1999 225JOHNSON vinnie broken rod

[SPANNA]

Hi guys 225JOHNSON vindicator broke no2 conrod done 1 1/2 hours racing ,wisco pistons 138 psi 18dec timing had new rod bolts on assemble broke bottom off rod rod bolts are broken in half i did drive extra lap after it went off thinking it was electrical .the motor is on marathon boat races are 100km each any ideas havent broken a rod before but have broken pistons untill i went to forged any ideas ? Cheers
it wasnt a overrev as it was a flat race

[perfmarine1]

Did you use the OMC Rod Assembly Fixture to install the rod bolts?

[baja200merk]

What RPM were you turning it?

The 99 had small rods.

What was the piston to cyl clearance and what temp were you running it at? Any sign of the piston sticking?

[SPANNA]

what rpm were you turning it?

The 99 had small rods.

What was the piston to cyl clearance and what temp were you running it at? Any sign of the piston sticking?hi only 6300 or 6400 rpm pistons good clearance not picked up may be it was age i dont know how old the rods are
blown this a few times mosty because i havent put my lwpu nose cone on my lighten box
bobs have sent me photos of how to fit as i have to trim front of gear box

[SPANNA]

did you use the omc rod assembly fixture to install the rod bolts?
no i dont have that tool but i have built a lot of these, i align at least 3 sides with a pick to feel if fitting correctly

[R.grover]

Tim what rods are you running? short or long? using 3/8 bolt right?

[SPANNA]

tim what rods are you running? Short or long? Using 3/8 bolt right?
hi rick just standard rods i think the etecs have 3/8 bolts not shore

[baja200merk]

If it's been blown a few times did you replace the rods on the holes that blew?

New brp long rods have 3/8 bolts like the 3.3/3.4 short rod

[racer]

99 would have the light long rods, I would be using the big rods if racing. The 5/16 bolts on the old big rod are fine we have run them well past 9k. If the bolts broke either the bearing was sliding/came apart or rod cap was bad. If the piston is damaged could be another story.

[SPANNA]

99 would have the light long rods, i would be using the big rods if racing. The 5/16 bolts on the old big rod are fine we have run them well past 9k. If the bolts broke either the bearing was sliding/came apart or rod cap was bad. If the piston is damaged could be another story.
5/16 bolts i think you are right it has opened up the rod cap and bottem of the rod so both halfs are flat
i have been given this omc part number for a better rod 18-4148-1 does anyone know what these are out of cheers

[SPANNA]

if it's been blown a few times did you replace the rods on the holes that blew?

New brp long rods have 3/8 bolts like the 3.3/3.4 short rod
yes i replaced the rod every thing but with second hand ones as i had stripped another engine for parts

[R.grover]

Tim measure the rod for us so we know what you have.

[baja200merk]

What is there to measure? It has to be long/small rod from 99. It wont rotate with short rods.

[R.grover]

Baja What im trying to say is hes not sure on what road he has and he may not even have the block he thinks he dose.

[SPANNA]

up date gave up on that block i have over time put 4 liners in it only one was piston broken the rest were overheat from water pick up issues
took it to the scrap metal man last weekend
so will look at whats left and decide what to do
i have a 225 fitch 3.3 liter block with a custom made front half with 6 x 235 twin throat carbs and 7 petal merc reed blocks -which i cooked as well
so i have stripped this and it not to bad so am taking it to the guy who built it to locate correct parts to fix and will run this will post photos when back together next month thanks for the advise cheers

[baja200merk]

Are you using short or long rods? What are you using for pistons?

[R.grover]

Tim are you taking it to OD?

[Smoking Joe]

Tim, Owen has a race 225hp engine for sale right now, $6K.