what tweaks can be done to improve spool

[rivercat]

Anyone want to share any tweaks? Aside from a cam what else can be done ? head porting? the bowls under the valves on all or just exhaust ?

manifold porting ? turbine housing porting ?

Does adjusting the valves tight or loose make a big diffrence?

does a htt or ats manifld make any diffrence in spool?

Im no expert but seems like all the availible drugs would only help the top end.

I find myself wanting to tow more weight then I did, And now spool comes into play. I am at the power level that puts me too hot for a hybrid - a tad too laggy with a S300 varient. Not that im unhappy with my PS just looking for a tad more spool to tow+less smoke in town on the bottom.

Its been said that the SPS 62 with its bigger turbine and housing offers better spool AND better flow over my PS. I would like to hear that from the horses mouth so to speak, BRETT?

Bob, I guess it might be time to trade the catcher for the new improved smarty.

 

[pwerwagn]

A minor increase in spoolup (and I mean MINOR) can be found by heat-wrapping the ex manifold. I did it to mine and it was slightly noticeable, but the egt reading at the gauge also increased.

Another member on here, I think it was Y-Knot, heat wrapped his manifold also a while back and he was running a larger charger than me. You may contact him.

Maybe if you add up all these little tricks, you can end up where you wanna be!



--Jeff

 

[TORQUE THIS]

Mach 4's and the ECM that I see in your sig should spool that turbo really well...

I wonder if you have a boost leak somewhere?????

 

[Diesel Freak]

I feel your pain!!!



I ran a B-1 EX4 a long time ago, and it spooled slow, and ran hot while towing. It just did not respond to engine load very well... surged on occation too.



Merging with traffic grossing 19K was no fun at all. EGT would shoot through the roof. Basicly too much rotor weight, and too much fuel. It was more of a competition turbo than an every day driver/towing turbo



However the truck would make 474 HP on BD's dyno.



I am not a fan of the S310/320 crop of hybrids

 

[Diesel Freak]

I have e-mails out to both K&N and AFE.



But no returned info!!!

 

[rivercat]

Its all most like the comp wheel has too much pitch on the blades it just wont provide any air till 10 then it hooks so hard you gota grab something. I am in no way knocking this charger Im sure it is nothing like a full b-1 as far as spool. My biggest problem is the big 37s put allot of lag into launching anyway- they are SO big and heavy I have never spun taking off in 2wd. Guess I need to run my old 305s for a while and see how it feels.

Whould the first stage of water on a snow kit help spool?

Is it easy to say turn things down on the snow kit so you don't lift the head the first time out? I know water don't compress good especialy when its probobly turning to steam in the cylinder.

 

[RustyJC]

Hey, if you're willing to look at cams, piston configuration, etc. and aren't afraid of some product development, here's some "thinking outside the box".



Do you have on-board air with a decently sized reservoir? Our large 2-cycle industrial engines use "jet assist" on the turbocharger(s) to provide scavenging air until the engine has enough load (read, exhaust energy) to make the turbocharger(s) self-sustaining. You would need to add 2-3 nozzles to the compressor housing - these nozzles would be aimed so that the air impinges tangentially on the ends of the compressor impeller blades so as to accelerate the impeller when the air is admitted. A throttle switch could be used to turn on the jet assist via a solenoid valve when you hit the throttle, and an Agastat (or similar) timer could turn off the solenoid valve 4-5 seconds later.



Rusty

 

[rivercat]

interesting... But not what im looking for. I am ready to port my manifold and turbine housing but not if the difference can't be felt in spool and not just on the pyro.

 

[RustyJC]

interesting... But not what im looking for.

Sorry - I didn't see any restrictions in your original question. I could delete my post, but maybe I'll leave it just in case it might get someone else's thought juices going - like a few years ago when we discussed honeycomb airflow straighteners. :-laf



Let's play this hand out a little farther. Would it be beneficial for a diesel truck (especially with a manual transmission) to be able to build turbo boost with no engine load when sitting at the starting line of a drag strip or sled pull (or, heaven forbid, a stoplight)?



