L67

[boingk]

I love those video's, very realistic.

Best thing about them is he backs it all up with data and talks through it.

Now fitting all that in a car and getting it tuned would be the big hurdle. Well, that and a driveline to suit. You'd need to upgrade everything from the crank flange back.

 

[Immortality]

LOL, what he does on the dyno would be almost impossible to replicate in a car. For starters they run those engines really cool, then they use the best fuel available so that detonation isn't a factor. Nice simple plumbing on things like intercoolers and exhaust systems that aren't much more than headers and a straight pipe.

Put all that in a car, with full exhausts including cats and mufflers, tightly packed engine bay with all the fun of making all the intercooler pipe work fit and run the engine at realistic temperatures and full intake systems and the fuel we normally use and it won't make anywhere near the power.

I also question their power correction, in the video they ran the engine n/a and it made 267hp for what is a basically a stock L67 bottom end (low compression) with a cam and head package using a L67 LIM with gutted M90 case and long tube headers. That manifold has no runner length and is all wrong for n/a power and yet it still made 267hp/199kw. What does a stock L67 make?

There is a good reason we don't race dyno's

 

[boingk]

LOL, what he does on the dyno would be almost impossible to replicate in a car. For starters they run those engines really cool, then they use the best fuel available so that detonation isn't a factor.

Yup, thats what I'm alluding to above. You'd have to be a lot more sensitive on the tune - which from memory in this case was E85 anyway so actually a great option for a strip car.

Put all that in a car, with full exhausts including cats and mufflers, tightly packed engine bay with all the fun of making all the intercooler pipe work fit and run the engine at realistic temperatures and full intake systems and the fuel we normally use and it won't make anywhere near the power.

Probably still pretty close to be honest. All the intricacy of exhaust still just has to be large enough to let you run a reasonable pressure differential for the turbo - thats it.

For fuel, yeah fair call, but a flex sensor will let you run a map that adjusts for the ethanol content (or lack thereof) in your tank.

I also question their power correction, in the video they ran the engine n/a and it made 267hp for what is a basically a stock L67 bottom end (low compression) with a cam and head package using a L67 LIM with gutted M90 case and long tube headers.

Well to be fair its jumping from the stock 184/189@50 camshaft to a fairly stout 220/230@50 camshaft - that's a massive leap in intake and exhaust duration and more lift into the equation as well. You'd be expecting around 1.2hp per cubic inch and what do you know it comes out at 1.15hp/ci so not too far off at all. The compression would just mean you'd need a reasonable torque converter for the engine spec, and the intake package, well, short runners usually just rob low-down and midrange power... which is exactly how you'd avoid grenading the conrods.

I agree that the biggest challenge would be getting it near those numbers, reliably, in a street car and on pump fuel. Realistically you're probably looking at a 450hp engine on 98 octane and 550hp+ with E85.