Pump gas 557 Build Dyno results.... - Chevelle Tech
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post #1 of 18 (permalink) Old Nov 27th, 19, 10:53 AM Thread Starter
 
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Pump gas 557 Build Dyno results....

4.5 x 4.375 x 6.385" 9.800 Deck ***********edited by Tom to correct per OP
AFR Castings with Foxwell Port Program
Sniper Jr Fully Ported by Foxwell
QFT Dominator
Lemons 2 1/8" header **Note over the Dyno 2.5" headers the lemons gain a max of 60#/ft and an average of 35#. Nice Gain
Straub Custom Solid Roller 4/7
Morel Black Mamba
Stef's Wet Sump Chassis Pan
Star Vacuum Pump
Driven Oil
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Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?

Last edited by Tom Mobley; Nov 28th, 19 at 5:40 PM.
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post #2 of 18 (permalink) Old Nov 27th, 19, 1:03 PM
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Re: Pump gas 557 Build Dyno results....

Chris,why did you use a tall deck block ??
Guy

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post #3 of 18 (permalink) Old Nov 27th, 19, 1:21 PM Thread Starter
 
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Re: Pump gas 557 Build Dyno results....

Quote:
Originally Posted by GuysMonteSS View Post
Chris,why did you use a tall deck block ??


Guy
I will revise, it is a low deck...6.385 rod.
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Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #4 of 18 (permalink) Old Nov 27th, 19, 1:22 PM Thread Starter
 
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Re: Pump gas 557 Build Dyno results....

To late to edit...
4.5 x 4.375 x 6.385" 9.800 Deck
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Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #5 of 18 (permalink) Old Nov 28th, 19, 10:26 AM
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Re: Pump gas 557 Build Dyno results....

Interesting results with the headers shows how detrimental going to big on something can have on the combo.
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post #6 of 18 (permalink) Old Nov 28th, 19, 5:46 PM
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Re: Pump gas 557 Build Dyno results....

yeah and it's worse on the real road or track. Still can't drive a dyno or a flowbench.

edited your OP per your update Chris
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post #7 of 18 (permalink) Old Nov 28th, 19, 8:06 PM
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Very nice combo.
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post #8 of 18 (permalink) Old Nov 29th, 19, 10:28 AM
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Re: Pump gas 557 Build Dyno results....

What cc are the intake runners?
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post #9 of 18 (permalink) Old Dec 1st, 19, 1:48 PM
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Re: Pump gas 557 Build Dyno results....

Quote:
Originally Posted by Lew540 View Post
What cc are the intake runners?
These runners are probably in the 340cc range. Haven't checked one so I'm guessing.

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post #10 of 18 (permalink) Old Dec 1st, 19, 2:42 PM
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Re: Pump gas 557 Build Dyno results....

You guys just don't like oil pressure.

Yeah, yeah, it's a dyno
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The 7.99 at 173mph pass:


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8.02 at 171mph:


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post #11 of 18 (permalink) Old Dec 1st, 19, 3:07 PM
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Re: Pump gas 557 Build Dyno results....

Quote:
Originally Posted by Calculated Risk View Post
You guys just don't like oil pressure.

Yeah, yeah, it's a dyno
That last pass is the only one where oil pressure fell off like that. I think a few things played into it (as usual); yes, it's on the dyno and sitting flat, so a lot of oil is draining back to the front of the engine into the shallow part of the pan. That oil is going to get picked up by the crank, especially with a 4-3/8 stroke and short rods. That becomes a windage issue and it's oil NOT getting back in the sump, so on a longer, higher rpm pull like that, the oil level drops significantly and takes longer to recover. That stroke and rod combo, in and of itself, is going to start showing windage issues above 7000, which is where it showed on the dyno. If you look at the other pulls, the oil pressure was steady to 7K. On that pull, I also think the oil got hot. We heated up the engine to do the lash. Water temp came down pretty quick as it was a cool day so we had to heat the water back up and I think the oil came up a little hotter than usual. (We didn't have the temp probe in the pan because of the headers). By the time we did that last pull I'm guessing oil was over 200*. I can tell by the way it didn't recover at idle very quickly at the end of the pull...that, and the oil level was lower than normal.
I've said it before and I'll say it again...yes, it's the dyno, not a moving engine. I've had 3 drivers put go-pro's on their oil gauges going down the track and never an issue, ever. Never had a single bearing issue in any engine I've ever built, so I quit worrying about it.
Here's a vid of the pull:

https://www.facebook.com/17683172238...649326687/?t=2

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post #12 of 18 (permalink) Old Dec 1st, 19, 3:35 PM
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Re: Pump gas 557 Build Dyno results....

Few more pics;

Big 'ol headers...just like heads that are too big...can kill power.



Best pull with customer headers before lash change. Notice how power peaks around 6700 and just sort of hangs out for a few hundred rpm. Also notice oil pressure is solid.



This is the difference between dyno headers and customer headers;



And here's what .004" of lash can get you:

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post #13 of 18 (permalink) Old Dec 4th, 19, 7:50 PM
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Re: Pump gas 557 Build Dyno results....

Curious to know the cam spec`s.
Care to share ?

Steve
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post #14 of 18 (permalink) Old Dec 5th, 19, 9:52 AM Thread Starter
 
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Re: Pump gas 557 Build Dyno results....

Quote:
Originally Posted by BigRed-L72 View Post
Curious to know the cam spec`s.
Care to share ?
Mid 700 range lift
Duration high 260 range/low 270's
LSA lower than 110

Cam is customers and he wants exact specs to himself.

Chris Straub
Mfg Performance Parts

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Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #15 of 18 (permalink) Old Dec 6th, 19, 10:15 AM
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Re: Pump gas 557 Build Dyno results....

Quote:
Originally Posted by cstraub View Post
Mid 700 range lift
Duration high 260 range/low 270's
LSA lower than 110

Cam is customers and he wants exact specs to himself.
Thanks Much

Steve
68 BISCAYNE 4060lb
468-9.4:1
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