UBETRUN, how long have you been running your 12.1 686 ??? I'am not sure I want the 12.1 anymore????

 

XtremeRaptor, O.K. there goes that idea of doing it myself.

 

Did most of the 360s that developed rod knocks from the lean burn have broken rings?

 

Yes, I saw 2 dodge engines apart for rod knock and both had cracked rings in cylinders that were noisy. I'm sure one was a 360 but the other may have been 318, it was 20 years ago. Those engines were a mess, they ran hot and couldn't be timed properly without standing on one leg and holding your tongue to the left. After the 2nd one came into the little garage/body shop where I worked, we called the dodge dealership and their mechanic explained the lean burn engine and some of the trouble they were having.

Hiram - I've had mine a week:-)

 

idiotraptor- Chill out no one is accusing anyone. You are a a$$ saying i told you so. You make the forums enteraining. You can not break a rod as slow as your raptor is.

 

I have an idea if bubba wants to do this. I have a couple of sorces for having the parts examined. One is a guy who does investigations for the NTSB for the cause of engine failures resulting in plane crashes. The other is someone the works in a lab doing nondestructive testing but they may also do distructive testing and analyses. What do you all think?

 

Bigbubba I feel if you were running 160/165 mains and DJ needles that is to lean. I was running 170/175 mains with DJ needles with a 11:1 660 Raptor, and running very lean. I started off with 180/185 mains and it ran good in cold weather, but once it warmed up it was to rich.
With my new 686 12:1 engine I am going to start off with 177.5/172.5 mains with CT Racing TI needles and see how that works.
The next time you get yours together do with at least 170/175 mains with DJ needles and work your way up from there. I am at sea level here in Houston Texas.

 

Im still confused about this compression issue, does the 12.1 put more stress on the crank than a 11.1 piston with the stage2 ? I dont race ....(unless challenged or asked ) my need for speed is for pure therapy, I love my Raptor and feel BigBubba's pain and the other's that have experienced the rod failure, I have called JE and asked about this issue and said the rod should be fine if running 12.1 use 110 octane and for 11.1 use at least 95 octane in warm climates, Bubba what fuel were you using? Should I scale back and just go 11.1 ?????????????

 

I'm running the 12.1 thus far no problems I just think it adds heat but with the right gas the temps should be under control.

 

How many times do I have to tell you guys that it didn't overheat so in other words it wasn't cause of lean jetting. airraptor it didn't overheat so your still an A$$! Get used to it, everyone agrees! It's your rep. now! I got almost 4 good hard rides out of it after DTR jetted it.

Patsraptor: We also live in completly different altitudes with completly different weather and Raptors. I jetted mine before the dynos exatcally how Mark jetted his where he lives on the dyno and I was wayyy off from being close so that prooves that every bike will run different and it's pointless to argue with how your bike was jetted.