Rusty

 

[rivercat]

Im just saying im looking for cheap-Tweaks not Re engineering my motor, if I wanted to spend thousands and tear my motor down I would put in a Helix 2 or 3 with the springs and retainers or twins and the cam and snow's kit.

 

[RustyJC]

Yep, you made it very clear that you weren't interested, and that's fine. As I said, I just left the post for the possible benefit of others.



Rusty

 

[Devildog]

Rusty,

That is interesting and feesable if you think about it.

 

[RustyJC]

Rusty,

That is interesting and feesable if you think about it.

Yep. Pure turbocharged 2-cycle Cooper-Bessemer engines have used jet assist for over 40 years.



Rusty

 

[rivercat]

thats what im saying it is interesting and im glad that you did post. but its just not what I was looking for. In other word I did mean to offend you by saying "interesting... but not what im looking for" so, sorry.

I am also interested in what to do with my crank case vent. I know a race engine builder that has an engine dyno and all the good machines to turn out a fine running restrictor plate engine. Hey insists on plumbing the vent lines into the collectors on the headers at a specific angle-not sure what- to pull a slight vacume on the crankcase in the case of a wet sump motor, But he is not into Diesels and does not want to tell me wrong on this. I want to ditch the bottle but don't want to do any thing that causes any more pressure than what is there now, Like This https://www.turbodieselregistry.com/forums/showthread.php?t=73627&page=5&pp=15

 

[RustyJC]

You might want to do a Google search on "eductor".



Rusty

 

[Forrest Nearing]

I ran my blowby tube to my downpipe... pushed the dipstick out of the tube...

thats what im saying it is interesting and im glad that you did post. but its just not what I was looking for. In other word I did mean to offend you by saying "interesting... but not what im looking for" so, sorry.



I am also interested in what to do with my crank case vent. I know a race engine builder that has an engine dyno and all the good machines to turn out a fine running restrictor plate engine. Hey insists on plumbing the vent lines into the collectors on the headers at a specific angle-not sure what- to pull a slight vacume on the crankcase in the case of a wet sump motor, But he is not into Diesels and does not want to tell me wrong on this. I want to ditch the bottle but don't want to do any thing that causes any more pressure than what is there now, Like This https://www.turbodieselregistry.com/forums/showthread.php?t=73627&page=5&pp=15

 

[pwerwagn]

This is sorta what is done with some of the Rally cars. Except they use CO2 instead of comp air.

Wicked6 and I have actually discussed possibly trying this on a CTD. When we get bored, of course...



--Jeff

 

[pwerwagn]

Oh, and I really doubt the first stage of H2O would help initial spool. You are not flowing water until the boost is up usually. I dont think I would want the water injecting until at LEAST 10psi, I'd prefer above 15.

 

[MCummings]

Ok, Now, Where to inject the air? Would it be better to actually spool the turbo? or to put it in the intake first? Then how much CFM would be needed?



Co2 would have to be plumbed into the exhaust manifold, as it would put the O2 % in the intake too low to keep the engine running.





Or we could do like Detroit, and big generator engines that use a supercharger, or even a turbo with a one way clutch to get going,, then once the engine is flowing enough air to drive the exhaust turbine, the "belt drive" is then ignored... .



Now,,, What to do with these idea's? LOL





Merrick

 

[RustyJC]

Ok, Now, Where to inject the air? Would it be better to actually spool the turbo? or to put it in the intake first? Then how much CFM would be needed?

You'll get much more bang for the buck to use the pressure, mass and velocity of the compressed air to spin up the turbo's compressor impeller than you will just dumping it into the intake. You want to extract the energy from the compressed air - the fact that, once that is done, the injected air winds up in the intake tract is just icing on the cake.



How much CFM? Not as much as you think. Regulated supply pressure and nozzle sizing would have to be determined experimentally just as we do when we set up one of the large engines - I don't know what it would take to spool a given turbo someone might be using up to X pounds of boost.



Rusty