455 Dyno'd today & I am horrified!!

Hey everyone. So after months of waiting, the wife & I went to see the motor get dyno'd today. Was warm & ready when we got there. Did 4 pulls & HP came out to 140ish torque to 240ish!! Those numbers are those numbers are not good(obviously).

I was told that this was just the break-in for the cam & they usually do 15-20 pulls to get it all tuned correctly. Said we were at around 26* of timing. Told them Buicks like 32*-36*. Said as they break it in they slowly(for ring seating, etc.) then advance the timing slowly until it makes no more power.

Here's my set-up:
1973 block(Machined .030 over)
Stock balanced crank
1970 heads(Stage 1 valves)
Told close to 10:1 compression
Stock intake
Stock exhaust manifolds
TA 284-88H camshaft
Machine shop got springs(said TA Stage 1 springs were too close to coil bind)
Forged dish pistons(TA 1621A-.030)
Forged rods(TA 1633C)
Hydraulic lifters(TA 1405)
TA balancer(TA 2026) & flex plate(TA 2030)
.005 double roller timing chain(TA 1524A)
5/8" oil pick-up tube
Stage 1 fuel pump(TA 1534B)
Steel rocker arms(TA 1317)
TA timing cover(TA 1533A)
NGK 6630(UR4) spark plugs
Taylor Spiro-Pro 8MM wires
Carburetor & distributor set-up by Ken at Everyday Performance
TA water pump(TA 1537-HP)
Front gallery screw in plugs
Lifter gallery clean-up
Main oil gallery chamfer

From my experience it doesn't seem to be a part issue as much as it may be a set-up issue. Not sure if the timing chain isn't aligned right, if all four carburetor barrels are opening fully, or something of that nature.

I know there is no way these numbers should be where they're at. What is your guys take? What are decent or realistic dyno numbers for my set-up?

Sorry if I missed any details I'm still in shock here. Let me know if you need any other details.

Thanks,

Kyle

 

When the timing is brought up to 32*/34* things will look better. There's a lot of guys on here a lot more experienced but I would guess you should be about 400-450 hp and 450-500 tq. Do you know what cc your chambers are? How far your piston is in the hole? What's the compressed thickness of your head gasket?

 

Should be 66cc I believe for the heads. Should be pretty close to 0 deck. Gasket thickness I do not know. Shop got the Fel-Pro gaskets.

Pistons were sitting .050 in the hole before milling of heads & block.

Kyle

 

There definitely should be more left in the motor 26 total timing deafly left some horses on the table Anything over 30° the motor should come alive double your current numbers in horse power and torque give or take that's probably really where it is. You never want to Dyno a fresh motor 20 times unless it's a test mule.

 

I wouldn't expect over 400,..essentially it's a stock 70 stage 1 setup they were good for around 385 to 395hp

 

I agree with hugger. Thats what Im expecting with my build which is basically the same..
Basic difference.
basically a TA_288-92H camshaft
stock valves.
ported heads
other stupid parts that dont mean much.

 

I just got a bit worried. Thought we were at the final stages. Turns out today was just a break in day, I saw those numbers & was horrified.

Hopefully it's just a timing issue & not a set-up issue.

TA claims a 25 hp gain over stock cam with the 284-88H cam so that should be pretty close to 400 hp. More interested in torque numbers myself.

Kyle

 

I might of gone a little high on the 20 number. I know they're just trying to get the best tune out of it.

Kyle

 

I'd be okay with that. Can always change headers & things in the future.

What do you think a torque estimate would be?

Kyle

 

Something is definitely wrong? 26* timing is ridiculous? Sounds like they are jacking you around to me.

 

Can I ask you how much they charged for the Dyno break-in of the engine ?

 

26* for the break in. Then they'll start advancing the timing until it stops making power.

Kyle

 

Sure. $800.

Kyle

 

Really no reason to start at 26° thats LS1 timing ,..was it smooth??? For that poor of a # the engine is hurt, plug wires crossed, the spring has come off the secondary throttle shaft, or ??? But a few degrees of timing isn't going to unlock another 100hp

I'd be expecting 450 to 500 ftlbs

 

Didn't sound un-smooth. Little hesitant on start up. Asked them when I saw the numbers & they said the 26* was for break in(to help seat rings). They would slowly start advancing the timing until it made the most power over the rest of the weekend.

Come to think of it the carb was separate when I bought the motor & until you brought it up, I never even thought about the spring. Could it be that the secondaries weren't opening? The dyno had a cable hooked up the the throttle shaft.

Kyle

 

Engine or chassis Dyno?

 

Engine dyno.

Kyle

 

Larry,

They took it to 5k.

Hugger really has me wondering that throttle return spring.

Kyle

 

It's on the secondary shaft, there at the bottom I have had a couple somehow come off the shaft and obviously they wont open, easy enough to check may get lucky,...

No need for a return spring on the dyno,...also if the gasket is catching the butterflies, the arm will continue to go back but not open the butterflies