EGT location?

[NEW2DMAX]

??Where is the best location for EGT probe - If the manifold before the turbo is the best spot what about the metal shavings from drilling the hole, Will they harm the turbo if so what is a trick to removing them?

[More Power]

Check our Edge Attitude (http://www.thedieselpage.com/reviews/attitude.htm) install for the best location.

I just installed a second pyrometer in Lil Red, in the driver's side exhaust manifold, so I can use a dedicated EGTGauge (http://www.thedieselpage.com/reviews/gauges2005.htm) installation in addition to the Attitude display.

Metal shavings should be small and insignificant if you begin with a small bit, and increment your way up to the desired size in a few steps. An idling engine will also help expell the particles.

The only real concern would be if you broke a bit or tap, then you'd need to remove the manifold to retreive it.

By the way, if the numbers are accurate, the driver's side exhaust runs about 100 degrees warmer than the passenger side.

Jim

[cowboywildbill]

I noticed my drivers side EGT reads higher by about 100 and sometimes 175 degrees also. The driverside guage also seems to respond quicker when nailing it than the right does. If I am cruising and not pulling, the left and right bank read about the same. I have the passenger side probe in the manifold like everyone has been doing. I had put the drivers side one in first, when truck was new. There were no post on where to install it at the time. I drilled a whole in the drivers side pipe about 4 to 6 inches down from the manifold and put it in with a clamp. You would think it would read lower because of being further away from the cylinders. But my guess is it reads higher because of the resriction in the drivers side manifold where the casting narrows. I remmember from an old post that Kennedy had his driver side manifold modfied so that it doesn't have the restriction. I wonder if that makes a difference in the EGT reading. I always wondered if I have an injector issue on one side or the other if I will notice it by different readings in EGT ?

[ 09-02-2005, 06:50 PM: Message edited by: Cowboy Wild Bill ]

[More Power]

I considered the more restrictive driver's side manifold as a potential reason for higher temps.

http://www.thedieselpage.com/features/bdengineer-09c.jpg

The above image is of a new manifold designed by the folks at BD (http://www.bd-power.com).

I took the above photo in April of this year. BD was still a ways off from having production versions ready. Haven't heard from them recently about whether they are ready now or not.

Jim

[Jim Brzozowski]

What reason was behind the reduction in size like that?

[More Power]

Here's my opinion... The engine packaging was originally designed for the GMT-400 classic C/K trucks (1988-98 body style), which is all the packaging engineers had to work with at the time the engine was designed. I believe the driver's side manifold was scalloped to allow more clearance in the area of the steering shaft. I noticed that in Lil Red, somewhat close fit in this 1989 Chevy, but a BD type manifold would still fit fine.

In the 2001+ trucks, there is no reason for the scallop, due to the way the engine sits in the frame (higher - even further away). GM Probably kept the original design because of emissions certification, and the trouble/expense of making a change.

Jim

[cowboywildbill]

I went to the B&D site, but I couldn't find any mention of the exhaust manifold. I would like to get one. Any body know if they have it yet? And How Much$? Thanks.

[ 09-02-2005, 06:49 PM: Message edited by: Cowboy Wild Bill ]