Where to put pre-turbo EGT probe...

[HoleshotHolset]

I noticed a blown out exhaust manifold gasket at the front-most cylinder... it's coming out of there pretty good, and yes I know I'm loosing power as a result of this.

Since I have to take my exhaust manifold off to change all the gaskets it's going to be EASY to drill/tap the manifold for an EGT probe. I plan on smoothing out the inside of the manifold and 'gasket-matching' the turbine housing/manifold while I'm at it.

A lot of folks put the probe right at the head... . but since it will be so easy to put it anywhere I'm wondering where the best spot is and how deep to run the probe and at what angle to drill it... .

I was thinking of putting it right before the turbo on the manifold side... but any suggestions would be nice.

Does anyone have 6 probes, if so... is this necessary/useful?

Matt

 

[illflem]

#ad


Drill the port at a right angle to the manifold, the probe tip only needs to protrude 1/2- 3/4". There is no advantage to drilling with the manifold removed.

Six probes would be great if you had a CTD in an airplane but for our application I feel it's a waste.

 

[Extreme1]

What illflem said!



The only thing I can add it that in most EGT instructions I have seen it states to place the tip of the probe in the middle of the exhause stream.

 

[HoleshotHolset]

Thanks for the pic! That pretty much solves my dilemma!

The reason I ask is that my boss' airplane has a WAY COOL EGT gauge... it's all digital and has bar graphs for each of the 6 cylinders. I know it's probably a LOT of $$, but it was pretty cool to watch the cylinders heat up as he leaned it out to save fuel at altitude.

Why the rear port and not the front one?

I'm wondering if the B5. 9 has cylinders that run differently as far as fueling... EGT in each exhaust runner would show that... . most engines are a bit unbalanced as far as EGTs.

I'm getting nit-picky, but I'm trying to learn as much as possible about my engine.

I do agree, though that for all intents and purposes... one probe in the previously aformentioned location is fine.



Matt

 

[illflem]

I don't think it makes much difference front or rear port. Maybe for ease of wiring? You are correct about the cylinders running at different temps. The two in the center are cooler, outer most are hotter. This is due to the way the intake manifold dumps air right in the center. It's no big deal but if you want to even the temps out Banks sells a intake that directs the air flow evenly to all cylinders. Forget what they call it, but it does look nice, at a price.

 

[Howard Durand]

The Banks intake manifold is called the " Twin Ram" and is an interesting installation project.



It also messes up the mounting if you have already installed the Prime Loc fuel filter relocator.

 

[HoleshotHolset]

I was wondering if Banks "Twin Ram" intake would interfere with the fuel filter relocating kit... . I guess that solves that issue.

Personally, I'd rather have the relocating kit.....

With the "Twin Ram" intake I'm assuming they give you a second intake heater grid, or do you just use one still?? Banks' intake looks like two stock intakes bolted to the cylinder head to spread the incoming air out a little... . the OEM intake has the grid under it... that's why I'm wondering.



Wow! It's early!

Matt

 

[illflem]

Matt, your truck has two heaters stock, one on top of the other. The twin ram spreads and separates them, just like in like a bra ad.

 

[Howard Durand]

I made my own mount for the filter relocator but I do believe that Prime Loc now makes a mounting bracket that will work with the Twin Ram.

 

[HerbW]

Check out TST website!

TST site has full instructions with picture included. Also the D. I. S. site has info also. My new probe uses a smaller new type probe from TST that is only 1/8 x 27 tpi. You may want to decide what probe you use before tapping unless you don't mind using a spacer for a smaller probe. HerbW

 

[HoleshotHolset]

Bra ad, eh? Most of the ones I see tend to push things together and higher... . false advertisement if you ask me.

As for the intake heater grid... . I didn't realize I had two of 'em. That's good news, actually... . I may just have to take a closer look at the twin ram setup on someone's truck. I like the idea of my intake air being evenly separated between the cylinders instead of just dumping it into one spot where it is most convenient.

I'm thinking having an 1/8-27NPT hole in my exhaust is better than having a larger one... . not to mention... the smaller the probe... the less restriction. (nit picky-but every little bit helps)



Matt

 

[illflem]

Another thing good about a 1/8" port is that in the unlikely event that you mess up you can drill it out to 1/4". A Banks salesman told me the Twin Ram does little to improve engine performance but contributes to engine longevity. I'm not sure this matters much on an engine that's already good for 500k when stock.

 

[Steve Campbell]

Illflem, could you expand on the engine longevity aspect of the twin ram please?

 

[HoleshotHolset]

Engine longevity can be increased on any engine when it is getting even air distribution to all of its cylinders. The B5. 9L in the Dodge (and a lot of other applications... ) has very uneven intake air distribution leading to a few cylinders with a bit of an improper air/fuel ratio... . luckily, diesels don't suffer from the same types of BAD things that happen to gas engines when they run lean.

I'm willing to bet that on a heavily modified truck... . this 'Twin Ram' setup will improve performance greatly, but for a stock truck with stock cam plate/pump specs/injectors, it is not really needed.

I agree with you illflem, I'm thinking that I'll go with the 1/8" probe... granted I can find one for a similar price that the 1/4" units sell for.



Matt