Hypereutectic pistons and turbos? - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-19-2008, 01:33 PM
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Yeah, you're probably right that I'm more comfortable with breaking parts than some people.... I don't look forward to it, but I'm aware that it happens and I don't get emotionally attached to my engines. I figure that if I'm going to hurt the engine, it's more likely to be my mistake than a parts defect. I've seen precious few (like none) of those over the years.

Anyway, Like I said I'm trying not to break the bank for this project. I know that JE and Weisco both have specs for the Mercedes 16V on the books, but even starting with that, They'll probably have to modify from stock to accomodate the dept and size of valve pockets I need. The price has been the big stop sign for going that route... But from what I've seen, I can get the same quality part as a mass produced, off the shelf unit for an application with similar specs for much less money. Since I have a machinist in my back pocket, this will be a much less expensive solution if I can make it work....

Believe me, I'd be more comfortable with forged pistons. If anybody can point me towards a manufacturer with flat top forged pistons for a chevy 305, then I'll be happy to pursue them. I just haven't found them myself.

Oh, by the way, the OEM Mahle pistons for this engine were forged, but repair size pistons cost in the neighborhood of $400 each (mercedes pricing!) and they're HEAVY.

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  #17 (permalink)  
Old 02-19-2008, 01:43 PM
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you can give Ross your specs (pin height, diameter, ring size, ect) and they will make you custom pistons. Call them up and ask for price. I got a quote from them a few years back for a +0.070" stroked sbc with D-shaped dishes and they quoted around 700.00 for a set of 8. not too bad.
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Old 02-22-2013, 04:24 PM
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Hyper pistons and boost

Maybe I can help
Have been building Hi-Perf engines and drive trians since 1970
(Does that mean I'm old?) Well anyway, in answer to your concern about
Hyper pistons and boost applied, when I was a certified installation dealer with Turbonetics and Gale Banks some years ago, we built and installed a lot of different engine combos from mild to wild street, drag, marine and tractor pull engines, so I hope I will be of some help.
Most of the replys you received are pretty accurate in that ANY piston will give up if you miss treat it and YES, detonation is the destroyer of pistons, valves, rings and... well, you know what I mean. Very expensive repair. As to strength, cast is weakest, hypers are next then forged are the strongest
Many factors come together when you're considering forced induction over natural asperation. Too much to go into here but it's safe to say that with the right combo of parts on a decent engine (Doesn't matter what brand), with today's technology, you can safely run hypers way beyond 7 Lbs of boost with out destroying them. As a matter of fact, they will hold up quit well as long as some common sense is applied and you don't cross the line, so to speak. You want reliable 500 HP, then you need someone to help you build the engine who knows what the right parts are. ************************************************** ************************* Gary
Hope this helps
************************************************

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Old 02-23-2013, 08:45 AM
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Garye, I hate to say it, but that offer is about five years too late.

I ended up being able to source pistons from a Nissan 350Z which have the same diameter, and valve pocket dimensions, but a higher, smaller wristpin. Coupled with rebushed 5.7" rods, everything worked out perfectly. My second (machine to fit) choice, were forged pistons from a turbo volvo, which were heavier and involved more work, but would have been very acceptable.

I actually never got around to the final assembly. I just bombed around town with the car as it sat for a few years (stock drivetrain, modded suspension), until I got distracted by finishing my new garage (I've been puttering along on that project for too many years). I flipped the car and most of the spare parts a few weeks ago, but I kept most of the turbo components for possible retasking onto the transvair I just bought to replace it. Once I finish up with my garage (hopefully by mid spring) I'll start thinking about what to do with that.
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