Holley Jetting - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 09-28-2004, 19:17   #1 (permalink)
Registered User
 
clevoxt's Avatar
 
Join Date: Sep 2004
Location: Brisbane
Age: 37
Posts: 47
Holley Jetting

Need some advice on jets and power valve sizes for my 600vs holley,or would i benefit more from say a 650dp.My specs are,
Cam-@50 219/219 525/525
Manifold-performer
Ignition-procomp
Exhaust-extractors,twin 21/2
Heads-std
Trans-c10
Diff-3.50 gears
clevoxt is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-29-2004, 00:44   #2 (permalink)
74 XB Fairmont
 
brenx's Avatar
 
Join Date: Sep 2001
Location: Cranbourne, Vic
Posts: 5,113
Re: Holley Jetting

I think it very borderline 650dp. My mates 302 doesn't have much more cam than that yet runs a 650DP.

Brenden
__________________
XB Fairmont (street car) 11.07@123.02mph.
brenx is offline   Reply With Quote
Old 10-03-2004, 01:58   #3 (permalink)
Registered User
 
Racer's Avatar
 
Join Date: Oct 2002
Location: Sydney
Posts: 992
Re: Holley Jetting

Jetting is one of the least understood things. The jetting should initially match the carby. The carb should be jetted to to give the right balance of air/fuel for the paticular carb size (CFM). Jetting is merely to fine tune the whole engine assembly as one. If you need to change more than say 4 jet sizes, something is wrong with the carby, or the carby is the wrong size for the engine.

Contrary to popular belief, a engine with an oversized carby may need larger jets, and an undersized carby may need smaller. This is the reverse to what most people think. The reason is that an undersized carby has a stronger signal on the boosters and pulls more fuel. The reverse is true of an oversized carby.

Get the list number off the choke housing and go to the Holley site and put the baseline jetting back in it. A 600 should be fine. The standard GT351 carby is smaller than that.
Racer is offline   Reply With Quote
Old 01-09-2005, 13:15   #4 (permalink)
Registered User
 
Join Date: Nov 2004
Location: Wollongong
Age: 31
Posts: 67
Re: Holley Jetting

I'm running a 650 vac sec on a near standard 351 and it works a treat. All i have is a mild cam and twin 2 1/4 exhausts.
XECLEVO is offline   Reply With Quote
Old 01-09-2005, 13:48   #5 (permalink)
Registered User
 
northiam's Avatar
 
Join Date: Feb 2004
Location: Victoria. Australia
Posts: 381
Re: Holley Jetting

Your idle vac would be 15+ inches with that mild setup so a standard 6.5 pv would be sweet. Jetting would be also very close as your carb size is good too.
northiam is offline   Reply With Quote
Old 01-10-2005, 15:43   #6 (permalink)
Slurry Boostin
 
TTNOS8's Avatar
 
Join Date: May 2003
Location: Lake Entrant, near Bendale
Age: 32
Posts: 1,211
Re: Holley Jetting

northiam, I doubt idle vacuum would be that high.

clevoxt, If you want to see what is best and you've got time and tools to play around then try both.

Get your timing right, idle mixtures right, and run your engine up to oper temp. auto or manual?

Put a vacuum gauge on the engine and read the idle vacuum.

record reading and fit power valves up to around 2 inches lower than reading.

fit air/fuel ratio meter to engine, monitor all readings throughout rpm range under different load situations and jet, adjust carb, timing, etc to suit.

I usually try and get a/f to around the 13.2 mark under power.

Or spend around $120 and take to a dyno shop
__________________
All Go, No Show
XE, 351C, Nitrous, 337rwkw
XW GS, Silver Fox, 302W
VS 215i Senator *For Sale*
TTNOS8 is offline   Reply With Quote
Old 01-11-2005, 03:15   #7 (permalink)
Registered User
 
northiam's Avatar
 
Join Date: Feb 2004
Location: Victoria. Australia
Posts: 381
Re: Holley Jetting

Quote:
Originally Posted by TTNOS8
northiam, I doubt idle vacuum would be that high.

clevoxt, If you want to see what is best and you've got time and tools to play around then try both.

Get your timing right, idle mixtures right, and run your engine up to oper temp. auto or manual?

Put a vacuum gauge on the engine and read the idle vacuum.

record reading and fit power valves up to around 2 inches lower than reading.

fit air/fuel ratio meter to engine, monitor all readings throughout rpm range under different load situations and jet, adjust carb, timing, etc to suit.

I usually try and get a/f to around the 13.2 mark under power.

Or spend around $120 and take to a dyno shop
My F238 with a performer manifold run at 11 inch of vaccum! My old XC 351 with a 214-219@0.050 run @ 17inches. I reckon it will be close!
northiam is offline   Reply With Quote
Old 01-12-2005, 00:49   #8 (permalink)
Nod
Registered User
 
Nod's Avatar
 
Join Date: Aug 2003
Location: Perth
Age: 41
Posts: 119
Re: Holley Jetting

I must have a problem, I run a 208-208@.50 and get 14inches :(
Nod is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Holley types? 347 Windsor Tech 4 02-17-2005 18:52
390 or 350 Holley XF__UTE Inline 6 Tech 7 07-29-2004 10:03
Any1 done 500 holley onto xflow? fordmuscle_83 Inline 6 Tech 0 03-21-2004 15:54
holley help qwikcorty Cleveland Tech 16 06-30-2003 04:22
holley rebuild qwikcorty Cleveland Tech 0 06-21-2003 22:12

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 04:04.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.