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Topic Review (Newest First)
01-20-2017 04:44 PM
1turbofocus Ahhhh .... right

Yes I listen to my self and you running on about things you dont know about , I have had more then likely 10,000+ sets of Forged pistons go through my shop , I know hands down that the skirts of a piston can collapse

Probe easily could of said breaking , cracking but they chose collapse and yes I am sure they chose that word specifically for there advertisement because it is a known problem and they addressed that specific problem and why its in the advertisement

Email and company that makes Forged pistons or call and ask them if its possible for a Forged piston to collapse with over heating it

Just because you dont know or think its BS doesnt mean it doesnt happen

Tom
01-20-2017 03:23 AM
amc49 So all that just to show us a word?

You realize of course to Probe the specific word is not nearly so important to them as it is to you right now right? They could have used several other words there and been still correct. They could have said cracked or broken just as easily. I doubt rather seriously they sat around a table trying to figure out the exact word to use there (for you) over beers.

And now you even try to divorce the use of ''reinforced skirt' from 'collapse' yourself.

?????????????

'Not the reinforced skirt YES most Forged Piston Companies do that part BUT Probe specifically used the word collapse not break...'

For like the hundredth time I ask, do you EVER listen to yourself?

Uh, I should drop dead, right?
01-20-2017 12:05 AM
1turbofocus LOL I am not talking about the reinforced , Maybe you didnt read it

" Reinforced piston skirts to eliminate piston skirt collapse. "

Not the reinforced skirt yes most Forged Piston Companies do that part but Probe specifically used the word collapse not break and Probe is a very well known Forged piston company

If I searched there is talk all over the net from major piston companies about piston skirts collapsing , just because you think its BS doesnt change its a fact that it happens

Tom
01-19-2017 10:22 PM
amc49 And that is supposed to be proof of something?

ALL PISTONS MADE ON THE PLANET have reinforced skirts. Find me one that doesn't. All that means is that the piston won't suddenly fail by breaking the skirts out of it.

Good joke.
01-19-2017 09:36 AM
1turbofocus LOL , a Forged piston when over heated can/will draw in on the skirts ( collapse ) causing it to be slightly smaller to the point you get some piston slap

This is from Probe and I can find you dozens more like it , I did a copy and paste so it wasnt taken out of context

A: Probe FPS Forged Pistons are designed for heavy duty and high performance use when the application requires a piston that is stronger than a Cast or Hypereutectic Cast Piston. They are suitable for heavy duty, high performance street and some race applications. Compression ratios are similar to factory applications and weights are generally lighter than the TRW equivalent. The FPS series is manufactured using the same ultra-modern machining techniques as the SRS and series pistons.

FPS - Technical Summary

Forged of VMS-75 High Silicon Aluminum for lasting performance.
Light weight forging design is typically about 70 grams lighter than TRW’s.
CNC Diamond machined skirts and ring grooves for increase power.
Tight piston to wall clearance design for better ring seal.
Reinforced piston skirts to eliminate piston skirt collapse.
Radial Anti Detonation Grooves reduce detonation by clipping pressure spikes.
Pressure Equalization Channel enhances ring seal, making more power and increasing fuel economy.
Increased valve relief depth for high performance camshafts.
Offset wrist pins for reduced noise and lasting operation.
Stock size rings grooves and press fit piston pins.

Probe SRS Forged Pistons are designed for performance and race applications where a strong, lightweight forged piston is an advantage. With well over 200 part numbers now in stock for popular Chevrolet, Ford, Chrysler, and Sport Compact applications, the SRS Series are a full-featured piston and are extremely popular for use in street and most racing combinations.
01-19-2017 07:21 AM
amc49 Pistons collapsing-more conventional wisdom bullshit. Pistons don't collapse. They can wear of course and what they do like lightning when overheated, wear the crap out of the thrust faces as they try to stick in the bore. At that point they are trying to seize up, what 2 strokes commonly do.

Any piston going so far as to 'collapse' is borderline breaking up in pieces at any second. They don't just collapse to a point and then stop and even more so with a forging.

ALL pistons swell when hot, some are just tightly controlled, it depends on the aluminum alloy used and how much silicon in it. Straight aluminum swells at 3X the rate of an iron block, the piston structure is altered in design to control it as well as the silicon amount.

Numbers quoted there could have around .004" piston-to-wall which could possibly rattle a bit cold. A little is fine and can run forever.

I've run them at up to .008" and some rattle but the engines lasted forever. The key is matching the boresize to the aluminum alloy.

Single weight oil can run fine in those Brazilian temps, I run 30 and 40 (summer) straight here in stock engines in Texas. Can't kill 'em. It's not even synthetic.
01-15-2017 04:57 PM
1turbofocus Synthetic only

Tom
01-15-2017 11:20 AM
Fernando_221
Quote:
Originally Posted by 1turbofocus View Post
I use the mobile 50 in the summer and 40 in the winter , all synthetic

The piston slap isnt from the oil and thicker oil wont correct it , you either have over heated the pistons as some point and they have collapsed ( skirts ) or the bore was done to big and the piston is slightly loose when cold and the piston swells when hot and the noise goes away

Tom
The pistons are fine, I checked the skirts diameter before installing then, same measures as new, these pistons are a little smaller than the stock ones, it has 87.42mm and stock has 87.48mm, bore is 87.50mm.
Do you use 50 oil mineral or synthetic?

Thanks Tom
01-14-2017 06:28 PM
1turbofocus I use the mobile 50 in the summer and 40 in the winter , all synthetic

The piston slap isnt from the oil and thicker oil wont correct it , you either have over heated the pistons as some point and they have collapsed ( skirts ) or the bore was done to big and the piston is slightly loose when cold and the piston swells when hot and the noise goes away

Tom
01-14-2017 10:50 AM
Fernando_221
Quote:
Originally Posted by felixthecat View Post
Whats your clearances? stock pump? I for sure wouldn't go thicker......
Clearances are stock, stock pump. I have some piston slap when cold, when hot it's gone, no piston slap.
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