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#1
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How are those (mini)welded-crank strokers ?
Something like .125 to .200 or so. So you can get some decent compression by using a regular cast or forged flat-top piston without having to spend nearly 1000$ on on a set pistons.
Any "report-cards" please ! |
#2
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$1000 for pistons? You can get some Keith Blacks all the way up to 11.5 or so for about $200.
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#3
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LOL ...I would not use a set of those KB "hypers" ... in a Chebbie !
The 1000$ pistons are like Wiseco and Diamond. |
#4
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Thats cause you might not know what your doing.
I hear this from chevy guys all the time .. ''the ring lands broke, those KB's suk'' ''why did my rings butt'' I've run 4 sets in diff motors never had any of these problems cause I gap them correctly and leave adequate skirt clearance. FOLLOW DIRECTIONS. IF WE WERE SO SMART WE WOULD MANUFACTURE & SELL OUR OWN PISTONS. |
#5
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ME not know what I am doing ? ....you AIN'T gonna' get in-my-head with this BS of yours !
You don't KNOW ME. You don't know what I have done or used. I have never used a set of these pistons ...and never would. Not UNless they stop making forged or cast OR custom forged pistons. I DO KNOW of several different people that have used these pistons and have had MAJOR issues with them. You and your FOUR MOTORS ? ....wow - I know people who build that many motors in a MONTH ...for other people ... that would not use those pistons -- if they were given to them. Your reponse ? ...wasveryfunny ....GET serious. |
#6
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I used a 3.38 (+.070") stroker crank in a .030" over 318 and got 9.8:1 compression with flat top pistons and 55cc W2 heads. I do not remember the specifications, but the pistons were still below the deck enough for me to use .028" head gaskets.
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#7
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Quote:
Anyway, what's wrong with hypereutectic pistons? If you're motor's going to be super-heavy-duty they might be too brittle, but they seem like the norm nowadays for hot N/A street builds. A guy I'm about to get a 360 block from uses KB Silv-O-Lite's all the time in his street drivers. |
#8
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Hey kid .... after being "attacked" by this guy .... and reading THIS on his published profile ...
Biography: When I flew in from space I noticed there's a lot of idiot's on this rock. Location (required): your head Vehicle & modifications (required): space ship Occupation (required): farting,pissing in your face. Thanks for visiting, suck it ez .........he truly "deserved" more than I actually gave-him !! Those hyper pistons ? .. you labeled them brittle .... and that is what I hear too. These pistons sometimes FALL APART ...when they are subjected to any type of detonation. KNOWING this why would anyone use them? .... is it worth the 200-700$ savings to literally destroy a complete engine over using these clearly inferior parts ? I do not want to spend an extra 700$ or so ... if something cheaper will work, be equal to and LIVE. But if these parts fail ... the whole engine is a waste-land. |
#9
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Yes, the welded stroker cranks work. You can also shop around for different rods with smaller journal sizes on offset gride the crank to get bigger cubes.
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#10
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Ss .... I am new up in this area and I was thinking about this during the winter. I approached a shop(they have abbout 5 stores around MI) ..and they said that it was no problem ..and it is pretty reasonable - 185$.
A 4" stroker crank would be perfect in alot of cases with these OEM standard low-compression pistons. |
#11
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I have run KB flatties in my 360 for 150K. Lots of pinging! I used to have a intake leak for many miles. Lots of low octane fuel (oil) got used up.
It used to ping on a couple of long grades on I-40 burning 93 octane. Fixed the leak after many 100K and tops looked fine! I did some Mopar combustion cleaner in it before the head swap. I run 87 now with the leak fixed and only pings when I really stomp it. |
#12
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LOL!!!!
oh the joy I just received from your posting of my profile.... Yea, I think profiles are for g** ass dating web sites, but it was necessary. Hope U enjoyed as much as I did your viewing it. Hyper piston's are really the best bang for yer buck when building performance from mild to wild or even race/claimer ect engines. They're pretty light, don't grow as much/quieter can handle a decent amount of nitrous and cost lil more than stock replacements in a lot of cases. |
#13
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Quote:
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#14
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Quote:
You want to use Hyper pistons ? ... I will use stock cast replacements. |
#15
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With the exception of a few high perfromance engines like the 6.1 hemi, LS6 and LS7 virtually every motor delivered in in new cars these days have cast hypereutetic pistons.
