I feel like a mathematician after watching this! Simple math really, but knowing the equation is the key. Love how you stayed a cool cat being asked the same question 96million times, keep up the good work!🍻

Best video I've seen explaining injectors

Love the technical math sessions! Thanks for you’re time.

For the L31 with the spider injectors, the answer is to go to a marine L31 intake. It takes a little modification to make it work on a truck, but it gets you over to normal external inectors and fuel rails.

I’ve been waiting for this video for months

So, let’s look at this the other way around. How big do my injectors need to be if I want to make, for instance, 500 hp from a V8? 500/16 = 31.25 lb/hr injectors. That would support NA horsepower. For boost let’s divide by 0.8 or 0.85 which, mathematically, means multiply by 1.25 or so (exactly if you’re talking 0.8). So 500 hp boosted would require 31.25x1.25 = 39.06, or, let’s call it 40 lb/hr injectors. Next, what if I’m running E85? Richard says add 30% so that means multiply by 1.3, or 40x1.3 = 52 lb/hr injectors for a 500 hp boosted engine on E85. If your goal is 1200 hp from a V8, 1200/16x1.25x1.3 = 122 lb/hr injectors, at least. Giving yourself some wiggle room would always make sense. If you always want to run boost and E85 on your V8, we can simplify a bit more. The factors for boost and E85 together are just over 1.6, so if we divide horsepower by 10, we are very close to the minimum size injectors to support that power level. Going back to the 1200 hp V8, that’s 1200/10 = 120, very close to the previous answer. So, NA injector size (for a V8), is horsepower target divided by 16. For boost on E85, injector size is horsepower target divided by 10.

Yes, the 3800 series 2 v6!!

Best video I've seen explaining the reason behind selecting injectors. Love the math brain side of it man, subbed!

Agreed, Great video.. This info needed to be addressed. PS Rich: I love when Im 5 min into your vids and I start typing something I think you're not going to bring up and then you say what Im thinking as Im writing my "smart ass" comment. Great job, again..

I love all of your videos. So much good information and using junkyard oem engines as a baseline is brilliant. Keep up the good work.

Greatest explanation I've ever heard thank you

Please get back to me because u are my man. I've learned everything from you. U are an absolute Guru to me Richard ty for all your work

It's funny how the GM 60-degree V6 had aluminum heads since the late 80s, but the 90-degree V6 never got them.

Cliffs notes: Buy the biggest injector you can afford that will have a reasonable pulse width at idle.

My 870cc(80lb) injectors x 8(4cyl) = 640hp. Under boost (x .85) = 544hp - 20psi/boost pressure = @524hp....Hmm. Perfect, that exactly where I am. My tuner was spot on! **Hey Rich, get a whiteboard!

Flex fuel injectors on mine are FLEX fuel with max of 43 psi .I'm not ever using E85 unless I'm ready to repair EVAP , sensors. Fuel pump and what ever else plugs up .

You've touched on all my loves....except the Jeep 4.0 stuff Hint ☝️

thanks for breaking it down . I love this channel .

Patience is a virtue. Cheers!

Thank you for all of the awesome information Rich!!!!💪🏻

Good info Rich

You the MAN Richard! Thanks

For the record, golf ball dimples reduce drag, increase flight path consistency, and accordingly they increase speed and distance. Golf ball dimples make for a good golf ball 🤷‍♂️ they learned that after they beat one for so long it was dimpled. Lol. Analogical and what not

Btw, this is exactly what I needed. My son and I are finally doing bench race smack talk, his yota vrs my caddy, both turboed.

Thank you for demystifying the pound per hour versus HP. lb x2 for HP per injector,

Where it gets tricky is when you have a high rpm engine, because the amount of time the injector has to operate gets smaller at higher RPM. The time the engine takes to complete the combustion cycle is shorter as your rpm goes up. For example if you have an engine with a rev limiter at 5,000 rpm it takes 12 milliseconds to complete the 4 strokes (intake, compression, combustion, exhaust). At 5,000 rpm your injector only has 12 milliseconds to operate, meaning at 80% duty cycle it could only stay on for 8.6 milliseconds. If you had an engine that made the same horsepower, but revved to 7,000 rpm, you would only have 8.6 milliseconds to operate, meaning only 6.9 milliseconds of on time at 80% duty cycle. You will need a larger injector for a 7,000 rpm engine than a 5,000 rpm engine even if they make the same exact horsepower, because it will have to flow the same amount of fuel in 6.9 milliseconds instead of 8.6 milliseconds.(excerpt)

Don't miss it show Really like 351 windsors, got 3, one is a 95 roller. One is a ,.040 over low mile motory wife ran hot!! Just can't resist a cheap turbo build, 8lb, or less. Blow thru!!! Cast pistons in it, stock rod bolts!! Gotta try it. Saw u make 743 ph@ 7.4 lbs. boost! I selling the cam? My son has 2 late model gts. Can't wait to see the look on their faces!! Now, some traction bars-drag radial, and gallon or so of primer, and fuel pump- blow thru carb!!

even old school! Thanks Richard!

