Diesel Engine Exhaust Manifolds Explained

In this video Todd dives deep into diesel engine exhaust manifolds, their different styles, uses, and when you should consider upgrading.
Shop the exhaust manifolds Todd discusses here:
T3 Manifolds: goo.gl/fqAu9P
Steed Speed Manifolds: goo.gl/GVEmy7
T4 Manifolds: goo.gl/VvLQMj
All Manifolds and Related Parts: goo.gl/wQh7xP
Power Driven Diesel is a specialty performance shop engaged in the engineering and development of high performance turbo diesel technologies.
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[@rustyshakelford4232]

You're such a "real" guy, I love it. No pretense or ego. "Idk how to start a video, sorry." It's all good brother.

[@terryhorne6868]

I like all your videos. Thank you for making them.

[@GMCJay_lly]

Agreed!

[@norcalray7182]

I love your camp fire style talk about manafolds.good video

[@Parents_of_Twins]

These guys are awesome. When they say call and they will help you out they mean it. I called to ask about what to look for in buying a used truck and the guy I talked to was super helpful and very friendly. I'm very glad I called because I was looking at a different style truck and they gave me some great information. I have since purchased a truck and can't wait to start adding some PDD components. Once again thanks guys for all your help and advice. Hopefully someday we will be able to make the trip out there to see your place in person. Curious do you all have anything planned for the 68rfe?

[@Parents_of_Twins]

Sweet. I was really hoping that I could get something that you all had done for my truck. I was looking for an older truck but when this came along with only 118k and in my price range I just couldn't pass it up. Super excited to know that you all will be putting out some products for it.

[@mattmorrison6958]

Really great video! Also, phenomenal to see the divider in the steedspeed manifold sealing up against the wastegate valve. We've fabricated many manifolds (4g63) with a single but divided path to the wastegate, and saw a significant loss in response and boost threshold with even a small path for cross talk without the full divider. Good stuff

[@roryjuarez6482]

These guys are the absolute most useful guys for the diesel industry awesome!

[@N.A.J.]

Always look forward to the Power Driven videos. Even though exhaust manifolds are not always directly related to more power in the overall recipe, it's a critical upgrade once a certain power level is achieved. Even for the seasoned diesel enthusiast, this video is a great refresher as to why we spend our hard earned money on such upgrades.

[@Crazystuffyousee]

Fantastic video...! I really appreciate the simple explanations and real opinions. Its hard to find video's with quality like this.

[@logansspeedshop7900]

Great to have guys like you in the diesel world, I learn something new every time I watch your videos! Love getting into the details 👍🏻

[@JerryLee..]

The thing I like (love) about you guys is the no nonsense (bs) honesty. It's refreshing.

[@Axethrash]

The owner/founder of Steedspeed lives in my Province. I have heard nothing but amazing things from local guys!

[@jc_from_tx9229]

I have one on my 24V and LOVE it!

[@samtevis9673]

​@@jc_from_tx9229 It's been 3 years, is it still going good?

[@khosrowjalali7898]

Todd , I just Subscribed. Before watching your channel I had no clue why it was so important to choose the right type of exhaust manifolds for turbos . You made it so interesting and informative and explained it in such great detail . So Thank you for making and preparing this video.

[@greendodge98]

Keep up the great work Todd. I can't wait to get some of your information first hand.

[@babybullsmith001]

I am a disabled vet and love your videos. I have a 2006 5.9 (my first dodge) better than my old GMC. Keep up the good work. When I get out to Utah, I look you boys up. God bless

[@babybullsmith001]

@@pddofficial What city in Utah?

[@jdiojustdigitout6557]

Sir, They are located in cedar City, Utah. you can go online and research "Power Driven Diesel", and will take you to the website go to the menu, click on "CONTACT US" and you will see their address on the bottom. Thanks for your service, & Between I have a 06 Cummins too.

[@garrettsctt]

Twin scroll turbo exhaust manifold and turbo inlet also stop pressure starvation. With each exhaust valve opens it's creates pressure pulses and cycles of higher and lower air pressure when the valve closes that pressure pulse can go backwards. When you get up to higher rpms your getting more pressure pulses and higher chances of that pressure wanting to go backwards. With the twin scroll it eliminates this

[@andymike6575]

Spot on. Unfortunately the EGR ports severely disturb the exhaust flow and the pressure pulses whether they’re blocked off or with egr intact.

