs to lose weight, not gain more.
A smaller displacement motor will weigh less so to help offset the additional weight of turbos. We all know the c8 needs to lose weight, not gain more.
That's not how it works... it will be the same Gen6 motor with different bore/stroke combo. The internal displacement will be less. It won't be a new "smaller" motor.
The tool the builder uses to hold the crank in place is labeled LT6 / LT7. It stands to reason the crank main journals at a minimum will be common between both engines.
That's not how it works... it will be the same Gen6 motor with different bore/stroke combo. The internal displacement will be less. It won't be a new "smaller" motor.
I agree the "smaller" engine would not weigh less.
I believe the displacement will stay at 5.5L for the LT7. If not, count me out as a potential buyer.
Unfortunately, the ZR1 will gain weight over the Z06, hopefully marginally.
Why does everyone keep going on about a CPC version of this thing? Everything about it is engineered around dealing with the vibration characteristics of the FPC. You can't just drop a different crank in there and call it good.
If they do a DOHC V8 it's going to be very different from this motor.
I agree the "smaller" engine would not weigh less.
I believe the displacement will stay at 5.5L for the LT7. If not, count me out as a potential buyer.
Unfortunately, the ZR1 will gain weight over the Z06, hopefully marginally.
I’ve been saying it for awhile, I still don’t believe they designed the modular Bedford 6 frame on accident. At the ZR1 price point, perhaps they’ll splurge on light weighting materials for some of those components as well as others to offset some of the additional weight due to the FI engine and perhaps beefier components to deal with the added power.
11-07-2022, 12:10 PM
