Wiseco Vs. OEM Replacement Pistons

[DuckLn]

Which would you rather have and why?

[JohnsonM50]

Which would you rather have and why?
Ive used Wiseco pistons & had no problem. In the 31,8ci deflector type pistons the Wiseco's are lighter but don't have beveled expander type ring. 6-o-1, 1/2 dozen-o-the other? I did get a pair that were .001 different, [matched set?] but you'll find weight difference in the stock pistons at least if not size too. By choice as you asked.. ?, $$'s count to me too but which is better or not I cant say. Good Luck

[DuckLn]

Ive used Wiseco pistons & had no problem. In the 31,8ci deflector type pistons the Wiseco's are lighter but don't have beveled expander type ring. 6-o-1, 1/2 dozen-o-the other? I did get a pair that were .001 different, [matched set?] but you'll find weight difference in the stock pistons at least if not size too. By choice as you asked.. ?, $$'s count to me too but which is better or not I cant say. Good Luck

The reason I'm asking is my buddy races dirt bikes and super bikes and says people in his industry stear clear of them if possible. He didnt go into specifics but I would like to hear from some outboard enthusiasts whether or not they would recommend Wisecos as a trustworthy replacement and whether or not I could expect any performance gain using Wisecos over OEM.

Thanks

[Mark75H]

If I recall, the difference is that Wisecos are cast rather than forged and have a different expansion rate, calling for a different piston to cylinder clearance.

Read the manual, follow the directions and you have no problem ... think you know it all ... the problems you cause must be someone else's fault.

[Powerabout]

If I recall, the difference is that Wisecos are cast rather than forged and have a different expansion rate, calling for a different piston to cylinder clearance.

Read the manual, follow the directions and you have no problem ... think you know it all ... the problems you cause must be someone else's fault.

I think its the other way around Sam, OMC might be hypereutectic but not forged
All Wiseco's are forged I am pretty sure Hence the issue of getting piston to bore clearance right with them.
Personally I would like to use ones made from the new material that Etecs are made from

[JohnsonM50]

I just looked over a Wiseco instruction sheet, couldn't find anything on whether forged or cast, the piston itself seems too fine to be cast even where it wouldn't be machined or matter. The instructions do say piston to bore clearance is specific to Wiseco's & all ports should be champhored. Also noted that if the motor is modified more clearance is advised. It gave reference to the #'s information but I don't have that, been awhile since I used them.

[JohnsonM50]

I think its the other way around Sam, OMC might be hypereutectic but not forged
All Wiseco's are forged I am pretty sure Hence the issue of getting piston to bore clearance right with them.
Personally I would like to use ones made from the new material that Etecs are made from

Wiseco Manufactures High Performance Forged Pistons [copy & pasted]

[mercguy]

The reason I'm asking is my buddy races dirt bikes and super bikes and says people in his industry stear clear of them if possible. He didnt go into specifics but I would like to hear from some outboard enthusiasts whether or not they would recommend Wisecos as a trustworthy replacement and whether or not I could expect any performance gain using Wisecos over OEM.

Thanks

Wiseco's are indeed a FORGED piston and require a little more clearance than a cast pistons. The break in procedure is VERY critical with Wiseco's. As to which is better, well that depends on the motor manufacturer. When building Mercs, I prefer the Mercury ART pistons (when available) over Wiseco's any day...........Vertex seems to be a good piston also..............

[Powerabout]

The reason I'm asking is my buddy races dirt bikes and super bikes and says people in his industry stear clear of them if possible. He didnt go into specifics but I would like to hear from some outboard enthusiasts whether or not they would recommend Wisecos as a trustworthy replacement and whether or not I could expect any performance gain using Wisecos over OEM.

Thanks
Ask your buddy if he prefers OEM or has another after market supplier?

[DuckLn]

What other manufacturer's are there for 2 stroke outboard pistons? Motor is a 30 HP 3 cylinder.

