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#1
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440 with 1025nm of torque?dunno why??
hi,had a 440 built and wanted the shop to build a 10.1 comp,pump gas,mild ,legal,(here in Australia).they used 8.75.1 flat tops,milled the heads! used a 509 hyd cam,ported heads,std valve size,torker 2,800dp holley etc...
the car runs sweet,idles great,revs to 6800,and drives with 3.23 ratio great. i have had the car run on 3 different dynos now and all results baffle me.the engine builder kinda aimed for 450hp,450ft lbs of torque.dyno results show about 430hp but 810ft lbs(1025nm)of tque.??the dyno guy said the cam wasnt degreed right....checked it and it is spot on.why do i have the h orsepower of a mild smallblock but the torque of a cummins diesel??? any ideas?wrong combination?it's a bit of a mystery. |
#2
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Thats one of the weirdest readings I ever seen.
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#3
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hey Dusterdave, that is not the horsepower of a "mild" smallblock. it does sound like the cam was degreed in with too much advance. but I don't know with out checking. that much torque would be awesome though!! could pull forever.
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#4
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Can you post the dyno sheets?
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#5
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The HP is about right, the torque is wrong. I'm not sure of your peak torque but you're making about 403 ft lb at 5600 rpm if thats where you're making the 430 hp. Thats an example but it's close to that rpm I'm sure, Paul.
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#6
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Changing the way the cam is degreed will change the balance of HP and torque. That is what your dyno guys are getting at. You probably installed the cam straight up (alignment marks pointing at each other). Now you need to go back and determine cam centerline and then degree the cam for proper balance.
Here are a few resource that give a better explanation - http://www.ridgenet.net/~biesiade/camdegree.htm http://www.iskycams.com/degreeing.php http://www.cranecams.com/?show=article&id=3 http://www.thedirtforum.com/degree.htm http://www.compcams.com/information/tutorials/ |
#7
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10 bucks the dyno is just plain wrong. Bad calibration or instrument or something! I would think those numbers are impossible!
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#8
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Boy even the tractor puller guy's would love the have that much torque.
That is way to far out........No way, No how...... If that's the case...I would love to have all the specs for that one....I'll build a ton of them....:jackbox: |
#9
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A typical NHRA Pro Stock capable of mid six second 1/4 miles makes about 1350 HP and appox a max torque of 800 or so. The only way an almost stock 440 could make 800ft lbs of torque would be to run it on alcohol and supercharge it, Paul.
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#10
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Do the hp and torque numbers cross at 5250 rpm? If not the dyno is lying.
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#11
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He states that 3 different dynos have given him this.
As these are most likely rear wheel dyno's have they properly calculated for rear gear ratio and tire size? |
#12
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Maybe the metric conversion is wrong. 5252 is the point where HP =torque. torque x rpm divided by 5252 = HP
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#13
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The metric conversion is off a little. not by much.
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#14
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thanks for the commments;the engine builder assures cam is degreed right,the dyno has been very similar on three separate attempts at different shops.
the car pulls hard and strong and feels like it would go very damn fast at top end.it has tall 275/60x15 and 3.23 open wheel diff.2500 stall.727. with this combo it ran a 13.0 at 103mph,with huge wheelspin ,shifting at 5000(.she also smoked the entire length with a tire frying 17.6.!) i am sure some gears and lsd will wake this car right up.thats next. I will try to get the dyno sheets scanned in.I realize these figures seem a bit hard to believe ,but,no shit,that is the numbers i keep getting....and i also struggle to fathom or understand them.cheers.merry xmas to all. |
#15
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Digital photo might be easier than scanning...
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#16
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Quote:
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#17
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He's already been to three different dynos...
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#18
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i'm not complaining about the car or its performance,just wanted to share the mystery of my dyno experience.merry chrstmas to all.
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#19
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My Chassi Dyno ships I have from my dakota are ridiculus too. From what I see on my slip is the trans shifted at the begining of the pull causing a faulty reading. If I look at the actual numbers and ommit the numbers that are too far off to be plausible I find a much more believable number.
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#20
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Maybe it's because the dynos are in Australia, where water spins in the opposite direction when it goes down a drain?
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#21
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No, I got it. He is in Oz, he must be using this! http://www.impulsengine.com/pressrelease.shtml
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#22
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What are the rpms for the peak power and peak torque? Does the torque curve have two peaks, the biggest in the low rpm and then another at about 4000-5000? What is your stall speed?
I think what you have is "ghost torque", it's because of the converters torque multiplication close to the stall speed rpm, I have seen that before. 430 hp rw power is pretty good figure for that kind of a engine, and with the 292/.509 cam a typical 440 should make the peak power at around 5500 rpm. |
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