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104mm piston group buy??

Look at the weight of that 104mm CP. Disgusting. Those weights of 336g and 80g reflect my findings. I used a Wossner pin and reduced weight off the piston to get within 17g total.
 

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Thanks Alan for confirming weights.ill probably pull the trigger early in the new year,Aussie dollar is supposed to pull a bit back on usd.(unless this group buy gets of the ground of course)

If it jumps right up I'll get the weight down with ti wrist pin
 
bushmechanic said:
if the weight is more than about 340gm you will have a hard time selling them imho
Click to expand...

hey Bushie, btw, what's the calculation process which results in the 340gm number?

If I were to guess I'd say it were the point of weight after which it gets hard to balance the rotating assembly?
 
76model said:
Thanks Alan for confirming weights.ill probably pull the trigger early in the new year,Aussie dollar is supposed to pull a bit back on usd.(unless this group buy gets of the ground of course)

If it jumps right up I'll get the weight down with ti wrist pin ��
Click to expand...

Dick, re the TI pin, feedback that i was getting was that the DLC TI didnt have the longevity of the steel pins. That and price helped me decide on the Wossner @$30.50.
 
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I specified that cr would be around 13to1,rpm 10000, and that - wanted extra long life out of it. Ti pins wear faster so I will request still but light weight if possible. They should receive my samples soon and then will talk. Yesterday they didn't want to talk about the details.
 
tourist said:
hey Bushie, btw, what's the calculation process which results in the 340gm number?

If I were to guess I'd say it were the point of weight after which it gets hard to balance the rotating assembly?
Click to expand...

yes and its not necessary to have more aluminum than that, just makes everything more difficult
 
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thorgan said:
...And it appears that the 1190 uses a 105mm piston! And it may even use a 20mm wrist pin!
Click to expand...

thorgan, it certainly looks as if it uses a 20mm wrist pin, going by the part fiche

I’ll see if I can get hold of one and double check the particulars

Damo
 
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Engineers are now working on it. So I was told. Probably will need more than one week time.
 
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I have a question. Am I correct thinking that the 550 and 644 pistons sit 1mm lower than 628? 1mm below the deck? This gives lower compression ratio, right? So maybe 628 piston could be used in 644 with custom thicker gasket??
 
Andrzej,

we have received your samples, and have evaluated them. Unfortunately, we do not have the forging tools to manufacture these piston. At this time we will send these back to you, as there is unfortunately nothing we can do at this time.

best regards


Martin T

3550 Charter Park Dr.

San Jose, CA 95136

(408)448-2001

(408)448-3700 fax

www.supertechperformance.com
 
Wasn't meant to be?

That's bad news for us guys. Yet again I'll have to put on the shelf plans for big bore. I'll try to revisit the idea in a couple of years. Or join somebody alses attempt. ⛔️
 
polska said:
That's bad news for us guys. Yet again I'll have to put on the shelf plans for big bore. I'll try to revisit the idea in a couple of years. Or join somebody alses attempt. ⛔️
Click to expand...

I could be way off. Let me know.

If the 70* Bergs are close in specs, why not consider the CP 104 mm piston? Sure its weighty but you can get the weight down. Sorry if its been mentioned but my old brain forgets quickly. What is the weight of the OEM 650 piston?
 
canolman said:
275-ish? for the stock Elko
Gudgeon pin 70g I think.
Click to expand...

336g for the 104mm CP including an 80g pin!

Are CP using a lesser grade of aluminium? Its hard to comprehend why they would build such a heavy piston, then add a heavy pin. Mind boggling. Then Thumperracing add weight to the cranks to balance the assy. More mind boggling......or am i missing something?
 
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I've talked to him before when I was planning to have him do everything on my engine and he said he would talk to supplier or something like that, but for some reason I think it would be cp standard design and bit pricey. No latest tech for shure. Would be worth a call in any case. Just not what I was looking for. I wanted to build it for extra long life before another tear down.
 
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When I searched custom Pistons I had a few suppliers pop up. Will be calling around again.
 
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