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OK - The fans do cool the motor - I have been thinking of Wards fans for my ride. - Fans correct the symptom not the actual problem.
You need to look at what causes the heat. When I was coming up, every thing was 74 cu in,50 hp motors, maybe a couple 80 - 84 cu in strokers here & there - Today 103 - 110 + cu in 100+ hp is common = more heat.
It's an air cooled motor - no radiator like your car
The EPA regs - The factory motors are set at about 14.7 AFR - that is considered complete combustion- all the O2 & all the hydro carbons have been used = no emissions - The timing is also advanced, the compression is low and the cams are ground accordingly. This all makes for heat & the pinging/ detonation the you hear. If the AFR gets any leaner - 14.8 + the extra O2 will look for something else to burn - like valves or pistons. If you add pipes, air cleaner, cam or compression the magnifies the problem.
If you have ever looked at a Twin Cam piston you will see a short skirt more like a racing piston. This is necessary for the increased bore, it is also poor is conducting heat to the cylinder for cooling. That is why the MOCO put in piston oilers & S&S sells better ones.
You need to add fuel & probably take out some timing - buy a good tuner & have your bike tuned by some one who knows what they are doing - not the dealer - you will still get an EPA approved fuel map.
I put an Andrews 26 cam in a mild 9.0 - 1 cr 95 in motor and had to retard the timing to remove the pinging
If you get an auto tuner module get one that uses wide band 18mm O2 sensors. Thundermax - or Daytona Twin Tech. I use the DTT - You will get your best power around 13 -13.5 AFR - that will vary, could be 12.5.- run the idle , low speed & WOT a little fat - highway cruising speeds a little lean 14 - 14.2. - 14.4. Back off the timing when you open the throttle at lower speeds. & run more advance it at cruising speeds for gas mileage.
Also run a good synthetic oil - I run Amsoil 60 wt in the summer & Amsoil 20-50 in the winter, less friction = less heat.
I run a 95" 10.5 cr ,short duration - high lift torque cam - Woods TW - 5 it has high cranking pressure, and rarely see temps above 240 - that is in 95 degree Fla heat, around town, in traffic or highway @85 -90mph. I have a H-d oil cooler but it is mounted vertically on the down tube no fan. I am also running fairing lowers.
I hope this helps -Eastcoast Jim
Last edited by Eastcoast Jim; Jul 6, 2016 at 09:30 AM.
Reason: clarity
That the same scott who raves about his suspension??? Way to much yammering in his posts to even read them. I must have A.D.D. when it comes to reading that much.
Batman
Not the same Scott. This is oil Scott. Suspension Scott has not been around as of late and I don't miss his posts.
Now thats summer is in full swing across the US this (Excessive heat) is something we are going to see posted here time after time with guys posting all sorts of heat related issues form degraded engine perf to heat related rider discomfort issues that can be significantly improved for those that have an open mind that will allow them to do so which isnt always the case.
It was hot before I installed the cams. Not complaining about the heat as I realize its a air cooled engine, just a simple question on whether or not the engine is suppose to run hotter with a cam swap. This is my first cam swap and didn't know.
Some asked about my exhaust. I have Dresser Duals, 4in. Rineharts, Fuel Moto air filter, PCV/Autotune. Most of my trim table runs around 13.8 except for cruise range I have set at 14.0. Higher throttle % at higher RPM runs 13.2. Most have said it's normal for it to run a little warmer as this is my first cam swap, I wanted to get some opinions on this. Thanks to all.
That the same scott who raves about his suspension??? Way to much yammering in his posts to even read them. I must have A.D.D. when it comes to reading that much.
Batman
No, that's a different Scott.
This one likes to rant and rave about oil temps and battery voltage. May or may not be getting a kickback on fan sales but either way, painful to read.
edit. I see a previous poster cleared up the confusion. Lame must go with the name!
It was hot before I installed the cams. Not complaining about the heat as I realize its a air cooled engine, just a simple question on whether or not the engine is suppose to run hotter with a cam swap. This is my first cam swap and didn't know.
Without evidence to support your claim, it's kinda a crap shoot. Call Fuel Moto, they will get you straighten out. Super guys to deal with. Let them know that you feel the bike is running hotter than b4. They will have this addressed by the weekend.
Type of oil has NO bearing on operating temp so just get that out of your mind.Synthetic oil may handle higher temps as to not break down as fast as conventional oil......maybe. They don't lower the operating temp, yeah i've tested it on my bike. Fans do NOT have a effect on the temp that the engine runs at. Fans may have an effect on cooling off an engine at very slow speeds or when stopped. Getting the engine's ecm mapped by a good tuner on a dyno will have the greatest effect on the running temp of the engine along with NOT lugging the engine down or overloading the machine. These afr's numbers being thrown around are misleading as pure gas is 14.7 ish but e-10 is 14.1 so those numbers based off 14.7 are only applicable if you are running pure gas all the time.
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