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Old 12-01-2009, 08:46 AM
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Wrist pin ...cannot decide!!!

Man...this is drivin' me nutZ...I got this nailed down to 2 choises!

I WON a set of Probe Industries forged pistons of MY CHOICE!
I'm lookin' at these ...and here they are...

http://www.probeindustries.com/ProductDetails.asp?ProductCode=10666&Show=TechSpec s

http://www.probeindustries.com/ProductDetails.asp?ProductCode=12347&Show=TechSpec s


About the only differences in the two are the wrist pin diameter ...which in turn...affects the ring lands!

Ring are 1/16---1/16---3mm and compression ratio is 10.37 with 58cc chambers.

Kool...I know...where my little brain in stuck between gears is...I jammed up
tryin' to figure out iF it is worth gettin' all worked about the difference in the pin sizes?

OK...please...no jokes about...well...never mind...

One uses a 0.912 pin & the other uses a 0.927 pin. Seems stupid...right?

Not when you...X8...figure reciprcating weights at 5500 rpms +...etc...

A gram here-n-there can add up for a "budget" build stroker project SBF...

This has been keepin' me awake at night for a while now...any ideas?...

-ThankZ...

-

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Old 12-01-2009, 08:56 AM
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Well, IIRC 0.912" is OEM SBF, 0.927 is SBC. Depending on the rods you choose to run, their could be a reason to use the bigger pins. Otherwise run the Ford spec pins, IMHO.

EDIT- Your links don't work, but I ran the following down from Probe's site:


Ford 331/347 Flat Top -4.0cc - SRS Piston Set
Part Number: 10666
1.175" Compression Height
3.250/3.400" Stroke
5.400/5.315" Rod Length
0.912" Pin OD
1/16 in. 1/16 in. 3.0 mm Rings
Available Bore Sizes: 4.000", 4.030", 4.040"

Ford 331/347 Flat Top -4.0cc - SRS Piston Set
Part Number: 12347
1.175" Compression Height
3.250/3.400" Stroke
5.400/5.315" Rod Length
0.927" Pin OD
1/16 in. 1/16 in. 3.0 mm Rings
Available Bore Sizes: 4.000", 4.030", 4.040"

Because neither set of pistons are designed for SBC length rods (5.7") is all the more reason to stay w/the SBF pin size. It's lighter, anyway.

Last edited by cobalt327; 12-01-2009 at 09:14 AM.
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Old 12-01-2009, 09:28 AM
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Ooopppps...

Yea...I left "some" info out...sorry...I was planning on goin' sort of conservative...sort of likin' this setup...

http://www.probeindustries.com/Produ...Show=TechSpecs

...cause I met a dude that has been runnin' a similar Eagle stroker kit
for 7 years and it still runs like a scalled dog..in a 3800lb. car daily driver
that see's the 1320 3-4 time every month!

NO offence meant to any K9's what-so-ever...
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Old 12-01-2009, 09:51 AM
How fast is fast enough?
 
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You're way over analyzing this for a street build. Run the pin that fits your rods. There a lot of much more important things to worry about.
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Old 12-02-2009, 08:33 AM
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I agree...

I came to that realization last nite...man...was I overthinkin' this thing or what?!

I DO want to say ThankZZ anyway...

I am goin' with new rods...Probe lightweight I-beam 5.400" ....

I figure...if I'm goin' this far...might as well make ol' Henry proud and stick with a Ford in a Ford...ya know...

Thanks again...
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