Guess the HP!

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petethekiller

petethekiller

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Hey all!

My 440 is about to hit the Dyno and i would love to hear your guesses on how much power this is gonna make.

Here is the build:
.030 440, Stock stroke
Fully balanced rotating assembly and studs
Hughes engines Solid Flat Tappet 250/254 cam .620/.640 gross lift with 1.6 roller rockers
Well ported ProMaxx heads Flow bench said 309 at .600 lift, combustion chambers milled to 76cc
Gasket matched and deburred Trick Flow Track Heat Intake
11.3:1 compression
Proform 850cfm carb
MSD Dizzy

whats your guess

440 dyno.jpg
 
Guess at 565? Is that carb going to be big enough. I built the same basic motor with a few years ago with a little more cam and ended up needing a 950 carb.
 
It'll be under 600HP, because it's carburetor limited. That engine would suck down an 1150 Dominator sittin on top of an intake with a Dominator flange, instead of being choked with a 4150 size flange and a "small" carburetor. Having said that, It'll still make good power. Just know you can add what I would call "a good bit" more with a Dominator intake and carburetor. Just one peon's opinion.
 
My 440 is about to hit the Dyno
Click to expand...

Looks like it’s already on the dyno.

Whatever the numbers are on the dyno sheet, just understand that testing that same combo on a different dyno could yield numbers that are +/-50hp.

The few times I’ve tested a BBM with fender well headers(What they appear to be in the pic), the top end of the curve fell off earlier than what was expected based on the rest of the combo.

On the dyno here, I’d be looking for something in the 575hp range.
Could easily be over 600 with normal 2 x 3.5 headers, and more cam duration.
 
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My guess it will make 569 HP at 5600 rpm and
610 ft lbs at 4500ish rpm.
 
PRH said:
Looks like it’s already on the dyno.

Whatever the numbers are on the dyno sheet, just understand that testing that same combo on a different dyno could yield numbers that are +/-50hp.

The few times I’ve tested a BBM with fender well headers(What they appear to be in the pic), the top end up the curve fell off earlier than what was expected based on the rest of the combo.

On the dyno here, I’d be looking for something in the 575hp range.
Could easily be over 600 with normal 2 x 3.5 headers, and more cam duration.
Click to expand...
I'll have to check my Dyno sheets but I think my 2 1/8 tti headers picked up 26 HP at peak over the fenderwell headers and peak rose 200 rpm but power was up everywhere.
 
petethekiller said:
Hey all!

My 440 is about to hit the Dyno and i would love to hear your guesses on how much power this is gonna make.

Here is the build:
.030 440, Stock stroke
Fully balanced rotating assembly and studs
Hughes engines Solid Flat Tappet 250/254 cam .620/.640 gross lift with 1.6 roller rockers
Well ported ProMaxx heads Flow bench said 309 at .600 lift, combustion chambers milled to 76cc
Gasket matched and deburred Trick Flow Track Heat Intake
11.3:1 compression
Proform 850cfm carb
MSD Dizzy

whats your guess

View attachment 1716168318
Click to expand...
Is this a street/strip deal ?
 
The motor is going in a 72 Duster with mini tubs and Caltracs... Street/strip car.

I'm hoping for 10.90s on motor but I might be overly optimistic. I'm running TTI 2 inch headers on the car. I didn't have them on hand at the time we bolted the motor to the dyno.

The first was today but isn't very promising..... pulled 487hp, it was done making power at 5300 rpm so something needs looked at.

20230327_170428.jpg


20230302_175517.jpg
 
Post up a dyno sheet.
Not the graph, but a sheet with some data on it.

487hp from that combo is way low.

On the dyno here:
Flat top 446, untouched ootb RPM’s, xs282s cam, 1.5’s, SD/850, 1-7/8 x 3 headers……makes right at 500hp.

My first thought is…….it appears to be a vacuum secondary carb.
Maybe it’s not fully opening on the rear.
If the dyno shop has a decent DP on hand……. Try that.
 
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petethekiller said:
The motor is going in a 72 Duster with mini tubs and Caltracs... Street/strip car.

I'm hoping for 10.90s on motor but I might be overly optimistic. I'm running TTI 2 inch headers on the car. I didn't have them on hand at the time we bolted the motor to the dyno.

The first was today but isn't very promising..... pulled 487hp, it was done making power at 5300 rpm so something needs looked at.

View attachment 1716168361

View attachment 1716168362
Click to expand...
Yeah, don't get to down on it. My 1st pull with my new 470 showed 601 but 684 ended up being the most common number, I'm sure there's plenty left in it. Like PRH said post the sheets.
There's lots of smart people that can help
 
I do t have the Dyno print outs yet.... I requested they bolt up the 950 dyno carb. Hopefully more pulls tomorrow, the firsts pull was at 32 degrees of timing.
 
petethekiller said:
Initial at 20 degrees, 32 degrees at 2300 rpm
Click to expand...
That sounds like a lot at 2300, my engine was 22 at 2500. My distributor was advancing way to fast so we put a super slow curve into it.
It helped it carry power longer.
Also I think your engine is going to love the 950, that's a much better wot carb
 
The torque numbers looked pretty decent... from 2800 up was over 490 lbs of torque max tq was 5200 at 545ft lbs
Click to expand...

This is why you/we need to see some data.
545tq@5200 = 539hp at that rpm
It appears the 487hp number isn’t the “peak”.

On an engine dyno, torque is measured.
Hp is calculated.
In order to have 487hp@5300rpm, the tq number at that rpm would be 482.
It’s highly unlikely the engine TQ numbers dropped from 545@5200………down to 482@5300.
 
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So, to this point it would appear the number is at least 539hp@5200.
Not too far off the estimates that were in the 560-580 range.

Whenever the hp peak happens “too low” in the curve, I’m usually suspicious of the valve spring situation.

Do you know what springs are on the heads, and at what installed height?

That thing should be able to hang on to around 6k before the hp starts dropping off.

If the TQ peak is indeed happening at 5200………that’s promising for getting the hp numbers to come up some.

To speculate a bit…….
If it lost about 40ft/lbs by 6000rpm(545@5200 down to 505@6000), you’d end up with 576hp.
If it happened by 5800, you’d get 557hp.
By 5700, 548hp.

Assuming the TQ peak is actually occurring in the 5200 range…….in order to lose 40ft/lbs from 5200 to 5700…….. “something” would have to be pretty unhappy.
 
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petethekiller said:
Folks Machine in Norman Oklahoma
Click to expand...

The reason I asked is, I have a customer down that way that had an engine tested at Dyno Services of Oklahoma…….and the numbers seemed in line for his build.

Just wondered if it might have been the same shop. Apparently not.
 
Unless those 8005A’s are installed at way too tall of a height, they shouldn’t be the thing holding you back.

More dyno pulls today?
 
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