450r Carb On Ethanol

[stodd347]

I AM ABOUT TO PURCHASE A 450R CARB, I AM THINKING ABOUT GETTING THE 06-08 CARB TO HAVE THE FCR. PLUS I HEAR THAT THERE ARE ALOT MORE ACCESSORIES FOR IT(ACCELERATOR PUMP, NEEDLES) LOOKING FOR SOMEONE WHO HAS TRIED THIS ON A 450R CARB, I CONVERTED MY 400 CARB RECENTLY WITH NO BIG ISSUES. I HAVE SOME POPPING ON DECEL BUT NOTHING MAJOR. AM ABOUT TO GO TO A 426 13:1 SETUP AND RUN E85 STRAIGHT. SOME PEOPLE/SHOPS SAID I WILL HAVE PROBLEMS WITH THE ACCELARATOR PUMP STICKING. I KNOW THERE IS A 450R CARB THREAD BUT NOTHING ABOUT E85 WITH IT. ANY HELP WOULD BE APPRECIATED. THANKS.

WITHOUT MONEY BEING THE ISSUE, WHICH YEAR CARBURETOR WOULD BE THE BEST TO CONVERT TO.

[Wheelie]

The 04/05 carb is what most people use. If you want a FCR, buy a 39mm or 41mm FCR designed for the 400ex and you can have it set up for alcohol.

I'm running an 05R carb and all I did was jet it up significantly--see sig for jetting. I don't run straight E85 because I can't get a needle aggressive enough to ensure the mid-range won't be lean.

[stodd347]

WHAT COMPRESSION ARE YOU RUNNING? I WAS THINKING ABOUT DOING A 426 13:1. DO YOU REALLY THINK I WOULD BE OK WITH THAT. i HAVE THE 400 CARB SET-UP GOOD ON MY RIDE WITH ETHANOL, JUST A LITTLE DECEL POP. I AM BUYING A 450R CARB TODAY, THE 05 MODEL, AND WILL START THE SETUP ON THAT. I WANT TO GET IT AS CLOSE AS POSSIBLE BEFORE I SWITCH TO THE 426 BECAUSE I DONT WANT TO RUN IT TO LEAN. I FIGURE I WILL JUST NEED TO JET UP ABOUT 15-20 JET OR SO TO START, AND MAYBE BUMP THE PILOT UP A COUPLE OF SIZES. THANKS FOR YOUR HELP. WHICH NEEDLE ARE YOU USING? I CANT FIND A HRC NEEDLE. IS THAT WHAT I NEED

[Wheelie]

QUIT USING CAPS, IT MAKES IT VERY DIFFICULT TO READ.

[Wheelie]

I am running about 11.3:1 compression and the HRC needle.

If you intend to run straight E85, bump the jets up about 25-30% over your gasoline setup.

[stodd347]

Sorry, I just leave caps on at work. So do you think I will be ok with the 13:1 setup. I had seen in another post that you said it should be ok. I just want to verify before I switch. thank you for your help

[Wheelie]

If you have it setup right for straight E85, then 13:1 should be fine. HD studs will be a must at that compression ratio, additional cooling would be a good idea as well.

[stodd347]

I dont think there is enough people out there that have done high compression on ethanol to Make me take a chance. I would like to do a 426 13:1, but I think I will do a 416 12:1. I might lose a little power, but I will sacrifice that without having to worry about race gas. Plus I am going to try to use the sparks +6 key on this setup, should help burning that e85. thanks for your help WHEELIE, I will keep you and everyone else updated about the compression with e85

[Wheelie]

Originally posted by stodd347
I dont think there is enough people out there that have done high compression on ethanol to Make me take a chance. I would like to do a 426 13:1, but I think I will do a 416 12:1. I might lose a little power, but I will sacrifice that without having to worry about race gas. Plus I am going to try to use the sparks +6 key on this setup, should help burning that e85. thanks for your help WHEELIE, I will keep you and everyone else updated about the compression with e85

I'll save you some time and money on the Sparks key, don't waste your time. 6 degrees will be too much for 12:1 compression. I tried a Sparks key and it would ping in the mid-range once the engine got warmed up--this was with 11.3:1 compression and about 101 octane. Now I'm running a 4 degree key that I cut myself and don't have any more pinging issues.