henrik
New Member
Joined: January 2014
Posts: 3 
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Post by henrik on Jan 28, 2016 15:38:49 GMT -5
hello i'm a little curious about what type of oil tu run my jet on. my oil pump take so much power from the batteries . so i started thinking about running a thinner oil. i have 15w40 i the tank now. oil pump is a marco up12 and oil preassure at 40 psi i have two 12v 75ah batteries but the voltage drops rapidly .  |
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Post by smithy1 on Jan 28, 2016 16:46:13 GMT -5
Hi Henrik,
Those batteries should be plenty of capacity for your engine, even one should be enough. Running thinner oil will possibly result in lower oil pressure, not a good thing. 15w40 oil should be fine. Are you sure the batteries are draining or is there just a voltage drop while the engine is running?? Can you do a voltage reading when the engine is running? Does the voltage recover back to 12.x volts when the engine is stopped.? Running all the accessories at the same time can indeed cause a voltage drop.
I had similar issues with my setup, I was using one normal 12v car battery, with all the accessories, pumps, igniters etc running the voltage was dropping close to ~11v. When stopped the voltage would then recover back to ~12.5v. I now have two 13.2v 8400mah Li-Fe batteries running in parallel.
There are racing car batteries available which have a nominal 16v....I might look into this myself.
Cheers,
Smithy.
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henrik
New Member
Joined: January 2014
Posts: 3
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Post by henrik on Jan 29, 2016 9:54:32 GMT -5
okay then i stick with the 15w40 .
i put two candles under the oiltank today when i tests started it and it made a huge difference .
the oilpump ran easier and the engine started much easier
so i think i´m gonna put a heater in the oiltank before next start attemt
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Post by Johansson on Jan 29, 2016 14:30:04 GMT -5
Hi Henrik!
I run regular semi-syntetic 10W40, same oil that I run my cars on so nothing fancy.
Cheers!
/Anders
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Post by smithy1 on Jan 29, 2016 14:52:21 GMT -5
Hi Henrik,
What turbo are you using? Also what are you using to start it? The turbo might have a high loading on the thrust bearing with oil pressure applied. Does the rotor turn freely by hand when oil pump is on? Is it possible for you to lower the oil pressure until the engine is running?
During running we need to keep a good oil pressure, ~45-50psi+ when warm. Maybe a higher pressure/capacity pump, then you could possibly use lower viscosity oil.
Cheers,
Smithy.
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Post by smithy1 on Jan 29, 2016 14:58:20 GMT -5
Hi Henrik! I run regular semi-syntetic 10W40, same oil that I run my cars on so nothing fancy. Cheers! /Anders Same here Anders, nothing fancy, although I use a fully synthetic 5w40 in the "Beast". I've only changed the oil once since John had it.  It's still clean and a good colour. @ Henrik, maybe you could try some 5w40 in your engine, it may help during starting in colder weather. Cheers, Smithy. |
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Post by smithy1 on Jan 29, 2016 15:00:54 GMT -5
okay then i stick with the 15w40 . i put two candles under the oiltank today when i tests started it and it made a huge difference . the oilpump ran easier and the engine started much easier so i think i´m gonna put a heater in the oiltank before next start attemt A heater in the oil tank is also a good idea. I forget about the cold weather in the northern hemisphere. Cheers, Smithy. |
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Post by racket on Jan 29, 2016 16:32:55 GMT -5
I contemplated fitting a 12 volt camping heater element into my oil tank on the bike , the heating elements are nice and compact , made to heat a mug of water to make a brew..................LOL, I've still got it somewhere amongst the pile of unused/scrapped/replaced bits that seem to clutter my sheds storage space .
A small electric room heater blower can warm up an entire engine and oil system pretty quickly if the hot air is blown under a blanket covering the entire engine .
