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440 Dyno Test Results in Only 335 Horsepower.

Pistons down .150 in the bores, 8.2 compression. 516 heads with the bigger valves installed
and some sort of "mild" cam. 340hp is about right, sounds like.
 
I would be happy with 335 HP from a '72? It just got worse from there?
 
IIRC the 72 was fated at about 270 ponies NET so 335 on the dyno would be about right.
 
davek said:
Its for bragging rights and to make sure it wont blow up the first time you jump on it.
Click to expand...
Nick typically uses it for "quality checking" his rebuilds (looking for issues on the stand versus installed in the car),
for tuning carbs/ignitions and - if the customer pays for it, seeing what the output of a given engine is.
 
I can see the reasons for doing it, just not for watching it.
 
Same basic set up I am running in my 67.
Plenty of torque to smoke the tires,
It will run a decent top end if needed.
It lives just fine on 87 octane with 0 alky.

I keep thinking about buying pistons but then why ? Just so I can grab a few more hp and use 93 ?
Just cruising around. :drinks:
 
It’s similar to putting a combo together for the car, with a specific ET target in mind.
Without going to the track you don’t know if your combo meets expectations or not.

For me, the dyno results are a similar thing.
Most times there is a power expectation for the build.
In addition to being able to break it in under controlled conditions, check for leaks, seat the rings properly, etc........ you also get to see if the combo of parts you selected meets the target power output....... or not.

I have done many many dyno tests where the dyno test was the focal point of what ended up being a great motorhead social occasion.

I’ve had a lot of great days at the dyno.
 
PRHeads said:
It’s similar to putting a combo together for the car, with a specific ET target in mind.
Without going to the track you don’t know if your combo meets expectations or not.

For me, the dyno results are a similar thing.
Most times there is a power expectation for the build.
In addition to being able to break it in under controlled conditions, check for leaks, seat the rings properly, etc........ you also get to see if the combo of parts you selected meets the target power output....... or not.

I have done many many dyno tests where the dyno test was the focal point of what ended up being a great motorhead social occasion.

I’ve had a lot of great days at the dyno.
Click to expand...
We've had a bunch of fun days at the dyno. The sounds and the smells of actually being there are something. Talking with and listening to the crowds watching. Says one guy, "Wait that can't be right! The car with one carburetor made more horsepower than the the one with two carburetors!"

Chassis dyno days are great fun. I'm thinkin' of the time my son and I were standing next to a Chevy on a chassis dyno at SEMA in Las Vegas when the engine blew and showered us with antifreeze. Glad we were far enough away it cooled down some before it got to us.

Springfield, MO and a 427 small block was pushing 1,600 HP to the rear wheels.

And the day at Comp Cams dyno when we heard a big "whump" from an engine at 6,000+ rpm and then you could see the cam and lifters through the exhaust port!

Great fun!
 
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