Exhaust temp

[mbam]

I was talking to someone recently about EGT's and promised I would find this picture.

If I could only remember who it was.

In any case this was taken back in the early 90's when I first did a pair of blower motors. Fresh water cooled, 89 octane. Made some good power.

We were not shy about holding the throttle down.

[Chris]

Judging from the cherry red glow all the way back on those exhausts, this must have been the 100-hour endurance test :)

Were they Fords? I notice the valve covers...

[mbam]

Nope, big block. Can't remember who made the valve covers, they were angled to clear the headers in the boat.

The dyno headers started out pointing straight back, they sagged after they got orange!

I had CMI make me a set of stainless dyno headers after that.

[mbam]

PS - we went through a lot of fuel testiing. This was in the basement of the Marina City building in Chicago.

[Geronimo36]

cool!

[Ratickle]

cool!

No, needs cooled.......


Damn Mark, running a little lean????

[mbam]

Actually it was pretty fat, took 6 jet sizes out after that picture!! This was after 10 minutes or so at full throttle, then the dyno water got too hot.

If it won't do it on the dyno it sure as heck won't run very long in the boat.

[runninhotracing]

was that Tom Orsenos /Pro Marine dyno ?? he showed me that pic a few years ago when he was dynoing the SORCEROR power plants

[mbam]

No, that was my dyno at the marina - back in the day!!

[MILICEVICGM]

I was talking to someone recently about EGT's and promised I would find this picture.

If I could only remember who it was.

In any case this was taken back in the early 90's when I first did a pair of blower motors. Fresh water cooled, 89 octane. Made some good power.

We were not shy about holding the throttle down.



We were there. You did impress us like always.

[Geronimo36]

Actually it was pretty fat, took 6 jet sizes out after that picture!! This was after 10 minutes or so at full throttle, then the dyno water got too hot.

If it won't do it on the dyno it sure as heck won't run very long in the boat.

Cool!!! When you put smaller jets did the headers cool down a little?

[mbam]

Did not change the actual EGT much, but yes the headers cooled down a bit.

[jrz]

[QUOTE=mbam;422729]Nope, big block. Can't remember who made the valve covers, they were angled to clear the headers in the boat.


B&M

[mbam]

Exactly!

[Biggus]

Hey Marc, that pic's my screen saver! :sifone:

Most that have seen it think it's a Photoshop!:cheers2:

Kurt

[mbam]

Kurt (or anyone else) I have a high resolution scan of the original negative if anyone wants it.

[Underdog88]

What would be ideal EGT at the collector/risor joint fro a N/A BBC?

[mbam]

Sorry, not sure, I never measured it there. Maybe one of the other engine builders on board can answer.

[Bradz]

Marc that is wild!!

That reminded me of a Youtube video of a F1 car with glowing headers.
Almost white hot.

http://www.youtube.com/watch?v=jphHySZnnPo

[Raylar]

Heh Mark:

Pretty cool picture there. Thats a pretty serious sustained pull there , was it a water brake? Wow, if it was it was taking a beating for sure!
My guess would be EGT's were probably about 1400-1450 for that engine to even last 10 minutes any higher that that and the engine would be melting down.
The red glow and overheat in the exhaust system is obviously caused by the heat soak buildup after that type of pull time and I've even seen stainless systems start to do that on sustained load tests. Its obviously also not a good idea to be in the room when this is go'in on, kinda like juggeling handgrenades with the pins loose!

Cool Pic and Post Mark, Happy New Year and best of luck to you in 2010!

Best Regards,
Ray @ Raylar

[mbam]

Ray, Stuska water brake, big Berkely pump, 1500 gal water tank, 1" pipe feeding cold water to the tank.

Uh- there is no other room, the dyno was set up outside the repair shop in the Marina. I always figured the loose parts would fly out sideways and we were in front !