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.
Thread: Exhaust temp
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01-23-2010 05:30 PM
Last edited by mbam; 01-23-2010 at 06:32 PM.
Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-23-2010 06:10 PMJudging 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...
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01-23-2010 06:35 PM
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.Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-23-2010 06:36 PM
PS - we went through a lot of fuel testiing. This was in the basement of the Marina City building in Chicago.
Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-24-2010 10:59 AM
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.Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-24-2010 11:08 AM
was that Tom Orsenos /Pro Marine dyno ?? he showed me that pic a few years ago when he was dynoing the SORCEROR power plants
ROCK ON !!!!!!!!!!!!!!!!!!!!!!!
ITS A SKATER NATION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
DRYDEN PERFORMANCE MARINE 302-367-4962
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01-24-2010 12:09 PM
No, that was my dyno at the marina - back in the day!!
Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-25-2010 12:54 PM
Did not change the actual EGT much, but yes the headers cooled down a bit.
Marc
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01-25-2010 12:58 PM[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
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01-25-2010 01:48 PM
Exactly!
Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-25-2010 02:51 PM
Hey Marc, that pic's my screen saver!
Most that have seen it think it's a Photoshop!
Kurt
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01-25-2010 03:21 PM
Kurt (or anyone else) I have a high resolution scan of the original negative if anyone wants it.
Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-25-2010 04:12 PM
What would be ideal EGT at the collector/risor joint fro a N/A BBC?
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01-25-2010 06:13 PM
Sorry, not sure, I never measured it there. Maybe one of the other engine builders on board can answer.
Marc
www.go-fast.com, www.MercruiserParts.com,www.CyborgTransmissions.com,and coming soon - BamBoatGear.com
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01-26-2010 03:43 PM
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
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01-29-2010 01:28 PMHeh 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