Dominant wiseco piston?

[Blackbruin]

Gonna open up my trusty old 2171 Johnny and go over the old gal. Was wondering if the dominant piston is for real, as in is it worth the $110 for what it is. I would like to woods port it to, and see what I have been missing for the last 12 years I've ran it.

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[huskihl]

Gonna open up my trusty old 2171 Johnny and go over the old gal. Was wondering if the dominant piston is for real, as in is it worth the $110 for what it is. I would like to woods port it to, and see what I have been missing for the last 12 years I've ran it.

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@Definitive Dave has designed pistons through wiseco, also. Maybe he can shed some insight as to their effectiveness

 

[Mike Gott]

@Definitive Dave has designed pistons through wiseco, also. Maybe he can shed some insight as to their effectiveness

The piston Dave has is definitely better than the dominant one. I have a used Dominant one I’d sell reasonably if you want to go that route

 

[Blackbruin]

If Dave's is better than that's the route I would wanna go. If I cannot get one of Dave's than I would definately grab your dominant piston....

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[mdavlee]

They’re ok if you want a drop in piston for compression increase and don’t want to stretch the transfers around on one side. They’re not better than a base and chamber cut flat top. I used a half dozen and they do work but they’re spendy just like Dave’s. Both have their purposes depending on what you want out of the saw.

 

[Blackbruin]

What I want is to liven it up without being undependable. So your saying delete the base gasket, port and do the transfers and it will be just as good if not better?

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[huskihl]

What I want is to liven it up without being undependable. So your saying delete the base gasket, port and do the transfers and it will be just as good if not better?

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Imo, it'll be better ported with a flat top piston. If you get the pop up version, part of the pop up will have to be ground off if you plan on having the base cut so it'll clear the spark plug. So it all depends on what your plans are

 

[huskihl]

http://www.ebay.com/itm/323419894404

 

[Mike Gott]

Kevin’s right, that’s why I took mine out and put Dave’s flat top in it.
For a work saw I’d just port it and get a 371 single ring piston for it

 

[Blackbruin]

Oh wow....lol
Okay, so I'm just gonna call AWOL and let him do their thing. Thanks guys.

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[mdavlee]

I used one and with just setting squish cutting the base it cleared the plug no problem and made 185 lbs of compression. Another I cut .010” and it made 195. Any of those takes more warmup time than the meteor or OEM pistons.

 

[drf255]

Them fancy pistons are an add on to a full out race saw only IMHO. You’ll be much happier with Allan rubbing it.

I wouldn’t buy a thing from Dominant. Not sure they really know what they are doing. Nice guys but their advertising of parts isn’t always so clear.

Cant beat Dave for everything.

 

[blsnelling]

Imo, it'll be better ported with a flat top piston. If you get the pop up version, part of the pop up will have to be ground off if you plan on having the base cut so it'll clear the spark plug. So it all depends on what your plans are

This not necessary at all.

 

[huskihl]

This not necessary at all.

So I'm imagining it?

 

[huskihl]

This not necessary at all.

There may possibly be different heights of the pop-ups that they offer, or have offered. I'm not sure of that. But on the one in question on a 2071 jonsered, the pop-up will definitely hit the spark plug if the chamber is cut .030

 

[blsnelling]

There may possibly be different heights of the pop-ups that they offer, or have offered. I'm not sure of that. But on the one in question on a 2071 jonsered, the pop-up will definitely hit the spark plug if the chamber is cut .030

You didn't mention that you used a pop-up piston in a cylinder with the chamber cut. That's an entirely different ballgame.

 

[huskihl]

You didn't mention that you used a pop-up piston in a cylinder with the chamber cut. That's an entirely different ballgame.

Ah. I see where I only wrote "base" cut. I meant both base and squish

 

[Mike Gott]

Allan ports a dam strong saw for sure

 

[bustedbelt]

Hi, this is Bill from Dominant. We appreciate your comments as they help us make better products. We now have two pistons - both made by Wiseco - the version 4 of the 372xp piston - which will be out in March (finally) and the MS460 piston. We've got some other products up our sleeve as well. We are also looking for saw builders that would like to stock our products through the Dominant Premier installer program. You can get in touch via [email protected] - thanks!

 

[rayjay257]

Imo, it'll be better ported with a flat top piston. If you get the pop up version, part of the pop up will have to be ground off if you plan on having the base cut so it'll clear the spark plug. So it all depends on what your plans are

Why not source a racing sparkplug that doesn't project very far into the combustion chamber ?