545, P-51, BT 2X4 Dyno Day - 460 Ford Forum
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post #1 of 20 (permalink) Old 04-16-2014, 02:31 PM Thread Starter
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545, P-51, BT 2X4 Dyno Day

Here's the build.
*************************************
545 CID
P-51's Out of the box, Springs for Hyd Roll.
Hyd Roller cam specked by Kaase
Blue Thunder dual quad intake with SCJ ports, out of the box
2 - 600cfm Holleys, progressive linkage, Vac secondary with diaphragms connected
2.25" into 4" headers
Forged internals, splayed center caps
10.5-1 CR
93 octane with a splash of 108

Best run was with 36deg total timing. Dyno owner says my secondaries are flooding when they come in. He recommended dropping a size or two on the metering plates, might be worth 10HP.
These numbers are not nearly as impressive as what you race guys post, but this is built to be a "low maintenance" street motor.
See attached charts. Run 3 was with 34deg timing, run 4 with 36. Run 5 was with 38 which was basically identical to run 4.
Thoughts????
Attached Images
File Type: jpg Dyno run 4 - 36deg_Page_1.jpg (92.7 KB, 262 views)
File Type: jpg Dyno run 4 - 36deg_Page_2.jpg (90.6 KB, 199 views)
File Type: jpg Dyno run graph overlay.jpg (94.2 KB, 204 views)
File Type: jpg 545 on dyno.jpg (94.4 KB, 220 views)

--Levi
545, P-51's, BT Dual-Quad

Last edited by BigBlockBehemoth; 03-05-2015 at 04:30 PM.
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post #2 of 20 (permalink) Old 04-16-2014, 04:03 PM Thread Starter
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For those who may not be able to view the attachments...
Peak Hp: 647 @ 5700
Peak Trq: 661 @ 3700 (Note that the pull starts at 3700 and the torque drops off from there, I assume it is higher at lower rpm).

--Levi
545, P-51's, BT Dual-Quad
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post #3 of 20 (permalink) Old 04-16-2014, 05:11 PM
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Nice build, anything done to that intake?

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post #4 of 20 (permalink) Old 04-16-2014, 07:54 PM
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Awesome! I don't think anyone is gonna poo-poo 650hp and torque. Least I wouldn't kick it outta my car.

Only question is this:
Couldn't you have gotten pretty much the same result using SCJ heads instead of P51's? perhaps picked up a lil on the lower end and saved a lil dinero?

just asking out of ignorance really.

Thanks!
Drew
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post #5 of 20 (permalink) Old 04-16-2014, 07:55 PM
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My Blue Thunder dual quad, dual plane (standard port) intake flowed around 260 CFM out of the box, with the upper runners flowing less than the lower runners. After the Mad Porter ported the manifold, it flowed around 315 CFM.
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post #6 of 20 (permalink) Old 04-16-2014, 08:26 PM
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Whats the cam specs?

Seems like to much timing.........28-30 is where the p-51 is best.

Headers too big IMO.

NICE build and thanks for sharing.

What rockers were used?
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post #7 of 20 (permalink) Old 04-17-2014, 07:45 AM
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Nice build you have there...similar numbers as my build....639 @5600 and 670lbs but a little higher up in the rpm 4400....also running p51 with a dual plane but single 850...not directed towards any one but some people frown on using p51 on a "lower" hp build..I know I got some SH!t when I posted my build...but hey.... it works and sets me up a little better when I TT this motor....I consider my motor and "odd ball" build as of now...and yours also.... but we make a little power so congrats on the build and numbers.

Edited: I pulled those numbers with 1 3/4 dyno headers... 2 1/4 is way to large. ....

Damn girl... You look better than a new set of mud tires
1993 f350 38's 5 speed. Toy

521 p51 headed pump gas street motor
639 hp at 5600 rpm
670 ft/lbs at 4300 rpm

Last edited by Imtruckinup; 04-17-2014 at 08:42 AM.
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post #8 of 20 (permalink) Old 04-17-2014, 08:43 AM Thread Starter
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Quote:
Originally Posted by BOSS 429 View Post
Nice build, anything done to that intake?
Thanks. Intake is untouched besides minor deburring.

