Johnson "70mod"

**filthy phill** · 03-02-2017

are these white plastic cards staying on
and what is that blue filler

**hupiveneilija** · 03-02-2017

Yes they stay, are between reedstops and frontpiece. Dont go anywhere.
Blue thing is marine epoxy. Same stuff on the crankcase.

**hupiveneilija** · 03-07-2017

What about egt meter for a tuning aid? Any help with that. And is there some target temp to aim or is it dependable for the mods i have made?

**filthy phill** · 03-07-2017

temp needs to be 140 ish if its too low its going to wear out fast. the 56 usually keeps good temp as long as good thermostat is in the motor.

DO NOT RUN WITHOUT THERMOSTAT.

**hupiveneilija** · 03-07-2017

Egt; ExhaustGasTemperature!

**LittleCharger** · 03-07-2017

Originally Posted by hupiveneilija

Egt; ExhaustGasTemperature!

I'll quote Dave Bush on this one

"Pyros are a good reference tool

Yes and no. Most likely it will be dead before you see any temp changes even with fast pyros if bad detonation is happening. Temps usually drop a little then it dies. Sometimes you see a slow rise then the drop... Bottom line we have found when lake testing you have to take the time to do it the old fashion way and look at the piston tops and spark plugs period. A few minutes here saves thousands. Forget about the pyro. Pyro placement is a complicated thing in itself. Also, we have found you need a pyro in each cyl. with a fast hertz logging rate to do it right. If you can , do it,it is good info but it wont keep things from blowing up. Only you can. Or if you have det sensing you see it in real time (and if detonation is present) you simply let off the gas, change the fuel or timing and watch the rattle go away..We used to hurt alot of parts when living only by the Pyro. Now we look at it more for reference for cylinder to cylinder mapping. Hope that helps..... "

**hupiveneilija** · 03-07-2017

Thank You LC, just what I wanted to hear.

**filthy phill** · 03-08-2017

will you be putting finger ports in this motor ? if so how will you be doing that.

**hupiveneilija** · 03-31-2017

Things go forward. Just use grease to get those needles in place. Foto will show how ive grinded rods to be even. Use old pistons with new rings and honed the sylinders.

**filthy phill** · 03-31-2017

Was it a flex hone with small balls or 3 leg hone.
Are you sure the rods are still good at the crank end on the inside ? From pic looks like chrome has worn away.