400 project
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Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
400 project
I got a 400 block .030 over, rebuilt 400 crank .010 under,silvolite piston,new ring,oil pump,elderbroock performer 400, 600cfm carb elderbroock,x-treme energy 256H ,stock aussie heads.It took me a LOT of time to get all the part.Missing a timing chain and want to rebuilt my aussie head.It took over 8 years to get my parts on a tight budget and still not finish.I wedge that 400 in a 81 mustang then remove for a rebuilt.I never start the 351m in the stangs so i don't know how it's gonna run.I'm a fan about down and dirty and make the replica of that but with a performer manifold,carb and aussie head.How much torque and horsepower should i have.Any suggestion are welcome.my 400 is on a engine stand since yesterday so i'm very happy to finaly put my hand to the wrench.
Elder User
Joined: May 2002
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From: Sin City, USA
Originally Posted by danlee
I need to know the compression height and the dish cc of that Silvolite piston to calculate the compression ratio and the torque and Horsepower.
This piston is listed as 7.9:1 with stock heads. CH is 1.63" while dish is listed as 2.944" diameter x 0.115" deep....that's about 12.83cc....I think, may need to check my math.
Postmaster
Joined: Aug 2001
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From: Delaware
Originally Posted by 73XAFalcon
Dan,
This piston is listed as 7.9:1 with stock heads. CH is 1.63" while dish is listed as 2.944" diameter x 0.115" deep....that's about 12.83cc....I think, may need to check my math.
This piston is listed as 7.9:1 with stock heads. CH is 1.63" while dish is listed as 2.944" diameter x 0.115" deep....that's about 12.83cc....I think, may need to check my math.
I get a flat torque curve with 444, 446,439, 441, 414, 371 ft-lbs torque @ 2000, 2500, 3000, 3500, 4000, and 4500 RPM. The peak HP is 318@4500 RPM.
If you do some porting on the exhaust side, and improve the head flow over stock, the high RPM numbers will come up a little.
This also assumes large tube headers.
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
Originally Posted by father/son
what method do you use to determine those numbers?
The most important result is the shape of the torque curve, flat or peaked at the low RPM side or peaked at the high RPM side.
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Laughing Gas
Joined: Jan 2006
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From: New-brunswick,Canada
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Laughing Gas
Joined: Jan 2006
Posts: 883
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From: New-brunswick,Canada
piston to deck clearence 0,092 bore 4.030 stroke 4" combustion chamber 57.8 cc.I know i call them last year for my dish but can't found where i wrote that.
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Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
Originally Posted by mustang81
i use aussie head not stock head
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
Originally Posted by mustang81
piston to deck clearence 0,092 bore 4.030 stroke 4" combustion chamber 57.8 cc.I know i call them last year for my dish but can't found where i wrote that.
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Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
down & dirty claim to get 382 hp and 436 torque.I use the same think exept the manifold, aussie head and a different cam.I tought to get better numbers? Where is
my lost of 64 hp ? The torque is close but i tought the aussie head will bring my torque higher.Thank you for the number.
my lost of 64 hp ? The torque is close but i tought the aussie head will bring my torque higher.Thank you for the number.
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
Those numbers published in Hot Rod magazine are always inflated. I don't know anyone who has reproduced them. The same is true with the stroker that the built recently. Horsepower is just torque X RPM. If your torque numbers are close, then you just have to get it to rev higher to make more HP. The way to get it to rev higher is with better head flow. They don't say what porting work was done.
My simulations are with mufflers. The published figures may be with open pipes.
My simulations are with mufflers. The published figures may be with open pipes.
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Laughing Gas
Joined: Jan 2006
Posts: 883
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From: New-brunswick,Canada
when my 400 be ready i will bring to the dyno and tell you guys my numbers.318 and 446 is not that bad.The machine shop deck my block because he change 3 sleeves.But not that much..004. and i expect to use roller rocker later after the engine go be in the car.I wondering with tim piston 32 cc 9.5:1 ?
Postmaster
Joined: Aug 2001
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From: Delaware
Originally Posted by mustang81
when my 400 be ready i will bring to the dyno and tell you guys my numbers.318 and 446 is not that bad.The machine shop deck my block because he change 3 sleeves.But not that much..004. and i expect to use roller rocker later after the engine go be in the car.I wondering with tim piston 32 cc 9.5:1 ?