using the turbo booste port ; need tech. help - PeachParts Mercedes-Benz Forum

coachgeo · #1 06-06-2003, 10:15 PM

Anyone know if the port on the 5cyl 300 turbo Diesel (1984 era) for the booste gauge is metric threads orrr? .

ok, after some talk with an engineer about an LP booste setup the desision is to use the port where the turbo booste gauge gets it's pressure. I want to put a Y into this port. ONe side of the Y will be the booste gauge and the other side the LP injection.
Anyone see a reason to NOT use this port. If so... please have handy a suggestion on another port usable for LP injection.

Why LP injection? Load up ur car or waggon with the 5cyl 300 turbo in it untill it weighs 5 1/2 tons then try driving up long upgrades and you'll understand why. You'll understand even better if you change the gear rations to LOW tractor like power. Thats my set up.. a Unimog w/the 617 925

LP will only be used on hills.. sorta like a nitrous kick in a gasser.

hihosilver · #2 06-07-2003, 01:33 AM

my 83 does not have a boost guage, the only port would be the port for the waste gate and it is a puch on with a hose clamp

coachgeo · #3 06-07-2003, 07:48 AM

Quote:

Originally posted by hihosilver
my 83 does not have a boost guage, the only port would be the port for the waste gate and it is a puch on with a hose clamp

Im wondering if we are talking the same thing..... I have no clue where the wastegate is, nor if that spot could be used for a boost gauge

Then again maybe my port was added by the previous owner?

hihosilver · #4 06-07-2003, 11:23 AM

the waste gate is to set the boost of the turbo and the line that I was talking about tells the waste gate to open or close by the pressure

coachgeo · #5 06-13-2003, 10:58 PM

I found this pic while doing a search here on this BB. This is not my engine but it is a good sample shot. I labled it to show where my boost gauge line is installed. It is a standard SAE pipe thread I discovered today.

Here is what the engineer who designed the LP set up I have comming to me said about using this port for serveral purposes, including the boost gauge.

Quote:

The boost gauge port is the ideal place; a tee will be fine, or even two of them. The propane and water (injection) will have the max run length possible to evenly disperse. The propane is a gas of course, and will mix completely. The water will rapidly vaporize because of the heat and do likewise.
THanks,
Joel

I most likely wont do water inject at this time. Maybe Alcohol/Water someday "only if" it can replace effects of the LP. Just thinking that if say I ever venture onto a major excursion like heading toward the tip of South america.. LP will be harder to find than 99% alcohol!

My wonder is; is not pressure is going OUT this port to the boost gauge. So would that not mean that anything (or some of anything) that is injected here,go out toward the gauge and not into the intake?

Im also little concerned of LP leaking out into my cab at the gauge. NO SMOKING. The LP is intended to only be used for up hill climbs in my 5.5ton MB

Any comments on my wonderings and concers will be greatly appreciated

hihosilver · #6 06-14-2003, 12:59 AM

at the other end of the manifold is a vacuum port that might work better, unless your propane inj. is greater pressure than the turbo, if it is higher pressure than the turbo your boost gage will reflect this. on the plus side if you inj. at the turbo the cooler propane should really help.

sixto · #7 06-14-2003, 03:05 AM

hihosilver, there is no vacuum port in a Diesel manifold because there is no vacuum to speak of in an engine that doesn't throttle air.

coachgeo, check with folks who use water injection on turbocharged gassers. They know how to build water injection systems with higher pressure than max boost so it does spray under boost. There might be a way to fashion a squirter like a pitot tube so it sprays with the airflow rather than across the airflow. But maybe spraying across the airflow is better for mixing.

Check out:

http://www.utterpower.com/waterinj.htm

http://www.racetep.com/wik.html

http://www.duramax.bizhosting.com/My_Truck/water_injection.htm

Sixto
95 S420
91 300SE
87 300SDL
83 300SD

coachgeo · #8 06-14-2003, 11:15 AM

Quote:

Originally posted by hihosilver
at the other end of the manifold is a vacuum port that might work better, unless your propane inj. is greater pressure than the turbo, if it is higher pressure than the turbo your boost gage will reflect this. on the plus side if you inj. at the turbo the cooler propane should really help.

Thanx... are you speaking of the bajo bolt or the one below it?

I have already spoke with the designer of the system I'm using and this area is not good for injecting cause it is at the end of the air flow and wont evenly distribute the vaporized gas. BUTTTTTTTTTTTTT

It has other use potential to me if their is a port back there,
AKA --> wastegate controller! Can you give me more detail of where the port you speak of is?

PS... yes, I know they are not vacume ports. and Yes both injectors are greater pressure than the turbo.

coachgeo · #9 06-14-2003, 11:23 AM

Quote:

Originally posted by sixto

...There might be a way to fashion a squirter like a pitot tube so it sprays with the airflow rather than across the airflow. But maybe spraying across the airflow is better for mixing.
......
Check out:....

Sixto

Pitot tube? Don't know the name but I think I get your drift. Cool idea if I'm thinking right. Basically just a tube that protrudes into the port some and curves in direction of air flow. Think Pitot tube, like a tube you put on the end of your WD40 can right?

I think your second thought is right though. It should vaporize better and maybe get distributed better injected perpendicular to the flow of air.

Both injectors comming to me are greater than the turbo boost.

sixto · #10 06-14-2003, 03:23 PM

A pitot tube usually points against the flow to catch a sample of airflow. In this case it points the other way as you surmised. There might even be beneftis from the Bernoulli effect.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD

coachgeo · #11 06-16-2003, 12:40 PM

Ok... so here is my new reviesed questions

1. Is there a port below the banjo bolt in the back of the intake? Mine has another bolt there that looks simular.
2. Can I use that or a different port (besides the usual one) for the Wastegate pressure.?
3. Does anyone see a reason to NOT use the ports I have now for boost and the port that is now used for wastegate pressure as points for LP and or water/alcohol injection?

THANX.