454 dynoed
 

New engine dynoed on tuesday, and the results are;

445hp@4600rpm - 447hp@5500rpm,
544ft/lbs@3500rpm w/over 500ft/lbs
from 2500rpm-4500rpm,

Very pleased to the results, considering, that cam
is very small; crane´s 278/290 0.529"/0.525".
Dyno run was made w/BG 750dp on RPM Q-jet manifold,
32` total advance at 3750rpm w/24´T-Bolt ignition box.
Question is; should I run w/750, or 850 carb, as it seems
that engine might use some more cfm`s,as the power
stays flat for almost 1000 rpm`s?

750 or 850?

Re: 454 dynoed
 

The 365hp 454 mag came stock with 750 cfm. I would say go with the 850

Re: 454 dynoed
 

800 that comes on the 500 hp's works great I have them, 505 hp at 5700...Merlin heads are a big help!

Re: 454 dynoed
 

What bore and compression are you at........Fred

Re: 454 dynoed
 

Pelle,
Reference your dyno sheet. If your manifold vacuum is greater than 1.0 IN/HG between 4800-5500 RPM it's a good indicator of an induction restriction. Make sure it was measured between the carburetor and the back of the intake valve.
Bob

Re: 454 dynoed
 

Spec`s are;

Blueprinted 454/330hp, now w/Eagle rotating kit, cast crank, I-beam rods, KB pistons, 9:1 CR, bore 4.280, Merlin 269cc heads w/2.30"&1.88"valves. Exhaust is Stainless Marine w/long SS risers. Rmbuilder, thank you for the tip

Re: 454 dynoed
 

RPM times cubic inches divided by 3456 = CFM. My motor is a 454 .030 over so it's 460 inches, it make its best power at 5000rpm, so 460 times 5000 = 2300000 divided by 3456 = 665.5 CFM at 100% volumetric efficiency. The 850 can't help you. My question is, is the carb a Qjet base like the RPM intake or is it square bore? If you have a square bor on an adapter on a Qjet intake, that's not good for volumetric efficiency.
Check out the Holley page link below...

http://www.holley.com/HiOctn/ProdLin...FMSC/FMSC.html

Re: 454 dynoed
 

The 750 is plenty of carb. The power is more than likely flattening out because of the limitations of the cam.

Re: 454 dynoed
 

It sounds like you have a smooth running, strong engine. If you want more power a larger cam and a x pattern intake would be on my list. However, that will make your engine a little more tempermental.

Re: 454 dynoed
 

Test run results

w/23"Mirage;58mph/5000rpm
w/24"Powertech 4-blade;61mph/4700rpm
w/26"Bravo One 4-blade;62,5mph/4700rpm
vs./stock 330 w/23"Mirage;53mph/4700rpm

So, it seems that it`s running right where it
should, with the power that it has?
445hp vs. 330hp? Test was run w/Garmin182GPS.
Suggestions to get 1-2mph more?

Pelle

Re: 454 dynoed
 

Pelle--My advice? When rmbuilder speaks-- Listen! It's good to hear from Bob again.--Lou

Re: 454 dynoed
 

"Suggestions to get 1-2mph more?"

Have your prop labbed. couled get you 150-200 more rpm.

Re: 454 dynoed
 

New dyno results, after few changes:

487hp@5400rpm
550ft/lbs@3300

Dyno test ran with Stainless Marine manifolds vs.
last year that was run with dyno headers. Other
changes: Crane -731 cam, Air-Gap intake & BG850dp
carb. Engine ran up to 4500rpm within last years
result and took it from there on. Considering exhaust
differences, headers vs. manifolds, I think it must be
10 to 20hp more all the way...?



New engine dynoed on tuesday, and the results are;

445hp@4600rpm - 447hp@5500rpm,
544ft/lbs@3500rpm w/over 500ft/lbs
from 2500rpm-4500rpm,

Very pleased to the results, considering, that cam
is very small; crane´s 278/290 0.529"/0.525".
Dyno run was made w/BG 750dp on RPM Q-jet manifold,
32` total advance at 3750rpm w/24´T-Bolt ignition box.
Question is; should I run w/750, or 850 carb, as it seems
that engine might use some more cfm`s,as the power
stays flat for almost 1000 rpm`s?

750 or 850?[/QUOTE]

Re: 454 dynoed
 

sounds like a great setup!!! interesting to see the changes you made since last year.....did you ever check the vac press as RMbuilder suggested? just wonder the outcome? as im considering the same thing.
kevin

Re: 454 dynoed
 

Pelle,

Nice work---congrats! For what you have done to your 330(s) you have gotten a pretty decent power gain. You can get more out of the engine(s), but for what you have so far, I certainly wouldn't be disappointed at all. Have fun!

Re: 454 dynoed
 

,merc 454 mag 365 horse came wiht 650 cfm carb, i run a 750 demon on a 454 mag wiht 475 horse, a 750 shoudl be enuf

Re: 454 dynoed
 

run better w 850...

Re: 454 dynoed
 

The weber's on 454mags were 750cfm carbs. Not sure on the Q jets.