Carb adjust
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Carb adjust

  1. #1
    Retired Air Force Master Sergeant's Avatar
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    Default Carb adjust

    Got to test my AFR today and it looks to be lean. I have a single Dominator carb using E85. The AFR is 9.7 but should be closer to 8.7. How many jet sizes up would you think might me where I need to be?

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    What AFR meter are you using and do you have it set up to read for E85? I know the one I have, even when I am running E85 still reads on a gasoline scale.

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    It is an RPM Data Logger. It is not set up any different to read E85 you just have to look for different readings compared to other fuels.

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    OK, I just wanted to make sure you were not seeing those actual numbers on a Gas scale as that would have meant you were WAY fat. Now that I think about it, I don't know if it would even run that fat. LOL Anyway, I have no idea about how much of a jet change it will take. Looks like you get to be our guinea pig. Let us all know when you find out.

    Paul

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    The guy that converted my carb said it is not lean, it is rich. He said it should be closer to 11.2 and to try 4#s as a start.
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    I am having trouble getting a consensus on where the A/F ratio should be for an N/A E85 engine.
    Performance Carburetor says: 11.2
    E85Carbs Says 7.2
    RPM Data loggers say 8.7 to 9.2

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    Quote Originally Posted by Master Sergeant View Post
    It is an RPM Data Logger. It is not set up any different to read E85 you just have to look for different readings compared to other fuels.
    It seems I was wrong here. Some meters are calibrated for gas and others for E85. You can use either one for any fuel you just have to know what # to look for as each meter will show a different # for the same fuel. In my case my meter is set up for E85 so the # I am looking for is closer to 8.7.

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    Quote Originally Posted by Master Sergeant View Post
    It seems I was wrong here. Some meters are calibrated for gas and others for E85. You can use either one for any fuel you just have to know what # to look for as each meter will show a different # for the same fuel. In my case my meter is set up for E85 so the # I am looking for is closer to 8.7.


    Hey Tim im using the autometer programmable afr gauge, the paper work for the gauge says that for ethanol, the afr should be at 9.0. My gauge reads 8.9 +/_ 0.1 at idle and cruise (3500 rpm). Talked to Ron at PC and he said the same thing , that i should be right at 11.0. I wonder how much difference there is between strait ethanol and e85. Ive seen my gauge go as low as 12.7 at wot.

    I have a huge dead spot (stall) off the line and it tries to die when i get off the throttle hard at the top end, have feather the throttle to keep it from staling

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    Quote Originally Posted by Reservoir Dog View Post
    Hey Tim im using the autometer programmable afr gauge, the paper work for the gauge says that for ethanol, the afr should be at 9.0. My gauge reads 8.9 +/_ 0.1 at idle and cruise (3500 rpm). Talked to Ron at PC and he said the same thing , that i should be right at 11.0. I wonder how much difference there is between strait ethanol and e85. Ive seen my gauge go as low as 12.7 at wot.

    I have a huge dead spot (stall) off the line and it tries to die when i get off the throttle hard at the top end, have feather the throttle to keep it from staling
    I had that same problem. When I checked my fuel I was getting E90 from the pump so I added some gas to get it to E85. This fixed the staling problem for me. About the AFR, I am skeptical about the lean recomendation from Ron. I richened up the carb and will test this weekend.
    Last edited by Master Sergeant; 03-09-2013 at 01:19 PM.

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    Quote Originally Posted by gn7 View Post
    Lambda looks better and better all the time doesn't it.

    Hey Bob i can program my auto meter to work off the lambda scale, Ive been reading my paperwork trying to figure it out. It looks as thou I set the afr to were i want it, then switch to lambda. Dose this sound right? If im reading it right, I should tune for 1.00?

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    Quote Originally Posted by Reservoir Dog View Post
    Hey Bob i can program my auto meter to work off the lambda scale, Ive been reading my paperwork trying to figure it out. It looks as thou I set the afr to were i want it, then switch to lambda. Dose this sound right? If im reading it right, I should tune for 1.00?
    No. 1.00 is stoich. Power will be some number less than 1.0 For example, 1.00 on gasoline would be around 14.7 to 1. Not the best power ratio.
    Different fuels have max power at different Lambda. Check with Unchained. Thinking its probably closer to .80 Lambda



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    Last edited by gn7; 03-08-2013 at 11:14 PM.

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    This might help
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