406 on the Dyno!
Thread Starter
Instructor
Joined: Aug 2004
Posts: 142
Likes: 1
From: Minnesota
406 on the Dyno!
The new 406 went on the dyno yesterday morning. Didn't hit the 400hp mark as hoped, only got to 361hp, but tons of torque. 455lbft not really at peak, more like a plateau. The dyno could only start at 3200rpm, no lower, and it made 455 right from there (probably starting about 2900...) all the way through 4000 before dropping 
Plus, it idles like a dream at 900rpm. 5500 redline. Looks like this thing could pull some great numbers if I ever cammed it up.
Here's some video: Video 1 Video 2
-=Boston!=-
Plus, it idles like a dream at 900rpm. 5500 redline. Looks like this thing could pull some great numbers if I ever cammed it up.Here's some video: Video 1 Video 2
-=Boston!=-
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Still those are numbers that will put a grin on your face when you are getting on the loud pedal. I bet you can't wait to put it in the car.
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Racer
Joined: Feb 2004
Posts: 324
Likes: 0
From: Wet Coast
Originally Posted by Boston!
The new 406 went on the dyno yesterday morning. Didn't hit the 400hp mark as hoped, only got to 361hp, but tons of torque. 455lbft not really at peak, more like a plateau. The dyno could only start at 3200rpm, no lower, and it made 455 right from there (probably starting about 2900...) all the way through 4000 before dropping Plus, it idles like a dream at 900rpm. 5500 redline. Looks like this thing could pull some great numbers if I ever cammed it up.
Here's some video: Video 1 Video 2
-=Boston!=-
Plus, it idles like a dream at 900rpm. 5500 redline. Looks like this thing could pull some great numbers if I ever cammed it up.Here's some video: Video 1 Video 2
-=Boston!=-
Racer
Joined: Nov 2001
Posts: 379
Likes: 0
From: Helsinki
Originally Posted by Boston!
The new 406 went on the dyno yesterday morning. Didn't hit the 400hp mark as hoped, only got to 361hp, but tons of torque. 455lbft not really at peak, more like a plateau. The dyno could only start at 3200rpm, no lower, and it made 455 right from there (probably starting about 2900...) all the way through 4000 before dropping Plus, it idles like a dream at 900rpm. 5500 redline. Looks like this thing could pull some great numbers if I ever cammed it up.
Here's some video: Video 1 Video 2
-=Boston!=-
Plus, it idles like a dream at 900rpm. 5500 redline. Looks like this thing could pull some great numbers if I ever cammed it up.Here's some video: Video 1 Video 2
-=Boston!=-
Thread Starter
Instructor
Joined: Aug 2004
Posts: 142
Likes: 1
From: Minnesota
Peak HP: 363.5 Peak TQ: 453.9
The motor's set up with Dart Pro 2s, 9.4CR, cast crank (internally balanced), HT pistons, forged rods, and my rebuilt Q-jet. It was built to run a stock converter, and thus be mild-mannered. My builder (Shanon's Engineering in New Haven, MN) used a cam that would start making power down around 1250. Oddly enough, he won't give me the specs on the cam.
I'd be wondering about the HP too, if I didn't see the TQ numbers it's putting out down so low. Hopefully it will go in the car next weekend!
-=Boston!=-
The motor's set up with Dart Pro 2s, 9.4CR, cast crank (internally balanced), HT pistons, forged rods, and my rebuilt Q-jet. It was built to run a stock converter, and thus be mild-mannered. My builder (Shanon's Engineering in New Haven, MN) used a cam that would start making power down around 1250. Oddly enough, he won't give me the specs on the cam.
I'd be wondering about the HP too, if I didn't see the TQ numbers it's putting out down so low. Hopefully it will go in the car next weekend!
-=Boston!=-
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
Originally Posted by Boston!
Peak HP: 363.5 Peak TQ: 453.9
The motor's set up with Dart Pro 2s, 9.4CR, cast crank (internally balanced), HT pistons, forged rods, and my rebuilt Q-jet. It was built to run a stock converter, and thus be mild-mannered. My builder (Shanon's Engineering in New Haven, MN) used a cam that would start making power down around 1250. Oddly enough, he won't give me the specs on the cam.
I'd be wondering about the HP too, if I didn't see the TQ numbers it's putting out down so low. Hopefully it will go in the car next weekend!
-=Boston!=-
The motor's set up with Dart Pro 2s, 9.4CR, cast crank (internally balanced), HT pistons, forged rods, and my rebuilt Q-jet. It was built to run a stock converter, and thus be mild-mannered. My builder (Shanon's Engineering in New Haven, MN) used a cam that would start making power down around 1250. Oddly enough, he won't give me the specs on the cam.
I'd be wondering about the HP too, if I didn't see the TQ numbers it's putting out down so low. Hopefully it will go in the car next weekend!
-=Boston!=-
That's sounds alittle strange that your engine builder will not supply you with your cam specs...you should really have them...
Racer
Joined: Feb 2004
Posts: 324
Likes: 0
From: Wet Coast
That sounds like a good motor for a tow truck, not a Corvette! I have a 476 hp/500 ft lb 406 that pulls full throttle from 1500 rpm with a manual (no converter stall) and idles like a champ at 750 rpm. Geez, I normally skip gears because of the torque. There is no reason to go with a 283 ci cam!
Thread Starter
Instructor
Joined: Aug 2004
Posts: 142
Likes: 1
From: Minnesota
It sounded like the deciding factor was the stock TC. I was led to believe that this was about a 1600-1700 stall converter on a stock TH400 in a Vette? My builder made it sound like he thought it was closer to 1200. Anyone have insight on this?
That may have been why such a small cam was chosen.
-=Boston!=-
That may have been why such a small cam was chosen.
-=Boston!=-
Team Owner
Joined: Sep 2001
Posts: 30,958
Likes: 0
From: Middletown Connecticut
Cruise-In IV Veteran
uhm.... your engine builder should have built the engine on the convertor specs BEFORE installing that cam
I hate to say it but he seems very shady if he doesnt know his convertors
I hate to say it but he seems very shady if he doesnt know his convertors