It finally works
#2756299
03/26/20 09:42 PM
03/26/20 09:42 PM
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Joined: Nov 2015
Posts: 877 Missouri
jwb123
OP
super stock
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OP
super stock
Joined: Nov 2015
Posts: 877
Missouri
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Last summer I retired and on my bucket list was to build an engine dyno for my shop so I bought a pile of parts and have dynoed three engines so far,to get some experience , it is an older 13 inch dynomite by land and sea, with manual load control, which took a learning curve. Today I did the engine for my race car, 540 RB world product block, 4.5 bore, 4.25 stroke, .740 lift Jones cam, pro comp heads Victor Jr copies, I ported and polished, in NSS trim with two 750 AFB's It made 773 ft. lbs torque and 771 horsepower. pretty happy with it. The Engine I blew up last year and windowed the block, took me all summer to get the block fixed and enough money to put together a new short block. Got it together this winter and just been waiting to get the bugs out of the dyno, which is another story.
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Re: It finally works
[Re: jwb123]
#2756381
03/27/20 02:18 AM
03/27/20 02:18 AM
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Joined: Oct 2006
Posts: 1,264 New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,264
New York, USA
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That’s both impressive and awesome!!! Congrats on achieving that goal. I can imagine the difficulties and issues to work out with a project like that. And nice results with your engine.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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Re: It finally works
[Re: Chargerfan68]
#2756382
03/27/20 05:02 AM
03/27/20 05:02 AM
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Joined: Mar 2009
Posts: 2,464 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,464
Sydney,Australia
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Awesome effort and result
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: It finally works
[Re: jwb123]
#2756479
03/27/20 01:34 PM
03/27/20 01:34 PM
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Joined: Aug 2003
Posts: 43,195 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
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I can't tell due to the light reflection on the screen masking the lower readings, does the HP and torque lines cross at 5200 to 5300 RPM? The reason I'm asking is they are suppose to according to all the dyno operator, owners say when I have used their dyno
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: It finally works
[Re: Cab_Burge]
#2756542
03/27/20 04:49 PM
03/27/20 04:49 PM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
master
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master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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I can't tell due to the light reflection on the screen masking the lower readings, does the HP and torque lines cross at 5200 to 5300 RPM? The reason I'm asking is they are suppose to according to all the dyno operator, owners say when I have used their dyno Here is my quick fix of his Dyno screen. I darkened out the harsh bright light and then added the 500 RPM jumps at the top and put a line down around the 5200 RPM line.
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: It finally works
[Re: 66coronet]
#2756571
03/27/20 06:03 PM
03/27/20 06:03 PM
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Joined: Nov 2015
Posts: 877 Missouri
jwb123
OP
super stock
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OP
super stock
Joined: Nov 2015
Posts: 877
Missouri
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What intake are you running? Single feed or dual feed edelbrocks? I am running two 9755S federal mogul AFB's 750 cfm, yes they are converted to dual feed. The needles and seats also have windows cut into them. I also extended the primary boosters as was discussed on a thread a while back. I trimmed the secondary weights down to 102 grams. I used the velocity probe on my flow bench with a brass rod soldered into a jet so I could see what each booster pulled on the bench. With the stock booster they pulled 194 to 198 feet per second at 10 inches of water, with the extended boosters they pulled 220 to 229 feet per second. The intake is a victor jr. for max wedge ports that I fabricated a top for, and made some dams in the inside. It is 3 tenths faster than a 1964 factory cross ram, with no other changes. Never had the old cross ram on a dyno.
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Re: It finally works
[Re: Cab_Burge]
#2756574
03/27/20 06:10 PM
03/27/20 06:10 PM
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Joined: Nov 2015
Posts: 877 Missouri
jwb123
OP
super stock
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OP
super stock
Joined: Nov 2015
Posts: 877
Missouri
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I can't tell due to the light reflection on the screen masking the lower readings, does the HP and torque lines cross at 5200 to 5300 RPM? The reason I'm asking is they are suppose to according to all the dyno operator, owners say when I have used their dyno They HP and torque lines on a graph will always cross at 5,250 because that is the constant used to calculate HP The dyno only measures torque, then records the rpm and then calcualtes HP using the formula (RPM x T)/5252=HP, where RPM is the engine speed, T is the torque, and 5,252 is radians per second.
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Re: It finally works
[Re: jwb123]
#2756582
03/27/20 06:25 PM
03/27/20 06:25 PM
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Joined: Apr 2008
Posts: 117 Aus
hysteric
member
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member
Joined: Apr 2008
Posts: 117
Aus
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What intake are you running? Single feed or dual feed edelbrocks? I am running two 9755S federal mogul AFB's 750 cfm, yes they are converted to dual feed. The needles and seats also have windows cut into them. I also extended the primary boosters as was discussed on a thread a while back. I trimmed the secondary weights down to 102 grams. I used the velocity probe on my flow bench with a brass rod soldered into a jet so I could see what each booster pulled on the bench. With the stock booster they pulled 194 to 198 feet per second at 10 inches of water, with the extended boosters they pulled 220 to 229 feet per second. The intake is a victor jr. for max wedge ports that I fabricated a top for, and made some dams in the inside. It is 3 tenths faster than a 1964 factory cross ram, with no other changes. Never had the old cross ram on a dyno. Nice work! Stock Jetting?
