Exhaust Header Temp.

[rocketjohn]

just a personal opinion that i might change after i see others opinion.
if u put more gas in the system to eliminate the decel popping then that might make for a hotter pipe?
maybe i should change to question instead of opinion

If you enrich the mixture you cool the exhaust...lean mixtures burn extremely hot....have you seen how something burns when you give it pure oxygen....that's as lean as it gets. When you put on a fancy new free breathing exhaust you must also retune to get more gas into that pipe. You are getting more air moving, so you must have more gas too!

 

[Super D.]

Come on @Super D. lets see some pictures

I am going to wrap it , and try to fabricate some heat shields. I am calling BS on people getting used to the heat. That is just ridiculous. I will post some pics after it is complete.

 

[warp9.9]

I am going to wrap it , and try to fabricate some heat shields. I am calling BS on people getting used to the heat. That is just ridiculous. I will post some pics after it is complete.

Yep had some made for mine also. No wrap tho.

 

[Paul Bryant]

D, as I have said to you, this amount of heat is not normal.
As others have said here you have a lean condition going on, this is what is causing the heat, that or there is something else wrong somewhere.
Also you mentioned to me that you had done the 12 minute tune then taken the heat readings, I would expect the header pipe to be real hot sitting still for 12 minutes.
What is like when riding down the road ?

 

[barbagris]

Excess engine heat is not injurious to PIPES - The issue is legs being close and/or insufficiently protected. Stainless pipes get especially bad as they are poor heat conductors. So the develop hot spots rather than sink the heat over the whole system. Want to keep the pipes cool and gas hot? Ceramic coat inside and out. ime wrapping thin stainless often creates crystalline micro fractures in the steel.

Running an engine too rich reduces its efficiency, running it too lean is as bad (or worse) but higher efficiency modern engines are designed to run leaner and hotter. Exhaust valves and seats take the worst of it - but hardened seats and neominic valves are made to take this.

Adding fuel simply solves a symptom - make the blighter run to optimum and add insulation to the inside leg of your riding trousers.

 

[Super D.]

D, as I have said to you, this amount of heat is not normal.
As others have said here you have a lean condition going on, this is what is causing the heat, that or there is something else wrong somewhere.
Also you mentioned to me that you had done the 12 minute tune then taken the heat readings, I would expect the header pipe to be real hot sitting still for 12 minutes.
What is like when riding down the road ?

I also took the temp after it had cooled down, and after a couple of minutes the heat was right back up there. Attached is a pic of the tune that is on there right now. Hanso was kind enough to send it to me.
Riding down the road, it is cooler.... But still ridiculously hot.

 

[Super D.]

I also took the temp after it had cooled down, and after a couple of minutes the heat was right back up there. Attached is a pic of the tune that is on there right now. Hanso was kind enough to send it to me.
Riding down the road, it is cooler.... But still ridiculously hot.

So seeing the map, and knowing the tune "20228goodbase free flow ex Cat delete Ramair anti decel pop plus.hex".", does anyone have any suggestions? I'm up against it here...

 

[barbagris]

Simple fact is - You need to know what the AFR is. If you don't have the tools - Go to a good Dyno centre.

If the AFR is not lean and the pipes feel hot to you then you just need a shield or similar.
If the AFR is too lean - then you're potentially damaging the engine.

I monitor (and now regularly log) AFR - heat was melting Cordura pants when they touched the pipes - so made a shield.

And it would help immensely to know WHICH headers and pipes. Lambda in? - if not - is O2 disabled in TuneECU. HansO's maps are a good start point - but from experience nothing beats bespoke.

 

[HansO]

I have sent him a 5% richer tune to help cool things down not that the other was lean, far from it. I'm thinking he will need heat shielding also wonder whether he is running Ethanol mix fuel/Gas as that runs hotter, the Rocket should be run on low Octane Fuels as it is low compression motor

 

[Super D.]

I have sent him a 5% richer tune to help cool things down not that the other was lean, far from it. I'm thinking he will need heat shielding also wonder whether he is running Ethanol mix fuel/Gas as that runs hotter, the Rocket should be run on low Octane Fuels as it is low compression motor

I do run a ethanol mix (California), and I have been running 91 octane, should I try the regular 87?