3 litre wolf efi crankcase injected 3 litre build

[mrcrsr]

Ronnie I'd like to leave the 2.5 ignition complete, but use the trigger to give the wolf position information but I can't think how I would do it. Then let the wolf have the capability to retard the stock ignition timing and lock the pickup at full advance

[PanRonnie]

don,t know why on earth you would want to do that as i find the original trigger a horrible system but anyways
having the bias voltage shorted to ground advances ignition
so you would fix the timer base to 0 dgr BTDC or lower ATDC
then have a transistor between the bias voltage and ground
the gate of the transistor connected to a PWM output of the ecu
now hopefully this works
at a 0% the gate is not activated and the bias voltage is not pulled low
and as you increase the percentage of the PWM simulates a resistor in-line where the ohm value becomes lower
you could maybe trim the advance with resistors in line with the transistor so that at 100% duty cycle you have a fixed advance
this would also be a build in safety if something goes wrong with the ecu
the engine could never over advance over the resistor value
you would still need a missing tooth wheel setup for timing but that,s easy enough

i would seriously advice building a test setup where everything is installed except the engine itself

[PanRonnie]

you could at-least test the theory pretty quick
if you have such an engine around
disconnect the timerbase fixate it
and then put a 10 KOhm variable resistor between the bias connection and ground
and see what happens with a timing light as you turn the resistor from 10 Kohm to 0 Ohm

[powerabout]

Anyone got any data for calculating the plenum on a multi cylinder 2 stroke?

[PanRonnie]

Anyone got any data for calculating the plenum on a multi cylinder 2 stroke?

http://www.jenvey.co.uk/jenvey/why-n...-throttle-body

[powerabout]

http://www.jenvey.co.uk/jenvey/why-n...-throttle-body

Pan I couldn't see anything there, only pro and con of single inlet?

[PanRonnie]

Depends on the amount of horsepower at what rpm
but instead of reinventing the wheel why not buy the throttle body of a mercury engine of the same horsepower and rpm you are targeting!

[powerabout]

Depends on the amount of horsepower at what rpm
but instead of reinventing the wheel why not buy the throttle body of a mercury engine of the same horsepower and rpm you are targeting!

single throttle body cfm is not the issue its how big should the box be, there are rule of thumb stuff for 4 strokes and I think the Merc front horn is not such a clever design
maybe a down draught ( like a later Merc) will suit the 90 degree looper down angle reeds with the longer path to the bottom two which makes up for the shorter exhaust?

[mrcrsr]

I just machined a 3/4" spacer plate out of an optimax reed plate to fit between the intake and reed plate. Figured I'd try to expand the size of the plenum volume and see what it does.

[Dave Strong]

Be sure to let us know.

Dave

[mrcrsr]

hoping to get it back together today, it is a lil chilly here(hi of 70) so i probably won't get out in the boat until it warms up, i have to run the other skater too with the hi slip numbers with the 1.62 gearcase and see what it does as well. i figure its about time to finish tuning the engine, i'll probably try to run the wideband 02 sensor on it this time as well.

[R.grover]

sounds good keep up the info

[mrcrsr]

i had pulled the whole intake with the reed plate, went to clean everything last nite to put back together, and found a couple of reed cages with open reeds on them(like .050-.080 open) which is weird, this engine was redone a year ago and didn't go together like this. i have 300x rubber coated cages in it. last time, i had a couple that were like that and lap sanded the rubber off the problem ones, and those are fine, it was a couple this time with the rubber still in place. ended up lapping them and putting it back together and it is fine. hopefully i'll get the engine back together today.

[Liberator*21]

Quote:
hoping to get it back together today, it is a lil chilly here(hi of 70).....Seriously Charlie.........?????? It's freak'n 17 degrees here, and I'm not feel'n one bit sorry for ya cause it's gonna be 70.......

Had the same issue with my motor last year using lapped cages, 8 pedals total were open like yours (.05-.08), I couldn't find a reason for it either, they were OEM C/Fiber Reeds. I put in new set of CCM reeds but it'll be awhile before it gets wet.

[mrcrsr]

17 is cold gary! I was going to try and run the other skater today, but Obama is here, staying at a riverside golf course where I normally run the boats, last time he was here the coast guard and everyone else was over there, I can even heare the fighter jets from my house, I can imagine running 100 through there could create some problems!