When it comes to tuning a Holley carburetor the power valve has always seemed a mystery to many. When you have a big cam and low vacuum you want the power valve to be lower than the idle vacuum, but not so low that it closes on the top end (high RPM). Symptoms of Wrong Power Valve Briefly Explains Fails/Blows out. The too-small value of a power valve is not a good thing either. Changing the Power valve. Here's the difference: If you are taking the vacuum reading in Park or Neutral you want to divide the reading by 2. Holley calls this a power valve circuit restrictor (PVCR). It was raining yesterday so I decided to start rebuilding my Holley 390 for my drawthru turbo 1600cc project.
If I decide to put in a 2. I had the boat since 05, and had a rebuild last summer. John tabor said:it doesnt make any difference what power valve is' found' in a 'new' holley or other brand carb. 0 and #44 jets (and gets be average of 20mpg).
As you noted you'd want it closed most of the time & to only open as you approach WOT & if there is a lean bog then go with a higher number. You have to test the power valve to determine whether it is blown or it is the wrong power valve. •Proper Drill Bit Size w/Stop. I can't imagine that the low compression ratio is causing your problems. Sold the car after 13+ years. How will you know that the power valve is wrong? I have a 318 w/ alumn. Selecting the correct power valve. The solution for your problem is to drill small holes in the primary and perhaps the secondary throttle plates to allow additional air into the engine. Choosing The Right Power Valve Size. Now measure your vacuum and install a power valve 1.
If it becomes too difficult after I replace the the PV, and she still farting, I guess I get to go pay my 125 hr and get her fixed right... After reading more tonight, what causes this? REALLY suggests that you have a valve that's not sealing (stuck open or bent), or an exhaust valve that is not opening (wiped lobe). I just got my 340 back together and have been running it for a few days now. And you definitely want all the odds in your favor in a race, don't you? What happens if my power valve is too big to be. I would have to agree.. The best throttle response and overall performance is to choose the power valve with the highest number that will not be open when the engine is at idle, in gear. At idle, there should never be any fuel coming out of the boosters. The added gas actually cools the combustion chamber.
I printed off a picture to show everyone and I feel they got the idea. Wish I had the monet to check dist., but it's an MSD billet and only a year old. Getting really bad gas mileage, would power valve cause it. You know that by comparing the reading you get from a test. I work @ Flowmaster here in Santa Rosa and we make great systems, but $=. That is, it requires vacuum to CLOSE it. Let's say that now our WOT AFR has shifted from 12. Proform main body & Quick Fuel metering blocks.
408 Pontiac, #62 heads, 274 XE cam, Eddy RPM intake, Quick Fuel Slayer 750, Carter Super Street fuel pump, Mallory Unilite, Turbo 400 with shift kit, Continental "Jim Hand Special" 3200 stall, 12 bolt 4. Va. beach, va. Has anyone had to run a 10. We'll admit that this might seem like a lot of work for a very small change, but let's dig a little deeper. It also seems that Holley does not list a 11/8"hg valve on their site, summit or Jegs doesn't have them either. We're these ready to run heads from Edelbrock? Originally started with 4. Thomas said:Anyone burn up a piston for running too low of a PV yet? What happens if my power valve is too big without. 73_RoadRunner||Performance Talk||9||07-03-2004 12:10 AM|.
Holley's seem to like to idle on the primary's only so your secondary idle screw should be closed off to zero. The main job of a power valve is to control the power that an engine delivers. 1969 Firebird "400". 80 at 123-125 Qtr Mile not jetted or timed right nning 34 degrees with 50/50 mix of 91 pump and VP 110 for a net of 100 Octane. 5 (with 7psi at idle). I apperciate everything.. Chris4x4gill2. What happens if my power valve is too big can you. So, make sure you get the correct size to avoid any issue and unnecessary high expenses that come with it. Ok, here is what I have: 327 with double hump heads, RPM Air Gap intake, 625 Road Demon, cam I have no idea but I am guessing it is pretty lobby. Jets are for metering and the need for a larger size will depend on the PV at higher RPMs. 89 SN) I talked at length with guys here and elsewhere about swapping ot the 6. I got it apart and installed my new 1. Location: BA, Argentina. How to correctly choose power valve?
8. any takes on why the vaccuum gauge needle bounces around like that? Lets take a look at what the power valve is, how to identify a bad one, and a couple of Holley power valvetuning tricks. The power valve on a Holley carburetor employs a technique that dates back to the earliest carburetors. A lean postion, bad fuel pump, or just a bad power valve? Thanks for the responce... Gary S. Joined: November-30-2006. Timing was bad but it's not up to you when your called. If something like this happens, you must check the power valve immediately. Car is an absolute dog on the bottom end now but carb spit back is a little better, seems to be most pronounced when 150* or below temp. But I guess I wont know until I pull it.
It exits through the windows and then enters the area where the PVCR are located. 42:1 add to that the overlap on the cam at low RPM and your probably trying to run that motor on about 6:1 compression at idle. The valve is held closed whenever sufficient engine vacuum is present. While instant feedback EFI does offer advantages, the power valve tuning session we just outlined between the primary main jets and the PVCR is exactly how you narrow down that margin between EFI and a well-prepared street carburetor.
5:1 at WOT throttle. Generally, the power valve circuit will introduce the rough equivalent of 6 to 8 jet sizes worth of additional fuel. For example, if your engine is cruising at light load at 10-12 ″Hg then the power valve will be closed. Once you have a proper reading, divide the vacuum reading number in half. But having stated this, hot rodders are inveterate tuners and may want to see if they can make their engine run even better.
Quick Fuel Technology also sells a billet aluminum metering block with screw-in 6-32 size bleeds that make these changes much easier. The #73 jet flows more fuel due to a modified entry angle. The higher in altitude the engine is working at, the lower the power valve rating needs to be, so that the valve doesnt open and enrichen the fuel mixture at to low a throttle opening. Have the front set up to come in fairly early and then have the rear come in late. 3) Remove the bowl (a tap w/ the HANDLE of a screwdrive maybe needed)with the bowl in your hand pump the accel pump lever (EASY) it should squirt a small amount of fuel that was in the pump, from the bowl. The most common Holley power valve is one that opens at 6. There's always Ebay........... # 24. It sounds like you may have a Holley carburetor with four idle mixture adjustment screws. Engine ran smooth but lumpy on the dyno. However, this has also reduced the total amount of fuel delivered to the engine.
However, the concept of reduced HP is nowadays outdated. Poor idling: The first thing you will notice if the power valve is wrong (value is too high) is the poor idling of your vehicle. Among them, the power valve is one of the important ones. 5 exhaust with Dynomax Ultraflos. When the PV opens, it allows additional fuel into the system. This will require some simple math. Rare LS-7 Crate Engine Finally Fired Up After Sitting in a GM Crate for 44 Years. Holley's web site says anything before 1992. 5 in there if that what is calls for..
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