Wimmer Oil Coolers. www.cycleimage.com

 

Oil Cooler now and synthetic oil after break in.

After break in it should run a little cooler. If possible try to get out in the country where there is not a lot of stop and go traffic and get some miles on.

 

Have you had it remapped yet? Can the wrong fuel/air mixture cause this?

 

Good point Troyus,

Bump up the ECU or re-map. If you have a lean fuel mixture it will cause the engine to over-heat.
Also make sure you don't have a vacume leak anywere on the throttle bodies that could be causing a lean problem.

 

that is a good point, I don't think it's even common to map idle during a dyno tune.

 

Spent 4 hours on dyno Friday night. Put in cooler plugs and tried rich map at idle but didnt help. Will look int oil cooler. Will oil cooler help when sitting in traffic?

 

****, I hope this isn't common, what compression pistons did you get? At 900 bucks for an oil cooler, this adds some twists to the big bore upgrade

 

I'm not so sure it's detonation you are feeling....detonation occurs under load not upon blipping the throttle usually..as I said in a previous post, try to replicate load on your bike by slightly "chugging it" in one gear harder than you "should" be in. If you are having detonation it shoud also be occuring in the upper rpms when you "get on it".

 

Does the engine light come on?

 

I'd bet $$ that it is the same problem described here->http://www.rswarrior.com/forums/topic.asp?TOPIC_ID=13488

 

No engine light no problem at higher rpms. Engine cools quickly when moving. Moniterd tempature with electronic hand held gizmo. Problem occurs when external tempature near spark plug reaches 250 degrees (internal tempature unknown ?) If you come off idle slowly no problem. It's a nasty clunking sound when it happens. My dyno guy has tuned lots of bikes (nitrous turbos etc) and he says it detonation not pre-iginition.

 

Say Rob. What are some of these mysterious knocks on the Road Stars. From completely stock, after warm up at idle it has a muted kind of knock that to me sounds like the cam gears backlashing or something. When I take off very relaxed throttle in first it almost sounds like light pinging but maybe lifters or valve train? I think that I figured out it wasn't pinging as fuel octane makes no difference. Load makes no difference. As I said it is very muted noise, but noticable to me. KC.

 

cbwarrior, where did you purchase the 108ci kit? What compression ratio did you order?

 

Oil Cooler helps a lot, but stock in traffic on this bike, is not a good thing....

 

I got 108 kit from OE using 10.?:1 pistons. Is there any way to get contol over timing?

 

cbwarrior,

Let me take a swing at this. Have the same phenomenon on my bike with Stage IV kit installed.
The detonation you are talking about sounds like throttle body back firing and not detonation within your cylinders.
The biggest problem is the hot air the collects under your tank, right where your air filters are and the relocated air temp sensor. The air sensor gets really hot - hotter than the air the engine sucks in - and the ecu will lean out your mixture more and more. Together with already hot intake air the fuel fumes ignite when the hit the hot intake valves.
Two potential fixes:
Relocate the air temp sensor to a place where it reads outside temp versus being heated by the engine heads. A good pace for that can be the right front of you tank where one of the pressure sensors used to be installed.
The second fix (just put mine together) is to install a fan inside of the right air-scoop (I have the original Stage IV scoop) and blow fresh air under the tank. That's also a great place to put the air temp sensor - simply drill the back of the scoop and install the sensor in there.

The problem is not so much the hot engine itself but the hot air bubble under you tank when sitting in traffic. As soon as you move you get fresh air underneath it and the temp sensor cools down fairly quick.
The oil coolers will not do anything for you in this situation. They help the engine when you race it hard at high rpms. Your problem will happen even if the oil is less than 180 degrees.

Hope this helps!

Oliver

 

Shucks, Franki' beat me to the punch an it sounds like he's got a real plausible answer, to boot.

I did write quote:"cbwarrior, I'm not nearly as knowledgeable as some others here, but I think I'd have to go with harley-jones on getting that thing out in the open and letting it break in. If my memory serves correctly (not a 100% certainty!), I think Rob of OE has stated that their stuff runs very tight tolerances. If your bike is fresh from the Recall Rebuild with the HC 108ci kit, chances are it's getting too hot from those tight tolerances (my SWAG!). [/emoticons/emotion-6.gif]

Bummer. I feel for ya. That's the same kit I've been gnawing over for the past few weeks. I'm sure it'll work out though. Whenever I make a mod, I always have something go a little awry. [/emoticons/emotion-2.gif]

 

Kc it is the ROad Star mystery knock....the cam gears for sure.

CB detonation and pre-ignition are the same as far as I know. Clunking is not detonation or preignition, that stuff sounds like a pinging or pennies in a can if you shook them.

 

Even some stock Roadies have this problem....if it's not under load it's not detonation.

 

guys, my dealer talked me out of the big bore kit with high compression pistons. He said flat out i'd have overheating and driveability problems (especially here in south texas)....i hope he's not right. I'm just going to put it back stock after all, and wait and see what happens with some of the others who are instaling hc standard bore and hc overbore pistons.

 

Your dealer simply did not want to get involved with it. The problem described in this thread has nothing todo with Big Bore overheating. The real problem is any kind of BAK setup when sitting in traffic. A stock bike with a BAK (no matter what) will have the same issues. Its the exposed air temp sensor and the intakes that suck in hotter air that are your problem and not displacement or HC.

 

Frankenstine, temperature sensor makes sense. I use OE BAK which mounts temperature sensor at front top under gas tank. Bike was on dyno for 4 hours off and on trying different things (cooler plugs, enriched map at idle, etc.) Dyno has 2 fans and both had to be turned off while bike was idleing to reporduce problem. Do you have a model number of fan you mounted in s* scoup?

 

Rob, preignition and detonation are two very different animals.

 

Did I miss it? What octane are you running?

 

Arthur I was wondering the same thing. But I think oliver has this rapped up.