6.2 L86 vs 2018 Corvette engine

[SRT8dan]

First of all, the L86 IS an LT1!!!  Secondly, I used the Vette engine only to make a point, which your dyno graph also bears out.  On your chart, torque peaks at 4100 rpm's and then starts to drop.  But wait, the horsepower continues to climb, which is the point.  The L86 is incapable of reaching the Vette redline of 6600.  Ever wonder how Ferrari engines make so much horsepower and yet have relatively (note "relatively") low torque numbers?  Because those engines, like the Ferrari 458 speciale 4.5 liter V-8 makes 510ft lbs of torque at 6250 and 600 hp at 9000 rpm's.  I mentioned that horsepower is a mathematical derivative of torque x rpm's divided by 5252.  Move the torque curve up in the rpm range and even more HP is created.  Sure torque drops off at some point, but HP continues to climb until the torque drop off is so dramatic, the engine runs out of steam.  It all revolves around engine design and what it  is intended to do.  Years ago when Chev brought out their big blocks, the high performance engines had little low end grunt because torque was created in the higher rpm range.  They all were the same size engines, just different heads, intake, cams, etc.

I guess I do not understand what your point is that torque drops of after 4000 rpms and HP at 5800 - 6000.  How then does the LT1 Vette engine (2018) make 460HP?  I believe its torque rating is the same at the L86...460. 

Edited February 24, 2021 by SRT8dan
spelling

[JONBLARC7]

Well as soon as I get my LT2 intake and ZR1 throttle body installed I should have all the bottle necks taken care of.  But no matter what drive train loss and weight is still going to hurt us.  But a cammed L86 isn't something to sleep on.

[truckguy82]

On 2/22/2021 at 11:34 PM, SRT8dan said:

First of all, the L86 IS an LT1!!!  Secondly, I used the Vette engine only to make a point, which your dyno graph also bears out.  On your chart, torque peaks at 4100 rpm's and then starts to drop.  But wait, the horsepower continues to climb, which is the point.  The L86 is incapable of reaching the Vette redline of 6600.  Ever wonder how Ferrari engines make so much horsepower and yet have relatively (note "relatively") low torque numbers?  Because those engines, like the Ferrari 458 speciale 4.5 liter V-8 makes 510ft lbs of torque at 6250 and 600 hp at 9000 rpm's.  I mentioned that horsepower is a mathematical derivative of torque x rpm's divided by 5252.  Move the torque curve up in the rpm range and even more HP is created.  Sure torque drops off at some point, but HP continues to climb until the torque drop off is so dramatic, the engine runs out of steam.  It all revolves around engine design and what it  is intended to do.  Years ago when Chev brought out their big blocks, the high performance engines had little low end grunt because torque was created in the higher rpm range.  They all were the same size engines, just different heads, intake, cams, etc.

I guess I do not understand what your point is that torque drops of after 4000 rpms and HP at 5800 - 6000.  How then does the LT1 Vette engine (2018) make 460HP?  I believe its torque rating is the same at the L86...460. 

you said the l86 can make the same power as the lt1 if you just rev it out. That is not true, that is my point. 

You don’t need to explain hp and torque to me. The l86 is not making any more hp if you rev it. 

 

they are the same long block, after that they are different, they are not the same engine fully dressed. The intake manifold and exhaust manifold are parts of the engine. That’s why they have different names and hp ratings. The exhaust path and intake path is where the lt1 gets it’s power bump.

 

This is all stuff that has been discussed hundreds of times since 2014.

 

its likely the c7 exhaust and airbox that make the 40hp. L86 intake seems solid.

 

 

 

Edited February 24, 2021 by truckguy82