Boost Referenced Power Valve
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- เผยแพร่เมื่อ 30 ส.ค. 2018
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Links to the products used in this video (affiliate)
BRPV (boost referenced powervalve) - Comes with everything needed to install.
simplestage.shop/products/brp... - ยานยนต์และพาหนะ
A+++ I am about to throw in the towel on blow through carbs. This video is GREAT!!!
I'm pretty sure I have the same BRPV. I'm VERY glad he made these available. I just put one in my home built blow through setup and was able to fix my lean tip in to boost on the primaries. Very tune-able and a very well made piece. Excellent video sir!
Ray Cam Thanks Ray! Yes these are a game changer
instaBlaster
CSU not only one who makes these , I got mine from a guy in australia. Work great .
Thanks man very helpful
Thanks for the video. Helps a ton
I want the drawing bigger so the veiwer can read the damn things
We have had success on our quick fuel blow thru 850 with a 2.5 power valve making About 1300 hp . We have some adjustable boost reference power valves from a guy out of austraila we are going to try.
Grates tipps!👍👍
this was a very good video I really enjoyed it
Man thanks for the info
Great video on this subject - thank you ! Does this only apply to a carb hat blog thru system ?
Hey Titan1500 How u doin this evening?? Just had a quick question! On the metering block at the top,the for holes and pin Do i block those off as well ? .im jus about done w the rebuild modified carb..Thanks again for your awesome vids bro!
Grate video tanks...
Well I'll be dammed. I think i finally get it. You are boosting the float bowl and making the much larger PV adjustable as to when it opens under boost. Kind of opposite a draw thru boosted carb. Staged PV's is something I never knew about either. Are other other types of carbs that are compatible with blow thur?
I hope you are still out there, this is worth a subscription.
Good video
Cool video. Are you going to do another on squaring the carb?
havablast70 , I can put it on the list thanks for the suggestion!
Hey,i generally never ask anyone questions on here,but ive built alot of blow through carb combos an im curious if u have ever seen fuel pressure effect the boost pv before the bowls r pressurized by boost,say ur valve is set to open at 3 psi but u have 7 psi of fuel pressure pushing against it,have u had the valve open prematurely,i set em with compressed air and they usually come off the seat around 2 psi and flutter then by say 6 they r wide open,so i add a couple turns to try and compensate for fuel pressure so they flutter at 5 psi and r fully open by 10 give or take,just curious if u have seen the same things and set em up accordingly....justin
Ok, finally a video on blow thru street applications! I'm considering a blow thru for my 94F150 flareside! I'm talking 200-300 miles a month! Got a a powershot, and maybe that's what I need to stick with! But a 10lb turbo setup would be awesome! Blow thru, but dependable! How bout a vacuum power valve in the front, boost reference valve in the back?
Many guys do that
@@tittan1500 thanks, I used to race 3-4 times a week! Everyone was shooting gas then! I'm 62 now! I'd don't want to go back to serious drag racing, but wanna be respectable with the new 500+ factory rides! Retired now, and would like to hit the small tracks just to watch. But if the itch comes, a pass or 2 won't really be racing, but it has to come home under its own power! Just good old boys having fun! Getting old sucks! Get ur thrills now!
at what power level would i need more mods to a regular NA carb then removin the chocke horn and swapping to solid floats when building a 350-400 hp 231cid v6 for street driving with a 5 speed manual?
So I'm trying to make 500-650 on a boosted 1st gen 327. Any tips on what i could do to my non blow through carb to help with making about 10-13 lbs on a carb
Hey Titan, Do you expose the transfer slot in the secondaries and primaries or just the primaries?
saintblamo generally set them like little squares. Primary is most importiant
So did you run 2 tiny screws into the 2 holes that you tapped ? I'm trying to figure out the minimal of what I need to do to run around 8-10 psi on a pretty stock 5 speed fox body that I drive a shit ton on the street and see's little to no track time.
You should make a video on building the most basic but functional blow through convertion for a lower HP say 500 HP convertion. There are slim to na video's of convertion's period but, the one's I have found are for dedicated track carb's. I know I need to pull the choke and mill it. I have access to either a Holley or Edelbrock 650 doubles. Great video's btw, love the knowledge.
Bryan Roupe yes sir I put cap screws in the hole ( link to them in the video description).
Honestly for 5/10 lbs you don’t need one. It will help if you roll on the throttle mid way a lot but at the lower post levels the standard powervalve can cover the gap pretty well
Hi , can this be done to holey 2300 2bbl to make it blow trough ?
