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 Post subject: 351c dyno help
PostPosted: Sun May 22, 2016 10:07 pm 
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Joined: Sat Mar 08, 2014 5:25 pm
Posts: 11
Current combo
351 .30 over trw flat tops with 2 reliefs
Stock crank but balanced and stock rods
Standered oil pump
4v cc heads off a 71 new valves and hardened seats
Port matched torker intake with 2 inch open spacer
Comp xe-274 with matching springs
750 DP Holley 72,82 jets
Msd 6al timing total 36

Made 236hp at 5400 at the wheels
255 torque at 5300
Air/fuel was 11:7 so since then I stepped it down 2 all 4

Not happy with what's is suppose to be a 400plus engine
Anything wrong with this set up?


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 Post subject: Re: 351c dyno help
PostPosted: Sun May 22, 2016 10:08 pm 
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Joined: Sat Mar 08, 2014 5:25 pm
Posts: 11
Compression is 10.5
Running 100 octane


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 5:42 am 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2603
That engine would probably be around 400 hp on an engine dyno. A chassis dyno will suck anywhere from 15-20% of that depending on the transmission, rearend, torque converter, what exhaust you're running, etc.

Your numbers do seem low, but then again, it's pig rich....

You need to get the A/F ratio back up to around 12.5-13:1 at WOT. If you're running 100 octane, I would also run about 38-40 degrees total timing.

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Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 5:59 am 
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Joined: Sat Mar 08, 2014 5:25 pm
Posts: 11
How does my cam look?


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 6:27 am 
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Duration isn't too far off, but the lift is a lot lower than I usually run.

If you went by the recommended valve springs, it could be that they are a little on the soft side as well. Were you getting into any valve float? Can you post a picture of the dyno sheet?

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Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 8:11 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 1018
Location: Texas
Machwone Hey buddy, Matt here. So did you have the engine dynoed before you dynoed at the wheels? What are the details like Brent was saying ie: transmission/converter- rear end/gears - exhaust -mufflers? X pipe or H-Pipe? Exhaust diameter? What headers you running? Also, where do you live, elevation has a part in how much power you make to.


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 8:45 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 1018
Location: Texas
Ya, I think you should be making more power. I was actually just deleting alot of old pictures in my Photobucket and came across my 362 Cleveland rear wheel dyno sheet. 1970 Cougar with: 70 block , cast flat tops 10.25 or so compression, and old hydro flat Wolverine cam 290/290 duration 219/219 @ .05 .505/.505 lift on a 110 or 112 lobe- cant remember. 1.7 roller rockers which really brought the lift down to .496. Aussie 2v heads, out of box Weiand Excelerator 2v intake, 650 Speed Demon carb. Hedman 1 5/8 headers with 3" exhaust/3" h pipe 40 series Delta flows DuraSpark ignition with the crappy "Blue" Ford box C4 with 2500 stall- 9" rearend with 4.11 gears. I also ran my Hoosier DOT slicks when dynoing. If your running regular 14" or 15" street tires you could be loosing traction on the dyno wheels. You need to get your air fuel ratio looking something like the bottom line in my picture.

Image


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 8:54 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 1018
Location: Texas
by the way, here is what the difference was from the begining of dynoing it to the best I could do. See mine was way to lean so I just added bigger secondary jets and bumped the timing to 36 and it was much happier. Also, it was over 100 degrees in the dyno room all day so if it was 20 degrees cooler it would have been much happier.

Image


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 9:13 am 
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Joined: Sat Mar 08, 2014 5:25 pm
Posts: 11
1.73 rockers
Hooker headers 1 7/8 primary's
3 inch to x-pipe then to super 44s then dumped .
Des Moines Iowa
Was 73 that day
Not this was the first dyno ever done
5 speed with 3:80 gears. Car weighs 3,009 with me in it
67 mustang
I'm running a 3.5 power valve my best vacuum was 8 inch
How do you post pictures?


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 Post subject: Re: 351c dyno help
PostPosted: Mon May 23, 2016 10:47 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 1018
Location: Texas
there are a couple different ways to post pics. I use Photobucket. Its free. After you create a Photobucket, upload what ever pics you want to then go to your "library" and copy the "image" link. Then past it in the post you want to.

I believe i was running the stock 6.5 power valve with the 650 and If I remember my vacuum was 11 or 12


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