dyno results from 406sbc - Chevelle Tech
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  #1  
Old Jun 17th, 05, 1:52 PM
tlowe tlowe is offline
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Default dyno results from 406sbc

guys, took my 406 off the dyno the other day and thought i'd put the numbers out here for you to give me your 2 cents. i thought it would have produced more torque than it did. i don't know how to post this neetly. maybe somebody can help with that also. combo, 400 standard bore motown block. 3.8 stroke, 6.0 rod, mahle forged flat top pistons. appro 10.75 comp ratio. zero decked. 74 cc AFR 195 heads ran out of the box. lunati sollid roller 249/ 258 @ 50 285/290 advert 112 degree, .571 lift at cam w/ 1.6 rockers. isky red zone lifters #372-rh .victor jr port matched, holley hp 750 w/ mech sec jetted 79 square. 1 3/4 cicle track headers. the engine made 480 ft lbs @ 4900 and 503 hp @ 6200. the torque curve was very flat and fell off about 6700 rpm. i thought the torque would have been higher, maybe 500 ft lbs. open to your ideas. p.s. had a terrible time with a couple of MSD ready to run distributors. timing was all over and unstable. finnally used a hei to dyno it. also tried a mighty demon 750 dp and gain no power or torque, the fuel curve looked more stable though.
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Last edited by tlowe; Jun 17th, 05 at 3:55 PM.
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  #2  
Old Jun 17th, 05, 2:40 PM
hoffbug hoffbug is offline
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Question Re: dyno results from 406sbc

What was your air/fuel ratio with the 79 jets? What was your total timing set at?
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  #3  
Old Jun 17th, 05, 2:43 PM
tlowe tlowe is offline
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Default Re: dyno results from 406sbc

at low rpms 13 ish, with higher rpms it was 12.5 ish. timing was best at 36.
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Old Jun 17th, 05, 2:57 PM
SS_Dave SS_Dave is offline
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Default Re: dyno results from 406sbc

I think your torque numbers are pretty good for 409 cubes.
But, I guess you just always want more.
Excellent HP numbers too.

With some chassis tuning, you should scrape the bottom of the 12's, and
maybe break 11's.

nice job.

Dave
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  #5  
Old Jun 17th, 05, 3:37 PM
greg_moreira greg_moreira is offline
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Default Re: dyno results from 406sbc

Those are real nice numbers, especially with the flat curve. Thats what really matters, and as long as you put the power down efficiently through a drivetrain that is good for that motor, it would run into the 11's no problem. If you were looking for higher peak numbers, a tighter LSA and one of the 210cc AFR heads would have pumped up those peaks with a steeper power curve, but it would not be as nice to drive. The 112 LSA cam should make a nice broad curve, and being that its a roller cam teamed with 195cc heads on top of 400+ inches, throttle response should be very crisp. You might be a little dissapointed about what showed up on paper, but come back and let us know how you like it after you do some driving and racing(meaning, how fast is it, and how nice does it drive around on the street for being as fast as it is).
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Old Jun 17th, 05, 3:47 PM
tlowe tlowe is offline
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Default Re: dyno results from 406sbc

i can't wait to get it in and running. on the dyno @ 6500 it just had that mean smooth thundering sound. you kind that makes the hair stand up on your neck. it should be a real adrenaline rush in the car and banging gears will make it a real handful.
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  #7  
Old Jun 17th, 05, 5:20 PM
The Money Pit The Money Pit is offline
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Default Re: dyno results from 406sbc

I just got my 406 up and running,but not on the street yet.My flat tappet solid is fairly close in size to your roller,and I put it in at 108,which was straight up in my case.Mine is an Isky Z-35 and has 108 LC,254/254@.050 and my lift is .544/.544 after lash with 1.60 rockers.I haven't dynoed yet,but I guess it would pull fairly close to the 500-525 hp mark.
Broke the cam in last weekend with light springs,and I was amazed at how smooth it felt. Put my hand on the air cleaner and barely feel it running at 3000.(Different story at idle........mucho fender shake.)
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Old Jun 17th, 05, 5:36 PM
tlowe tlowe is offline
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Default Re: dyno results from 406sbc

i would post the dyno results in full if anyone can help me figure it out. tom
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  #9  
Old Jun 17th, 05, 7:34 PM
DEEBOO DEEBOO is offline
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Default Re: dyno results from 406sbc

Your number are very close to what I had on the dyno with my SBC 409. We have a lot of similar parts, I was able to crack the 500TQ with a DP. The 3310 kept me in the 480ish range. It's a lot of fun on the street especially when you can burn rubber at 50mph rolling.
Take a look at the dyno results:
http://community.webshots.com/user/dtl504
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Old Jun 17th, 05, 7:59 PM
greg_moreira greg_moreira is offline
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Default Re: dyno results from 406sbc

If it makes you feel any better, you are definitely on the right track as far as putting a good engine combo together goes. Here is a little story of somebody who is not on the right track and who probably would not beleive you when you told him what you built. Back at my old job when I was going to college, I got along all right with one of our HVAC guys cause he was a car buff. But he was one of those guys that didnt know a lot, but really really thought he did and was COMPLETELY stuck in his ways.

He was telling me about the 454 going together for his drag camaro that he would also drive on the street too. I asked him what the buildup was like and he told me it was a 468 with ported stock heads but he didnt know what casting they were, 12.5:1 compression, a solid roller camshaft(he did not know those specs either but the lift was around .680 he said) strip dominator intake, and a 1050 dominator carb. I though hey, that sounds real healthy if its done right. Are you trying to wring 700 horses out of that thing? He said no, him and his builder are working together on this motor trying to get 500 torque and 500 horsepower out of it if possible. And since someone else is basically putting it together, thats why he didnt know the specs on a lot. I tried to tell him that he is either gonna end up with way more motor than he bargained for, or something is up cause it sounds like they are way overdoing this motor(cam and compression wise) if all they seek is around 500 horses.

I provided some suggestions of what should meet his goal in a much milder package and he told me I was nuts cause they have been working with this same core motor for a while and have not yet come close. By the way, he wanted this power at the crank, not the back wheels. If it were 500/500 on a chassis dyno, I wouldnt have spoken up cause it makes more sense. I told him about the motor in my uncles el camino that was for sale at the time. It was a 468 with 12:1 comp, dart pro 1 aluminum heads and a solid roller cam and that this motor put 550 down on a chassis dyno and it should be nearing 700 at the crank. He just said that I must be crazy. It would take an alcohol burner with much more comp, more cubes and more carb to make 700 horses. I just let it go at that. Later on he came back and happily declared that they got a little over 500 horses. I guess they must have had a set of peanut ports with a bad port job, totally the wrong cam, and a terrible carb and ignition tuneup. He also finished it with a 4.11 gear and 3500 converter and is trying for mid 11 second timeslips but no faster than 11.50 cause he does not want to cage it.

He would tell you that your completely full of it if you told him you made basically the same power out of a small block 408 with almost two points less of compression. Thats definitely a lot better motor you have there than what many people build and that cause it sounds to have been done well for its purpose and everything in the combo is matched nice. Its good to the point that many people would not beleive you unless they saw it.......and then they still wouldnt beleive you. Good job and good luck with that motor.
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