Husker6.5
135' diagonal 16:9HD, 25KW sound!
Optimum Combustion Disorder!
-
Welcome to The Truck Stop! We see you haven't REGISTERED yet.
Your truck knowledge is missing!
- Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
- We have tons of knowledge here for your diesel truck!
- Post your own topics and reply to existing threads to help others out!
- NO ADS! The site is fully functional and ad free!
Problems registering? Click here to contact us!
Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!
Head flow info
- Thread starter Twisted Steel Performance
- Start date
Optimum Combustion Disorder!
FellowTraveler
Well-Known Member
So damn expensive those engine dyno's.....however they are a great tool!
One was for sale here a few months back... 50K.... it was a old model also...
Husker6.5
135' diagonal 16:9HD, 25KW sound!
Sounds like something Paul could buy and put in his garage. Then we could all meet out in Utah for 6.5/6.35/6.2 only dyno days!
FellowTraveler
Well-Known Member
Great tool if you plan to make $$$$ that is unless you have deep pockets just to say you have one.....
Will L.
Well-Known Member
Fiy- ran across this video that a cummins shop made. For folks that think porting heads doesn’t apply to turbo diesels-
Go watch multiple of their videos and others showing dyno numbers of no other changes than stock to ported heads. Remember experience makes the differences- knowing what to grind away and what to keep makes the difference.
Ok link didn’t work, but the YouTube channel is called Power Driven. Look through their videos on ported vs stock. Obviously they put a tune in so it could be perfect for the ported heads then worse with the stock. But if it over fuels that bad stock and make 200hp more ported head- it should teach nay sayers something…
Go watch multiple of their videos and others showing dyno numbers of no other changes than stock to ported heads. Remember experience makes the differences- knowing what to grind away and what to keep makes the difference.
Ok link didn’t work, but the YouTube channel is called Power Driven. Look through their videos on ported vs stock. Obviously they put a tune in so it could be perfect for the ported heads then worse with the stock. But if it over fuels that bad stock and make 200hp more ported head- it should teach nay sayers something…
Rockabillyrat
SlIgHtLy StUpId.
Porting heads on a high rpm diesel that is pushing triple the air and fuel of any high performance 6.5. Absolutely worth it because your hitting a restriction in the head.
I'm not a nay sayer when I comes to porting heads. I'm just a beliver in data, and these heads can easy support the HP goals most are after. If I remember correctly both the 6.5s that hit 500hp recently did it with stock heads. It's just a waste of time on these engines. Spend your time on the bottom end and rotating assembly.
Port velocity is something people over look. Sure all that extra air flow is great at high RPMs. But how often am I pushing my truck to thoes levels. Give me low end torque and instant turbo spool. The 5 speed is gonna love it
I'm not a nay sayer when I comes to porting heads. I'm just a beliver in data, and these heads can easy support the HP goals most are after. If I remember correctly both the 6.5s that hit 500hp recently did it with stock heads. It's just a waste of time on these engines. Spend your time on the bottom end and rotating assembly.
Port velocity is something people over look. Sure all that extra air flow is great at high RPMs. But how often am I pushing my truck to thoes levels. Give me low end torque and instant turbo spool. The 5 speed is gonna love it
Last edited:
Rockabillyrat
SlIgHtLy StUpId.
I guess my point is. If stock heads flow enough to support almost 400hp stock with out a turbo. Why port then if your not going to build a pump for that power level. A 110cc pump will do 350ish hp. A full out buillt .310 DB2 will only get you around 400hp. So again why touch the heads.
If you listen to old drag racers they always say you want the smallest ports that support your HP goals. Stock heads are plenty. Pair that with a 1:1 drive to boost pressure and a camshaft with less LSA and your going to have one hell of a torque monster. Maybe some square cups too...
If you listen to old drag racers they always say you want the smallest ports that support your HP goals. Stock heads are plenty. Pair that with a 1:1 drive to boost pressure and a camshaft with less LSA and your going to have one hell of a torque monster. Maybe some square cups too...
Will L.
Well-Known Member
I agree you never want bigger chambers than required, but cleaning up ports and improving velocity is a definite help.
Before I gave up on the pmd chaos, i was doing moderate port jobs and running gm8.
I can’t remember actual stats anymore but it was a measurable improvement.
Now, I learned the hard way over porting sbc gassers, so when I did the 6.5 heads i just cleaned up the obvious stuff and did the normal basic rules of roof vs floor- smooth the fat wall, everything sanded 60 or 80 grit smooth.
When I jumped up to the twins - porting big made a big difference. Not ported at all was super obvious mistake and thats when I learned the difference in precups- coming to same conclusion as most 6.5ers in the diamonds. The valve job was MASSIVE difference. Anything less than 3 angles just killed the twins. But that definitely falls in the extreme use for people.
I agree Turbo was far more critical than porting, but most folks can swap a turbo fairly easy. Pulling heads off doesn’t happen but once usually. So a simple clean up job before assembly seems time well invested to me.
@Rockabillyrat I wouldn’t call you a “nay sayer”- I put you in the caution category.
Doing the math that includes air speed as probably more cruise than volumetric numbers- which I can’t argue against.
idk if I agree about the cc:hp ratio and not porting heads.
