normally aspirated EGTs

[pybyr]

I owned a Dodge CTD at one point in the past, and it was stock; my current N/A idi is my first normally aspirated diesel, and it's stock, so far, too. I've heard mention of needing to watch EGTs in an N/A -- what do you watch for (in terms of appropriate vs. bad temps) and what do you do about it?

Thanks

 

[gonecrazyi]

The normal agreed on temps are around 1200 to 1250 degrees. I don't have a gauge, I just watch the smoke and keep the rpm's up when pulling. I have a gauge, I just havent taken the time to install it.

If you see a lot of smoke when pulling, it is best to back out of the throttle or down shift to get the rpms up. Lugging the motor will cause higher egts and more stress.

 

[crashnzuk]

I think the problem with N/A is that you aren't adding more air with the fuel you are dumping in. If you lug it, or tow in higher elevation, I would think you'd have to watch it.
Travis..

 

[smolkin]

I've had muffler shops tell me that a more open exhaust can raise egt, which makes no sense to me. I see lots of people here with 3-4" open pipes, I have stock 2.5", is there any truth to this?

 

[jperecko]

I believe that it can potentially be the case with gas engines- but not with diesels

 

[FordGuy100]

I've had muffler shops tell me that a more open exhaust can raise egt, which makes no sense to me. I see lots of people here with 3-4" open pipes, I have stock 2.5", is there any truth to this?

Absolutly zero truth to that. The bigger the exhaust, the cooler the EGT's. You get to a certain point where I dont think it makes any difference, say 5"+, I think you wont see any difference, but definatly from the stock exhaust to 3"+

 

[wanabebig]

i've heard for our trucks especially n/a anything over 4 inch will actually not help but hurt the power of the trucks.. don't do an exact quote on me.. i don't know for a fact just what i heard. and i think really 3.5 or 4 inch for us n/a guys is just as good.. and no muffler is good..

 

[Agnem]

Anything over 3.5 inch won't get you any gains, but it won't hurt anything. A stock pump is calibrated to put you in the 1150 to 1200 degree range on a stock engine. Change your fuel, and/or alter your timing, and now your flirting with a potential melt down. Really, smoke is not a fair indicator of EGT's. RPM's have a lot to do with it, as does the amount of time that the condition continues. Get a gauge, and if you have one put it in.

 

[hesutton]

I can tell you my NA 6.9 CC truck will make dangerous EGT's with only a light load (1500lbs) on even modest hills. I have to watch they pyro closely when driving it. On my turbo'ed, moose injected, DPS (maxed out) IP'ed F250, I never ever, see EGT's over 850 to 900 max.

If you have an NA IDI, a pyrometer would be a very important gauge to have in the cab.

Heath

 

[Hyde]

When pulling big hills my truck will hit 1300° pretty quick with no smoke so that isnt exactly a good indicator. I pretty much have to watch the pyro constantly, even a dead run from 0-65 empty will get dangerous.

 

[pybyr]

Where do you folks mount the temperature sensor, and what do you consider to be acceptable temps (max, and ideal)? What do you do to keep temps at acceptable levels, other than to go lighter on the accelerator?

Also, what are suggestions for decent quality but non-premium-priced EGT gauges?

Thanks

 

[Hyde]

I mounted mine in the drivers side exhaust manifold. Acceptable, anything less than max which most say is 1250°. Only way to bring down temps is to give it less fuel, more air, or add water.