A quicky calculation to adjust injector flow rate to compensate for different supply pressure is to take the square root of the ratio of the new pressure to the original pressure, and multiply that number by the injector flow rate. Say you have a 25 lb/hr injector that was originally rated at 43 psi, but you want to run it at 58 psi. The new flow rate would be 25 * square root(58/43) = 29 lb/hr

First time watching you discuss injectors. It's also my first time on your platform. It's there any guidelines for parts on the k24 to achieve 1500hp?

Best to keep the injector around 80- 85% duty cycle.

Dude man thank you. Just calculated the math on my hellcat total amount of power I can reach with the stock injectors thanks to you. So by my rough calculations on a 57lb injector I can 912 crank hp but that’s obviously not counting a roughly calculated 12% drive train loss equaling 802 hp on a dyno inside a car. And because it’s got boost and I times 912 hp by .85 =775.2 hp so what I minus 12% drive train loss from this and get 682hp when the car dynos around 625 hp stock, so in reality it’s fairly close to it’s maximum duty cycle?

You're right on about the sponsorship. They're loss.

Be great if you were in south Florida! A great engine builder you are!

boost reference the fuel tank so the stock pump produces the added fuel pressure for boost. custom tank recomended. check valve rated for boost pressure.

the LS3 stock injectors are 42lb/hr injectors and make well over 400hp.

Yes,FINALLY!! CADILLAC POWER BABY!!!

How much wood could a wood chuck chuck if a wood chuck could chuck wood?

I'm dying to see your test on the 3800 series ll engine since I have a supercharged Monte Carlo.

there a damn textbook out there some damn where on this subject but ill be damned if I know where to cop one.

Great video. A lot of great information. Thanks so much for your time and dedication. What is the chance of a follow up video on sizing fuel pumps up against a set of injectors? All the best.

If you can dodge a wrench you can dodge a ball. Have you ever seen stock 302 fuel rails be a limiting factor?

GM Gen V Direct Injection should be next video The engine has been out since 2014. It’s in all of GM’s high performance vehicles and SUV’s and Trucks. Lots of misinformation out there about the limitations of the fuel system. Questions: How much HP will the stock Gen V LT1 fuel system will support? Which component runs out first...High Pressure Fuel Pump, Injectors, Low Side Pump? A popular option is a cam with increased fuel lobe (+32-38%). I would go ahead and assume that anyone who is going to exceed the stock fueling is already doing a cam swap...so I would use this as a starting point. Another popular upgrade seems to be installing the HPFP from the LT4 ($750). For those who don’t want to get into the fuel tank...is a Boost A Pump ($400) a reasonable alternative to upgrading the Lowside fuel pump? At what power level will the LT1 injectors run out of gas...pun intended. LT1 Gen V 123lbs/hr @ 2205 psi LT4 141lbs/hr @ 2940 psi

Have you looked at low budget injector mods? I have seen a few articles and vids on decapping stock injectors to run max power boosted on E85 without spending tons of cash. Makes sense to me as stock injectors are also dead reliable and if your tuning is up to par, it's effectively just a bigger injector.

Also don't turn up your fuel pressure too high you might start a fire.

Hey Richard, Will a LS injector fit an 8.1 ? if not where is a good place to look ? Thanks

Good info!

Thanks

Can you do video on the quietest hydraulic lifter and spring combos that work well with the most common cam upgrades? Im running the new truck norris cam with comp cam 850-16 lifters and comp cam .580 lift springs which are supposed to be compatible in 243 heads on a 364ci 5.3l but cant seem to avoid the dreaded lifter tick to save my life and its driving me nuts lol. PLEASE HELP! 🙏

Love the information

You need to have a winter yard sale man.

The injector question could be based off youtube people as urself like the sloppy mechanics and decap the stock injector i believe some of the factory decapped injectors have a flow almost doubled being in the 50-70 lbs a hour range not sure been a while since i watched the video. The basic setup was factory injector deremeled the cap / jet oriffice plate /tip off lol. The remainder of the injector is "decapped and flows almost double so cleaned and ...? Idk never tried this

Hi Richard. I have a set of 42# injectors on my b230ft and I'm maxing them out around 4500 rpm in 3rd/4th. I have just been using my throttle pedal to keep from leaning out. I'm not sure what to choose as a bigger set of injectors to support the amount of power my car wants to make.

Yes The Chevy 31& 3800 V6

I wanted to see that calculator you're holding up in the preview. Is that an old HP RPN? I had a 48SX in the late 80s.

Holdener Rocks! Great presentation! Teslas Vortec? 3-6-9?

For a low RPM high torque Big Block (Olds 455) in a motorhome (MPFI conversion) does running high pressure injectors help with atomization using E85?

Question... it would seem to me that for a given power level, the MORE cylinders you are running, the lower lb per hr injectors you need... Is this generally true or am I thinking about this incorrectly? Lol.... and bam.... 2 minutes later you covered this question.... NICE.

Where can I find the injectors and fuel pump to support my application , I'm aiming 700-800hp?

I still have the Ford v10 if you are interested let me know.

Are there different spray patterns , within the EV14 injectors .

