pro x pistons?

[FireHead]

One of my favorite links that can shed some light on the differences between the two piston types.

LINK

 

Awesome link! (as usual from RNBRAD)

 

I would add a sub-group of Billet to the Forged Piston category in that pistons can be also made from a billet in addition to a forging. Most small quantity racing pistons are actually made in this manner. The article at the link you provided does not go over the cam turning process which is unfortunate as it is very interesting (maybe just to my nerdy self). :thumbsup:

[ohiobanshee]

One of my favorite links that can shed some light on the differences between the two piston types.

LINK

Good link brad. :thumbsup:

[RNBRAD]

Thanks fellas. It just makes better since to look at all options than to go one way or another for all situations. It's kind of like piping to your port. Not one pipe is the best for all ports, same with pistons and motors.

[FireHead]

Thanks fellas. It just makes better since to look at all options than to go one way or another for all situations. It's kind of like piping to your port. Not one pipe is the best for all ports, same with pistons and motors.

 

I agree. RNBRAD always has the best neutral, informational, links to add to most discussions. :thumbsup:

 

RNBRAD I want to apologize to you if I came off like a twat when I replied to your post. I got a little bit worked up at blaster 668 and I think I let it carry over into my reply to your post. :shoothead:

[Banchetta]

Duncan racing explained it to me years ago that the cast piston heats and expands at the same rate as the cylinders, where as the forged pistons heat up faster than the cylinders causing them to expand quicker....so if some knuclehead revved the motor up while it was still cold w/ a forged piston, it would cold sieze or wear the rings much faster....

 

After this being explained to me and after I already cooked about 5 motors w/ weisco pistons, I decided to go w/ Pro-x.....Rebuilt the shee, went 5 years on a set of pistons and only lost 3psi on both cylinders.....Rebuilt a buddies bike who insisted on wiesco, did a compression test, both cylinders were the same, ran some heat cycles, broke it in, still the same.....Jumped on his shee one day and throttle stuck when he started it up, killed it immediately.....got the problem fixed, checked the compression for the hell of it....Lost 3psi in one cylinder.....That alone was enough proof for me. Besides that, how many events I have gone to, to watch people get on to a cold shee and take off wide open w/ no warm up...or 10 seconds of warm up.....

 

 

Moral of my story is......Cast pistons in a shee...wiescos suck. They are wayyy to tempermental for a shee...Forged pistons are lighter and that is why people go w/ them, but if you lose 3psi on one mistake, then everything you gain, you've lost....I've never had a shee blow up that I've put together w/ cast pistons, but I've never had a shee w/ forged pistons not blow up....I've owned 4 shees and I don't favor anything unless I see it for myself. I'm not saying cast are indestructable, I'm just saying I've had great success and performance over years of pure abuse.....Good luck

[NYUK]

to each his own i guess, i have had a pro x piston shatter in 1,000 pieces at 111 mph on an 11 second quarter mile pass. and another crack all the way through on my play bike.i never had a problem with wiseco on a high strung bike.

[mpbanshee]

Duncan racing explained it to me years ago that the cast piston heats and expands at the same rate as the cylinders, where as the forged pistons heat up faster than the cylinders causing them to expand quicker....so if some knuclehead revved the motor up while it was still cold w/ a forged piston, it would cold sieze or wear the rings much faster....

 

After this being explained to me and after I already cooked about 5 motors w/ weisco pistons, I decided to go w/ Pro-x.....Rebuilt the shee, went 5 years on a set of pistons and only lost 3psi on both cylinders.....Rebuilt a buddies bike who insisted on wiesco, did a compression test, both cylinders were the same, ran some heat cycles, broke it in, still the same.....Jumped on his shee one day and throttle stuck when he started it up, killed it immediately.....got the problem fixed, checked the compression for the hell of it....Lost 3psi in one cylinder.....That alone was enough proof for me. Besides that, how many events I have gone to, to watch people get on to a cold shee and take off wide open w/ no warm up...or 10 seconds of warm up.....

Moral of my story is......Cast pistons in a shee...wiescos suck. They are wayyy to tempermental for a shee...Forged pistons are lighter and that is why people go w/ them, but if you lose 3psi on one mistake, then everything you gain, you've lost....I've never had a shee blow up that I've put together w/ cast pistons, but I've never had a shee w/ forged pistons not blow up....I've owned 4 shees and I don't favor anything unless I see it for myself. I'm not saying cast are indestructable, I'm just saying I've had great success and performance over years of pure abuse.....Good luck

Someone please correct me if I am wrong, but I thought metal parts (pistons) shrink when heated up, and expand when they are cold.

