Desktop Dyno for 406, please?
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Desktop Dyno for 406, please?
Can someone run this info for me?
406 CI
5.7 Rods
Stock 400 crank 3.75 stroke
flat top piston
Bore 4.155
72CC heads
215CC Dart Pro-1 heads aluminum 2.08 Intake & 1.625 Ex As Cast
Intake Miniram II w/1206 gasket
Throttle body 58 MM = 1000CFM
Rocker arms 1.6 comp cams 7/16" stud
Hydraulic Roller Lifters Comp cams retro roller
Roller cam single pattern .525 lift and 225 duration at .500
rear gear 3:07
Tranny T-10 Doug Nash 4+3 1st=2.88, 2nd=1.91, 3rd=1.33 4th=1.0
Hooker 2151 headers 1-3/4 primary w/3 collectors
Did I leave anything out?
TIA
406 CI
5.7 Rods
Stock 400 crank 3.75 stroke
flat top piston
Bore 4.155
72CC heads
215CC Dart Pro-1 heads aluminum 2.08 Intake & 1.625 Ex As Cast
Intake Miniram II w/1206 gasket
Throttle body 58 MM = 1000CFM
Rocker arms 1.6 comp cams 7/16" stud
Hydraulic Roller Lifters Comp cams retro roller
Roller cam single pattern .525 lift and 225 duration at .500
rear gear 3:07
Tranny T-10 Doug Nash 4+3 1st=2.88, 2nd=1.91, 3rd=1.33 4th=1.0
Hooker 2151 headers 1-3/4 primary w/3 collectors
Did I leave anything out?
TIA
Melting Slicks
Joined: Feb 1999
Posts: 3,349
Likes: 1
From: Colorado
Re: Desktop Dyno for 406, please? (ld85)
You're gonna like this.
558 lb-ft @ 3500 rpm
474 hp @ 5000 rpm.
And it starts out right off of idle at 500 lb-ft.
You did leave out the LSA but I guessed at 112 degrees, which is probably about right. This is through high flow headers and mufflers.
Compression ratio math with a zero decked block came out to be 11.25:1. It's probably not THAT accurate because I do not know the deck height of a Chevy 400, so I guessed at 0. Anyone have more specific info about that with 5.7 inch rods?
With aluminum heads, that's really pushing it for pump gas, but it might work. You can drop that a bit further with AirFlow Research 74 cc heads.
[Modified by Bearcat, 6:10 PM 3/13/2003]
558 lb-ft @ 3500 rpm
474 hp @ 5000 rpm.
And it starts out right off of idle at 500 lb-ft.
You did leave out the LSA but I guessed at 112 degrees, which is probably about right. This is through high flow headers and mufflers.
Compression ratio math with a zero decked block came out to be 11.25:1. It's probably not THAT accurate because I do not know the deck height of a Chevy 400, so I guessed at 0. Anyone have more specific info about that with 5.7 inch rods?
With aluminum heads, that's really pushing it for pump gas, but it might work. You can drop that a bit further with AirFlow Research 74 cc heads.
[Modified by Bearcat, 6:10 PM 3/13/2003]
Melting Slicks
Joined: Feb 1999
Posts: 3,349
Likes: 1
From: Colorado
Re: Desktop Dyno for 406, please? (Bearcat)
Your 4+3 will blow up quickly with that motor. That is WAY WAY too much torque for a 4+3, IMO. I would suggest either a Muncie 4-speed, M21 or M22, or better yet a Tremec TKO 5 speed OD.
Pro
Joined: Dec 2001
Posts: 708
Likes: 0
From: Renton Wa
Re: Desktop Dyno for 406, please? (fourthgencorvette)
off the topic of that nice engine, But I was in a strong choosing state between the 5.7 and 6 inch rod, yeah 6 inch rod seems to be a much more popular setup, but I did not like the how the pin hole was in the middle of the oil ring, seems to weaken it to me. Thats just my thoughts.
