Probe Piston Q...
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Probe Piston Q...

  1. #1
    Manwhore!!!!! Quick99's Avatar
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    Default Probe Piston Q...

    Have a question for the Gurus on here. Finally got all my parts together for my boat project. Parts going in a .030 454 forged bottom end. Pistons are Probe SRS series Flattops. [IMG]Edelbrock RPM heads. New B&m 420 with a chiller. Looking to run between 6 -8 psi. My question is what piston to cylinder wall clearance would you run with these pistons. Just a FUN lake boat. 25 Daytona. Pretty much a cruiser with the occasional white nuckle ride. Thanks for any input. Mike [/IMG]

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    Senior Member MACHINEHEAD1's Avatar
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    I have not run a Probe SRS in a blown app. However I have used them with very good results in NA. The SRS tend to run tighter than other 2618 forgings due to skirt design. Add .001 -.0015 for cold water pick up with no T-Stat. And .001-.0015 for low boost. Dyno it and get the tune spot on and safe.

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    Senior Member MACHINEHEAD1's Avatar
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    Check your pin fit. Probe pin bores have been really straight and consistant. However, for your app. I would take them out to .0008-.0009 in the piston. They are probably at about .0006-.0007 if you have not touched them. That would be a little snug for me. In the end, CALL PROBE!

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    Thanks for the input. Gonna call Probe Monday. Looks like the Machine shop is gonna love me lol

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    gn7
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    Quote Originally Posted by Quick99 View Post
    Thanks for the input. Gonna call Probe Monday. Looks like the Machine shop is gonna love me lol
    If they aren't doing it for free, what do they care. Its work isn't it?

    If you add the high side of what Machinehead posted, you'll end up with an additional .003 over the Probe recommened minimum of .0035. That puts somewhere around .0065 which is a pretty good number for a 2618 piston.

    BUT!!!! you REALLY need to pay close attention to what he said about the pin bores. Probe pistons DO NOT have forced pin oilers and they need a little extra clearance in a blown application.



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    Last edited by gn7; 11-24-2012 at 09:07 AM.

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    I'd go ahead and run them at their max for a blown marine app. I have a set in a customer's blown 489 that made [email protected] 6500 on 91 octane. X2 on the pins, and I set them at a full .001" clearance. Honestly, a pin upgrade wouldn't hurt.
    Don't expect the SRS piston to do something it wasn't designed to do. It is NOT a blower piston, and it is NOT a race piston. IMO it's about the bottom of the line, in-expensive, "performance" piston availabel.
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    Manwhore!!!!! Quick99's Avatar
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    Thanks. Funny Probe advertises the pistons as being able to handle HEAVY BOOST lol. Well I am only gonna run 6 to 8 psi max. Thanks for the input. Will definitely get the pin bores re sized. Pretty excited about getting the trailer Queen back in the water next season. Thank GOD for lots of OT LOL.

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    Senior Member MACHINEHEAD1's Avatar
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    Depending on the Probe you have, it takes a uncommon hone for the pin bores. I only bring this up because it sounds like your mach. shop may be hard to work with. BTW your 420 and 6psi will deliver 750-775 with a 250ish HYD. roller. I have done a lot of the 96-02 25s with 750HP. Will crack a 100 with proper x dim. I will own one some day. Best all around boat of all time IMO.

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    I have a question for ya. I am building a .030 454 with 8.00.1 compression. Edelbrock performer rpm square port heads with 2.19 intake and 1.88 exhaust. I am also running a B&M 420 roots blower with a superchiller water intercooler. This is for a marine application. Should be running about 8lbs boost. Also have 2 800cfm boost referenced blower carbs. My question is I have 2 hydraulic roller cams in your opinion which one do you think will have the best performance. My RPM range is about 1500 to 6k max rpm. Actual use is idle to about 3k to around 5k with the occasional 6k blast.
    Heres the cam specs for the Lunati Hyd Roller
    RPM RANGE 1800 – 6200
    Valve lift .575 intake and exhaust
    L/S 112
    in/opens 8D BTDC
    in/closes 44D ABDC
    ex/opens 57D BBDC
    ex/closes 5D ATDC
    IN DUR 232 .050
    EX DUR 242 .050
    13D OVERLAP
    Cam # 2
    CRANE ZHR-288-25-12 1 G
    RPM RANGE 1600-5600
    .587 INTAKE LIFT .610 EXHAUST
    LS – 112
    in/opens 6D BTDC
    IN/CLOSES 40D ABDC
    EX/OPENS 54D BBDC
    EX/CLOSES 0.0 ATDC
    226 .050 IN
    234 .050 EX
    6D OVERLAP
    Which one do you think would be more drivable I have to get the boat to idle pretty low so I can shift into gear I have a Bravo Drive. Also which one do you think will make the most usable H/P. Thanks for any input Mike
    Last edited by Quick99; 11-25-2012 at 10:40 AM.

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    Well just got off the phone with Probe pistons tech line. The guy that answered the phone had to ask someone else for the answer. The range on there instruction sheet calls for between .0035 to .0075 piston to cylinder wall clearance. Probe suggested .045 to .005. Also asked them about the pin clearance what they suggested and they said its fine leave it alone lol. Guess there not going to have THOUSANDS wrapped up in this so they really dont give a shit.

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