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Hates: Liver. Loves: Diesel
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5,618 Posts
Discussion Starter #1
Ok, so you don't win anything.

I'm building an engine and I've run a hundred permutations through desktop dyno, but its not returning reliable results. Its saying that my peak HP will be higher than I think it should be. So, I need you all to guess crankshaft hp AND the peak's RPM. I'll be actually dyno-ing this engine in a couple months, so we all get to see who's closest.

-chevy 355
-9.15:1 CR, good quench, about .025" in the hole
-Vortec 906 heads, very light pocket porting
-stock valves, 1.94/1.5"
-performer intake, Qjet carb
-high performance manifolds... I'd guess about halfway between a stock manifold and small headers as far as performance.
-cam is melling part number 22124 flat hydraulic, 202/213 duration @50, 1.6 rockers for .428/.437 lift on a 110 LSA

I need your opinions on what RPM peak HP will be, how much HP you think it will be, and maybe even a guess on torque if you want.
 

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Hammer and a torch
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1,254 Posts
Gotta be first... :thumbup:

peak @ 5200/338hp (best pull)

torque @3400/376 ft lbs...
 

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994 Posts
RPM···········1000····1500····2000····2500····3000····3500····4000····4500····5000····5500
Brake_Tq······230·····290·····340·····356·····367·····372·····370·····359·····322·····276
Brake_HP······43.7····82.9····130·····169·····210·····248·····282·····308·····307·····289
Exh_Pres······0.0·····0.0·····.1······.1······.2······.3······.5······.6······.7······.7
Int_Vacuum····.1······.2······.4······.6······.6······.6······.6······.6······.7······.7
Vol_Eff_%·····69.0····73.4····77.4····81.2····85.2····88.3····90.2····90.7····87.6····83.4
Actual_CFM····76.3····122·····171·····224·····283·····342·····399·····451·····485·····507
Fuel_Flow·····27.9····44.5····62.6····82.0····103·····125·····146·····165·····177·····185
A/F_Mix_Qal···68.1····86.6····100.0···99.8····100.0···100.0···100.0···100.0···100.0···100.0
BSFC··········.638····.537····.483····.484····.492····.503····.517····.536····.577····.641
BSAC··········8.006···6.733···6.055···6.072···6.177···6.314···6.490···6.727···7.243···8.047
Friction_HP···6·······11······18······27······37······49······64······82······106·····135
Mach_#········.097····.146····.194····.243····.292····.340····.389····.437····.486····.534
Piston_Spd····580·····870·····1160····1450····1740····2030····2320····2610····2900····3190
Piston_Gs·····65······145·····258·····403·····581·····790·····1032····1306····1613····1952
Overlap_%VE···-2.9····-1.9····-1.4····-1.1····-.9·····-.8·····-.7·····-.6·····-.5·····-.5
Int_AvgVel····62······93······124·····155·····186·····217·····248·····279·····310·····341
In_InertiaPrs·.0······.0······.4······1.0·····1.5·····1.8·····2.0·····2.0·····1.9·····1.6
In_ResTunPrs··0.0·····0.0·····0.0·····.0······.0······.0······.0······.0······0.0·····0.0
Ex_AvgVel·····70······105·····140·····174·····209·····244·····279·····314·····349·····384
ExTun_Prs·····1.6·····1.5·····1.5·····1.4·····1.2·····1.3·····1.2·····1.1·····.9······.9
Lifter_Pump_UpNone····None····None····None····None····None····None····None····None····None
Spark_Adv·····20······24······26······28······29······30······30······31······32······33
 

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Super Moderator
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18,352 Posts
There are 1293 jellybeans in the jar..............................

Well, that is about as close as I am going to get....

My guess, and I stress..."Guess" is......

[email protected] rpm
345 lbs of torque @ 3300rpm

What do I win besides a jar of jellybeans?
 

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7,345 Posts
NAIRB said:
12 horsepower

Doc here... :pimp:


Uuuuhhhh.. and would that be with the cutting blade and bagger attached ? :drunk: :rolleyes:

Gee. I missed something..could have sworn he said SBC not B&S..(Briggs and Stratten) But then , My eyesight is poor.. :D

(sorry, Couldn't resist..)

Doc :pimp:
 

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Hates: Liver. Loves: Diesel
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5,618 Posts
Discussion Starter #11
Thanks all for the guesses. I know there is a bit of a mismatch in peak flow and cam duration; that is to say the vortecs flow more than I need with this cam, but do you really think that hp will peak above 5000?

I was thinking more like 4800-4900, some have said as low as 4600. Desktop Dyno is telling me 5000.

Keep the guesses coming. I personally have to reject the obvious ones, but I do have to laugh at
peak @ 8200/188hp (don't mind the scattered parts)
 

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Hotrodders.com Moderator
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1,642 Posts
trees said:
Nairb is still with us. Welcome back. I'll be in Coldwater on the 9th of Nov.

Trees
I am still with you, but Trees, I moved to Lincoln Nebraska.

I now work as a tech with Speedway Motors. I couldn't handle the prosperity of Cimarron any longer.

Brian
 

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7,341 Posts
docvette said:
Doc here... :pimp:


Uuuuhhhh.. and would that be with the cutting blade and bagger attached ? :drunk: :rolleyes:

Gee. I missed something..could have sworn he said SBC not B&S..(Briggs and Stratten) But then , My eyesight is poor.. :D

(sorry, Couldn't resist..)

Doc :pimp:
it only takes approx 9 hp to move a car down the road at 70 MPH. he's figuring on a high performance engine :D
 

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Hotrodders.com Moderator
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1,642 Posts
firestone said:
Lincoln huh, that's where I live. How long have you lived here?

Adam
I've been working at Speedway since July 11, 2006. I've been actually living in Lincoln for two months.
 

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http://teamrfc.gospelcom.net
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1,742 Posts
Did you ever go to the culvers on 70th and A st on Friday nights? They have a big car show there every weekend during the summer. It is done for the year now though.

Adam
 

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Hotrodders.com Moderator
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1,642 Posts
My wife and I went there about three weeks ago or somewhere there abouts. There were quite a few machines there.

Brian
 
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