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horse power

38377k5 said:
I'm not calling out anyone in particular in this thread but you'll notice that all of the "guesses" are nice round numbers or numbers that came from a computer program. No dyno numbers to back them up. People have a tendency to grossly overestimate power numbers.

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Dyno's are like truth serum....whaddaya mean its only 400....I was told it was 500!:eek1:

And I include myself in this also....my Dyno 2000 program is good for comparison of parts vs parts....thats how I picked the parts for my BB, and relying on the experience of experts in the field. It is kinda vague on too many things though to think it will be "spot on" acurate. I'll be lucky to get 200 tq at the wheels:crazy:
 
Merv said:
I'm gonna be realistic. But most of the time take what ever numbers someone says and take around a 100 off each number. Unless there is a dyno sheet. When someone says all the parts that should be good for this or that, or the "feel " in the seat etc. Isn't a very good way to measure anything.
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Take 100 off my 6.2 and I have serious issues......
 
my earlier post stating 400hp was w/the zz4 cam swap...its rated
355 HP @ 5250 RPM
405 ft/lbs TQ @ 3500 RPM

so 400hp was off by 50hp or so...but 1 thing is for sure its a good stout engine for $2k or less, depending on what you have to pay for the engine, you can't build a motor that puts those kinds of #'s down any cheaper
 
blazin_blazer said:
my earlier post stating 400hp was w/the zz4 cam swap...its rated
355 HP @ 5250 RPM
405 ft/lbs TQ @ 3500 RPM

so 400hp was off by 50hp or so...but 1 thing is for sure its a good stout engine for $2k or less, depending on what you have to pay for the engine, you can't build a motor that puts those kinds of #'s down any cheaper
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You are correct about not being able to get those numbers cheaper BUT look where the numbers are at...torque is at 3500 RPM which is way too high for a wheeler rig or a tow rig. :deal:
 
i like the low end torque, r u running a RV cam and high rise intake and stuff like that

dang i just seen it was a diesel oops haha
 
i got a 76 k5 blazer running a stock 400CI smallblock V8. According to factory specs i got 175HP idk how much torque i got but ive yanked yotas out of ditches and gone up hills steep enough to point my radiator at the sky. So its all the torque i need :).
 
76zimmer said:
Dyno's are like truth serum....whaddaya mean its only 400....I was told it was 500!:eek1:
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I saw a photo in a hotrodding magazine showing a car show event with a portable chassis dyno set up at the event. People could pay a small fee and put their car on it to find out how much power they REALLY put down to the wheels. The best part was that the owner of the dyno had someone airbrush some lettering on the side of it that was clearly visible in the photo:

"The Dream Crusher"

:haha:



I thought that was great... since I'm willing to bet that nobody has EVER been surprised by making more power than they thought once the car hit the dyno rollers.

:usaflag:
 
i have a 454 and it put down 488hp and 513tq on the dyno. it has a cam that is a little to big for my taste but i run it in the mud all the time so i have no problem keeping it at 5000 rpms in second gear. third gear is a little different story i can only get it to hold 3500rpms in the deep mud. Oh it has 40" cu boggers and 5.13 gears
 
Back in about 1978 or 79, I ran my 1970 SS 396 Chevelle on one of the first few Clayton chassis dyno’s available to the public. It had a large analog horse power display mounted to the wall. It was only capable of measuring about 375 rear wheel HP at that time.

My engine was 460 CI, with 11:1 off the shelf pistons, 318 degree advertised duration cam, Weiand tunnel ram intake, two- 600 CFM Carter AFB carbs, hooker headers, and an Accel HEI ignition.

With this combination I pegged the dyno horse power meter to the max reading, and never did know what my rear wheel horse power was.
 
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