Hey guys I recently Pmed supracentral this question (big nono, my bad)
To which he replied
I read the threads that supracentral suggested and i cant believe how wrong i was with oil selection. i don't know what i read or where but i thought i had done my homework. The oils i have used so far in the car have been Penrite running in oil 15w40 for the first 500km and then oil and filter change to Penrite HPR10 10w50 semi synthetic motor oil currently at 800km since changing to this oil.
i read somewhere in one of those above listed posts that the 7m was designed to run oil at 10-12 cst at operating temps. considering the hpr10 has a cst of 19@100c i think i have chosen the wrong oil. Worse still the Penrite sin10 fully synthetic oil i was going to put into the engine in another 1200km is a 10w70 with a cst of 30.1@100c
What an epic fail. i think i somehow got sucked into this thing about the "extra 10" bull on the advertising for the penrite oils and being told that the extra viscosity at high temps would "protect" the engine. Hmm i was wrong. Also i don't understand why the bottles are allowed to specify that they meet the requirements for cars running lower viscosities when the cst figures are in actual fact to high. the back of the hpr 10 bottle states "HPR10 is designed to out perform and exceed manufacturers requirements in the latest generation conventional, turbocharged and supercharged petrol engines where SAE 10w-30 10w-40 and 10w-50, grades are specified in the owners handbook" which is what i was looking at when i bought the oil.
So what i need to know now is.
1 is it too late to change to a good 0w30 or 10w30 oil.
2 Will this help to reduce the massive temperatures im getting
3 Im also running a proflow reuseable stainless steel filter since changing to the hpr10, is this a bad thing should i be using good quality paper filters instead.
Some other things u might need to know before answering are, the shim in the relief valve of the oil pump is 8mm and the engineer increased the clearances on my bearing journals to .0025inches for "high rpm oil flow". Also that i live in sunny Queensland Australia if thats going to affect the oils i need i don't know
Hope this all contributes in some meaningful way. thanks guys
Beefy_Heafy said:Hey supracentral. Ive been lurking around for a while looking for a post that specifies acceptable coolant and oil temps for the 7m to be running at. Ive had not much success in my searches so i thought that you would most probably know. Ive recently finished building up the 7m-gteu in my Turbo A it seems to be running really well but i am concerned what maximum acceptable temperatures would be before i go and give myself a bhg from a cooling system issue. Im running a 13row oil cooler and big braided lines as well as a large alloy radiator and a good quality red coolant. i have a lower temp thermostat and have shimmed the relief valve in the oil pump but not the relief valve for the oil cooler (although i probably should). Normal town driving temperature for coolant sits at 85c and oil at about 80c according to my electronic gauges. however under hard uphill mountain driving this comes up to 120c for coolant and 110c for oil and still climbing (i didn't want to bust anything so i backed off) im not really sure what kind of temperatures are good and bad since i have only ever driven cars with standard gauges and the standard coolant gauge in my supra isn't connected. also at these higher temperatures my oil pressure drops from 3bar @ 3000rpm (normal driving temp) to about 2.3bar @ 3000rpm. is this bad? im using a 10w50 weight semi synthetic oil until my run in is complete then i will swap to 10w70 fully synthetic.
sorry for the long ass message. im a bit anal about these things and want to make sure im not doing anything stupid. i hope this doesn't bother u too much and that i haven't missed the answer to this question elsewhere.
Thanks
Tom
To which he replied
Supracentral said:I have a rule about not answering tech questions via PM (it's in my sig) but what you've written concerns me so much I'll reply. But please take it to the appropriate forum after this. (See below)
Beefy_Heafy said:however under hard uphill mountain driving this comes up to 120c for coolant and 110c for oil and still climbing
Way too hot. You really shouldn't see more than about 110 for coolant in my experience.
Beefy_Heafy said:(i didn't want to bust anything so i backed off)
Smart move. Do you have a Pyrometer? (Exhaust Gas Temp Gauge) It's one of the most valuable gauges you can have on a turbo car.
Beefy_Heafy said:also at these higher temperatures my oil pressure drops from 3bar @ 3000rpm (normal driving temp) to about 2.3bar @ 3000rpm.
Pressures are in an acceptable range, but I've got some comments on your oil (see below), but you're definitely seeing a lot of thinning for that much of a difference.
Beefy_Heafy said:is this bad? im using a 10w50 weight semi synthetic oil until my run in is complete then i will swap to 10w70 fully synthetic.
Whoa! Way too thick. Post those weights up in the Motor Oil, Lubricants and Filtration SME forum. I'll guarantee you Jdub tells you the same.
The 10w50 is bad enough, but 10w70 ?!?! IMO that's insane.
Read this:
http://www.supramania.com/forums/sho...l=1#post791825
And this:
http://www.supramania.com/aehaas/
and this:
http://www.supramania.com/forums/showthread.php?t=38768
Unless you've specifically built your motor to handle a 50-70 wt oil, you're going to kill it.
5w30 or 10w30 is the heaviest oil that a 7M needs, unless it's ultra high mileage and is very loose, even then I'd only go to a 10w40. We've got people running 0w20 in these cars without issue...
I'd straighten that out first. The mud you are running probably has so much resistance to flow that you're going to kill you motor.
I read the threads that supracentral suggested and i cant believe how wrong i was with oil selection. i don't know what i read or where but i thought i had done my homework. The oils i have used so far in the car have been Penrite running in oil 15w40 for the first 500km and then oil and filter change to Penrite HPR10 10w50 semi synthetic motor oil currently at 800km since changing to this oil.
i read somewhere in one of those above listed posts that the 7m was designed to run oil at 10-12 cst at operating temps. considering the hpr10 has a cst of 19@100c i think i have chosen the wrong oil. Worse still the Penrite sin10 fully synthetic oil i was going to put into the engine in another 1200km is a 10w70 with a cst of 30.1@100c
What an epic fail. i think i somehow got sucked into this thing about the "extra 10" bull on the advertising for the penrite oils and being told that the extra viscosity at high temps would "protect" the engine. Hmm i was wrong. Also i don't understand why the bottles are allowed to specify that they meet the requirements for cars running lower viscosities when the cst figures are in actual fact to high. the back of the hpr 10 bottle states "HPR10 is designed to out perform and exceed manufacturers requirements in the latest generation conventional, turbocharged and supercharged petrol engines where SAE 10w-30 10w-40 and 10w-50, grades are specified in the owners handbook" which is what i was looking at when i bought the oil.
So what i need to know now is.
1 is it too late to change to a good 0w30 or 10w30 oil.
2 Will this help to reduce the massive temperatures im getting
3 Im also running a proflow reuseable stainless steel filter since changing to the hpr10, is this a bad thing should i be using good quality paper filters instead.
Some other things u might need to know before answering are, the shim in the relief valve of the oil pump is 8mm and the engineer increased the clearances on my bearing journals to .0025inches for "high rpm oil flow". Also that i live in sunny Queensland Australia if thats going to affect the oils i need i don't know
Hope this all contributes in some meaningful way. thanks guys
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