Top end performance customer story

[einstein57]

So if i was interested in purchasing these from OP to use with an eta crank and i rods, all i would have to do would be to deck the block and run a thin headgasket? Or would i have to run a s50 crank? BTW this would be for a turbo car running 18-20lbs of boost.

[Overlord475]

Your math is suspect, bro. 1.8 mm would be the pin height difference.

You're right... Should have been 3.6/2=1.8mm for half of the stroke rotation.

Good thing I wasn't ordering pistons. ;)

no bueno.

+1

[markseven]

Ive done things to spite customer's ignorance.

No bueno.

[b*saint]

If they are experts I'm sure they would've asked for all of the necessary dimensions, yeah?

Ive done things to spite customer's ignorance.

[LJ851]

They get it from the specified crank stroke and stock deck height... If the block was decked too much then that might be the issue.

The pin position will be 3.6mm higher for a 89.6mm stroke S52 crank than for a 86mm S50 crank. Or the crown will be thinner, not really sure where they make the adjustments, but it can be determined by stroke, connecting rod length, and deck height.

Whatever... ha

Your math is suspect, bro. 1.8 mm would be the pin height difference.

[chris_rai]

How can i be wrong ?

i'v ordered M20B25 stroker pistons !! 89.6mm stroke, 135mm rods. anybody who can make piston can easily calculate the wirst pin height and the compression height of the new piston.

Steve said : whe have done it several times, no problem...

a simple quote from e30 tech, not an isolated incident...

Bloody hell, thought that was my picture of exactly the same problem!



Obviously not an isolated incident! :(

Hope you can get it sorted dude :)

if someone think my block has been shaved too much


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[IxTech]

hahahaha this is some SHIT! drama drama drama. this sure was a great read; my entertainment for tonight folks.

but in all seriousness i hope this gets worked out. who ever the fuck was wrong needs to take responsibility and stop this. if chris is pissed cuz hes wrong he shouldnt bad mouth TE but if steve fucked it up, he has every reason to execute good customer service and make things right.

This is what women do and its childish

[Overlord475]

....How do they know the center of the wrist pin to the top of the piston height? How do they know how tall to make the piston?

They get it from the specified crank stroke and stock deck height... If the block was decked too much then that might be the issue.

The pin position will be 3.6mm higher for a 89.6mm stroke S52 crank than for a 86mm S50 crank. Or the crown will be thinner, not really sure where they make the adjustments, but it can be determined by stroke, connecting rod length, and deck height.

Whatever... ha

[Overlord475]

Worse comes to worse..... Use a thicker head gasket.

[markseven]

Yea as far as I know you can't just order bore diameter and specify rod length and they can make you a piston. How do they know the center of the wrist pin to the top of the piston height? How do they know how tall to make the piston?

If they are experts I'm sure they would've asked for all of the necessary dimensions, yeah?

[b*saint]

Yea as far as I know you can't just order bore diameter and specify rod length and they can make you a piston. How do they know the center of the wrist pin to the top of the piston height? How do they know how tall to make the piston?

[KirkerBezerker]

MMMMmmmmK. You can go away now.

[Jean]

And the plot thickens...

[Hey-U]

It sounds like there are 3 sets of mesurements required.
1. What was ordered
2. What was actually shipped
3. What is actually required to complete the project

We know where that the current set up doesn't work. What remains to be found out if the parts physically measure up to what was ordered.

[chris_rai]

Before you go and start calling people a liar and wrong you better make sure your 200% in the right.

Your missing specs also. What pin height did you order? What's the deck height on the block? Those two measurements are the most important when ordering custom pistons and determine the height of the piston in the bore.

I've known Steve Nelson for over 10 years and have bought thousands of dollars in parts from him and never had an issue.

I asked him did you need more measurement or specs and he responded i know exactly how to make these for you. The piston compression height looks good for a 86mm crank, not for the 89.6mm. Wrong copy/paste specs, everyone can make a mistake... No answer , no apologies, nothing ! Im not bullshitting, remember im 1200$ lighter now, for nothing. I m just saying : guys, beware of top end performance.