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How much horsepower can be made with an 850 cfm Holley DP?
December 8 2005 at 10:00 PM
No score for this post Greg H (Login gregh429)
from IP address 128.227.41.93

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A buddy of mine is convinced that they can't make over 550 hp. Does anyone have proof otherwise? I need dyno numbers he is not easily convinced.

Greg

This message has been edited by gregh429 from IP address 128.227.41.93 on Dec 8, 2005 10:00 PM




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Mark Miller
(Login BLUEOVALRACER)
64.12.117.9 I think your Buddy is wrong,in a old Car Craft Magazine>>>
No score for this post December 9 2005, 12:33 AM

they tested a 460 FMS Crate engine with the Aluminum Cj heads.They made 577.6 hp at 6,400 rpm with a 850DP with stock jetting.

Later Mark.

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DaveMcLain
(Login DaveMcLain)
216.229.65.149 850cfm and Horsepower
No score for this post December 9 2005, 8:15 AM

My carburetor guy says that some of his customers are making over 585 horsepower out of a 9:1 compression 355 running a 390cfm Holley, what does that tell you? I can build a 355 cubic inch engine that makes 400 horsepower from a 4412 500 two barrel. A 500 two barrel is 40% smaller than a 500 4 barrel would be(they are rated differently) and they are actually 1/2 of a 750 carburetor.

I see no reason what so ever why an 850 wouldn't easily be able to make over 600 horsepower quite easily, why not?



This message has been edited by DaveMcLain from IP address 64.251.142.163 on Dec 9, 2005 9:24 AM




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LivermoreDave
(Login LivermoreDave)
70.157.111.38 1 hp. per cfm...............
No score for this post December 9 2005, 8:24 AM

...... well, that's a good as a guess as anyone's!

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Jim W
(Login JimW545)
12.35.147.198 I'm making over 600
No score for this post December 9 2005, 9:28 AM

463rwhp, nearly 117 in the 1/4 at over 4000 pounds
This from a full exhaust street 545 with an out of the box Speed Demon 850 DP...

Jim











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Mike_R
(Login Mike_R_SCJ)
65.198.133.72 How much...
No score for this post December 9 2005, 12:04 PM

I believe when Edlebrock was developing the Victor intake they tested it with an 850 and it put out right around 700 hp. But I'm not sure if the carb was modified or anything.

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Sheldon G
(Login STR-LGL-70)
205.188.117.68 850 holley
No score for this post December 9 2005, 3:21 PM

Don't know how much hp but mine went 10.63 at 127 + mph. 3000# and poor combination. only 9.6.1 compression with 266/[email protected] cam duration. Only 125# cranking compression!
Sheldon G.

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Doug
(Login XEngr)
68.251.198.156 Dyno sheet
No score for this post December 9 2005, 5:23 PM

I saw a dyno sheet of a 429 that made over 600 HP at the rear wheels (manual transmission) using a 850 cfm Holley.

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Jason Pierce
(Login jpierce55)
172.143.209.252 Re: How much horsepower can be made with an 850 cfm Holley DP?
No score for this post December 9 2005, 6:23 PM

It is just theory here. I ran some numbers through my dyno software and it shows 850 being good for a touch over 1000hp with the right combo. RPM to CID ratio appears to be the big factor here, that is to say an efficient engine needs less carb per hp. That makes sense.

In anycase I have seen a supposed appr. 600hp engine with an 850.

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