Oil weight and bearing clearances?

[NashMan]

well i am in the mist of doing this right now

i plan to run http://www.amsoil.com/storefront/tro.aspx

but i haven hard time thinking of what bareing cleance's to run and how much you persure will rise once the turbo oil filter monte removed then comes on how much to shim the pump if needed

plan to run -10 lines as well though out



the reson my last bareing got wiped and were to toyota spec's

 

[Doward]

How high you plan on spinning?

If around 7000rpm, I'd go like .0025"-.0028", mains/rods.

 

[NashMan]

650 sustained for now bouch of rev limt wheil side ways or heavy loads

plus hard hitting nos

 

[NashMan]

any one got any comments about this ?????

 

[bluedragon17]

i know nothing about bearing clearances except that basics are you need .003 of clearance for every inch of raceway. but from what ive been told and learned about oils(lube tech) AMS oil is the greatest synthetic out on the market today. Supposedly its been tested against all the other major sythetics and it came out on top above Mobil 1, Royal Purple, Castrol syntec, and Pennzoil synthetic. I had test results somewhere but i cant find them il attempt to locate them but no guarantees

 

[NashMan]

oh it is good oil but i kinda don't like the idea of haven 20 weight oil cold the 50 part is fine mabye if ran acusump this whould fix the issue i don't wana have and that is harsh start up


see IJ is lucky to get 10 60 where he is that nice oil weight for our cars in mine pending if you cleances are up the the weight change

 

[NashMan]

any one used http://store.summitracing.com/partd...MOR%2D23900&N=700+400105+115&autoview=sku and http://store.summitracing.com/partd...&part=MOR-23905&N=700+400105+115&autoview=sku

i am only after per oiler really had any one had any griff with Moroso befor

 

[Doward]

I'm running .0020" clearances, aiming for 700rwhp sustained, running 5w30. (will adjust oil viscosity to get the desired oil pressures)

 

[90T04]

What is the reasoning behind running your clearances a little loose, if you dont mind my asking Doward? The factory standard is 0.0008 to 0.0021 on the rods and 0.0012 to 0.0019 on the mains, and I have heard people suggest building to the tighter end of the toyota specs.

 

[arz]

I'm running .0020" clearances, aiming for 700rwhp sustained, running 5w30. (will adjust oil viscosity to get the desired oil pressures)

Hey is your motor running already? I went with .0018 in this motor or as close to it as I could get, two are a hair over like .00185 (close as I could tell they didnt seem to be a full solid .0019) and one at the middle with the shortest run from the filter is a hair tight. I didn't plan it that way it just worked out that way, I am happy so far, I will let you know what it looks like next time its apart. :icon_bigg

If its any consolation, all I do is road trips and beat the piss out of it. Oil pump is shimmed 9mm IIRC and the cooler bypass goes straight back to the pan without a cooler (this is in the Z) haven't made time to install a cooler yet.

I would say you might want to tune the pressures with the oil cooler bypass if you decide to keep it. Or just make sure to let it warm up.

 

[jt2ma71]

650 sustained for now bouch of rev limt wheil side ways or heavy loads

plus hard hitting nos

If i were to run my motor this way, I'd set my bearing clearances loose but still within specs and use 15/50 oil and maybe even 20 50. Synthetic of course. Also, too much hot oil pressure can cause pitting on the bearings, so I will make sure i have an adequate oil cooling system and limit my maximum oil pressure to ~70-75 psi

 

[NashMan]

i gonna be runing a rx7 base oil cooler so the cooling part is good to go

going to be runing bigger line's -10
ditch stock filter monte and plug stock hole
drill block -10
oil line -10
as for shimming not sure yet ?????
oil to try to run whould be 50 weight of some sort (hot)
most likly a oil prime setup since the cold weight will be to heavy for my likeing
and relocated filter cause the stock one will no longer be used

i have bena on some rx7 forums and they say the oil t state is 180 or 190 or some thign noter sure get mixed up answer's kinda wana know for sure


or shoudl i just drop this idea

 

[jdub]

Nash - the motor I'm working on will have the bearing clearances at mid-spec and I'm going to run a 0W-30 syn oil. One thing to keep in mind about oil is the 1st number is not accurate concerning viscosity cold...it is relative when comparing viscosities between oils. Cold viscosity on the 0W-30 (German Castrol) I'm using is around 70 cst at 40 deg C (if you want to call that cold)...that is nearly 6 times thicker than the same oil is when at ops temp. Motor oil ALWAYS drops in viscosity (thins) then it gets hot. Eneos 0W-50 has a cold viscosity of 104 cst...1.5 times that of the above 0W-30. Thick oil does not flow well cold and flow is what keeps your bearings from touching.

Before you decide to use the heavier weight oils, read this and make your own decision:
http://www.supramania.com/forums/showthread.php?t=41775

(Also read the oil link in my sig)

And this thread compares Eneos to other syn oils available:
http://www.supramania.com/forums/showthread.php?t=54294

If you want to run a thick oil, you'll need to run your clearances on the loose side of spec to get the flow you need...especially cold.

Adjuster has an RX7 cooler...shoot him a PM on the thermo opening temps.

 

[Doward]

Andy, not yet School + Work = no time to get things together. Hey, I haven't even had a chance to order my oil pump supply kit from you, so you KNOW it's not done yet!

I went loose on the TSRM specs, because I plan to run more oil than stock through the system. Also, tight clearances to not lend themselves toward running very high hp (think about how much force you need on a piston, to make a 3.0L motor make 600+rwhp) especially with a thick oil.

I'm going to breakin on 30 wt and go from there. With .0020" mains/rods, depending on how the new oiling system goes, I may find myself on a 40 weight oil

 

[jdub]

I'd be more inclined to run a 40W on a high HP motor built with the clearances a bit more loose. There's a couple out there that would be a good compromise on the cold flow side. Actually, the German Castrol is a heavy 30W...getting close to a 40W at ops temp.

I'm not shooting for HP numbers that high or RPM over stock.

Also, too much hot oil pressure can cause pitting on the bearings, so I will make sure i have an adequate oil cooling system and limit my maximum oil pressure to ~70-75 psi

Debris in the bearings...yes. From 210 deg F oil at the pressures the 7M pump is capable of...no.

 

[Doward]

Jdub, would you mind looking up the cst values of Redline 10w40 and 5w30? (I'm in ChemII right now, lol)

 

[GrimJack]

I'm running clearances right in the middle of stock and german castrol as well. Seems to be working, but of course I won't really know for sure until I pull the engine again.

 

[jdub]

Jdub, would you mind looking up the cst values of Redline 10w40 and 5w30? (I'm in ChemII right now, lol)

Red Line 5W-30 62 cst @ 40 deg C...10.6 cst @ 100 deg C

Red Line 10W-40 93 cst @ 40 deg C...14.6 cst @ 100 deg C

 

[jt2ma71]

I am also running tight clearances on my 2j, within spec. I have been running it with castrol 5w30 and will switch to amsoil 5w30 after ~500miles. All oil lines are -12, with mocal 180 thermostat and 25 row cooler. I don't plan on running it the way Nash will run his. If I did, I would have set my clearances on the loose side and use thicker oil. With the 5 stage dry sump system, oil pressure is almost instantly up as soon as motor is cranked over. Ron

 

[Doward]

Awesome, thanks jdub - I'm planning on this:

1) Initial fire up on straight 30wt
2) First 500 on dino 10w30 (probably Mobil's stuff)
3) If my oil pressure is looking good on the 10w30, I'll switch over to 5w30 Redline.
OR
3) If my oil pressure seems a little low, I'll switch over to 10w40 Redline