Holley 850 dp

[69hemibeep]

I have a cam kit but but no sheet to explain the progression of each cam or hole. Does any one have one they can scan and post?

I was looking for the same thing earlier today...be nice to know the properties of each color...

Probably frightens you a little that we are on parallel wave lengths...

:jester:

Scares the crap out of me

 

[Hoosier Bird]

Gary, your jet spread is kinda backwards and small in the secondary....unless you have a secondary power valve.......then I am full of sh&t. But you already knew that.

It does have a secondary power valve.......and I don't think your full of crap.........

 

[Hoosier Bird]

Volume delivered for 10 strokes of the pump with a 50 cc pump

Pump cam position number 1
White 17cc
Blue 18cc
Red 18.5 cc
Orange 19cc
Black 19cc
Green 24cc
Pink 30cc
Brown 36cc

Pump cam position number 2
White 19.5cc
Blue 20cc
Red 20 cc
Orange 24.5 cc
Black 18 cc
Green 30 cc
Pink 37.5 cc


Rating of pump cams by fuel delivery over the first 30 to 40 degrees of throttle spindle from from the idle position. Pink is the least pump shot and yellow is the biggest pump shot.
1 - pink
2 - black
3 - red
4 - white
5 - green
6 - orange
7 - brown
8 - light blue
9- yellow

 

[dobie]

I checked my numbers. It's a 700 cfm DP carb. The only info I have is:

66 primary
76 secondary

 

[ACME A12]

Thanks Gary!

Now I've gotta print that...and put it somewhere that it won't get lost...safe just like all of the other stuff I have put away for safekeeping that I can't remember where I put them... Maybe I'll find those other poverty caps for Collin when I stash this list...

:jester:

 

[69hemibeep]

Thanks Gary

 

[mcmopar]

Great info Gary. I'll have to work on my 850DP now

 

[Hoosier Bird]

I guess I'm gonna have to put the 50cc pump on my primary. Still has a bad stumble just sitting in the garage running.... If I squirt fuel in the primarys while I throttle it, it has no stumble......Stay tuned....... :yesnod:

 

[Hoosier Bird]

Accelerator Pump Cams
#1 Hole Solid
#2 Hole Dashed

 

[Hoosier Bird]

More good Holley Info.........

Holley Accelerator Pump Cams
Capacity measured @ Degrees of Throttle Opening
Cam Position One____________________Cam Position Two
Color__Capacity__Degree__________Color___Capacity_ __Degree
White....17cc..........18°.....................Bla ck.....18 cc..........17°
Blue......18cc.........18.5°...................Whi te.....19.5 cc.......20°
Red...... 18.5 cc.....18.5°...................Red........20 cc.........20°
Orange..19 cc........19°......................Blue.......20 cc.........20.5°
Black.....19 cc........19°......................Orange..24.5 cc.......24.5°
Green.....24 cc.......23°......................Green....30 cc.........29°
Pink.......30 cc........30°.....................Pink.......37.5 cc......37°
Brown....36cc.........37°......................... ........................................

These figures were obtained as the summation of TEN tests with a 50cc accelerator pump lashed to 0.015" clearance (so divide each number by ten for the total volume of one shot).

Next up the vacuum secondary spring rate and when it opens the back barrels with a measured 90% volumetric efficiency on a spintron (reverse dyno).

Holley Vacuum Spring Chart
(Rated from weakest to strongest spring rate)
....................................Holley
Spring............................Part
Color__________________Number
White_________________ 38R-1195
Yellow_________________38R-585
Red___________________38R-552
Purple_________________38R-597
Pink___________________38R-1331
Green_________________38R-515
Orange________________38R-825
Plain (stock)____________38R-464
Brown_________________38R-477
Black__________________38R-684

With a model 3110 (780 cfm vacuum secondary 4150 Holley)
...................................SBC 350......................BBC 402
RPM.........................Tip open ...Full Open.... Tip open ...Full Open
Yellow
(Short Spring)............1620........5680...........1410 .........4960
Yellow........................1635........5750.... .......1420.........5020
Purple........................1915.........6950... ........1680.........6050
Plain...........................2240........8160.. ..........1960........7130
Brown ........................2710........8750.......... ...2380.......7650
Black ..........................2720........can't....... ......2390.......can't

 

[mcmopar]

This definitely needs to go into the tech section. Great stuff

 

[Hoosier Bird]

Put the 50cc pump and arm on the primary with the big black cam for 50cc only. Changed the primary squirter to #35 secondary is a #31. Jets are 82 primary, 84 secondary. Bog is totally gone without driving. Heading to a cruise-in. I'll let you know how it does. :yesnod:

 

[Hoosier Bird]

No bog what so ever........runs great through all rpm range. Timing is a little fast, need to back it off about 2 degrees.........runs great.

 

[mcmopar]

That's great You did a lot of work there and I personally plan to use some of that info when I go to play with my 850DP.

 

[69hemibeep]

Good to hear Gary, Now :drive: :drive: :drive:

 

[Hoosier Bird]

Now I need a good gear..........

 

[Basketcase]

that's great Gary whatcha runnin now? been thinkin about looking for a set of 3.55s like I had in Freebird. Like to try 3.91s, but they seemed a little steep for the highway.

 

[Hoosier Bird]

I think mine are 3.55, i want some 4.10s but I want to keep my 3.55s too.

 

[V269]

I borrowed an 800 dp from a guy that was not using it. Said I could use it long as I need. Tore it down Fri. evening and re-built it and cleaned it up. Put original size jets in ( 72 primary 76 secondary ) and 6.5 power valves. Also put 50 cc pumps on front and rear with stock 31 squirters front and back. Tuned with a vac gauge. Holy sheep s@&t. What a difference. No hesitation at all and this thing will fry the hides. Totally smokes the tires all the way through 1st untill you let off. Second gear it fries them and goes side ways for a good bit and pulls hard. So far it is all good. Will do some cruising to see if there is anything that needs attention. I am however still looking for a 750/800/850 dp of my own.

 

[Hoosier Bird]

I need to go down a few sizes on my jets. It's running rich. I think I'll put a 25 squirter in and then come up till stumble goes away. You only need enough squirter to make stumble go away in order to get best fuel economy. Car is loading up a little, I think I'll go down to about 76 and 78.