So are brpv's needed for a blow thru 7.5psi if you use a boost reference fuel pressure regulator with a Holley 4150?
Yes
Thank you , But were you drill & tap what go`s there a plug or what some how I missed that part
Building a blowthrough video #3 shows exactly what to do. This video was not clear in that area
Should I do the jet exstentions and the copper tubing on the pv even if I'm not doing the bapv? Only 10psi.
Bryan Roupe always run jet extensions on the rear main jets unless the carb is sideways in the car
Normal power valves cannot be extended
Did you mod your own carb for boost or is this a carb you bought
Justin Molina I purchased this one as a blow through. But over time as power increased I handed the BRPV and Annular boosters / bowl vent extensions
Doing blow thru Novi Paxton set up on ls 5.7. what size boost power valve should I buy? Going with a 750 I think, only 10 pounds of boost max
Charlie B currently the SCS power valve is just one size, you adjust the flow with the PVCR
I have a question.I have a ls and while on brake I watch my a/f and around 4-5 psi I it will go from .70 to .62 so im assuming the power vavle is opening.It basically kills the engine for the most part and cant really come up on the transbrake.Should I tighten the power valve in the front or both or something else.Its on cam only twin 63s..thanks so much for any info
Tighten it up or use smaller PVCR on the primary and more on the secondary
that works for a rotary mazda to holly
Im building a twin turbo 5.3 and am using a 750 dominator. Its a typical 3 circuit carb but the fuel channels are a little different. Can you shed some light on this carb
I don’t have any experience with the 3 circuit. The concepts are the same you just have another fuel source to balance
@@tittan1500 Ok. I was wrong. The 750s are 2 circuit. My bad.
If running a normal power valve, you shouldn't need to do any modifications to the PV, other than increase the channel sizes for more fuel.. right? With your BRPV system, you block off the vacuum hole, how does boost pressure get INTO the BOWL side to open your BRPV? The boost then squishes the ball open from boost entering through the vent tubes?
Correct
If you don’t block off the hole pressure in the intake can equalize on both sides of the ball and cause it not to open
Hey I love the video. But just curious though is that like 100% all I have to do to a carb to make it work with boost?
Hey , Depending on what carb you start with you may need to do a little more.
if your starting with a double pumper style carb - Nitrophyl Floats - .120 needle and seats ( not required )- Epoxy to seal up the main well plugs ( not required) - Lots of guys like annular boosters ( not required)
If your carb has a power valve check ball kit remove it
Sweet got it thank you. I actually have a 85 fox with a 302 with speed pro pistons and an Edelbrock intake with aluminum heads and a 750 double pump Holley carb. And I’m thinking of either nitrous or turbo. And I’ve been strongly looking into on3 turbo then the problem with a blow threw carb came up and the price for a blow threw I can go efi. But I like being able to tune my own stuff. So while we are on the topic what types of floats will I have to use and is it possible to run e85 with this blow threw carb mod? If not how much more will I have to do?
Sierra Ray how much power do you wanna make ? I am bias blow through are amazing with the cooling and to me they are easy.
Pickup a BRPV and a wide band and. Go for it. It’s simple stuff and no intercooler required !
Shameless plug we just started selling power valves.
Www.simplestage.shop
hey hows it going! i kno your very busy. i had few more questions.i have a aeromotive boost ref fuel pres. regulator. can i use it for the 500cfm carb blow thru ?? also i ran 24lbs of boost w the efi set up .whats a good fuel pressure for the carb ?? ..did lots of research but no clear answer. ty for your time titan!
Les Harp as long as it’s a carb regulator and can Regulate down to 7 ish psi. Then you should be good
Tittan1500 ty for your knowledge and for sharing it w me I really appreciate it bro..Salute!💪🏿💯
Hey titan1500! i saw where u drilled and plugged the vacuum hole ..i have the holley 2 bbl so i do the same to the primary? also u tapped the hole .but i never saw what u plugged it with. underneath the carb plate i have a ball in the hole do i drill it out or i can leave it?Sorry bro this is my first time w a carb. thx for all your help!
Les Harp sorry there is a link to the set screws I used to plug yhem
Tittan1500 i appreciate the vids fasho ty bro👍
Can you run the Percy's adjust a jet blocks with a blow threw carb
Shane Mcclaran I have never ran them I assume you could
I have a 2.3l ford mustang w turbo ..thinking about blowthru carb...what size cfm carb would i need and will i need a boost ref. Valve also for a 2bbl holley??
