frankwelder

Alright I will try to install that next winter...thanks for the tips...Do you if the EGR ligth on the dash, when on, has an effect on fire or something else? Frank

It already cost me a lot of fuel....boosting up idle, progression or pump will take even more fuel...but I know anything about the EA82 engine....can you tell me more about it? It was use on which years? You talk about sensors and computer...My Brat is running like a free bird without sensors, except the one on the dash board...But since I`ve adjusted idle on one barels, the car could be run like that, so I will take my pills for this summer, and try your mods next winter, but I will like to have your info about the EA82... I will check my vaccum meter...but I`m pretty sure of the reads and the scale, but it`s an old sensor that I was using for fuel pressure....but If the vaccum reads are those ones; is there because of the engine cam mods or I may have a sever vaccum leak on the header...I will check it out with acetylyn torch instead of propane torch...

It inch of water, not mercury, and yes the idle is moving when I read 11 at 900 rpm, but steady over 1500 rpm. I must run it like that since I`m out of cash for other big change...I can run it at 1600 rpm idle...But can I try somethings else with jets? I should have kept my original engine and put a 32/36 carb on it....but I install that engine and I want to run it for couple years...

Since both barels work together, I adjust te idle on the first one, than I place the linkage back on (able to because of the slotting on the driver linkage)...so idle works only on one barels instead of both. It actually cut the problem by half...How should I jet barels since one is close and the other is working? Can we post pictures on post?

Here is the vaccum reads taken from powerbrake vaccum fitting on left side of intake manifold... 900 rpm: 11.5 1100 rpm: 13 1500 rpm: 16 2000 rpm: 19 over 2000 rpm: still 19 When accelaration from idle, drops to 0 when the bogging occur and raise to 23 when engine accelarate ok.... If idle set to low (above 1100 rpm), when cooling fans runs and require alternor power...vaccum and rpm will go down together and engine will stall, but ok if idle is over 1100 rpm...

Thanks for brainstorming my problem everybody....I`ll take vaccum/rpm reads tommorow and get back to you with it. I was thinking about barrels today...Thinking of a way to make the second barrel to open up a bit later...I may try to work it on one barrel....but my stock exhaust is not a problem of working the carb on both barrels? I know it`s a big carb for this engine; I baugh this size in case of the engine would be use on something else than a Brat, such a "aeroslider" or whatever need lots of gaz and full throtle operation...Frank

I`m agree with you GD, but since more volume goes in....it has an effect on progression....?...you think am jetted too lean? I feel more like too rich since too much fuel has to be burned and bogging result...no? I like your advice of getting the mixture sensor of 300$, but it doesn`t help me much more to understand what happen in my engine and cause the bogging....what would be your advice on timing? I can try different timing and tell what changes....Frank

Yes both barels open up together...they call it "synchronus" or someting like that...works very well from 3000 rpm to top end on my engine, but I need to try something to improve the idle to 3000 rpm bogging....Aviation camshaft was designed to allow more volume to goes in...works well on high revolution...I need to understand what happens on low speed operation...

That`s what I was feeling too last time....I`m thinking of modifying my accelaration pump; Once I touch the throtle the pump feed some fuel. Maybe the pump should start is job at 1/8 of opening instead of the start. This may reduce fuel delivery from idle to 2000 rpm, reducing bog? I`m not well jeted from idle mixture to 1/4 opening, rest is ok. The transision mode on weber carb is working from idle mixture jet? I don`t understand well this part of the carb...

Hi everybody, I`m new on your site to try to get some advice. I`ve search on the net but maybe someone here may help me more... Here is the short story; I baught a 1986 Brat, Restored the body, and I put a new EA81 engine that has been modified for aviation. ( Camshaft and ported intake manifold, "conventional mods" ) I feed it with a weber 38 mm carb. I place my old distributor on it to get the vaccum advance (on aviation they remove it). I kept my original exhaust system in place. Here is the problem; Whatever where I set my timing, I have a hard time to ride from idle to 3000 rpm...engine bog and want to stop, but runs great from 3000 to 5500 rpm. I feel like the engine was modified to run at 5000 rpm and not at 2000 rpm...but someone may have some advice to me? Thanks