[DMCForum] Re: DMCH performance engine specifications (Rick G)

["content22207" <brobertson@xxxxxxxxxxxx>]

SAE change was made in 1971, I think (about the same time compression
was dropped across the board).

If Houston simply bumps compression up to Euro spec 9.5:1, that alone
yields 15+ NET horses.

I believe their dyno graph shows the red line moved closer to 7,000
RPM, which would indicate some sort of change in the valve train.

Freer flowing exhaust should be worth 5 or 10 HP.

Don't forget: HP calculation depends on engine speed -- all Houston
has to do is figure out a way to get 500 more RPM out of the PRV, and
HP goes up 10% on that basis alone.

BTW: are you including the Prelude engine in your claculations? The
high compression 500 should be ~390 gross HP. That's 390 HP @ ~3,500
RPM (which could almost double if you modified the valve train to spin
even faster). You do realize your 500 is producing more torque at IDLE
than even a turbocharged PRV will ever produce at throttle.

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "twinenginedmc12"
<twinenginedmc12@xxxx> wrote:
> 
> I'm sure the DMCH performance engine is a fine engine, but it should 
> be noted that the power specification they publish does not 
> accurately compare to the stock specification.
> 
> The OEM stock engine was rated 130 hp "NET", by law, which means the 
> reading is taken with all accessories like water pump, alternator, 
> air conditioning, intake, exhaust, etc, connected. 
> 
> The DMCH performance engine is rated 197 hp "BRAKE", meaning the 
> reading is taken with no accessories connected.  There doesn't even 
> have to be coolant in the passages.  In the nineteen seventies, the 
> Society of Automotive Engineers (SAE) abandoned specifying brake 
> horsepower (BHP), because it does not accurately reflect the power 
> available to move the car.  
> 
> Unless Delorean in Houston starts specifying their performance engine 
> in NET horsepower, it's not possible to intelligently compare the two 
> engines.  I consider DMCH specifying their horsepower in BHP either 
> misguided, or somewhat deceptive, depending on their motives, in that 
> it leads people to believe the performance engine is more powerful 
> than it is.  This is precisely why the SAE stopped specifying power 
> this way.
> 
> 
> Rick Gendreau 11472 
> twin engine Delorean, 560 brake horsepower, 450 net horsepower, Gosh, 
> what a fun car.

---

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