[@Greenandsonsweldandrepair]

8:44 8:55

[@arizonaadventureriders9384]

Great reference material, I’m looking to swap to a 2nd gen to make room for the ac box in a obs Chevy

[@michaelfraser2614]

Does it change the sound

[@specializ20]

Can you make a video on he351 mods,. Different exhaust housing, compressors upgrades.. etc thank you

[@ShainAndrews]

I believe the appropriate mod for an he351 is replacement.

[@DSilDawg]

Great video (as always). Thank you for the lesson on these manifolds. A much better understanding of the types and their purpose!!

[@bdjm8595]

Great video, think I have watched it at least 3 times, lots of good info and insights, thanks PDD !!!!

[@barker3323]

Every time I watch these Videos I end up spending money

[@jeepslivin]

just my 2 cent thoughts. please correct me if I'm wrong. ok. The 2nd gen swap on 3rd gen is a big plus in my book. equal runner lengths throughout the firing ordet should balance the "pulse". that balance should help pull heat away from the problematic back three cyliders. in theory should create a smoother exhaust flow witch possibly could help with spool up. to me it's not necessarily a HP thing but an efficiency / support thing. plus on compounds things just fit better with less piping. I've seen multiple mild tune towing trucks die due to heat in 4 and 5 on 3rd gen. never seen that in 2nd gen truck. So a 2nd gen swap just makes sense to me. thanks todd

[@daviddominessy]

They are the best in the 12v business

[@mikestrucks]

That’s a helpful video ! Nice explain. Thanks guys 👍

[@thankfullife7968]

Is it ever done, a smaller T3 manifold with an adapter into a T4 turbo to help increase exhaust velocity. Ever since I’ve upgraded bd 3 piece and S362, Super slow spool up. I think I’ll be giving you a call Todd to get this figured out.

[@Sir.VicsMasher]

Hi, I have a 460whp stock fueled 110k mile 03 6 speed with a Smarty, Raptor lift pump, 3250DD clutch and a s366 that I removed to pass emissions. Now that I've moved to a place that doesn't test do you think I would see a noticeable difference in spool up by upgrading the exhaust manifold when I go to re-install it in addition a turbine blanket or do you think I should continue to save my money for other stuff like fueling mods, custom tuning or stock/s400 compounds? Thanks

[@bryanwelton1442]

Do the 12 valve manifolds brake off ears even in normal every day uses and light towing

[@philip2735]

I wonder will porting the three piece manifold would be beter for bigger turbos?

[@DieselsandOutdoors]

Good video I’ve been looking to upgrade my truck lots of good info

[@stevecarlisle3323]

Thanks for your videos. I am just learning about the b series. You say broken ears know the head? I dont see any Ears on the head. Now cast iron exhaust manifolds can break ears. That 3 piece manifold cam out in the 50,s on 855 cummins 14 liter engine. Never seen on of those break ears. The head studs are a loose fit in the holes on the manifold, so they can move longutudily!

[@joshuaquilliam2887]

Just an fyi for anyone interested, my 05 came with an open manifold, my early 04 had a divided manifold. I don't know if they chose to open it when they introduced the he351 in 04.5. But my 04 definitely had a divided manny with an open he341.

[@pddofficial]

Yes they seem to mix match through the early common rail years.

[@KyleMillsap]

You guys are the shit! Thank you

[@pddofficial]

Thank you Kyle

[@jackprice6599]

Why only log style manifolds? Why not a longer runner?

[@trialsmart]

Stronger, Simpler, takes up less space, cheaper. I also suspect that Diesel's don't benefit from equal length runners like petrol engines do.

[@JosephArata]

Equal length runners are literally a waste of steel for a diesel engine.

[@bill2178]

Because this is a turbo

[@user-el4ii7zq6l]

Thanks for all the information been watching your turbo school videos agian

[@bulldozer7656]

Wow, I learned a lot.. Thanks Todd. Any update on a new racing motor?

[@gofast4127]

Great and informative video as always , thanks...

[@RollinShultz]

thanks for the good info, it was helpful as I am a novice at diesel tech.

[@Diesel8290]

I take it by diverter valves you mean like a quick spool valve. Splitting the scrolls in a turbo. Have you had much success with them? We use them in the merc diesel tuning scene and have had 800-1000 rpm quicker spool times. And less restriction than a true twin scroll manifold

[@alexclark3217]

Can you please make a video about the diverter valve?

[@jeepslivin]

and another thought. how does going from t3 to t4 effect spool?? t4 you gain volume but loose velocity. and in a compound set up with 362/363 with 475/480.

[@JosephArata]

You do loose exhaust velocity. You'd need a larger camshaft, head work done, and valve springs to spin up past 4,000 Rpm to run larger exhaust housing compound turbos. Typically though, S362 with S475 shouldn't need that.

[@JaegerWrenching]

Great video as always thanks for putting out all the good info!

[@thebigrandy321]

have yall done the dyno runs to see how much the divided combo set up speeds up the spool?

[@emeraldstevens8922]

Will a 12 valve exhaust manifold fit a 24 valve?

[@tbone707]

Any thoughts on the stainless diesel manifold? It’s made with moon metal? Supposed to flow well and retain heat

[@PopsHowTo]

Rebuilding a stock 5.9 common rail due to having cracked rings. Would an after market exhaust manifold help stop that from happening again? I'm not looking for power just reliability. Thank you for the videos.

[@offthegridoutdoors9666]

I just rebuilt my 06 cr due to cracked rings I'm putting on a dps manifold supposed to reduce rear cylinder heat by 200 degrees and they seem to have good reviews. will see seems like the stock manifolds on 3rd gens have crappy flow from the rear cylinders my 5 and 6 run hotter than the rest with stock manifold by like 100+ degrees according to my heat gun after towing so gonna try a dps out. It was my 5 and 6 cylinders that had the cracked rings so worth a shot.

[@joshuaquilliam2887]

Yup my 05 broke the ring land on 6@@offthegridoutdoors9666

[@timdrutowski2910]

The industrial manifolds are what you use for Fummins swaps as well 😁😎

[@yz125riderrr]

Is it okay to mate a 2nd gen pulse manifold with dual volute channel to a turbo that only has single volute?

[@pddofficial]

Yes no problem.

[@ronnyenns9469]

I have a single 76mm turbo, and it’s very slow spoiling, what would the difference be in spool up open vs twin manifold? In RPMs

[@greggehrke243]

Always great videos. Thank you.

[@forchristsgloryamen858]

Thank you for the in-depth explanation.

[@Sazabizc]

On my 03 Dodge Ram. The manifold had a diviner and the turbo didn’t . It’s a stock manifold and it was a stock he341. I now have a holset cheetah turbo base off a he351 and it also didn’t have a divider in the exhaust housing.

[@highoctain113]

I like how they have classified their videos as commercials so when I get hit with one its worth watching the commercial

[@Neverquit275]

Great vid much needed!

[@smallblockfuelie]

Will your Agressor 62 turbo fit and clear on the 3 piece PDD manifold you show at the beginning of this video?

[@dante04srt]

This video got me thinking about pyrometer probes. On the factory divided manifold, where do you recommend Drilling and tapping? Since it's a divided manifold, aren't you just monitoring three of the cylinders exhaust temperatures by just having one side or the other?

[@imi1667]

Hi I know I'm 4 years late but it doesn't matter just put it in the middle of one of the ports

[@libertyss32]

Would a twin SCROLL manifold to a open housing turbo manifold be safer then vise versa?

[@jeepslivin]

ok. my thought on 3rd gen to 2nd gen ex man swap is not neccasarily performance but it is at the same time.... equal runner length equally diveded should give a more iniform exhaust pressure, more equal ex temps and supply a more even "pulse" to the turbo. while hp numbers may not go up...efficiently (spool) should and really help with 3rd gen problems of killing #4 & 5 pistons. would love your feedback

[@chriscanterbury8647]

Thanks guys for the info!

