Parts compatability between engines (keeping the old ones running)

[PaulHail]

I picked up a Picco P-90 and have read of their weak con rods and issues with the lower end bearing brinelling the crank pin. I've also read the solution back in the day was to swap out the stock rod for an RPM. Well with RPM no longer in business and folks still running these engines gobbling up the old stock, I've started to think of alternatives.

I was wondering if anyone has put together a chart of parts that are compatible between engines, if there are any. If I could just swap in a current production CMB or NovaRossi rod that would be great, but I have no idea what parts may be compatible.

 

[Andy Brown]

Nothing is compatible with the old Picco 90s. There are still a few engines and parts floating around. Just have to ask around in the boating forums.

I recently modified a pair of new (never run) Picco Hydro 90s for a Twin. Those 25 year old engines still have potential if set up correctly.

 

[jim kapanowski]

I have rods for those i believe send me a picture of your rod and we will go from there i have aluminum and steel i have great luck with the steel ones FYI (new)

 

[PaulHail]

Thanks Andy,

My plan is to use the engine to get the JAE 90 I'm building set up, run a few races for a season and then upgrade to a modern engine. If I can get that done with the engine by swapping the lower end bearing and say keeping to 25% nitro it'll serve it's purpose. The engine looks in pretty good shape with no signs of porting or detonation and a muffled pipe that wasn't cut down so my guess is it was likely run as a sport engine.

Jim,

I'll have to tear the engine down a bit further to get the rod out. It's a steel rod with caged needle bearing lower end.

 

[jim kapanowski]

ok thats what i have to i don't think i have needle bearings though just the rods and the aluminum i believe are RPM

 

[PaulHail]

Jim, I'd be interested in an RPM rod.

Do you know what the shaft thread is for the P-90? The engine came with a square flex nut for a 3/16" cable and I'll be running a 1/4" cable.

 

[brad nichols]

8 mm ( think? It is metric

Brad

 

[David Bryant]

I have rods for those i believe

what about rods for a 1980's Picco P67 or P80 marine engine? I believe they measure approx. 1.60in (40.64mm) center-to-center (+/- a few thousandth's)

 

[jim kapanowski]

David that pico 80 and rod what is up with that stuff are you selling or building ?

Paul i will check on the rods and let you know, same for your question on shaft size i have a new 90 hydro motor i will research this

 

[David Bryant]

David that pico 80 and rod what is up with that stuff are you selling or building ?

It is brand-new, in-the-box, original 1983 stock.......

 

[PaulHail]

Jim,

Let me know what you figure out. I'd be interested in one or both of the RPM rods if they'll work in the P-90.

Thanks

 

[Bob Kensill]

I have some misc rods. Send me big and small IDs and center to center distance. Maybe i have one

Sent from my VS985 4G using Tapatalk

 

[jim kapanowski]

hey paul the rods are RPM does your motor have the bolt on exhaust header? let me know

 

[PaulHail]

Ken,

Yes the engine has the bolt on exhaust header

 

[PaulHail]

My micrometer and expanding gauges are still in storage so I had to use the jaws of a caliber so I'm sure I'm off a few thousandths.

Little end 0.277" / 7mm

Big end 0.357" / 9mm (for plain bearing i.e. rpm rod

Big end 0.475" / 12mm (stock rod needle bearing)

CtC 1.814" / 46 mm

 

[jim kapanowski]

ok i will mic on up the motor you show is what there for but i will double check

 

[jim kapanowski]

ok i have a pic but can not figure out how to load on a reply my measurements are so if you give me an email address i will text it to you

.275 sm
.354 lrg