24 hp onan

[anderkart]

Hey good job man!

Sounds like your old condencer is fine. I think your old coil fired each plug together and you could install an aftermarket (single outlet) coil with your costom homemade 2 into 1 attachment idea.

Your points are probably getting hotter cause you need to install a ballast resistor in-line to your coils + terminal... or better yet just buy a coil for any 1960's 12 volt Ford product and it'll have a resistor already built into it. (your old coil probably had a resistor like old Fords do)

 

[zanegrey]

the nissan coil have a pre inline ballast ..my i can wire it in..

still charging my bat. right now..

i have to get fuel to it as well so do u think starting it with ether will be ok ?

 

[anderkart]

Yeah you can probably start it with most any coil. The deal with trying to properly match resistors/condensers is to get a nice hot spark while still allowing your points to last as long as possible.

 

[zanegrey]

i noticed i am only getting an orange spark not a nice crisp blue one..

i have cranked it and got it to sputter but no full on start yet..

there is what looks like a vent at the top of the engine that blows air with each crank

is this a pcv valve of sorts and does it just vent to the air or does it hook into what might be a breather cover??

click on pic to make it bigger..

i have circled what i am referring to....

 

[Kaptain Krunch]

while one is firing the other is completing and pushing out exhaust.

Some twins are like that but with some, such as the older wisconsin robin twins fire at the same time, so both cylinders went through the compression, exhaust and intake strokes at the same time.

Yes the plug should fire on both cylinders at the same time, theres no way around that with just one set of points.

EDIT: i feel dumb, didn't even see Page 3

That should be your crank case breather, i have no clue exactly what its supposed to look like, but either way it should not effect it running.

 

[zanegrey]

do u think the orange spark as opposed to a blue spark is something to worry about??

 

[Kaptain Krunch]

weak orange spark is a bad thing, may not run right/at all.

 

[zanegrey]

upon more tinkering i am finding that the gas is not necessarily getting to one side ..

i discovered this thing had a fuel pump on it as well..

so maybe tomorrow i will remove the intake manifold to see if there are any obstructions.

i noticed that one of the plugs is just a little wet with gas and the other is a getting sooty but not wet..

with as much gas as i have poured down the carb it should be getting wet..

i also noticed that the base of the carb leaks a little bit of fuel each time i pour it in so maybe there is a blockage some where..

i am fast running out of day light. so i will let my battery charge all night..

thanks to everyone for there comments and suggestions..

 

[zanegrey]

well i am seeing a slight blue tinge to the spark and i will clean them up and regap them to be sure..

i have got it to sputter i was kind if thinking my weak bat may be the cause of the weak spark..

i was considering using a different bat for the spark and another one to crank it..

 

[BriggsTwins]

cant wait! wanna hear that thing kick

 

[anderkart]

i noticed i am only getting an orange spark not a nice crisp blue one..

i have cranked it and got it to sputter but no full on start yet..

there is what looks like a vent at the top of the engine that blows air with each crank

is this a pcv valve of sorts and does it just vent to the air or does it hook into what might be a breather cover??

click on pic to make it bigger..

i have circled what i am referring to....

If you connected up that Nissan coils external resistor, it might be lowering the coils incoming voltage too much for firing both plugs simultaneously. (try it w/o the resistor if possible)

I was thinking if you go buy a non-Onan coil, meyby you should go ahead and get a non resisted coil to hopefully get a hotter spark for firing both plugs like this. Most any 1960's 12-volt Chrysler product coil should be non-resisted. Then if it ran ok but burnt your points out too often you could always experiment instaling different value ballast resistors/condensers to hopefully find a balance of strong spark and reasonable point life.

You might spring for some new plugs too.

That's a pretty large breather. I'm not sure here, but you may find you need to rig up through a PCV valve to get the engine to run right. (they're cheap and its worth a try anyway / you'd install the PVC valve in the direction so air can blow out, but not suck back in)

Although its possible, I kinda doubt if one side of your intake manifold is plugged with anything. Your primer fuel might have only ran down one side because of the engine sitting at an angle or even because of a slightly up-hill design of that (dry-side) intake manifold runner. Probably wanna fix that "carbs base leak' though.

 

[BriggsTwins]

i know when i run the twin the manifold gets condensated, and in cold i can get it frosted!

 

[zanegrey]

i have not put the ballast on yet..

when i started to clean this thing up i found that some kind of animal was living it the shroud..

i will check to make sure it is level..

the breather has a flap in it that might be the check valve but i will check it again..

do you think that would coz it not to start??

 

[zanegrey]

i have also noticed that when i put my finger over the spark plug hole and crank it ..it has very good compression ..

i will put the original parts on it if i can get it to running ..

i just do not want to spend 100 dollars on a coil and find out that there is something wrong with the engine itself..

 

[zanegrey]

i have found out that what i thought was an lo oil shut down is a rectfier for charging the bat..

i this correct????

i have circled the box...

 

[anderkart]

I dont know for sure if any single outlet coil will corectly fire 2 plugs, but I dont see why your points and condencer couldnt be wired to a pair of car coils.

Yeah that "breather flapper" might act as a check valve and help it run better. (try blowing into it to see if its working or not) I'm not sure if this malfunctioning could make it run poorly or not start, but it might.

I have no idea about your rectifier thing-amado.

 

[zanegrey]

the breather seems to be working correctly..

 

[Kenny_McCormic]

You don't even need a breather/PCV valve for it to run. Learned that the hard way putting a new plenum on a GM 3.8(PCV is built into plenum, forgot to install valve), it ran, but it outsmoked a fully loaded gravel truck.

 

[BriggsTwins]

hey kenny hows the suicide runner?

 

[zanegrey]

well suucess of sorts today..

with the battery fully charged and an extra big dosage of gas down the gullet(carb)
it fired up today ..

it was a full on start so i am taking that as a step forward ..

it is on the bench so it wanted to move around a little but not too bad..

i does have a fuel pump but it is not good ..

do you guys think it will run being gravity feed for a while ??

enough for me to get it to idle ??

does any one know the rpm range for these engines??

with out the mufflers on it sounds like a monster..