@n8in8or put 650 to the wheels with 122cc. The standard to discount the 4l80e and rear diff losses is 15%. Even with newly rebuilt trans, better tc, etc. there is NEVER a 4l80e, and fresh rebuilt rear end doing only a 10% loss. So call it half way at 12.5% losses for easy math. 400bhp loosing 12.5%=the 350 whp he landed on.
Man, we really need our own dyno. Why do I keep saying that? Someone distract my wife which I find her credit card…
Nate-care to add your specific turbo into the mix on this thread? Your estimates of actual fuel output because of the LP pressure you were doing possibly restraining it? Your turbonium being streetable at that layout & input of min/ max fuel required for it?
Before I gave up on the pmd chaos, i was doing moderate port jobs and running gm8.
I can’t remember actual stats anymore but it was a measurable improvement.
Now, I learned the hard way over porting sbc gassers, so when I did the 6.5 heads i just cleaned up the obvious stuff and did the normal basic rules of roof vs floor- smooth the fat wall, everything sanded 60 or 80 grit smooth.
When I jumped up to the twins - porting big made a big difference. Not ported at all was super obvious mistake and thats when I learned the difference in precups- coming to same conclusion as most 6.5ers in the diamonds. The valve job was MASSIVE difference. Anything less than 3 angles just killed the twins. But that definitely falls in the extreme use for people.
I agree Turbo was far more critical than porting, but most folks can swap a turbo fairly easy. Pulling heads off doesn’t happen but once usually. So a simple clean up job before assembly seems time well invested to me.
@Rockabillyrat I wouldn’t call you a “nay sayer”- I put you in the caution category.
Doing the math that includes air speed as probably more cruise than volumetric numbers- which I can’t argue against.
idk if I agree about the cc:hp ratio and not porting heads.
@n8in8or put 650 to the wheels with 122cc. The standard to discount the 4l80e and rear diff losses is 15%. Even with newly rebuilt trans, better tc, etc. there is NEVER a 4l80e, and fresh rebuilt rear end doing only a 10% loss. So call it half way at 12.5% losses for easy math. 400bhp loosing 12.5%=the 350 whp he landed on.
Man, we really need our own dyno. Why do I keep saying that? Someone distract my wife which I find her credit card…
Nate-care to add your specific turbo into the mix on this thread? Your estimates of actual fuel output because of the LP pressure you were doing possibly restraining it? Your turbonium being streetable at that layout & input of min/ max fuel required for it?
Will L.
Well-Known Member
Sorry, I meant head flow opinion to the mix on this thread. Jumping ahead of myself about the turbo thread I recently opened
The 2 I'm aware of weren't only diesel fuel, they both were injecting methanol at high numbers, so that isn't accurate data, we may not be talking about the same 2 also....
A lower lsa will improve the curve of both HP & torque range, thats why my grinds do just that and other changes.
We can agree to disagree....
Rockabillyrat
SlIgHtLy StUpId.
The Banghart truck did 450hp on fuel alone, and 500hp with water meth. With untouched Promax heads. They fudged the dyno a little to get the 450 number, but it's not far off in reality. Tyler's truck I dont recall if he's used water meth but he he is running stock heads and square cups.
500hp on fuel alone is going to be a challenge with a marine db2 or 6033 ds4. The only way your gonna get there is with a big bore db2. But it would not be fun to drive daily in my opinion.
Rockabillyrat
SlIgHtLy StUpId.
I dont see a issue with port matching or cleaning up the castings. But I wouldn't open up the ports unless I was building a pulling or drag truck.I agree you never want bigger chambers than required, but cleaning up ports and improving velocity is a definite help.
Before I gave up on the pmd chaos, i was doing moderate port jobs and running gm8.
I can’t remember actual stats anymore but it was a measurable improvement.
Now, I learned the hard way over porting sbc gassers, so when I did the 6.5 heads i just cleaned up the obvious stuff and did the normal basic rules of roof vs floor- smooth the fat wall, everything sanded 60 or 80 grit smooth.
When I jumped up to the twins - porting big made a big difference. Not ported at all was super obvious mistake and thats when I learned the difference in precups- coming to same conclusion as most 6.5ers in the diamonds. The valve job was MASSIVE difference. Anything less than 3 angles just killed the twins. But that definitely falls in the extreme use for people.
I agree Turbo was far more critical than porting, but most folks can swap a turbo fairly easy. Pulling heads off doesn’t happen but once usually. So a simple clean up job before assembly seems time well invested to me.
@Rockabillyrat I wouldn’t call you a “nay sayer”- I put you in the caution category.
Doing the math that includes air speed as probably more cruise than volumetric numbers- which I can’t argue against.
idk if I agree about the cc:hp ratio and not porting heads.
@n8in8or put 650 to the wheels with 122cc. The standard to discount the 4l80e and rear diff losses is 15%. Even with newly rebuilt trans, better tc, etc. there is NEVER a 4l80e, and fresh rebuilt rear end doing only a 10% loss. So call it half way at 12.5% losses for easy math. 400bhp loosing 12.5%=the 350 whp he landed on.
Man, we really need our own dyno. Why do I keep saying that? Someone distract my wife which I find her credit card…
Nate-care to add your specific turbo into the mix on this thread? Your estimates of actual fuel output because of the LP pressure you were doing possibly restraining it? Your turbonium being streetable at that layout & input of min/ max fuel required for it?
Last edited: