EGT jetting

[bugnut]

I would like to know who here jets by there egt temp. I know it is alot with the snowmobile racers but I haven't seen it too much on the banshee's. Been thinking about getting a digatron, wondering if it would be a waste of money or not.

[VWMIKE]

I used to use one on my Honda Pilot I had, but found it annoying to watch the gauge all the time, as well I found it kind of took some of the fun away cause I was always paranoid about temp. I just got my banshee and will def not be getting a digitron! There's no magic temperature since it's solely Dependant on probe placement. They are good products but once you get comfortable with plug chops, set it up a tad rich and just ride the bitch!

Mike

[moneybags]

I would deffently have one on my bike if I had the money. I would consider it cheep insurance. plus if you have power jets on your carbs you could ajust on the fly to all air changes and elevation. Have the bike dynoed with the EGT on and see where the bike makes it's best power. Then you can keep you bike diled in from their.... Not like you have to look at it every second your are riding.

JMO Thow

[Snopczynski]

I have had them on bikes, and just took them off after we got it running right. If we go somewhere else thats a different elevation, or change something on the bike, then we just put it back on. The bikes I ran them on had fittings welded into the pipes, then when I took it out, I just put a threaded plug in the fitting. The probe placement is crucial, but if you get it 6" from the piston, or at least as close to 6" as you can, then it should work ok.

[bugnut]

I always have them on my diesel trucks and figured I should put them on the banshee. It is always nice to know what is going on in the engine. Now I just need to get the digatron

[Snopczynski]

I always have them on my diesel trucks and figured I should put them on the banshee. It is always nice to know what is going on in the engine. Now I just need to get the digatron

 

I never had good luck with the digital setups, let alone wanted to spend the money when I could roll the bike and wipe out the gauge. I run an isspro mechanical gauge, they arent too spendy.

[pittss1c]

An EGT on a 4 stroke is a pretty easy thing, but I am not sure that it is obvious of where to place an EGT probe on a 2 stroke, or what the gauge really tells you.

Just because, it seems that, for every heat pulse you get from exhaust, you will also get a cold pulse from fuel/air.

Also a general rule of thumb I thought with EGT was that the absolute value doesn't matter too much. it is mostly good for variable mixture engines and setting a mixture relative to the peak at the current conditions.

I use an EGT in an aircraft, and can tell you that the absolute value of the gauge depends a lot on temperature and humidity. Many gauges don't even have temperature markings.

Although I have heard of race car drivers that say, after the needle goes past a known point on the gauge, they always melt pistons. (for a given installation)

 

I am also quite confused how one would use an air/fuel probe accurately on an effectively ported and piped 2 stroke as well.

[Snopczynski]

An EGT on a 4 stroke is a pretty easy thing, but I am not sure that it is obvious of where to place an EGT probe on a 2 stroke, or what the gauge really tells you.

Just because, it seems that, for every heat pulse you get from exhaust, you will also get a cold pulse from fuel/air.

Also a general rule of thumb I thought with EGT was that the absolute value doesn't matter too much. it is mostly good for variable mixture engines and setting a mixture relative to the peak at the current conditions.

I use an EGT in an aircraft, and can tell you that the absolute value of the gauge depends a lot on temperature and humidity. Many gauges don't even have temperature markings.

Although I have heard of race car drivers that say, after the needle goes past a known point on the gauge, they always melt pistons. (for a given installation)

 

I am also quite confused how one would use an air/fuel probe accurately on an effectively ported and piped 2 stroke as well.

 

Its pretty simple to install one. You just weld a bung or drill a hole in the header tube 6" from the piston. You jet the bike to keep the temp of the exhaust under 1250 degrees and it runs good for a long time. I have ran them on a few different bikes, and it all pretty much just works as simple as, dont go over 1250 degrees, then dont melt pistons.

[Fireroad Express]

i used them alot on my sleds but haven't put them on a banshee until now. i need some C-12 or i would have tried them out today. this is a digitron DT-32 on the bike. i used avenger 3's on the race sled. it had a neat record feature that would tell you how hot your pistons got before they melted!!! (hard to look at the display while you're trying to watch the track!)

Edited January 30, 2009 by the grinch

[530grafix]

Ive ran a digitron for the past year. All i can say is I love it. it has saved my topend more than once. I ride alot of different elevations. digitron says to contact the pipe manufacturer for proper distance from the pistion face. on my shearers i ran it at 3.5 inches from the piston face. basically right up against the flange. did lots of plug shecks to get it dialed in right. then i just recorrded the temp and was on my way. from then on i would just jet to the temp. i ran my 4 mil cub at 1125 degree, but they are all different. also another good investment if your gonna run a digitron, is to install boost jets. makes adjustments alot faster and they can be done on the fly...