Right pistons for my engine build?
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Right pistons for my engine build?

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    Senior Member jrider44's Avatar
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    Default Right pistons for my engine build?

    I am building a 496 blower motor, lunati pro series 4.25 crank, mark IV block already .060 over but scored. .070 should clean it up and need input on piston selection. These are pistons I was considering:
    Mahle BBC270320F03 Big Block Chevy Flat Top Piston PowerPak 498c.i.,4.320 Bore,4.250 Stroke,6.385 Rod,1.270R Compreesion Height,0.990 Pin,-3cc Vol. 502g,8.8 c/r, 4032 Aluminum
    Will these work for a blower motor? Are rings in right place? Any thing else I should consider?
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    gn7
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    Quote Originally Posted by jrider44 View Post
    I am building a 496 blower motor, lunati pro series 4.25 crank, mark IV block already .060 over but scored. .070 should clean it up and need input on piston selection. These are pistons I was considering:
    Mahle BBC270320F03 Big Block Chevy Flat Top Piston PowerPak 498c.i.,4.320 Bore,4.250 Stroke,6.385 Rod,1.270R Compreesion Height,0.990 Pin,-3cc Vol. 502g,8.8 c/r, 4032 Aluminum
    Will these work for a blower motor? Are rings in right place? Any thing else I should consider?
    Yes they will work. The rings aren't in the ideal area on the piston, but if you are running pump gas and don't get crazy with the timing and boost, and keep it out of detonation, they will work fine. I have run the same piston and beat on them pretty good and they didn't fail.
    Single biggest thing with them is that your machinist is familar with them. The skirt clearance is pretty critical on them. They don't want and don't need alot of clearance, and pay attention to your ring gaps. I like to hone the pin bore slightly for a blower deal.
    Its a good piston for the price.



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    Last edited by gn7; 02-21-2013 at 07:27 PM.

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by gn7 View Post
    Yes they will work. The rings aren't in the ideal area on the piston, but if you are running pump gas and don't get crazy with the timing and boost, and keep it out of detonation, they will work fine. I have run the same piston and beat on them pretty good and they didn't fail.
    Single biggest thing with them is that your machinist is familar with them. The skirt clearance is pretty critical on them. They don't want and don't need alot of clearance, and pay attention to your ring gaps. I like to hone the pin bore slightly for a blower deal.
    Its a good piston for the price.
    We build alot of them with Mahle pistons but like Bob said that skirt is short and not much there. 496 / and 540 normally aspirated. with pump gas. Never built a blower motor with them.

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    Senior Member jrider44's Avatar
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    Quote Originally Posted by gn7 View Post
    Yes they will work. The rings aren't in the ideal area on the piston, but if you are running pump gas and don't get crazy with the timing and boost, and keep it out of detonation, they will work fine. I have run the same piston and beat on them pretty good and they didn't fail.
    Single biggest thing with them is that your machinist is familar with them. The skirt clearance is pretty critical on them. They don't want and don't need alot of clearance, and pay attention to your ring gaps. I like to hone the pin bore slightly for a blower deal.
    Its a good piston for the price.
    If my machinist is not familiar with them, what are proper clearances for marine use? Are manufacturer reccommendations included with pistons and are they correct? What about the ring gaps?
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    steelcomp was here
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    Quote Originally Posted by jrider44 View Post
    If my machinist is not familiar with them, what are proper clearances for marine use? Are manufacturer reccommendations included with pistons and are they correct? What about the ring gaps?
    I would run that piston at 4.321-4.3215.
    You can call Mahle and talk to John Goodwin. He'll tell you everythig you need to know.
    Mahle MotorSports
    270 Rutledge Road
    Unit B, Fletcher, North Carolina 28732 USA
    Phone: 1 828/650-0809,
    [email protected]
    My bet is that piston is set to run at nominal for automotive apps, and for marine/blown I'd like to see another .001-.0015. I'd run the pin bore clearance at about .0009-.0010
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    gn7
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    Quote Originally Posted by jrider44 View Post
    If my machinist is not familiar with them, what are proper clearances for marine use? Are manufacturer reccommendations included with pistons and are they correct? What about the ring gaps?
    Quote Originally Posted by steelcomp View Post
    I would run that piston at 4.321-4.3215.
    You can call Mahle and talk to John Goodwin. He'll tell you everythig you need to know.
    Mahle MotorSports
    270 Rutledge Road
    Unit B, Fletcher, North Carolina 28732 USA
    Phone: 1 828/650-0809,
    [email protected]
    My bet is that piston is set to run at nominal for automotive apps, and for marine/blown I'd like to see another .001-.0015. I'd run the pin bore clearance at about .0009-.0010
    I want to say we ran ours at .005, which is about .0005 looser than their recommended max. I wouldn't go any looser. My main point when I mentioned your machinist is that with these pistons, close enough doesn't get it. A JE or CP 2618 piston is a little more forgiving to being a little TOO loose. Mahles require a little more attention to detail. Specially the 4032 pistons.
    We ran the top ring at .026 and the second at .028. It may be a little wider than you need but its safe. That top ring isn't very far from the top of the piston. Not a lot of piston material to take heat off the top ring.