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: Desktop Dyno for 406, please? (fourthgencorvette)
BEARCAT, thank you very much, yes I forgot the LSA and your figure is correct.
QUOTE: With aluminum heads, that's really pushing it for pump gas, but it might work. You can drop that a bit further with AirFlow Research 74 cc heads. END QUOTE
Iagree, I am sure we will talk about the compression when I visit my builder today. I really dont want more than 10:1 CR.
My builder is looking for the 6.0 rods, I should know something today. But as WASHINGTON RACER stated, the top ring gets smaller or eats into the wrist pin area so he is looking to see what he can find, I really like the 5/64" top ring myself.
BTW, they will begin boring, decking, balancing etc the 509 casting block on Monday! I am starting to get pumped!
[Modified by ld85, 3:59 AM 3/14/2003]
QUOTE: With aluminum heads, that's really pushing it for pump gas, but it might work. You can drop that a bit further with AirFlow Research 74 cc heads. END QUOTE
Iagree, I am sure we will talk about the compression when I visit my builder today. I really dont want more than 10:1 CR.
any reason you are not using 6" rods? That would be my choice over 5.7" rods for a better r/s ratio................
BTW, they will begin boring, decking, balancing etc the 509 casting block on Monday! I am starting to get pumped!
[Modified by ld85, 3:59 AM 3/14/2003]
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: Desktop Dyno for 406, please? (Bearcat)
Your 4+3 will blow up quickly with that motor. That is WAY WAY too much torque for a 4+3, IMO. I would suggest either a Muncie 4-speed, M21 or M22, or better yet a Tremec TKO 5 speed OD.
But if/when it goes, a 6 speed will be installed!
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Re: Desktop Dyno for 406, please? (ld85)
Hey Larry, take a look at your r/s ratio with 5.85 rods. They're a little harder to find, but it gets you the best of both worlds :D That's what I ended up settling in on with my 420!
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Melting Slicks
Joined: Feb 1999
Posts: 3,349
Likes: 1
From: Colorado
Re: Desktop Dyno for 406, please? (Caboboy)
I am looking for a good reference on different Chevy engines and their compression heights, deck heights, and all specifications. Any suggestions? Because the kids they have running the phones at Summit, Speedomotive, Paw, Jegs, etc. seem to have lost the ability to talk facts with you about compression ratios when you use this crank, that block, those rods and these pistons. All I get is "Sir, we don't have access to that information". Well they used to. I just need to learn how to do those calculations myself, so I don't need their help. Anyone know of any good books I could try?
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: Desktop Dyno for 406, please? (Bearcat)
Hey BEARCAT, I read three books cover to cover
1. SBC Performacne:1982 and later : John Baechtel
2. Lingenfelter’s: How to Build Performance Engines
3. How to Build Performance SBD on a budget! David Vissard
I can mail any of them to you to read if you like, just send it back,,, each book is @ $20.00
Then I spent countless hours on the web so, its a learn as you go thing!
Also I just got back from http://www.indyheads.com and I sprung for the bowl port, short turn radius polish and gasket match for the Dart Pro-1 alum/heads.! Springs for a max of .550" lift out the door for under $1400.00
:lolg: :hurray: :hurray: :hurray: :lolg:
[Modified by ld85, 4:44 PM 3/14/2003]
1. SBC Performacne:1982 and later : John Baechtel
2. Lingenfelter’s: How to Build Performance Engines
3. How to Build Performance SBD on a budget! David Vissard
I can mail any of them to you to read if you like, just send it back,,, each book is @ $20.00
Then I spent countless hours on the web so, its a learn as you go thing!
Also I just got back from http://www.indyheads.com and I sprung for the bowl port, short turn radius polish and gasket match for the Dart Pro-1 alum/heads.! Springs for a max of .550" lift out the door for under $1400.00
:lolg: :hurray: :hurray: :hurray: :lolg:
[Modified by ld85, 4:44 PM 3/14/2003]
