Dyno Results
Thread Starter
|
Cargo Master
Joined: Apr 2005
Posts: 3,337
Likes: 165
From: Harpswell Maine
Dyno Results
I experienced the value of dyno testing my engine today. I have a good friend that is an engine builder who has an engine dyno. The benefits are more than verifying performance. The engine is a sbc 383 clone that I built for my 49 which I am setting up to be able to tow up to 5000#. My friend did the machine work and I did the assembly. Problems encountered and readily solved included minor contact of the valve covers (CCC!) that was hanging up 2 valves (rocker contacting inside surface of the valve cover, very nice looking CCC ribbed aluminum that don't work!) and a minor oil leak on the plug at the back of the camshaft. All this was found and readily fixed. It would have been a pain once in the truck. The measured dyno performance numbers were a little better than the advertised numbers for the 383 HT with a peak torque of 440 ft-lb at 3600 rpm and peak hp of 345 hp at 4600 rpm. The torque curve is very flat not dropping below 400 ft-lb until 4600 rpm. It has the low rpm grunt that I wanted and idles beautifully at 600-650 rpm, in all just what I wanted for my purposes. It was a good day!
Fleet Owner
Joined: Jul 2004
Posts: 27,288
Likes: 1,053
From: NM
What trans you putting behind that torque monster?
I had that same problem with rockers hitting the inside of valve cover on a motorcycle. It would hold the valve open, no compression. Took me forever to figure it out.
I had that same problem with rockers hitting the inside of valve cover on a motorcycle. It would hold the valve open, no compression. Took me forever to figure it out.
Post Fiend
Joined: Jun 2001
Posts: 7,493
Likes: 7
From: Erie, pa
Thread Starter
|
Cargo Master
Joined: Apr 2005
Posts: 3,337
Likes: 165
From: Harpswell Maine
I have a built 700R4 with a 3.70 9 inch with trac loc behind it. It did take about a hour to figure it out. We experienced a bit of a lumpy firing during initial warm up (before any pulls). The hand held infared temp gun said that #1 and #7 exhaust were lagging in temperature on warm up. We went thru ignition checks first followed by a compression check (which was low) and actually extracted the #7 exhaust lifter with a magnet thru the hole in the intake manifold after removing the dizzy to check the lifter. After that I wiped down the inside surfaces of the valve cover and noticed a couple of shiny spots. That meant that there was a light contact of the rocker that would delay valve closing. The problem with the ccc is that they most likely pull a mold off a good USA built original valve cover and don't compensate for the shrinkage of the aluminum on cooling (I have not checked the coefficient of thermal expansion for aluminum however iirc copper alloys are of the order of 1/8 " per foot)
Thread Starter
|
Cargo Master
Joined: Apr 2005
Posts: 3,337
Likes: 165
From: Harpswell Maine
I think that there will be. To complete the dyno, we put on a set of stamped steel oem (Vortec heads) covers. I plan to take the die grinder to carve out the spots a bit and take a bit off the upper flange of the covers in the Bridgeport since the valve cover upper flange is basically contacting the aluminum intake. This would allow the covers to move up on the heads a bit and hopefully between both mods I can get the required clearances. If not, the ccc covers are junk (pretty junk but still junk).
Trending Topics
Elder User
Joined: May 2012
Posts: 728
Likes: 2
From: North Idaho
I think that there will be. To complete the dyno, we put on a set of stamped steel oem (Vortec heads) covers. I plan to take the die grinder to carve out the spots a bit and take a bit off the upper flange of the covers in the Bridgeport since the valve cover upper flange is basically contacting the aluminum intake. This would allow the covers to move up on the heads a bit and hopefully between both mods I can get the required clearances. If not, the ccc covers are junk (pretty junk but still junk).
Gary
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Cargo Master
Joined: Apr 2005
Posts: 3,337
Likes: 165
From: Harpswell Maine
Gary,
Thanks for your reply. I will look at your suggestion as well. Right now I am installing portions of the interior. I have the cab in final paint and the cab rolled up on the firewall on top of a pad on the floor. It makes behind firewall padding, carpet and other behind dash work easier as well as doing the headliner. After that I need to final install and plumb up the chassis to final set the cab on the chassis.
Thanks for your reply. I will look at your suggestion as well. Right now I am installing portions of the interior. I have the cab in final paint and the cab rolled up on the firewall on top of a pad on the floor. It makes behind firewall padding, carpet and other behind dash work easier as well as doing the headliner. After that I need to final install and plumb up the chassis to final set the cab on the chassis.
Thread
Thread Starter
Forum
Replies
Last Post
Ecuri
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
9
Sep 19, 2003 06:04 PM
DeenHylton
Ford Inline Six, 200, 250, 4.9L / 300
10
May 2, 2001 10:29 AM