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  #11  
Old 1 Week Ago
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Quote:
Originally Posted by Ferrous Head View Post
The lines don't cross at 5250 if you measure in NM ?

I didn't know that.

I guess different calculations for torque ?
.
5252 RPM for HP, lb-ft

9549 RPM for KW, Nm

That graph of HP, Nm will cross at 7121 RPM.
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  #12  
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needspeed needspeed is offline
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At the RPM that the run was stopped the torque curve was not dropping much. Maybe a couple more HP could have been had if it was revved a little higher. But why would you want that? Bragging rights maybe?
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Quote:
Originally Posted by Ferrous Head View Post
The lines don't cross at 5250 if you measure in NM ?

I didn't know that.

I guess different calculations for torque ?

Also, I think HD claimed 65 horses for them back then. Always thought they fudged a bit.
SAE horse power are measured at the crank with no ancillaries i.e. Genny, oil pump, and gearbox not couple up. This is why my 1993 Duc 900ss producing 79 DIN HP isn't THAT much slower than my mates Honda Blade kicking out 130 SAE HP!
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  #14  
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Quote:
Originally Posted by Serious Blac View Post
SAE horse power are measured at the crank with no ancillaries i.e. Genny, oil pump, and gearbox not couple up. This is why my 1993 Duc 900ss producing 79 DIN HP isn't THAT much slower than my mates Honda Blade kicking out 130 SAE HP!
Of course !

But I thought they stopped doing that (I cal it fudging) in 1972. Chevrolet did.

And I am old. I forget stuff.

I have to use ft/lb and Hp as my engines don't rev much past 6. Well, they will and they are still building power there but it's dangerous territory for thingy's with strokes over 4 inches.
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I like that. That torque curve is fat. Must be lots of fun.
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  #16  
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Quote:
Originally Posted by Ferrous Head View Post
Of course !

But I thought they stopped doing that (I cal it fudging) in 1972. Chevrolet did.

And I am old. I forget stuff.

I have to use ft/lb and Hp as my engines don't rev much past 6. Well, they will and they are still building power there but it's dangerous territory for thingy's with strokes over 4 inches.

Gross HP is what the automotive OEM’s used 1972 and earlier. The Engine is tested without accessories, a dyno air intake funnel and open exhaust.

SAE net HP, 1973 and later where the engine HP is as installed in the vehicle with accessories, full intake and exhaust.

Then there is Rear wheel HP ...

There are also correction factor groups. J607 or J1394
and
for metric ISO 1585

Each of these will show a different number.

There are also lots of ways to skew dyno results either by accident or on purpose.

I’m not 100% , but I though an ironhead 1000 made 55HP at the flywheel.
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Ah ! I see.

Standards.

We like them so much we have millions of them to choose from.

Did you get an A/F graph ?

Those lines look pretty good and I'm guessing the A/F ratio is running pretty flat as well.
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The A/F is so flat Ferrous, you didnt even see it on the bottom of the graph!

Thats a good runner.
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Oh wow !

No, your right, I missed that.

So. the meter is broken. Couldn't get a ripple out of it. Check the wiring. maybe the lead is broken. Needle stuck ? Software glitch ? Interference from your ignition system ? Too close to a power sub-station ?

So. Where is the hidden EFI module ?

(I gotta get one of them for my race bike !)
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I'll tell you what, that is one good running Ironhead. I've seen people do a lot more to their Ironheads and not get a result as good as that one. And the result was taken on a Dynojet, with SAE correction, and the CF is only .98. No tom-foolery, that's the real deal. Beautiful bike, too.
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