[@sunelarsen]

Cool info. thanks Todd!

[@tomthurk2765]

Why not equal length like a header on a gas motor could there be something found there

[@brentmcmahon8188]

I know I don’t need a 2 nd gen swap but I want it and it’s a stock truck and what is best high mount or the stock mount down low ?

[@pddofficial]

The stock mount down low generally has more options and saves you from changing the oil feed lines in most cases(depending on turbo setup)

[@jimkillen1065]

i going to probably buy a manifold and i appreciate the information . I just want to use my truck to tow with thanks

[@pddofficial]

Glad I could help

[@BLZArmwrestling]

A lot of people do 2nd swap because of the engine sound. 2nd gen sounds bad ass

[@Thepriest39]

Great explanation.

[@FirstGenDiesel]

Whats your opinion on the BD stainless manifold?

[@mustangdemon87]

From personal experience dont go stainless. It expands an contracts moreso then the other metals. Cracked one in under 6 months. Have pdd one for over year no issues. Bought another for my other second gen now

[@jeffstepp8443]

Great video! Thank you

[@douglasdayton9327]

If you are pulling a camper do you need exhaust manifold?

[@LegendMuscle]

hey todd in your opinion would it be worth self porting/polishing a stock manifold and where would the best place be to tap for egt sending unit 5.9 24v

[@mustangdemon87]

Rear of the two outlets that go to turbo is the best place to put the prob. Gasket matching stock manifold would help a little. Not enough to notice by seat of the pants tho due to your not really changing to flow inside the manifold.

[@LegendMuscle]

@@mustangdemon87 rear being underneith?

[@donpitkin8807]

Great video , on a stock 3th. gen with a tuner will after market exhaust lower egt ?

[@donpitkin8807]

Thank you for the reply , the truck is stock with tuner but read were back 2 cyc run 200 deg hotter and could damage a piston ?

[@ronniehaycraft4052]

Is it worth changing manifold on a 2nd gen 24v? Do they suffer like 12v 2nd gens? Thanks

[@RamboTheCEO]

Great explanations!!!

[@Mj-CWO4]

I have a 2001 Dodge Ram 2500 with 5.9L diesel and want to upgrade to about 500hp what turbo and manifold do you recommend?

[@Thedoug369]

How can you flow enough air thru those little manifold outlets to make that big power? Obviously you can, but it doesn't make sense to my small brain lol. That would strangle a gas engine. Love the channel, I'm trying to do a 12v swap on my blown up ( shocking I know lol )08 F250 6.4 truck Good info here 👍

[@bigdiffas]

Hi there. Have you ever tested twin-scroll vs. single-scroll side by side?

[@bigdiffas]

I think those housings would be quite nice to be tested since they are commonly available. On gasoline world some have reported 300-500rpm earlier spooling and bit higher power output. that would be actually quite a big thing in diesel application

[@user-tn7ew2fx1d]

Great job! Keep'm coming.

[@sugargoldy]

Good video thank you I have a 2006 Dodge Ram 3500 single wheel Cummins stock Turbo smarty jr. 5 inch exhaust cold air intake turbo Rings been moved and aftermarket elbow intake I was wanting to put an exhaust manifold on my truck just for maybe making the et's a little cooler should I put one on what one would you recommend or should I just leave it alone and I have a Boost fooler on it and the transmission is stock automatic

[@Darezombie]

So I went with an ATS manifold on my truck when the original warped and began to leak. Over all my egts didnt seem to drop drastically (maybe 100 degrees give or take.) On the top end but they did seem to reduce alot faster overall when I let out of it. I also have noticed faster spool up and an overall more even powerband. Hope this helps.

[@sugargoldy]

@@Darezombie THANK YOU

[@andrewdawson4912]

How about race application header like manifold? Do you feel they take away from or too prone to cracking?

[@andrewdawson4912]

@@pddofficial Thanks.. I always thought they did it to increase spool making each pipe either specific diameter, equal length etc..

[@robertcotrelljr8573]

You mentioned a diverted valve, any news on that yet? Has it been tested yet?

[@michaelcuff5780]

Dont you guys do any 3rd gen stuff?

