Probe Industries Forged Pistons - INSTALLATION DETAILS
- Thread starter Doward
- Start date
Thanks for the clarification, I contacted Probe themselves and got the same answer, not sure where all this talk about clearance per side started but i now know how it is measured.
thank you for explanation guys, anyhow I've already assembled that motor using probes (with _big_ troubles) and melted one piston (yeah, detonation source was at sharp edges it valve pockets)... So no more probes for me. Time to go .060 wisecos... =(
Mr. Y;1434670 said:
Sorry to hear that Mr. Y.
I call the probe piston an "un-finished" piston. The tops need to be profiled and de-burred. I an emery cloth wheel in a die grinder to remove the sharp edge, then I bead blast the top of the pistons.
Here is a pic of so probes I installed in a motor. You can see the sharp edges are gone as well as all the tooling swirl marks left behind by probe.
I have some +.060 wiseco pistons in stock if you need some. Just give me a pm.
Thanks for the comment, Rich. I haven't decided with new engine yet most likely it will be low-compression slug with some custom pistons (or may be vice versa). Anyhow I'll be asking SM opinion including such reputable guys like you..
And now is time for getting some funds for new setup
And now is time for getting some funds for new setup
and one note to all: I don't call probes bad pistons. I just haven't luck with them (wrong machining, etc)... And as for melting - I was running at the edge (22 psi on pump, 27 psi on pump+WI) + one night fuel line blowed and I was running lean (at least one 1/4 mile pass). So I don't blame probes... just bad luck =(
I am aiming for under 400HP, do you still think it is necessary to round off the edges and such on these pistons or is this only for high horsepower applications?
4U2QUIK
1UZFE SWAP DUDE!!!
suprarich;1434164 said:
ansi standard would be ±.005 for 3 place decimals and ±0.0005 would be for the 4 place decimal.
4U2QUIK;1435972 said:
So your saying that a measurement of .005 would be subject to a +/- of .005.
That would give your measurment a "possible" range of zero to .010?
Did you intend to say a 3 decimal is accurate to +/- a half at the 4th decimal? and a 4 decimal is accurate to a half at the 5th decimal?
suprarich;1437517 said:
This is generally true....three place decimals in blue prints usually have a +/- .005" tolerance....although it all depends on who wrote the print and the shop practice...
Usually it goes like this:
angles +/- 0.5
.xxx +/- 0.005
.xx +/- 0.01
.x +/- 0.03
dimensions & tolerance are in
accordance with ANSI/ASME Y14.5M-1994
unless otherwise specified.
Good thing I don't go by those tolerances then because engines would be blowing up left and right. I go +/- a half, one decimal past the decimal I am trying to be accurate to.
When I want something to measure .0041, I want to be accurate to .00405 to .00414.
Using the std you guys are posting would make .0041 accurate to .0036 to .0046, that is just beyond un-acceptable tolerances.
When I want something to measure .0041, I want to be accurate to .00405 to .00414.
Using the std you guys are posting would make .0041 accurate to .0036 to .0046, that is just beyond un-acceptable tolerances.
4U2QUIK
1UZFE SWAP DUDE!!!
ANSI/ASME Y14.5M-1994
lol, he beat me to it. but anyway it's the standard you will most commonly find in use.
Lawrence livermoor labs uses it, so san dia labs, and berkely space sciences labs ect ect....
btw... I do a lot of inspection work for these guys.
just keep this in mind when dealing with high end non-automotive machine shops and engineering firms.
lol, he beat me to it. but anyway it's the standard you will most commonly find in use.
Lawrence livermoor labs uses it, so san dia labs, and berkely space sciences labs ect ect....
btw... I do a lot of inspection work for these guys.
just keep this in mind when dealing with high end non-automotive machine shops and engineering firms.
hope you're measuring that in a temp. controlled room....suprarich;1437671 said:
Man this is an old thread.
So I'm getting ready to finally install these but am having an issue. My turbo block has small cracks from the coolant port to the bolt hole. I have another block block that turned out not to have piston oil coolers (squirters) Have any of you run these probes without squirters? I understand the piston pins do not have forced oiling, this sounds like it will be a problem.
Edit: I think I'm going to just have the non-turbo block machined for the squirters
So I'm getting ready to finally install these but am having an issue. My turbo block has small cracks from the coolant port to the bolt hole. I have another block block that turned out not to have piston oil coolers (squirters) Have any of you run these probes without squirters? I understand the piston pins do not have forced oiling, this sounds like it will be a problem.
Edit: I think I'm going to just have the non-turbo block machined for the squirters
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