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Post by solo2racr on Dec 1, 2008 11:29:31 GMT -5
I guess I have to ask this question as well. If someone finds that their engine is running hotter or cooler than what is ideal (whatever that number is), how would one go about changing that? Not enough oil gets up to the rocker box to really effect the CHT. Weld on more/bigger fins? Or if the opposite is true, start cutting fins off? It seems like it's going to run at whatever temp it wants to. Buy the time you would see a increase in CHT or oil temp, it would probably be to late to avoid damage. Unlike alot of air cooled aircraft, there is no way to adjust the air flow to the engine.
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Post by aero on Dec 1, 2008 11:45:18 GMT -5
Only thing I ever remeber CHT showed up was over advanced igntiton timing. You got a definate increase in temp under load with timing that was out. I always thought the point of a temperature gauge was on water cooled engines so you could pull over before the radiator burst if it started to over heat. Oil temp would be more useful, but so as to see when its warmed up enough to give it a good thrashing  |
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Post by caferacercarl on Dec 2, 2008 23:50:40 GMT -5
Yes,the roadracer I did had to get to 70c oil temp before I would let the rider go out and it would idle on stands with the tyre warmers on for ages, good on you aero!
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Post by colinjay on Dec 3, 2008 1:36:09 GMT -5
I will side with Aero and Carl on this one.
On my Salt Racer, I have replaced the sump drain plug with an electric temp sensor. This feed a digital temperature display mounted in the fairing. I have alway thought that the oil temp in the engine gave a better indication that the temperature in the oil tank. Although I still have not had a chance to run the bike in anger, I have always let the engine warm up to 60 - 70 degree C, before giving it a squirt down my driveway. The highest temp that I have seen was mid 90's when it was being run on the dyno in January.
There must be some thing to it as you will find that F1, NASCAR, INDY and even the AUS V8 Supercar teams all warm up the oil they use to to up engines with during long races, and the FI guys even pre heat the engine oil before they start their engines.
CJ
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THUMPS
Junior Member
THUMPS, ridden by Dave
Posts: 92
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Post by THUMPS on Dec 3, 2008 9:03:47 GMT -5
maybe I should be measuring oil temperature rather than CHT. Thanks
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Post by solo2racr on Dec 3, 2008 11:31:27 GMT -5
maybe I should be measuring oil temperature rather than CHT. Thanks I would. By the time either CHT or oil temp will let you know about anything bad happening, it would be to late. I'm not sure why the F1 guys pre-heat their oil (unless it's such a high viscosity at a ambient temp, it wouldn't flow) But as for the rest that warm-up their engines first and gauge that warm-up by oil temp, it lets them know that the engine parts have gotten up to a suitable operating temp before they place a load on it. Also, thinner oil will make for more power. That's why you'll find many racing synthetics with a very low viscosity rating. Same reason I use to run ATF in the gearbox of my old RD350 |
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Post by caferacercarl on Dec 10, 2008 0:40:16 GMT -5
Colin, you have a salt racer... holding out on us... how fast has it recorded? I am part of an effort for a salt SR with the guy [ who works at parramatta] who actually builds the custom bikes found in camperdown [if you get my drift] and they might even get their sticker on it if they are quick. as to the F1 stuff they bore the blocks at operating temp and the piston clearance is very tight, the warmed up zerow/ full synth is warmed up so the whole thing is at the right temp re clearances etc, then they rev the bollocks off them, ATF is a great 2 stroke box oil and a good 15w fork oil to boot as well, cheers guys
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Post by wotavidone on Dec 10, 2008 0:56:34 GMT -5
Colin put a pic of his salt racer in the thread about building the fibreglass seats from scratch.
I put a couple of pics of it in the thread about the TT/XT 500 Muster.
I can vouch that the seat looks "better than a bought one" as we say in the bush.
Seriously, the whole bike exhibits some very nice workmanship. Including an 18" cast alloy wheel on the front that you have to know what you are looking at to know its not a 19" original. A very nice bike. Love to see it with a muffler and registration - it'd give a few sports bikes a fright in the twisty stuff.
Mick
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Post by colinjay on Dec 10, 2008 5:48:39 GMT -5
Carl,
So far I have not been able to run it on the "Big White Dyno", as the last two events have been cancelled/postponed due to the lake being to wet, so I don't know how quick it will go. If you had of made it down to the rally last month you could have had a first hand look at the orange beast, and joined the watch crowd as I wore my self out trying to get it to start. I would have been good to catch up with you again as well.
From what I read in the DLRA newsletter that I got in the mail today, thinks are not looking to promising for 2009, as the DLRA is having trouble getting the required Induigenous Land Use Agreement from the traditional aboriginal owners and government. I will be a utter shame if the event doesn't go ahead in 2009 due to government indifference and red tap. Although having said that, it is currently pissing down with rain throughout the northern areas of SA and this does not bode well for Lake Gairdiner being dry enough to run the speed trials in March 2009. If any one out there in SR land wants to support the DLRA,s efforts in getting the government to get off there arse, the is a letter on the DLRA forum (www.dlra.org.au/forum) that you can down load and post to the Hon Jay Weathrill MP, who it seams is the minister for everything, including not doing anything about helping the DLRA get the required permit.
If speed week does go ahead in March, I might not be able to get there due to work, as it falls in the middle of "vintage" which is the busiest time of year at the winery. If I can't get up to the lake, I will probably lend the bike to my best mate and let him take it up for a run.
CJ
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Post by StewRoss on Dec 11, 2008 4:06:46 GMT -5
Col, You might be there with us in 2010! SR |
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Post by wotavidone on Dec 11, 2008 18:50:49 GMT -5
Don't count on speed week 2009, lads. Its been bucketing down up north since early yesterday morning. I would say the odds of the lake filling up are looking pretty good. We've had about a third of our annual rainfall in a day and a bit.
That's the flaming trouble with this country, its either drier than a lime burner's boot or p@#%ing down.
Mick
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Post by wotavidone on Dec 11, 2008 23:47:46 GMT -5
Reminds me of the reply I got from a mate, when I was grizzling about the weather.
"Geez", I said, "its drier than a dead dingo's donger, I wonder what its like to live somewhere where the creeks always have water running in them?"
The reply was" Mate, I've lived somewhere like that, and its OK, but its always flamin' raining"
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