Les Harp ya a 500 ish 2 barrel with a BRPV would be a good start with some vent tube extensions.
@@tittan1500 wow thx .love the channel .u really are easy to understand in your breakdowns bro!..i love racin..my combo is simple
Worked iron head ported n polished..436.lift hydr.rollercam 114 lsa..6500rpmrange.
Msd dig 6 plus .w locked out distributor. C-4 rev.valve body .3500stall. 410gear. 62-1 ar70 turbo. Jus tryin somethin new.
What fuel pressure regulator do you use for the ethanol?
Tittan1500 It doesn’t look like its boost referenced? Does your fuel pressure stay the same no matter what the load on the engine is?
Thomas Traicoff sorry MP-9833-B
Tittan1500 Awesome thank you🙏🏼 Easily my favorite build on youtube
I need the Bowl e85 double needle
So 8 PSI of fuel goes in the carburetor but let's say you're pushing 10 psi of boost wouldn't it push the fuel backwards? is there something you do to stop this
Pressure from the boost fills the bowls through the vents so you always have more pressure “on the fuel” than after the booster
Sorry I forgot to mention that it is super charged
You didnt show the plugging of the holes you drilled in the throttle base plate....
Living Room Pickers Club oops
Does anyone know, if I run a normal vacuum power valve with the boost power valve. Would I still plug the base vacuum port that references the normal power valve?
Tony yes you can just don’t plug the port on the vacuum side
@@tittan1500 Thank you very much for the reply. Your videos are so useful and full of information regarding blow through carba. Thank you for making them.
How about can cancelling second ay PV and jet up the secondary jets?
GHT RCP ya you can do that, but the curve will not be as linear.
In some cases the main jet at its max size is the restriction depending on main well and booster size. In this case eliminating the PV circuit can lower total fueling
Do i need 2 power valves to do. 5.3 small cam e85 at 10psi ??
Prob just 1
What's the # for that float with 3 notches?
Dunecoones www.amazon.com/Holley-116-10-Notched-Float-Extension/dp/B00029J5CS
What fuel pump are you using ?
cory cook ProStar500
How to you get the fuel pressure high enough to run that much boost ?? I can’t run anymore than 18psi with the same pump?
cory cook crank your bypass all the way down it will do mid 30s
Thank you. I will try and see what happens.
Plug the power valves altogether. Add a boost referenced fuel pressure regulator and fuel pump capable of providing 20 lbs more than the boost pressure. Up your jet sizes 4 or more sizes and possibly put smaller air bleeds to increase fuel flow at higher engine speeds. Noone seems to address the problem of insufficient fuel flow and pressure. The needle and seats must be the largest you can get or maybe drilled out a bit ,Use the plastic floats they won't collapse. For alcohol consider spraying additional fuel into the boosters like fuel injection.
dielauwen Everyone uses boost referenced fuel regs these days man. Stock bowls on e85 can get you to around 700 wheel and dual needle and seat bowls are on the market that support more than most people can afford.
On a blow though deal making any power just squaring the jets and blocking power valves is a good way to buy a bunch of pistons.
Sorry man but that is terrible advice
Most Racing carbs do not use power valves. Holley still does. There are no Motorcycle carbs that have power valves that I know of. Just jet for best power . So why do you say it is bad?
And to create high power under boost the airflow needs to be much greater so Carb size needs to be increased. It becomes a choke .They are not designed for the flow alcohol needs so just add squirters for high boost.
dielauwen these are not naturally aspirated motors. Air flow in a turbo motor is not a linear deal.
In automotive carbs power valves on street / race cars are most common. This lets you drive clean and maintain safe AFR at different loads.
Boost makes this even more critical, when your part throttle and the boost comes in your going to go very lean if you don’t have compensation.
Drag cars sure you can roll just big square jets, just don’t expect it to street worth a dam or peddle the car.
I see you have not worked on foreign cars which have no power valves on the carburetors.
It is simple to set the carb to follow a set mixture for any given speed, load is not even considered. Small engines need to make power at any rpm. You can set it to be lean anywhere on the scale or rich anywhere on the scale.Or correct mixture for least emissions.
If you are looking at gas mileage why did you build such an engine? To get a better mixure under pressure you need a much larger carb to flow the air in a more linear range.
Put a 1050 Dominator on your engine and see how it does.
dielauwen ok man 😂