Last edited by hysteric; 03/27/20 06:27 PM.
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Re: It finally works
[Re: jwb123]
#2757045
03/28/20 10:28 PM
03/28/20 10:28 PM
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Joined: Aug 2003
Posts: 43,195 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
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Which type of fuel are you using, race or pump? Have you ran it leaner to find out what is to lean? If not, why not I know that all systems, O2 and dyno software, are not exactly the same so what I have seen on other motors does not make it the same as yours, and visa versus I've always went richer first, at the track or a on any type of dyno,chassis or engine, and then went the other way on the tuning and mixtures and I made sure of where the happy spots where on jetting and timing as well as when and where it would start to loose power, up or down
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: It finally works
[Re: Cab_Burge]
#2757170
03/29/20 11:22 AM
03/29/20 11:22 AM
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Joined: Nov 2015
Posts: 877 Missouri
jwb123
OP
super stock
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OP
super stock
Joined: Nov 2015
Posts: 877
Missouri
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running 110 fuel, I left the engine a little rich, because from my experience while the dyno is a great tool to work out a lot of things, I have never had carb jetting on a dyno be the best at the track, so I leave them a little rich and fine tune at the track. The other reason is my dyno is an older manual load control type, and I don't think I have the skill to find 5 or 10 horsepower changes, to thrash my combination any closer. If I had a dyno with electronic load control, then I would probably fine tune more. Just from the four engines I have dynoed, I can get the torque to repeat really close but the horsepower changes 5 to 10 with most pulls. The reason is with a manual controlled dyno the operator has to twist water flow control valve, listen to the sound of the engine and watch the tach, to keep the acceleration rate the same through the entire pull. That is very hard to do, at least for me. Land and Sea says 800HP is about the limit of my water brake, and my engine is getting close, so it makes it hard to stop the engine from accelerating faster in the last say 1,000rpm, which is where the highest HP numbers normally come from. What I look at is the cylinder temperatures, O2 readings, and plug color to tell me when it as good as its going to get.
At the college where I retired from we had a Mustang eddy curent engine dyno, with electroic load control, and it would repeat within a couple horsepower if you keep an eye on water and oil temperatures for each run. And I could set the ramp rate to what ever I wanted, and by changing the ramp rate you could change the horsepower and torque readings of the same engine with no changes. And the Mustang was rated to 1,500 horsepower. But the unit at school cost $60,000 I got $15,000 in mine. Like I told the girlfriend, the Dyno is something I just always wanted and it is cheaper than a decent used car. Plus I should be able to sell it and get most of my money back one day.
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Re: It finally works
[Re: jwb123]
#2757545
03/30/20 11:13 AM
03/30/20 11:13 AM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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At the college where I retired from we had a Mustang eddy curent engine dyno, with electroic load control, and it would repeat within a couple horsepower if you keep an eye on water and oil temperatures for each run. And I could set the ramp rate to what ever I wanted, and by changing the ramp rate you could change the horsepower and torque readings of the same engine with no changes. And the Mustang was rated to 1,500 horsepower. But the unit at school cost $60,000 I got $15,000 in mine. Like I told the girlfriend, the Dyno is something I just always wanted and it is cheaper than a decent used car. Plus I should be able to sell it and get most of my money back one day.
I sure you know, but the reason the HP and torque change at different ramp rates is because you are using up torque accelerating the metal inside/attached to the engine. One way to get a "true" HP reading is a steady state test. Stopping at each test rpm and take a reading. About 4 years ago, I was up at Superflow for a class and was complaining about this very issue. Short version is we talked to their engineers and they now have a inertia correction factor. Each engine is different and it's kinda a pain to setup, but when it's set it doesn't matter if the rate is steady state or 100, 300, 600 rpm per sec, the HP and torque give the same results. Joe PS so cool you built your own!!!
Last edited by sr4440; 03/30/20 11:16 AM.
Without Data, you’re just another guy with an opinion.
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Re: It finally works
[Re: jwb123]
#2757699
03/30/20 06:34 PM
03/30/20 06:34 PM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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The only book i have read on the subject is "Dyno Testing and tuning" by Harold Betts. It's not a bad book. I can tell you one thing, don't be afraid to believe the data. a lot of times it will be different then "conventional wisdom".
Joe
Without Data, you’re just another guy with an opinion.
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