Topic: Oil Cooler Thread

[goon 1492]

Your not alone

She's fast!!! I call her Katrina!!!

I use the Duratrax temp gauge for $32. Goes as high as 412F

Cheers

Soooo what brand is it, the top one in my pics is the new version of the traxxas jato with the 3.3 motor. I broke the 2 stage chassie on it going into a curb at about 25mph, so I re-engineered it with a single stage chassie with .188" thick chassie plate that started out as .25" 6061 aluminum milled down too .188 with .25" rails incroperated as a frame, and had to make custom mounts for all the servo's, battery box and reciever box. That little devil will do 0-65mph in 4.3 seconds.
Also eldar the motor I run actually is designed for 33%nitro, I haven't run it yet on that I have to use up the rest of the 20% gal that I got. At 27 bucks a gallon its still crazy fun.

I can't wait until I can get a carbon fiber chassie for my revo and update the motor in it to the 3.3.....
wheelie power!!!!

[eldar]

Been away from the scene for a while. Last r/c I got was the nitro 4tec. It was crazy fast at the time with being able to hit 50 out of the box. Radio was not up to par on performance. I still have it but enough other stuff has come up that I have not run it in almost 7 years. It would spin all 4 tires no problem when gassing it.

[Gamma]

Where's this thread going?
Up until 3 years ago I was competing around the UK at F3A Aerobatics, (that's R/C model aircraft). Methanol with 10% nitro, synthetic oil, with a splash of castor.
SuperTigre 90 with Hanno Prettner Pump. Self designed and built. 2 meter model.
Air-cooled finned motor.

[eldar]

Last I knew, most of the motors except the marine models were air cooled. But then 20-25% nitro used to be the max. I would like to get into airplanes too but I think when I do that, I will get a cheap plane for like $70 with everything(like I said cheap) mod it for better performance. that way when I destroy it with a full speed rin into the ground, I am not out that much!

[SteveD CB500F]

Hey guys, this thread was supposed to be about Oil Coolers.

I know that all threads get sidetracked every now and then, but if you want to discuss RC Cars, start a new thread in the Open Section.

If the content veers over 50%, I might have to move it as being "no longer substantially to do with SOHC4s..."

[Deltarider]

+1
Thanks Steve.

[mick750F]

   Yeah...you guys take your toys and get outta our yard before we call the cops! Oh, never mind...Steve is the cops. 

Mike

[eldar]

Well I guess until some new info comes up on the oil cooler, the subject is kinda dead. Terry was going to do the test and until that is done, we are in limbo.

[Deltarider]

the subject is kinda dead

Not really, but first things first. Every engineer knows we have to agree on how we measure first. Oil temp can't be checked with an infrared gun from the outside. Cilinder head temp can, but it's difficult doing it riding.
Check this thread for serious stuff and less frivolity.
http://forums.sohc4.net/index.php?topic=44306.0

So far, little reaction from our engineers though.

[Deltarider]

Anybody know the volume of oil an SOHC4 normally pumps?

For a CB 650 it's 21,3-26,3 liter/minute @ 3000 rpm (source: Haynes) That's about a gallon (US) every 10 seconds.

[Terry in Australia]

Once again, if you read back a few dozen posts, you'll see that I didn't measure the oil temp with an infrared gun, I measured it with an after-market motorcycle oil temp thermometer. I used the infrared thermometer to measure the cylinder head temp.

The new heat temp gun hasn't arrived yet, but as soon as it does, I'll go do all the original tests again, plus a couple Mark Linder suggested, plus relative oil pressures. Cheers, Terry.

[TwoTired]

Anybody know the volume of oil an SOHC4 normally pumps?

For a CB 650 it's 21,3-26,3 liter/minute @ 3000 rpm (source: Haynes) That's about a gallon (US) every 10 seconds.

That seems a high value, doesn't it?  Is that a free flow spec or one with an input to output pressure differential?

A pump that has no resistance to flow will allow more volume to pass than one that does.  Obvious extremes are an open outlet and a blocked one.  With variations in between.
Another variable would be the viscosity of the fluid traversed through the pump or the circulation path.

Anyway, what I am trying to get a feel for, is the volume of oil that is pumped through an SOHC4 engine, which is not the same as the volume of oil the pump is capable of producing, (when outside of the system it is intended to operate within).

If we know the volume and the heat transfer resistance, can't calculate the heat removal characteristics?  I don't have the formula in hand yet.

Cheers,

[crazypj]

SACS Suzuki's (oil boilers  ) pump about 22litres per min @~4psi. for engine cooling
The limit is around 150bhp because oil cooling is less efficient than water cooling.
Honda doesn't have oil jets to cool underside of pistons on old bikes so there is going to be a limit on what you can expect. the cylinder head temp is less critical than the underside of piston
PJ

[Deltarider]

Is that a free flow spec or one with an input to output pressure differential?

I suppose it's a free flow spec, as viscosity will make a difference ofcourse. But - no mistake - near redline total oilvolume will be sloshed around every 3-5 seconds.

[TwoTired]

Is that a free flow spec or one with an input to output pressure differential?

I suppose it's a free flow spec, as viscosity will make a difference ofcourse. But - no mistake - near redline total oilvolume will be sloshed around every 3-5 seconds.

Maybe so.  But, whenever the oil pressure exceeds 57 Lbs, the pressure relief valve (on the 750) dumps excess oil volume into the sump, in addition to pushing some through the engine internals. So, it appears I need the oil volume actually going through the filter rather than the oil pump delivery rate.

I also note that bypassed oil from the pump would cool the heated oil in the sump or the returning oil to the tank.  So, reading the tank oil temp should be less than the return oil going to the sump (from heated internal surfaces) or even the temp of the oil in the sump, as it is diluted (temp-wise) by the oil from the oil tank.  Certainly there is some cooling from the oil pan itself, too.

Cheers,

[Deltarider]

Some have their sensor fitted where that 'oil path cap' is, under the ignition on the right hand side of the block. 

 

[pddpimp]

I have searched high and low for the answer, but no luck.

I need to know what size lines are best for an oil cooler on a CB750, -6, -8, or -10an?

Thanks.

[MRieck]

 I use -6

[Steve F]

I use -6

What size hose does that use?

[kmoll70]

Here is how I remember it:

1 AN unit = 1/16 of an inch

so 3 AN = 3/16

and 6 AN = 3/8

[Steve F]

Here is how I remember it:

1 AN unit = 1/16 of an inch

so 3 AN = 3/16

and 6 AN = 3/8

That's good to know, Thanks!

[sparty]

I use -6

same here... I used Earl's -6 on mine.

[pddpimp]

Schweeet. Thanks!

[Steve F]

Question about using AN fittings:  The threaded (NPT) that go into the adapter aren't a problem, but if your oil cooler just has straight, non-threaded hose attachment, what typt of fitting is used there if you want to go with s.s. braided lines?  I don't like the "A-N simulated" fittings that just hide a hose clamp, but was wondering if they offer a type of fitting that can close-down on the hose, like a collet or something, and squeezes the hose enough to grip the straight radiator fittings. 

[pddpimp]

Nothing that I know of. You could get them crimped on like A/C hoses, but then you couldn't ever take them off.