I did view the Vertex website and it appears they do not make pistons for small outboards such as this.

[marchettih2o]

ProMarine in florida makes a good piston...g

[Randy Aveline]

Wiseco's are indeed a FORGED piston and require a little more clearance than a cast pistons. The break in procedure is VERY critical with Wiseco's. As to which is better, well that depends on the motor manufacturer. When building Mercs, I prefer the Mercury ART pistons (when available) over Wiseco's any day...........Vertex seems to be a good piston also..............

are the vertex pistons still available for the 50 hp mercury's ?? i thought i heard they were NLA is this true ??

[mercguy]

What other manufacturer's are there for 2 stroke outboard pistons? Motor is a 30 HP 3 cylinder.

I did view the Vertex website and it appears they do not make pistons for small outboards such as this.

30hp 3cyl what?????? brand?

[DuckLn]

30hp 3cyl what?????? brand?

30 HP 3 cylinder 496 CC Yamaha. Thanks.

[Phil McDaniel]

Randy, From my last order from Pro Marine/Vertex they have plenty now. They were only out of the .015 over's. I know Van Over bought a lot when the shipment finally came in.

I am now placing an order for some Merc. 44 pistons. They are available in std./10/20/30and 40 overs. Daren, they are just like the ART 2 ring Mercs. I have compared and tested in 2/ 44's and are just fine. they are made with 7 degree taper on rings. Super piston. Can sell for $64.95. I have to buy in quantities but pistons are already made.

Before the APBA Nationals I sold out of my .030 Wiseco 3 cyl. Mod 50 look-a-like's and are sending some .040's out first of the week to an NBRA driver. (don't know if he wants me to tell who). Have some 20's and 40's left though.

Food for though---- The only way I got the Wiseco pistons to work( over 200 out there) was to increase the taper to the same as the Mod 50 by OMC. I feel a forged piston needs the taper for expansion. The cast varies as to the silicon content.

Let me know if I can help anyone with these merc. 44 pistons. Can have as early as the middle of next week. I've got 10 pcs. of my order sold. Should have plenty though.

Phil McDaniel cell 843-446-7767 home 843-650-0400---------------------Thanks

[mercguy]

Randy, From my last order from Pro Marine/Vertex they have plenty now. They were only out of the .015 over's. I know Van Over bought a lot when the shipment finally came in.

I am now placing an order for some Merc. 44 pistons. They are available in std./10/20/30and 40 overs. Daren, they are just like the ART 2 ring Mercs. I have compared and tested in 2/ 44's and are just fine. they are made with 7 degree taper on rings. Super piston. Can sell for $64.95. I have to buy in quantities but pistons are already made.

Before the APBA Nationals I sold out of my .030 Wiseco 3 cyl. Mod 50 look-a-like's and are sending some .040's out first of the week to an NBRA driver. (don't know if he wants me to tell who). Have some 20's and 40's left though.

Food for though---- The only way I got the Wiseco pistons to work( over 200 out there) was to increase the taper to the same as the Mod 50 by OMC. I feel a forged piston needs the taper for expansion. The cast varies as to the silicon content.

Let me know if I can help anyone with these merc. 44 pistons. Can have as early as the middle of next week. I've got 10 pcs. of my order sold. Should have plenty though.

Phil McDaniel cell 843-446-7767 home 843-650-0400---------------------Thanks

Phil, are the Merc pistons you have the small or large wrist pin type??? Wiseco made?

[Phil McDaniel]

Daren, They are the large wrist pin and other than one(1) casting mark, they are just like the Merc. 2 ring piston. They gram out lighter(2 grams) than the Vertex. Looks like Merc., just cheaper in price. They are made over seas and supplier wont tell me the mfg. In regards to no info, I don't know the piston composition. Not only the Mercs but others for Yamaha and OMC(some fishing/mostly HP) we have had no failures. Please don't be mislead by the price. I had to become a dealer to be able to offer to the race this price. Thanks Phil