New cast pistons for 120cc heads

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Looks like we are going to make a cast piston for the big heads. It will be a true flat top and be .010 taller than the others availabe
Pricing areound $395 a set
How much interest?
Seems the flat top and taller piston would address current issues

Looking for some feedback
 

Nick Campagna

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That is cast, not hyper, correct ? With the big heads, will the piston have no valve reliefs cut, so most cams won't lose compression ? Pressed or float, What over sizes ? This could be very nice.
 

dave brode

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Nick,

Not trying to nit-pick, but "hypers" are cast too.

Question to all: Aluminum casting alloys can be hypereutectic, hypoeutectic, or eutectic?

Are non "hyper" pistons eutectic or hypoeutectic?

Dave

p.s. - Marty, made in USA :thumbup: I have speedpro 350 sbc pistons in my 4.3, made in freakin' India.
 

Ted in Olympia

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I think the cast flat tops are a very good idea but plus .015 would be better if you going to do it. This would make them about .005 out of the block and I think this would be perfect.

I know we had problems with the Hyper 76cc head pistons but I never heard of any with the flat tops and I thought they were a good product. How did they sit is a stock block?

Can you get forged pistons that are flattops? How much would they be worth?

I like this cast piston idea and I would use them for any 120cc rebuild.

Keep up the good work Marty.

One question for you; why do you not show the adjustable rockers on your web-site anymore?

TED
 

cadillac512

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Dave said: ''Question to all: Aluminum casting alloys can be hypereutectic, hypoeutectic, or eutectic?

Are non "hyper" pistons eutectic or hypoeutectic? "


Dave-

I believe nearly all (modern) non-hyper cast pistons are eutectic. There is a significant silicon content although below hyper levels.

Marty- Good idea! :thumbup:

Terry
 

Ted in Olympia

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You have a nice picture of them up top mounted on the head, and the non-adjustable ones on page 4, but I don't see the adjustable ones?

http://www.mtscadparts.net/servlet/the- ... Categories

I was thinking of selling mine but I wanted to look up the current price, also send the guy a link to what I had.

Maybe it's just operator error. Sorry to get off track.

TED
 

cadillackeeper

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I do have to say I am afraid every day of the week,listening for preignition.
I think the problems with the crazy KB's is first off that wild end gap filing
that is Crucial and going past a stock application.Gas is a killer too at the
supposed 10-1.Woosh,I paid $4.05 today for some to hold me till my usual
$3.75 place.
 

USSCADY

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What would the approximate CR ratio be with 120cc heads and near (.010-.020) std bore? Thanks! I think the cast are a great idea.
 
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ASSUming 120cc, 4.357 fire ring, 4.330 bore & .043 gasket thickness comp. is just under 9.0 I think 8.950 or so

Std bore would be about .010 less at 8.850 to 1 but we aren't making any stock bore pistons
 

USSCADY

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Thanks for the quick answer! I think you have a good idea with those. Not sure of exact numbers but there must be significantly more large chamber than small chamber heads out there.
 
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Well - we have commited to 30 sets of these pistons 15 sets at +30 10 sets at +40 & 5 sets at +60
These should set up about .004 in the hole with a stock deck and .004 out with a .008 deck cut
Made is USA $395 a set
Supposed to be ready by Sept 30 and was a pretty strong commitment to have them done by then :crossfingers:


Counting these we have over 100 sets of pistons in stock. Just trying to keep the service in the Cadillac world happy so they won't go back to a Chevy of Ford :puke:
 

Cadiac

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""Counting these we have over 100 sets of pistons in stock. Just trying to keep the service in the Cadillac world happy so they won't go back to a Chevy of Ford ""

I'd rather have Fred Flintstones car! :metal:
 
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