What's the low down on pistons?
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What's the low down on pistons?

  1. #1
    Or Seth, either one Budweiser's Avatar
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    Question What's the low down on pistons?

    I'm shopping for pistons and I'm wondering what brands offer a good balance of price AND quality. I'm currently leaning toward the Keith Black forged pistons due to the $465 price tag, with the equivalent JE pistons costing $695.

    The thing is, the JE's weigh in at 653 grams whereas the KB's are 582 grams. What's more desirable? Part of me says lighter is better, and the other part of me says that a heavier piston has more material and is therefore stronger and more durable. I'm not sure what to think.

    HELP!!!
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    TAB
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    might want to post some info about your motor/ what your trying to do with it.
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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by TAB View Post
    might want to post some info about your motor/ what your trying to do with it.
    Yes. This matters a lot.

    If you are wanting to build a 7,000 RPM motor, weight is very important. much less so at 5,500.

    Unless you are building a max-effort N/A or blower monster, I don't think you'll beat the value of the Speed-Pro Powerforged line.
    A genuine forged piston, good and solid, at a very friendly price. Ballpark $55 each.
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    Or Seth, either one Budweiser's Avatar
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    Default I had a feeling you'd ask for the application.

    I'm building a turbo'd 0.060 over 427 BBC. Aiming at 800-1000HP, between 6000 and 6500 rpm max.

    I looked at the PowerForged site but couldn't find the right ones. I need flat top 4.310" bore with 1.520" compression height with about -3cc intake valve relief to achieve the 8:1 cr I'm aiming for. Maybe I was looking in the wrong places, do you have a link to their piston for my application?
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    TAB
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    I would go with the best pistons you can get then...
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  8. #6
    !%@#$ Racer52's Avatar
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    turbo, 800-1000 ponies. Couple hundred bucks in your pocket cause you skimped on pistons will allow for the tow money to get you back on the trailer.

    dont skimp on part of the heart of the engine.

    Chrome wont get you home

    Just my 2 cents,

    Racer
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  9. #7
    Or Seth, either one Budweiser's Avatar
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    So.... Go with the thought that a heavier piston has more material and is therefor stronger and more durable???

    I'm all about doing it right the first time, I just don't want to spend unnecessary $$$. If the extra $ is for a cool name I'd rather not spend it. If it's going to be a more reliable part, by all means.
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    Senior Member Futs's Avatar
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    Buy once cry once. Get the best bang for the buck. You will thank yourself later.

    Just my pennys worth.
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    1000 HP turbo, I'd look elsewhere than the Speed-Pros. I don't think you need to go to the most expensive thing you can find either, but step up some and don't waste being cheap.
    Others with big HP experience will have their favorite brands, all are likely fine.

    Again, if you plan to cruise the boat as opposed to just short-blast race it, I'd consider slightly heavier pistons.

    Arias, Weisco, J&E, many good choices. I think you'll find a big disparity in price as well.

    Looking at a couple of catalogues, that compression height looks like you will be ordering a custom.
    Forget anything I said about a budget and add a decimal point.
    Weisco shelf items run 1.645 & 1.395 1.645 on all the flat-tops.

    J&E shelf piston:
    P/N .....CID..Bore..stroke..rod...deck..comp ht...110cc head..118cc head
    131666 439 4.310 3.766 6.385 9.780 1.520 ......... 8.3 .......... 7.9
    647 grams
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    What everybody else says,i know first hand.
    I collapsed a set of Diamond pistons.Hardly no skirts anyway.Should of known better.No more of them.
    Gonna go with some Wiseco's,they make a nice heavy piston for turbos.The skirts are way nicer and will handle the side load alot better.
    They are $1200.00, luckily i found it before something bad happened.Going with a longer rod also.
    Whoever you order from make sure they know you will be turbocharging it.
    Don't go cheap.Call the manufacturers and have them recommend a piston for you.Then make a decision
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  13. #11
    Senior Member Boat 405's Avatar
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    Give Chris Straub a call. He is very knowledgeable.
    http://www.straubtechnologies.com/
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    Gee..I don't want to go against the grain here....but I ran trw/speedpro pistons for many years from blown gas to blown alcohol and was always my preferred piston. I never hurt one. Only when I had a specific compression height that I couldn't get...then I ran SRP or Arias. The only "bad" is they are heavy...and the pins they come with are junk as far as blown use.


    For a 6500 rpm deal....I'd use a flat top trw/speedpro if available....throw the pins away and put in 180 grm taper wall...or the SRP with an optional heavy wall pin. Whatever I got the best deal on.
    Just my opinion.
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    Quote Originally Posted by Fiat48 View Post
    Gee..I don't want to go against the grain here....but I ran trw/speedpro pistons for many years from blown gas to blown alcohol and was always my preferred piston. I never hurt one. Only when I had a specific compression height that I couldn't get...then I ran SRP or Arias. The only "bad" is they are heavy...and the pins they come with are junk as far as blown use.


    For a 6500 rpm deal....I'd use a flat top trw/speedpro if available....throw the pins away and put in 180 grm taper wall...or the SRP with an optional heavy wall pin. Whatever I got the best deal on.
    Just my opinion.
    The big difference between the blower and a properly set up turbo deal is that the turbo will make monster torque down low and put a large load on the piston.

    Oh ya, and one more thing is a turbo will hold alot more heat on the top of the piston so the stronger the better,i got mine ceramic coated.
    Last edited by twntrbo; 01-04-2008 at 03:02 AM. Reason: oh ya
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    Ceramic coating would be a good idea IMO. $$$ well spent.
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