Highest EGT temp for cruising....
11-03-06 | 12:31 AM
#1
Passenger
Posts: n/a
Highest EGT temp for cruising....
under steady cruising on the freeway i was getting 1400° but what is the hotest i can get that under vacume steady cruising ? i know 14:1 is cool but what is that in egts? i have Rotary Avaition Super seals that are nitrate coated: see here for more details:
https://www.rx7club.com/wolf-3d-125/my-tuning-424453/page5/
https://www.rx7club.com/wolf-3d-125/my-tuning-424453/page5/
11-15-06 | 06:45 PM
#2
Hey, I have the same kinda question and never got a straight answer. I was looking for what a safe range is for an ITS race car and all I got was some guy seid 1560 was a little hot for comfort and other telling me to bring it to them....not much help.
11-16-06 | 12:38 AM
#4
Passenger
Posts: n/a
Well i sent off an e-mail to Rotary avaition with the same question and they had a very good answer but it was more geared toward airplaine rotarys with no turbo.... here is a copy of what i wrote to them and their responce:
Hello Laura,
I have a set of your superseals in my engine with the exception of a single classic seal in my front housing (due to your back order and me wanting my engine done) and I am about to start tuning leaner for better gas mileage. I am going to tune to around 14:1 AFR but I need to dial in the timing as well, my question to you is about the temperature the seals can handle under cruising / no-load / vacuum.
under steady cruising on the freeway I was getting 1400° EGT's but what is the hotest i can get these seals safely without causing dammage in EGT's for steady cruising ? see here for more details:
https://www.rx7club.com/showthread.php?t=424453&page=5
Thanks in advance,
Jeremy
ps. no rush on the answer if you have to look into it, i prefer accuracy over rush.
Their responce .................................................. ......................................
Hi Jeremy - this is not an easy answer. We regularly run the EGT of the 2nd gen engine up to 1800 degrees on take off (aircraft application, obviously) with no problems. Under light load conditions, we use as much as 36 degrees of ignition advance but under FULL load the advance backs down to about 24 to 26 degrees BTDC. The real problem with answering the question is that peak combustion chamber temps do NOT necessarily track with peak EGT temps. For example, under detonation the EGT can actually go lower while the peak chamber temps go off the chart. You didn't say whether you have a turbo or non-turbo engine but in non-turbo applications, we normally run the EGT at about 100 degrees on the LEAN side of peak. At light loads, we have not found any mixture that will cause damage to the seals so we normally run a lean mixture to get best economy.
Our approximate AF ratio under there conditions is about 16:1 at 5000 rpm or more. Things will be a little different at the lower RPM cruising in a car. Cruise EGT is usually 1450 in the plane at economy cruise (6 gph).
We followed the link to the forum but couldn't determine which post was yours.
(This was dictated by Tracy and typed by me.. I'm not this knowledgeable )
Hope this helps and let us know how it all works out for you,
Laura Crook
Real World Solutions, Inc
Home of "RA" Classic and Super Seals
www.rotaryaviation.com
386-935-2973 voice
386-935-4894 fax
.................................................. ........................................
Very excellent responce in my book, major points from me........ good info.
Hello Laura,
I have a set of your superseals in my engine with the exception of a single classic seal in my front housing (due to your back order and me wanting my engine done) and I am about to start tuning leaner for better gas mileage. I am going to tune to around 14:1 AFR but I need to dial in the timing as well, my question to you is about the temperature the seals can handle under cruising / no-load / vacuum.
under steady cruising on the freeway I was getting 1400° EGT's but what is the hotest i can get these seals safely without causing dammage in EGT's for steady cruising ? see here for more details:
https://www.rx7club.com/showthread.php?t=424453&page=5
Thanks in advance,
Jeremy
ps. no rush on the answer if you have to look into it, i prefer accuracy over rush.
Their responce .................................................. ......................................
Hi Jeremy - this is not an easy answer. We regularly run the EGT of the 2nd gen engine up to 1800 degrees on take off (aircraft application, obviously) with no problems. Under light load conditions, we use as much as 36 degrees of ignition advance but under FULL load the advance backs down to about 24 to 26 degrees BTDC. The real problem with answering the question is that peak combustion chamber temps do NOT necessarily track with peak EGT temps. For example, under detonation the EGT can actually go lower while the peak chamber temps go off the chart. You didn't say whether you have a turbo or non-turbo engine but in non-turbo applications, we normally run the EGT at about 100 degrees on the LEAN side of peak. At light loads, we have not found any mixture that will cause damage to the seals so we normally run a lean mixture to get best economy.
Our approximate AF ratio under there conditions is about 16:1 at 5000 rpm or more. Things will be a little different at the lower RPM cruising in a car. Cruise EGT is usually 1450 in the plane at economy cruise (6 gph).
We followed the link to the forum but couldn't determine which post was yours.
(This was dictated by Tracy and typed by me.. I'm not this knowledgeable )
Hope this helps and let us know how it all works out for you,
Laura Crook
Real World Solutions, Inc
Home of "RA" Classic and Super Seals
www.rotaryaviation.com
386-935-2973 voice
386-935-4894 fax
.................................................. ........................................
Very excellent responce in my book, major points from me........ good info.
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