They are superior in every way to a non hypereutetic cast piston. They ultimately may not be a strong as a forged piston but for a N/A street performance motor they are a great choice. |
#16
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All OEM motors ? ...I was not aware of that. But if they are so great .... why then do the 3 motors you mention NOT use them ? And what type pistons do these motors use? .... a plain cast or forged ...or even custom forged?
Just curious ... how many motors from the USA OEM in the past say 30 years ... have used a forged piston? |
#17
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That is a great question. I bet the Hyper pistons are better in controlling expansion and keeping the motor quiet for all the daily drivers out there. There is a debate over in an STi forum about their pistons being forged or hypers, looks like some Jap spec motors had OEM forged slugs, and maybe a few Euro performance makers too. I dont think US drivers are ready for loud forgings. Vette, Acura and someone else runs very high compressions on pump gas, wonder what they are running?
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#18
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A hi ratio ...in a stock motor ?
Anyone care to guess what make and model OEM(not hi performance) vehicle used a CR well over 11 to 1(11.6 I believe) ...and the vehicle being able to use 86 octane pump-regular ? |
#19
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Quote:
The high silicon content of a hyper eutectic alloy makes them harder so they wear less, it makes them thermally more stable so they can be set up with tighter tolerances which also helps with wear and makes the engine quieter. The strength to weight is better than a forged piston. They are a better choice in every way than a non hyper eutectic alloy cast piston. They are also much less costly than a quality forged piston only slightly more expensive than plain cast. These days the only plain cast pistons available are low compression rebuilder pistons. On the down side the silicon makes the alloy more brittle so when they do fail they will break where a non hyper alloy cast or forged will distort. They are ultimately not as strong as a good forged piston, a cheap forged likely has little or no strength advantage. A hyper eutectic piston is an excellent choice when used in the correct application, certainly you could use a forged piston in that application but other than bragging rights it won't buy you anything but a lighter pocket book and a nosier engine. |
#20
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dgc ...I was unaware of all this. It sounds reasonable.
What are the proper piston-to-wall ...and ring end gap specs ? |
#21
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An interesting post on another forum:
Quote:
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#22
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027 to what max ? ... and is the ring placement HIGHER on the hyper pistons than on the OEM cast or forged ?
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#23
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Hypereutectic pistons are great for street or street/strip engines. Their expansion rate is less than conventional cast pistons, so they can be run fairly tight in the bore=better ring seal & oil control. A good quality cast piston can work as well, but when you start running high c.r.'s & using nitrous, blowers or superchargers, thats where they fall short in the durability department. Most of the hypereutectic pistons are also lighter than regular cast pistons, so this is also good for performance. Most of the problems associated with cast pistons has been due to errors on the part of the person installing them incorrectly. This is how bad rumors get started about good products. A good forged piston is obviously the strongest & lightest, but usually they require a looser fit=more noise & oil consumption. Forged pistons are also the most expensive, and only a serious build requires them. Just my 2 cents on the subject.
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#24
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I would never use a hypereutectic piston but I would also never use a welded crank. You want quality pay for it but busting someone's balls because they are suggesting parts that are completely in line for the kind of build you are contemplating will only lead you to not getting any future advice. -Bob
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#25
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Quote:
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#26
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"ME not know what I am doing ? ....you AIN'T gonna' get in-my-head with this BS of yours ! " Not the kind of response I would likely be fond of hearing. Remember he said you may not know what you are doing not that you don't. He and many others have had great luck with this type of piston so he was probably just offering a suggestion as to why you may have not had a good experience. There are steps that must be followed to insure a good service from these pistons. I consider them low budget pieces only but I feel the exact same about welded cranks. -Bob |
#27
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If you POST a quote like that post the WHOLE post.
This guy "attacks" me without any type of provocation at all. Just LOOK at this guys profile .... that his "occupation" is "farting and pissing in your face" ... You might approve of that ..IN your face ... but most people do not. |
#28
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Alright....Lets get back on topic.... Cause I'm a dumb azz and need to learn something...
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#29
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Yeah R H ...how is YOUR welded crank ?
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#30
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Have not had one brake yet...
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