|
#1
|
|||
|
|||
More Holley tuning questions?
I got the 360 in my RamCharger running, and I am running the Holley truck avenger carb. The carb has a stumble off idle that I've been messing with.
Making the accelerator pump/jetting richer helps with the problem, but now the plugs are reading really rich with 70 jets and 0.035" nozzel, and black pump cam. I sort of disabled the secondaries for now, just so I can concentrate on the primary side. I installed two black springs and two brown springs (4 total) into the vacuum secondary to keep it from opening. Just a while ago I re-jetted the primaries to 66 jets and drilled the 0.035" accelerator pump nozzle to 0.041". It seems to be better, but I noticed my idle vacuum is lower than I thought , about 9"-10" with no load, and about 6"-7" idleing in gear? I need to re-check with a different vacuum gauge because the engine does not idle rough, and I have no problem with my vacuum brakes. Anyhow, if the vacuum gauge is correct should I install a 4.5" or 3.5" power valve? I forgot the formula on how to pick a power valve value. |
#2
|
|||
|
|||
You definitely need one lower than 6.5 imo.....
|
#3
|
|||
|
|||
I forgot to give advice on which one. I can't remember the recommended percentage, but if that vacuum reading is correct then go with the 4.5
|
#4
|
|||
|
|||
Thanks, I was thinking of using the 4.5" PV, I have extras of the 4.5" and 3.5"
so it's not like I have to buy it anyhow. Just need to mess with draining the fuel bowl and removing the metering block (again!) Anyone want to swap a Holley quick-change rear fuel bowl for a double pumper carb (from my old 850 cfm DP, before I went to the 1,000 cfm vac sec carb) for a front quick-change bowl? |
#5
|
|||
|
|||
Try the 4.5 PV with a 31 squirter and the pink cam.
|
#6
|
|||
|
|||
Well, I'm glad I checked my vacuum gauge! I hooked my miti-vac up to the vacuum gauge and found my vacuum gauge reading is about 50% low!
When my vacuum gauge reads 10" it's actually 15"! Anyhow, I think I will hold off on replacing the power valve untill I get a new vacuum gauge. |
#7
|
||||
|
||||
Holley recommends take the vacuum at idle (under load for automatics, they didn't say to put a load on manual transmissions) and divide by two. 11 Hg = 5.5 powervalve. If the number is even (say 5.0), go to the next lowest powervalve (in this case 4.5).
Terry |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
holley tuning help needed | lbk1956 | Performance Talk | 5 | 08-01-2004 01:31 PM |
Holley Carb Tuning | Xterminator | Performance Talk | 2 | 06-03-2003 11:29 AM |
Holley Jet Tuning | BELVEDERE2 | Performance Talk | 5 | 10-04-2002 12:19 AM |
holley 4160 tuning? | GLHS221 | Performance Talk | 2 | 07-27-2002 02:06 PM |
Tuning up your M1 for a Holley HP 4150? | tooomuch2 | Performance Talk | 0 | 06-02-2002 02:19 AM |