--Levi
545, P-51's, BT Dual-Quad
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post #9 of 20 (permalink) Old 04-17-2014, 08:58 AM Thread Starter
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Quote:
Originally Posted by DeepRoots View Post
Awesome! I don't think anyone is gonna poo-poo 650hp and torque. Least I wouldn't kick it outta my car.

Only question is this:
Couldn't you have gotten pretty much the same result using SCJ heads instead of P51's? perhaps picked up a lil on the lower end and saved a lil dinero?

just asking out of ignorance really.

Thanks!
Drew
Thanks Drew. I'm sure you are right. Actually, the original plan was to use SCJ heads (at least it was 10 years ago when I started scraping these parts together!) but then the P51's came out and I decided to go ahead and buy big with plenty of room to grow.

Quote:
Originally Posted by DanE View Post
My Blue Thunder dual quad, dual plane (standard port) intake flowed around 260 CFM out of the box, with the upper runners flowing less than the lower runners. After the Mad Porter ported the manifold, it flowed around 315 CFM.
Thanks for the info Dan. That is a significant difference for sure. I knew that the intake would be the limiting factor in this build but I just wanted those dual carbs. I will definitely consider porting it when it comes apart in the future.

Quote:
Originally Posted by bob460 View Post
Whats the cam specs?

Seems like to much timing.........28-30 is where the p-51 is best.

Headers too big IMO.

NICE build and thanks for sharing.

What rockers were used?
Thanks Bob. I agree the timing seems to be too much, all I can say is the numbers don't lie. To be fair I never went that low but we started at 32 then increased by two until 38 for the successive pulls and every time the numbers got better. This leads me to believe that lower than 32 would only get worse?? Can anyone explain this? Everything I have read on this site agrees with Bob's statement about P51's and timing around 30.

--Levi
545, P-51's, BT Dual-Quad
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post #10 of 20 (permalink) Old 04-17-2014, 11:01 AM Thread Starter
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Quote:
Originally Posted by bob460 View Post
Whats the cam specs?

What rockers were used?
See attached for cam card.
Rockers are 1.73 ratio aluminum rollers and are made by an American company called Dove Manufacturing up in Ohio I think.
Attached Images
File Type: jpg Cam card_small.jpg (88.1 KB, 125 views)
File Type: jpg Rockers_small.JPG (96.0 KB, 72 views)

--Levi
545, P-51's, BT Dual-Quad
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post #11 of 20 (permalink) Old 04-17-2014, 11:39 AM
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Originally Posted by bob460 View Post
Seems like too much timing.........28-30 is where the p-51 is best.
I know that 28 figure gets tossed around a lot, but it's just not true. Ideal timing depends on a myriad of variables. Some engines need more timing that others, even when using the same cylinder head.

hi-jack aside.......NICE BUILD!


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post #12 of 20 (permalink) Old 04-17-2014, 11:42 AM Thread Starter
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Quote:
Originally Posted by bob460 View Post

Headers too big IMO.
Quote:
Originally Posted by Imtruckinup View Post

Edited: I pulled those numbers with 1 3/4 dyno headers... 2 1/4 is way to large. ....
Thanks for the feedback on this. I really was unsure of how big to go with these. I got a good price for a used set from someone on this site just to get me thru the dyno run. They are basically useless to me now. Probably should have just purchased the adapter plates and then I could have tried different sizes that the dyno shop had in-house (BBC).

--Levi
545, P-51's, BT Dual-Quad
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post #13 of 20 (permalink) Old 04-17-2014, 11:47 AM Thread Starter
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Quote:
Originally Posted by CarsByCarl View Post
I know that 28 figure gets tossed around a lot, but it's just not true. Ideal timing depends on a myriad of variables. Some engines need more timing that others, even when using the same cylinder head.

hi-jack aside.......NICE BUILD!


Thanks Carl. That makes me feel more confident about where I ended up.
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post #14 of 20 (permalink) Old 04-17-2014, 08:24 PM
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where was it dynoed...?
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post #15 of 20 (permalink) Old 04-18-2014, 01:54 PM
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Nice build!


How was the geometry with the HyRllr cam?
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