OPS Marine Engines

[Jim Allen]

Terry,

Crankshaft flexing will not cause piston hitting problems. Many people may think that the compression of the gas & the following ignition is stopping the piston at TDC. The things that stop the piston's upward movement at TDC are the wrist pin, connecting rod & the crankshaft. These same parts also stop the piston at BDC. Because of this, the connecting rod is experiencing very high compression & tension forces as the crankshaft rotates. Low radial clearance numbers in the wrist pin, piston boss, upper connecting rod end & lower connecting rod end fits, prevent piston hitting.

Placement of the sealing area can be done inside of the engine's front end or with the system shown in the photo. The steel sleeve, which fits over the crankshaft & is clamped between the inner races of both front bearings once the flywheel is mounted, not only allows positioning of the seal & easy accurate control of it's size, but it also allows the axial play amount of the assembly to be set to a predetermined number. Since all the parts involved including, the front end, the crankshaft, the sleeve & the bearings are made of steel, the total axial play amount can be set at room temperature. This axial play amount remains constant as the engine comes to running temperature because the thermal expansion of the steel parts is the same. Another advantage of this system is that the cantilevered crankshaft is mechanically fastened to the inner race of both front bearings. This would be impossible with an aluminum front end!

Jim Allen

 

[colmarshall]

does any one know which way the disc goes in in relation to the piston at tdc in a ops 90 black head engine?

 

[charles siler]

does any one know which way the disc goes in in relation to the piston at tdc in a ops 90 black head engine?

The disc drive is at tdc.

 

[colmarshall]

thanks Charles .

 

[brad nichols]

I will be selling a brand new old stock OPS 90 blackhead for a friend in a week or 2 for $400 obo, it has been taken out of the bag but never mounted.

Brad

 

[David Bryant]

I've noticed a new, next-generation, 2017 OPS .45 Marine engine available for sale on-line through GotNitro:

http://shop.gotnitroonline.com/BRAND-NEW-2017-OPS-MARINE-45-WORLD-CHAMPIONSHIP-IN-STOCK-587114.htm;jsessionid=966EEB21BCDF033E2B395F56C303BCC1.p3plqscsfapp003?categoryId=-1

From the limited images provided on the web-site the engine appears, visually, to be a completely new 1-piece, front-exhaust, crankcase casting, with a machined bar-stock rear-plate w/drum-valve intake configuration. The carb body appears to be machined from bar-stock aluminum as well.

At quick glance this new OPS marine engine crankcase design appears, to me, to mirror exactly the most recent Picco P45R Marine engine releases (ie. 2011 and 2012, Bluehead w/Black case). It's as if Picco has made a run of new OPS-badged .45 marine engines, with a few minor detailed differences- ie. for example the aluminum flywheel appears to be the original OPS .45 flywheel part; the carb appears to be machined from bar-stock aluminum (instead of a cast-aluminum body). Strangely, the water-cooled head assy shows to have 4 water inlets.

Beyond that this is all we can see. Would be nice to know what the internal components look like

 

[JRXHydros]

The OPS 45 has four water fittings around the cooling cap. They must want a lot of water lol. Didn't see a header.

$350 on eBay

 

[David Bryant]

The OPS 45 has four water fittings around the cooling cap. They must want a lot of water lol. Didn't see a header.

$350 on eBay

Yeah, have never seen a water-cooled head with that quantity of water inlets/outlets. Can't imagine an engine that size requiring such a volume of water for cooling. The equivalent Picco P45R engine (essentially the same head assy) uses 2 fittings/inlets.

In regards to the header, the reseller at "GotNitro" explains (quote): "the new 45 comes with silicone adapter as seen

in pic, and then you just attach your pipe, no other header needed". Hmmm, not sure that will work, especially being the exhaust port length only extends approx. 11.50mm (.452in).

The NovaRossi .46DD exhaust port has a similiar exhaust port extension length approx. = 11.50mm (.452in dia). The diameter measures approx. 20.00mm (with a recessed inner band, gasket retainer, groove dia. approx. = 18.50mm). So the NovaRossi .46DD header assy w/silicone rubber gasket may possibly work on this new OPS .45 Marine.

 

[brad nichols]

Would have to look on the underside of the head to see if there was a divider or it just gives you more line routing options and has anyone tried exchanging parts with the PICCO to see if they fit?? It defenately looks like they are the same.

Brad

 

[JRXHydros]

Wish they still made the grey head 60 OPS,that engine was a beast!

 

[David Bryant]

Would have to look on the underside of the head to see if there was a divider or it just gives you more line routing options

exactly what I was thinking as well- the water-jacket piece may have a machined channel or divider for separate lines, etc.,...

The nice thing, if this new OPS engine is equal to the Picco P45R version component-for-component, we would have a new source for (Picco) replacement parts

 

[JRXHydros]

Would have to look on the underside of the head to see if there was a divider or it just gives you more line routing options

exactly what I was thinking as well- the water-jacket piece may have a machined channel or divider for separate lines, etc.,...
The nice thing, if this new OPS engine is equal to the Picco P45R version component-for-component, we would have a new source for (Picco) replacement parts

You going to buy one?

 

[David Bryant]

Would have to look on the underside of the head to see if there was a divider or it just gives you more line routing options

exactly what I was thinking as well- the water-jacket piece may have a machined channel or divider for separate lines, etc.,...
The nice thing, if this new OPS engine is equal to the Picco P45R version component-for-component, we would have a new source for (Picco) replacement parts

You going to buy one?

if it crosses-over to the Picco P45R I would (for parts)

 

[brad nichols]

Al Hobbs has billet headers that may work with the 45.

Brad

 

[ALLAN YUEN]

Would have to look on the underside of the head to see if there was a divider or it just gives you more line routing options

exactly what I was thinking as well- the water-jacket piece may have a machined channel or divider for separate lines, etc.,...
The nice thing, if this new OPS engine is equal to the Picco P45R version component-for-component, we would have a new source for (Picco) replacement parts

You going to buy one?

if it crosses-over to the Picco P45R I would (for parts)

very interesting wow OPS crankshaft 8mm? or 1/4-28 ?

 

[Shane Bastick]

looks like the new OPS 45 is a step in the right direction , in terms of a new engine

 

[Toru Komatsu]

Here is a pic of some internal parts of the new OPS 45.

Toru

 

[Shane Bastick]

looks good and looks like a balanced crank as well

 

[David Bryant]

yep, looks good

 

[JRXHydros]

Sweet!