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[ltank]

What can be done to make 95 or 103 carburetor TC run oil temp
below 200 degrees? Is the main culprit the smaller exhaust valves and ports? Carbs can be run richer to run cooler. I thought the larger fins on heads and cylinders compared to EVO. My questions are concerns with the Fatso 100" I am building for my son. But the EVO bottom end uses  S&S HP Oil Pump.

[Ed Ramberger - One_Screamin_Eagle]

What can be done to make 95 or 103 carburetor TC run oil temp
below 200 degrees? Is the main culprit the smaller exhaust valves and ports? Carbs can be run richer to run cooler. I thought the larger fins on heads and cylinders compared to EVO. My questions are concerns with the Fatso 100" I am building for my son. But the EVO bottom end uses  S&S HP Oil Pump.

I would be surprised to see oil temps under 200.  Out of curiosity, how did you determine 200 is the temp you are trying to get below. 

If you over jet something in an attempt to run it cooler, you'll simply have a host of other problems related to running too rich. 

I'm trying to understand where you're trying to go. Thanks.

[ltank]

I have S&S V 111 and running all day 95 degrees the oil temp never runs over 180 degrees. I thought a 100" Fatso EVO bottom end. With a carb it should run cooler than the Fuel Injection that run lean making them run hot. The bigger cooling fins should run cooler than a week 96" EVO about 180 to 190 degrees.

[grc]

The Twin Cam engine was designed to run oil temps in the 230°F range with standard ambient air temps.  Look it up in the manuals if you doubt my word.  So I also wonder why you think it's necessary or even desirable to run oil temps below 200°F.

Running the bike too rich to reduce peak combustion temps and therefore peak engine temps is the old school way I suppose, but I'd like to think we have learned something over the past thirty years.  Don't screw up the tune, wash down the cylinder walls, and carbon up the engine and exhaust with excess fuel.  If you want to control engine and oil temperatures, utilize fans and oil coolers.  You can't directly compare a Twin Cam to other air cooled engine designs btw.  There are many things that affect oil temp that are part of the basic design.  A TC was never intended to run as cool as an EVO.

Jerry

[Ed Ramberger - One_Screamin_Eagle]

I didn't get into the fins but I see it's going to come up.  Trying to compare fins from EVO to TC and their effect on oil temps is like comparing apples and oranges. 
Also there are numerous reasons the tank temps will be different.  If you saw 220ish +/- a little you'd be just fine. 

[INDEPENDENT_1]

You need your oil to get warm enough to burn the water that condenses inside it off. Does that mean 212F on your gauge? Not necessarily. Water will dissipate before it boils if the temp at which it dissipates is sustained for a long enough period to dissipate the whatever volume of water has condensed so it becomes a fine line if you start running temps below a certain temperature. That being said, cylinder pressure has a lot to do with heat as well. I have a low cylinder pressure T124 with an extra capacity oil pan and the stock HD oil cooler on my 2012 RGC and Monday the ambient temps were around 75 degrees Fahrenheit. I rode from Vicksburg MS to Fort Gibson, OK (about 575 miles) running 75-80 MPH and my oil temp gauge never got over about 195F. Extra capacity, complete circulation (oil not being picked right back up after being dumped into the pan) and a good oil cooler and perhaps the larger S&S fins on the heads and cylinders and an open loop (richer than stoich) tune all probably contribute to this.

[HILLSIDECYCLE.COM]

The Twin Cam engine was designed to run oil temps in the 230°F range with standard ambient air temps.  Look it up in the manuals if you doubt my word.  So I also wonder why you think it's necessary or even desirable to run oil temps below 200°F.

Running the bike too rich to reduce peak combustion temps and therefore peak engine temps is the old school way I suppose, but I'd like to think we have learned something over the past thirty years.  Don't screw up the tune, wash down the cylinder walls, and carbon up the engine and exhaust with excess fuel.  If you want to control engine and oil temperatures, utilize fans and oil coolers.  You can't directly compare a Twin Cam to other air cooled engine designs btw.  There are many things that affect oil temp that are part of the basic design.  A TC was never intended to run as cool as an EVO.

Jerry

Solid info here, gents.
Scott

[kiro]

I have a low cylinder pressure T124 with an extra capacity oil pan...

Do you advise using a larger oil pan as a cooling measure James? I've read mixed reviews on this...

[INDEPENDENT_1]

Do you advise using a larger oil pan as a cooling measure James? I've read mixed reviews on this...

I've read that a lot also but it's worked for me and a few customers who've opted for it. I don't think most of the country appreciates the heat we have here in Oklahoma and Texas and he Midwest. I guess I'd advise not to believe everything you read on the Internet. FWIW, Baker Drivetrain changed the design of their pan based on some things we found in our shop. After those changes were implemented, we saw a nice improvement in how effective their pans work. I wish they had a Softail pan. We have a customer that is struggling to keep his temps down.

[kiro]

Baker Drivetrain changed the design of their pan based on some things we found in our shop.

Thanks for the heads up - I'll check out the Baker pan.