Smithy , you've changed the oil already .................you're spoiling that girl ;-)
Cheers
John
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Post by smithy1 on Jan 30, 2016 16:49:14 GMT -5
Smithy , you've changed the oil already .................you're spoiling that girl ;-) Cheers John Only because I didn't know what was in it to start with... Cheers, Smithy. |
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Post by racket on Jan 30, 2016 18:18:50 GMT -5
Hi Smithy
She had Nulon 5W-40 100% synthetic , I drained it out of the test stand's oil tank after the 10/98 engine build finished, I decided on the thinner 5W-40 because of the colder weather in the mountains, have now gone to a Penrite 5W-40 100% synthetic for the 12/118 as my local supplier here doesn't carry the Nulon range of engine oils , only the heavier gearbox/diff oils.
I've still got 3 litres of the Nulon but am a tad wary of mixing it with the Penrite as I'm not sure about any possible "problems" from mixing different brands of synthetics,...........advice welcome.
Cheers
John
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Post by Johansson on Jan 31, 2016 13:23:41 GMT -5
hello i'm a little curious about what type of oil tu run my jet on. my oil pump take so much power from the batteries . so i started thinking about running a thinner oil. i have 15w40 i the tank now. oil pump is a marco up12 and oil preassure at 40 psi i have two 12v 75ah batteries but the voltage drops rapidly . Are you planning to race the jetkick at Speed Weekend in Årsunda this year? |
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Post by smithy1 on Jan 31, 2016 13:53:39 GMT -5
Hi Smithy She had Nulon 5W-40 100% synthetic , I drained it out of the test stand's oil tank after the 10/98 engine build finished, I decided on the thinner 5W-40 because of the colder weather in the mountains, have now gone to a Penrite 5W-40 100% synthetic for the 12/118 as my local supplier here doesn't carry the Nulon range of engine oils , only the heavier gearbox/diff oils. I've still got 3 litres of the Nulon but am a tad wary of mixing it with the Penrite as I'm not sure about any possible "problems" from mixing different brands of synthetics,...........advice welcome. Cheers John They should be fine to mix John since they're both 100% synth and same viscosity etc....Both Penrite and Nulon are Australian...it's even possible they were both made in the same place..! Cheers, Smithy. |
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Post by Johansson on Jan 31, 2016 14:06:34 GMT -5
It is an interesting topic actually, is there anything to gain by changing from a regular 10W40 semi syntetic to a fully syntetic 5W40 oil when running in 15-20°C temps?
I mean once the engine is running, I assume starting will be a tad easier with a lower viscosity oil.
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Post by racket on Jan 31, 2016 22:16:38 GMT -5
Thanks Smithy , will add when necessary .
Anders , the 5W will possibly give easier starting and maybe a bit better flow with cold oil , but no difference once warmed.
Full synthetic will have the advantage at very high oil temps , temps we shouldn't be using in reality , I only ever used semi synthetic in the TV84 engine , I think it was 15W-50 to improve high oil temp pressure .
Cheers
John
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Post by smithy1 on Feb 1, 2016 14:10:38 GMT -5
Anders, as you're probably aware you can get wide ranging vicosity oils, I've seen 0w40 and 10w60 from Nulon, they make a fine range of synthetic oils, here: www.nulon.com.au/products/Full_Synthetic_Engine_OilsI suspect other manufacturers also do something similar. The 10w60 Full Synthetic might be a good option for our application and the "60" part of it should hold oil pressure well to higher oil temps. As John says, synthetic oils can handle higher temps very well....but I believe we should be keeping our oil temps under control. An oil cooler or fuel/oil cooling system should be used if we run our turbines for prolonged periods. I've found the addition of an oil cooler to the Beast has greatly reduced the oil temps during running, I rarely see more than ~70c even after several runs during the day, prior to fitting the cooler the temps were getting to "eyebrow raising" levels, now I can forget about the oil and try to concentrate on other things. Cheers, Smithy. |
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It's still clean and a good colour.