CB 750 F2 Old Skool Turbo

[Piute]

  hello Piute here,
Very interesting build you have going , not that I wont a turbo enjoy learning how it is done ,thanks keep us informed
  Piute N Judose

[samir_nayanajaad]

Thermostat on the oil cooler, cool. Be sure to get some pics of where you are going to mount it, I thought about one also but wasn't sure where the best place would be to put it in to get the right oil temp.

[sgtslag]

  What do you mean, "the right oil temp"?  What type of oil cooling system were you thinking of installing?

OK, it took me a while to understand your question on mounting the cooling system...  Couldn't see the forest for the trees.

I mounted my radiator in front of the cylinder heads, attaching it to the frame down tubes.  Even with the radiator's heat being blown across the heads, the sump's oil temperature averages 210 F, before it goes to the radiator.  It was 250 F, before the cooling system was installed.

My bike is plain, no turbo.  No idea how much additional heat the turbo will add to the engine oil.  I am curious, as well, if the radiator needs to be mounted away from the heads, due to higher temps.

[voxonda]

This was the cooler setup of my former Turbo, no thermostate.

Cooler from a CB900 DOHC and a twist-on filter. Make/sell these overhere alot. Makes oil/filter changes a lot easier.
On my new build, will most probably use a quarter fairing from one of my racebikes in which the oilcooler will be mounted. So away from the head. The thermostate will be mounted on the downtubes above the primaries.

#157 is my bike. Rider is one of my all time heroes from the Netherlands, far in his sixties but still fast and stylish.

[Piute]

  great thanks SEE NOW <

[samir_nayanajaad]

Sorry for the confusing question, what I was wanting to get at is where the thermostat is will greatly affect the temp of the oil that hits it.   So more or less whats the best spot to place the thermostat so that your oil will heat up to proper temp but also open if it gets too hot?  There has to be a sweet spot that gets the thermostat to open and close to keep your average oil temp in the right range.  I would think just an open system would have issues warming up on a chilly day and seeing how these bikes are cold blooded it would lead to a long warm up time.

As for the rad it self I don't think there would be a problem mounting it in the same spot as you mounted yours.  Maybe if it were a race bike that was at high rpm a lot it could be an issue but in a street application I don't think it would be a problem.

[voxonda]

Not totally agree about these bikes being 'cold blooded'. Even when not racing, riding in traffic can rise the oiltemp right up. I have always mounted oilcoolers on my 750's, street or track, and never experienced problems with them. You are right in warming up time, one has to take that into consideration.
If there are prob's with radiators, it is often that it is placed so that it has no good flow thru it. People often placed them on the downtubes in front of the cross framebar, and so interupting air flow. Or mounting them in a fairing with very limited airflow.

[sgtslag]

I have a write-up on how I put together my oil cooling system (radiator from a CB900), which is similar to Voxonda's (I would highly recommend his adapter -- mine is very similar, but the maker is out of business; spin-on filters are wonderful).  I have a thermostat installed.  The write-up has photo's, and measurements in it.  If you would like, I can e-mail you the PDF file (<1 MB).  It should answer most of your questions, and that way I won't be hogging a lot of bandwidth re-posting it.  Let me know your e-mail through the private message system, here, if you are interested.  Cheers

[Piute]

AZ said will not be using Turbo,
but will most defiantly need A cooler
 going to pull up that info Sgt.remember reading
  ? On the right side of bike theres a big flat bolt /nut that I've noticed other either putting a temp gauge or pressure,can you elaborate on that please, Tanks
            Piute N Judose

[voxonda]

That is a plug from the main oilpressure gallery. Good point to install pressure gauge. In same gallery is the switch from your (red) oillight. Beneath your carb's.

[Piute]

TANKS

[voxonda]

The build up of the definite engine, deep sump and screw-on filter. HD studs, nuts and bolts for the crank.

[samir_nayanajaad]

Thanks sgtslag, that pdf would be great.

Voxonda don't mean to thread jack but Id like to run an idea by you and anyone else who would have input to this.  My sketch of a plan is to mount a turbo and intercooler on the downtubes. I dont know if there is enough room to fit an oil cooler as well. Maybe down low but I would be worried about a stone flying off the front tier and puncturing the cooler.  

What I was thinking is to mount a much larger cooler under the bike. It would be almost horizontal but with a slight angle and a scoop so at highway speeds it gets a bit of a forced air effect to help it out. Also to have a larger oil tank to increase capacity.

I may scrap having an intercooler to have the space for an oil cooler but Im interested if this seems like it would be a workable solution for the added heat the turbo creates both in the oil as well as blocking air flow up front.

[voxonda]

It is 'workable' but you wont have the airflow your looking for due to mainly your frontwheel. Why not put the cooler beneath the headlight, like the old Superbikes used to run?


Trail fitted the Turbo on my racebike.

[samir_nayanajaad]

Didn't think of that. That sounds way simpler than what I was thinking.

[sgtslag]

Be careful of mounting your oil radiator on the forks, or anything else that moves relative to the frame, as you want to avoid having the oil lines flex and move, as the forks compress, or the front wheel turns.  This will put flex stress on the oil lines, their connectors, and the radiator's connectors.  Flex-stress on any of the oil system's components is not a good idea...


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The best location to mount the radiator, is on, or to, the frame:  nothing moves, no matter how bumpy the road gets.  Everything can be secured in place, without flexure, so no stress is put on any of the components, other than the pressure within, from the oil pump.


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On this type of oil cooling system, 100% of the engine's oil is flowing through the cooling system.  Any failure (leak, blockage), affects the entire oil system, and the entire engine, so it needs to be secure, and without failure.  Cheers!

[voxonda]

Good point, but I forgot to say: not to mount to the forks but with a bracket to the frame.

[samir_nayanajaad]

Think im going to have to wait until I get closer to this bridge before deciding how to cross it. Too many unknowns in my case to get a solid plan.

[TOOLS1]

I want to know more about that deep sump oil pan. It's funny how things happen, but I saw one, for the first time today at Cycle one, and now there is one posted here.
TOOLS

[voxonda]

Hey TOOLS:

These pans were used in the old dragracers, to make sure the pump could pickup oil under heavy acceleration. Cannot be used with oem or 4 into1 systems due to fitting depth. Use it for the Turbo due to the effect on oiltemp by the turbo. More oil, oilcooler with thermostate should allow for better thermo control.

Rob.