I have been wondering how boost pressure and back pressure against the back side of the valves affect valve spring efficiency.

Richard what do u have for ls stuff I might take it all. What about a Cadillac supercharger hint hint

gen 3 4.8 862 heads gen 4 pistons and rods. pqy head studs (PAC-1218) valve springs sloppy stage 2 cam tbss intakes decapped flex fuel injectors 80# elgin chromolly pushrods Was running 800 hp boosted now converting to na do I have to worry about over fueling at idle with the 80 lb injectors? I plan on running the Holley Terminator x is this something I can manage

how about get a factory 1G AWD automatic flex plate from a 4G63 DSM (for testing a 6-bolt).. should be easy to drill new holes to bolt it to whatever other fixture to bolt it to your dyno, then it's just the bellhousing adaptation maybe cut a broken trans for the bellhousing?... but we want it!

How can I learn directly

Do you have a manifold that will go to a 351 Windsor and the duel M90 superchargers

Hi Richard, great info and knowledge! I am running 36LB on my 400hp Mercedes 4 valve, 5.0 litres M119. No adjustable ECU. She is a little rice at idle. But ok wide open. What adjustments would you advise? I am running large injectors, using the sweet 16 rule

Would like to know if you can help wondering what size injector for oldsmobile 350DX block roots blown 16 efi injector plate look at 1000hp to 1500hp depending on what type of fuel and boost thanks

I have a 2004 Honda Civic si N/A 160hp stock, it is getting boosted. With a .63 a.r. Turbo. I’m going for 10lbs of boost. I just don’t know if stock injectors and stock fuel pump will be significant to run it. If not what size injectors and fuel pump lbs would I have to run.

Injector Dynamics has a good technical table showing the output of each of their injectors by fuel pressure. I'm running their ID1050X at 4 Bar and supporting 1,200+hp turbo Gen3 Hemi on 93 octane pump gas.

Very interesting info for us noobs

hey richard great video thanks but do you have any 5.0 stuff you want to get rid of im looking for cam heads

5.7 hemi with 14-15 psi of boost on E85 to get around 800rwhp, what would your recommendation be? I was looking at 95lbs injectors.

So in regards to the boost referenced fuel pump pressure. Are you saying your regulator needs to allow for an increase in fuel pressure to counterbalance your boost pressure. If so, how would one do that? Does the regulator somehow read how much boost you are running and increase its allowable pressure by that amount? Maybe I'm reading into this too deeply.

What size injectors are needed for a 6.4 hemi with whipple running 10lbs of boost. Roughly 900 hp

Hello Richard I have 4 100lb injectors in my sniper is upgrading to 120lbs be worth the work

Some bsfc numbers would be awesome on your graphs

52lbs/hr for LS9 stock injector

I have a 96 LT1 can I use stock if you injectors to make 400 to 450 horse

I’m late to the party Richard (2 months I know ) I blame my job lol 😂 do you have any B Series stuff left over to sell from back in the day ?!

thank you for the reminder math. its been a little bit of time passed since this lone wolf lol needed to use this. my 350 olds is getting a custom injection system. i m building it. sneak peak. the rocket will have a "clingon" effect. the war bird!

Is there a tool for the 4.0tool to take it out

Anything for a 4.6 3v..?? Hot rod cams.. Ford racing intake.. long tubes

I have a 13 gmc Sierra 5.3 with a bad lifter. Getting ready to do a did delete. What brand lifter and cam should I go back with? Also can I increase the cam size to add more power and still maintain reliability and 14.5 mpg. If so what's size cam should I go with?

Any cams for a 5.3ls?

Hi i have 1992 mustang with 306 engine trackflow heads and je piston with t70 turbo 10 of boost and i have 50 injctor so would you made the culcletorfor my to know is it coracet inj and what should i need fuel prucher to regulater

20 minutes in and you haven't explained how to calculate a fuel injector size yet. Injectors are specified in cc/min as the density and weight of fuel can be different, so stating what you need in weight/hour is not accurate. All the videos and online calculators are terrible.

How do I know what the stock flow lb is

What's some good budget injector for e85 lq4 700-850 hp turbo

Hey Richard need best bang for buck on 5.3 cammed 545/545 lift, possible Turbo T76,80mm. Stock PCM . So will 50-60 pound injectors support 700-800 HP to wheel. E36 chassis?

How much variance does raising or lowering the rail pressure have .

How much can you bore an LS-6, LS-3?

? 460ci ford big block try 42psi injectors with bbk throttle straight pipe in a 1991 f250 how much power ?

Great Videos, will I be safe with 24lb injectors on a 347 stroker engine using a TF stage 1 cam and 190 TF heads along with a 70mm thottle body ? Thanks

So am I safe running 30lb 315cc injectors for 300hp?

And my car is 500hp at rear wheel

When you build a 700 hp carb engine do you use the stock two barrel carb!

The calculation is for flywheel HP, or wheel HP? Talking about NA

I have the largest collection of 1999 Buick Rivieras in the world I was told that this year Riv has the largest injectors at 4.8 than any car on the road today? Yea or Nay