[@hammerhead2558]

Learned something! Thanks

[@derekperry3951]

Can u explain on dumping the waste gate back in the hot side of the carger. Will this help with spooling or just blow off purposes

[@NBSV1]

derek perry He’s talking about a compound turbo setup with multiple turbos. You can dump the wastegate from the first turbo into the second one to help it spool rather than just dumping it to atmosphere.

[@derekperry3951]

Thank u for clearing that up for me im thinking about running 366 over 480. But i dont have a waste gate on eather one. Can i run them with over waste gate? Or is it a must for compounds thank u again

[@derekperry3951]

Sorry i ment without waste gate

[@derekperry3951]

Ok thank u for all your information.

[@6bt_str86]

Have First second gen p/pumped (bone stock) shortly after shutdown there is a "cooling pop"sound numerous times equally spaced of approximately every 3m or thereabouts, over what I'm sure is until cool enough (I've never hung around the complete cycle to time it ceases) 1 is that the manifold receding back to cooled "sizing" and is it something of concern anyone? Thanks in advance.

[@timkraus1795]

Great video

[@khall81]

Does the Steed Speed 3rd gen manifold split the cylinders for a twin scroll/dual volute?

[@brettlamont5266]

Why would you not make a custom sch10 tubular manifold? Instead of a cast

[@monsterram6617]

Watching this video was exhausting...

[@NissanPRO4X]

This video boosted my knowledge but left me exhausted.

[@lman147]

@@pddofficial thank you for the info, unfortunately I have recently broken one ear on my manifold, is there any advice on the best way to reattach it?

[@paultavres9830]

Logan Paris Get a new one or try to have it welded Probably better putting the money toward a new one with a warranty Should also replace all the mounting hardware Good luck

[@juancornetto8243]

A performance part... in as much as : "To finish first, first you have to finish"

[@JungleMotorSports]

can the three piece manifolds be ceramic coated?

[@pddofficial]

Yes they can

[@welchmusic9270]

Would a cracked manifold decrease the amount of boost?

[@angelosmith8755]

Hi, What kind of material is the best option for bilt an exaust manifold? Inox, aluminium or cast iron

[@angelosmith8755]

@@pddofficial Hi, tanks for your opinion

[@TheMEXICANBEEF]

@@pddofficial I've had good service from my stainless diesel manifold with compound he351/s475.

[@MrOgre1110]

Made me laugh near the end, "all my trucks half manifolds" Haha Great informative KZbin video thanks.

[@wyattlewis8671]

Are there any manifolds that provide performance increases on a 24 valve? Any that you'd recommend?

[@wyattlewis8671]

@@pddofficial I've got a 63/68 s300 on it right now, it'll probably get p pumped and compounds eventually. Is there anything that's kind of in between the stock manifold and steed speeds?

[@jamesgizasson]

I've got a mostly stock 12 valve that needs a new manifold. Does the Steed Speed hold up long term? Just based on the material and construction, I'd imagine it's the best I can get... thoughts anyone? :)

[@pddofficial]

They Steed Speed manifolds are excellent. The ceramic coating wears/flakes quickly in bad weather climates, but the structural integrity of the manifold is excellent.

[@jamesgizasson]

@@pddofficial Thank you! Now I've just got to sneak one into Commiefornia! X3

[@ChrisLawley43]

Thanks for sharing.

[@moeshouse575]

a long inline ext manifold that breaks a lot. sounds like my old 225 slant 6

[@steveelco114]

I hope this is not a lame question? What is the years for the 1st 2nd 3rd Gen. And so on?

[@steveelco114]

@@pddofficial thanks for your response :)

[@robertthibodeaux4435]

PowerDrivenDiesel Now you’ve got me confused! On your website for Dodge parts,Y’all list the 07.5 6.7 as a 4th Gen! Thx for the videos!

[@ELPATRON839]

What is diesel spoil?

[@ELPATRON839]

Spool

[@timothydean]

Good video

[@JC-gw3yo]

Good common sense info... thanks

[@pddofficial]

Glad it was helpful!

[@burningdinosaurs]

Finding the right flow for a video can be hard.