    Because the pin is in the oil ring and pretty close to the top of the piston, it is important to add a little clearance to avoid sticking it in the piston pin bore. If the pin sticks in the piston, things get real ugly real fast.

    Like Steel said, you can call their tech and run the build by them.



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    Senior Member jimclauss's Avatar
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    there you go all the info you need, On another note what's the deed with JE and Wisco did they merge? I just had to wait 3 months for a set of JE 18 degree SB nothing real special pistons. I heard one bought the other any imput?
    Last edited by jimclauss; 02-22-2013 at 07:46 AM.

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    JE was purchased by Dover back in 2000 ± and at that time, they already owned Wiseco. They are both under the the portion of Dover called PMI. As time went on, many things changed there and just recently they have moved their entire manufacturing facility over to Ohio within the walls of the Wiseco facility. Their Engineering and Sales staff is segregated from their manufacturing plant and they still reside in HB (for now). They share resources and forgings, etc. all in Ohio now and the whole purpose was to save money/overhead I'm sure.

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    Senior Member jrider44's Avatar
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    This was exactly the kind of info I was looking for!! Thanks guys, very helpful!
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by Piston Maker View Post
    JE was purchased by Dover back in 2000 ± and at that time, they already owned Wiseco. They are both under the the portion of Dover called PMI. As time went on, many things changed there and just recently they have moved their entire manufacturing facility over to Ohio within the walls of the Wiseco facility. Their Engineering and Sales staff is segregated from their manufacturing plant and they still reside in HB (for now). They share resources and forgings, etc. all in Ohio now and the whole purpose was to save money/overhead I'm sure.
    I heard they were moving to Ohio, thats for the info that confirms it. Why don't they notify there dealers? I've been a Dealer for Wisco 20+ years
    Last edited by jimclauss; 02-22-2013 at 06:46 PM.

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    gn7
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    Quote Originally Posted by jimclauss View Post
    I heard they were moving to Ohio, thats for the info that confirms it. Why don't they notify there dealers? I've been a Dealer for Wisco 20+ years
    Probably because you were a Wiseco dealer and they weren't the ones that moved

    Its my opinion that the move will impact JEs custom sales on the western side of the country, specially the west coast, and Calif. The shelf stock end not so much because FOR NOW, they still maintain a warehouse in HB as well. But as PistonMaker alluded to, that could change at anytime. And no, you probably won't be notified about that either



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    Quote Originally Posted by gn7 View Post
    Probably because you were a Wiseco dealer and they weren't the ones that moved

    Its my opinion that the move will impact JEs custom sales on the western side of the country, specially the west coast, and Calif. The shelf stock end not so much because FOR NOW, they still maintain a warehouse in HB as well. But as PistonMaker alluded to, that could change at anytime. And no, you probably won't be notified about that either
    For now their intentions are to maintain an inventory on tthe west coast.
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    Quote Originally Posted by gn7 View Post
    Probably because you were a Wiseco dealer and they weren't the ones that moved

    Its my opinion that the move will impact JEs custom sales on the western side of the country, specially the west coast, and Calif. The shelf stock end not so much because FOR NOW, they still maintain a warehouse in HB as well. But as PistonMaker alluded to, that could change at anytime. And no, you probably won't be notified about that either
    Quote Originally Posted by steelcomp View Post
    For now their intentions are to maintain an inventory on tthe west coast.
    ALL KEY WORDS
    You've seen the "standard disclaimer"
    XXXX comapny reserves the rights to make changes without notice" blah blah blah.
    Their CURRENT intentions are to maintain a "shelf stock" inventory in so cal.

    I am a little surprised that the shelf stock doesn't include Wiseco pistons in the same warehouse.



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    Piston selection is very important.

    Call....

    1. ED @ CP pistons
    2. Brian Weaver @ JE Pistons
    3. Randy @ Race Tech Pistons

    all of them have 20 plus years of experience. And I would call all 3 before YOU make your choice.

    Nic

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