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an RX8er's rebuild thread

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Old 12-13-2012 | 11:03 PM
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Old 12-14-2012 | 08:03 AM
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what was I thinking
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damn I knew someone heard me...I'll have to be quieter next time.
Old 12-14-2012 | 08:10 AM
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Old 12-14-2012 | 09:24 AM
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yall are always up to something....
what would yall think on a single component for better cooling of the coolant and oil?
Old 12-14-2012 | 09:40 AM
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I have thought long and hard about a water to oil heat exchanger. It may help the oil get up to temp a bit more soon and keep things on an even keel.
Old 12-14-2012 | 10:15 AM
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Oil temps have been a non issue for me with my current setup. I am actually of the opinion that the stock coolers with custom lines (or modified Racing Beat overpriced lines) with the stock thermostats removed and a proper oil thermostat installed is the way to go. I am basically running that now and I really have to struggle to get my oil temps above 210F and that is with the turbo adding heat to the coolant and the oil.

I'm still on the fence about secondary radiators, my coolant temps are great but every once in while when the ambient temps are in the 100F range it gets heat soaked it takes some cruise time to cool down to normal because the turbo is adding so much heat to it. The fan on my secondary radiator is pointless, it does nothing to drop temps any quicker.
Old 12-14-2012 | 10:31 AM
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my oil was only 135 when I got to work today ...I love how my electronic gauges actually work
Old 12-14-2012 | 10:53 AM
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The reason I asked is that two respected builders have said to not let this engine get oil temps over 200F from the engine for any length of time. They are talking about DD stuff--not on the track--canyon running or going to the latest release of Batman......
Heck Rick at Mazmart even showed me the critical areas within the engine that he thought would be affect by consistent oil temps of 200F+ --the front bearing and stationary gears--not so much the rotor bearings or e shaft. He thinks that it has an affect on the longevity of the engine.
The other builder is Racing Beat and their tech papers: "Oil temperature is critical in rotary engines. Oil temperature entering the engine should never be allowed to exceed 205°F." is a direct quote from them.
Since most of us measure on the cool side--i do wonder what the delta in between the temps at engine exit and the post coolers?
I know most people in Ga are seeing right at ot a little more than 200F post oil coolers.
IDK--what do yall think?
By the way I finally glued the horn on the bull--he started looking kinda pitifull with just one horn--his eys would follow me across the room......
Old 12-14-2012 | 11:30 AM
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I think it depends on the oil used and it's condition but from what I have read, you actually want the oil to be in the 200F range if you are driving hard. I (and Grungepups stock 8 for a comparison) used to measure oil temps in the pan and honestly we never saw a huge difference in temps so I went back to reading it at the oil filter adapter. I do plan on comparing the data once shady gets his Corksport sensor adapter installed at the factory banjo fitting.

I definitely think excessive oil temps and inferior oil that is allowed to get broken down is a bad thing for longevity. But it's overall temps for both the coolant and oil that are really important as well as allowing enough time to cool down before hitting it hard again because heat soak is a bitch. Houstonrx8er hit the track recently at the Corksport event we attended, I'm not sure what temps he was seeing, it was a pretty warm day.


I'm glad you got the bull fixed and have a piece of Texas in your home
Old 12-14-2012 | 01:34 PM
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Originally Posted by 9krpmrx8
I think it depends on the oil used and it's condition but from what I have read, you actually want the oil to be in the 200F range if you are driving hard. I (and Grungepups stock 8 for a comparison) used to measure oil temps in the pan and honestly we never saw a huge difference in temps so I went back to reading it at the oil filter adapter. I do plan on comparing the data once shady gets his Corksport sensor adapter installed at the factory banjo fitting.

I definitely think excessive oil temps and inferior oil that is allowed to get broken down is a bad thing for longevity. But it's overall temps for both the coolant and oil that are really important as well as allowing enough time to cool down before hitting it hard again because heat soak is a bitch. Houstonrx8er hit the track recently at the Corksport event we attended, I'm not sure what temps he was seeing, it was a pretty warm day.


I'm glad you got the bull fixed and have a piece of Texas in your home
I saw high coolants temps but the manual oil temp gauge was reading radiant heat from the mainifold ...thats why I changed to electronic gauges and added a shroud
Old 12-14-2012 | 05:45 PM
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I hear you---but I wonder why these builders say this?
Old 12-14-2012 | 05:55 PM
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Originally Posted by olddragger
I hear you---but I wonder why these builders say this?
Builders say allot of things....

Unless I see it first hand I dont listen to squat.
Old 12-14-2012 | 06:07 PM
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Some of them having been saying it for decades without consideration for the Renesis in particular, some builders compensate for it with clearances. The issue at hand is when you build an engine you are trying to half-*** piece together what you have heard, read, guessed at, and likely f'd up on as a result.
An engine builder like Daryll Drummond likely has 100+ Renesis race engines to his credit. If you think having an engine show up at your doorstep in a sealed container broken in with a dyno sheet doesn't have value then you are even dumber than I claim you are.

Ps: I didn't have to hear what I already knew for a fact before you even started, it's called experience


.
Old 12-14-2012 | 07:28 PM
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I just followed the instructions (mazda has some really good ones )....1 exception...stupid Atkins seals.....I bought into the gossip about cryo treatment and have since learned my lesson. I don't argue for 1 sec that Daryll's engine is, to some degree, built better than mine....I don't have 100+ engine builds..... doesn't mean with a little learning and opening dialogue (with ppl like Charles, Rob and ppl like you on the forum) one cant accomplish a successful build
Old 12-14-2012 | 09:31 PM
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Originally Posted by TeamRX8
Some of them having been saying it for decades without consideration for the Renesis in particular, some builders compensate for it with clearances. The issue at hand is when you build an engine you are trying to half-*** piece together what you have heard, read, guessed at, and likely f'd up on as a result.
An engine builder like Daryll Drummond likely has 100+ Renesis race engines to his credit. If you think having an engine show up at your doorstep in a sealed container broken in with a dyno sheet doesn't have value then you are even dumber than I claim you are.

Ps: I didn't have to hear what I already knew for a fact before you even started, it's called experience


.
I don't understand the point you are trying to make here... Then again I seldom understand anything you say, you are just on a whole other level man.
Old 12-16-2012 | 10:50 AM
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well one side of the battery relocation is complete (I wont get the battery till Christmas (I think)

Working on the front side today
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Old 12-16-2012 | 11:15 AM
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sweet!
Old 12-16-2012 | 11:32 AM
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What strut bar is that?
Old 12-16-2012 | 11:47 AM
  #1669  
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gtspec
Old 12-18-2012 | 09:43 PM
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its nice to have my sunroof back
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Old 12-18-2012 | 09:45 PM
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Awesome man. The battery switch is a nice touch. I'm jelly. I would suffer bad without my sunroof.
Old 12-18-2012 | 11:14 PM
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Sunroofs are for pussies, go get some boost.
Old 12-19-2012 | 07:36 AM
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I am working on it but its a slow process to do right (I am building a project plan like yours...........If I am going to carry unnecessary weight it better at least function

next time I am cutting weight and visqueening the opening closed
Old 12-19-2012 | 09:37 AM
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Old 12-19-2012 | 09:47 AM
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Originally Posted by 9krpmrx8
Awesome man. The battery switch is a nice touch. I'm jelly. I would suffer bad without my sunroof.
I wish I had a sunroof


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