[ohiobanshee]

Someone please correct me if I am wrong, but I thought metal parts (pistons) shrink when heated up, and expand when they are cold.

The opposit metal expands when heated,and contracts when cooled. :thumbsup:

[FireHead]

Duncan racing explained it to me years ago that the cast piston heats and expands at the same rate as the cylinders.

 

Moral of my story is......Cast pistons in a shee...wiescos suck. They are wayyy to tempermental for a shee...Forged pistons are lighter and that is why people go w/ them, but if you lose 3psi on one mistake, then everything you gain, you've lost....I've never had a shee blow up that I've put together w/ cast pistons, but I've never had a shee w/ forged pistons not blow up....I've owned 4 shees and I don't favor anything unless I see it for myself. I'm not saying cast are indestructable, I'm just saying I've had great success and performance over years of pure abuse.....Good luck

 

I'll buy the intp the statement regarding to the CTE of the cast piston and stock cylinder being close to the same. :thumbsup:

 

I would also respect Banchetta's experience. I don't agree, but Banchetta's experience is worth something around here. :thumbsup:

[FireHead]

Someone please correct me if I am wrong, but I thought metal parts (pistons) shrink when heated up, and expand when they are cold.

 

That's different.

[Banchetta]

to each his own i guess, i have had a pro x piston shatter in 1,000 pieces at 111 mph on an 11 second quarter mile pass. and another crack all the way through on my play bike.i never had a problem with wiseco on a high strung bike.

Just for curiosity, how much hp and torque are you running to grenade the cast pistons??? I've only been able to run them under 70hp. Since my 4mil takes the 795 pistons, I was forced to use the weisco, so I can't say for sure how much the cast pistons will hold up over 75hp....

[FireHead]

Just for curiosity, how much hp and torque are you running to grenade the cast pistons??? I've only been able to run them under 70hp. Since my 4mil takes the 795 pistons, I was forced to use the weisco, so I can't say for sure how much the cast pistons will hold up over 75hp....

 

Not to speak for anyone else, but I have lost cast pistons in many engines regardless of the horsepower level. Structural integrity of the piston really comes into question when you are talking about high rpm engines or engines with high cylinder pressures.

 

In regards to Pro-X, I will gladly say that for a Banshee, they are the best cast piston made. My only problem with Pro-X as a company is that their quality control is sub-par. I have had several of their pistons with the same part number measure up to 50 microns different from each other. I am by no means a high volume user of Pro-X pistons, so my experiences may have just been unfortuanted coincidences. :thumbsup:

[NYUK]

Just for curiosity, how much hp and torque are you running to grenade the cast pistons??? I've only been able to run them under 70hp. Since my 4mil takes the 795 pistons, I was forced to use the weisco, so I can't say for sure how much the cast pistons will hold up over 75hp....

 

 

play bike was around 75 hp. cracked completely through. the drag bike was close to 100 hp. on alky.

[NYUK]

THIS WAS AROUND 5 OR 6 YEARS AGO, I KINDA FIGURED OUT THE HARD WAY, SHAKING LIL ITTY BITTY PISTON PIECES OUT OF MY PIPE, CAST PISTONS AREN`T MEANT FOR HIGHER HP APPLICATIONS.

[ban-shred]

So, as you say, cast piston = better pistons for near stock engine, forged piston for modified engine...but as i seen far WISECO SUCK IN EVERY ENGINE I SAW...lol i'm not the type of guy to say something suck before i saw it many time so it isn't a coincidence...everytime i saw a guys with wiseco piston he blew up his engine.But PERHAPS its only wiseco, anyone try other forged piston that were great and without too much trouble?One of my friend had a suzuki lt-250(HEAVY ENGINE MODS) he was alway running on wiseco, every 4-5 month he blowed his engine, he tried pro-x pistons , he did 4 a tire smoke show(excuse my english i'm french i i don't know how to say it)flames were going of his pipes every times, his pipe was red near the exit every time, he jam his pistons into the cylinder because he was running straight pipe later(yes he's crazy) he disasemble the engine put some oil in it and de-jam it...believe me or not there was only a little scratch in the cylinder, this is a story of this summer, he's still running with his pro-x and he's fine and havent re-bore it, he haven't got a single engine trouble since.I think pistons preference really depends on the guys. For my parts when i'l blow my engine(wich is really near,i'm at 100 psi)i will put pro-x or namura into it.All my friend try them and they werent having trouble with them.