ash
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Pistons for a YB
Hi guys, Looking for a set of new pistons for a YB rebuild. Wossner price is great at the moment from http://wossneronline.com . They are also light(ish) compared to some of the others (Wiseco) and appear to have valve cutouts which is a bonus if I ever decide to put bigger cams in. Any opinions out there? I only want 300-350hp. Regards Ash
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Phil
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RE: Pistons for a YB
2011/02/10 19:01:50
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Cosworth Racing for sure[;^)] 
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ash
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RE: Pistons for a YB
2011/02/10 19:32:39
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I thought you might say that.
Have you installed them yet?
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LINCOLN
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RE: Pistons for a YB
2011/02/10 20:32:46
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Phil does have a sexy pistons but standard Mahle are fine - up to 500 hp - you will not need cutouts as a BD14 cam inlet cam is all you will need (a real 350 should be achieveable with 26-28 psi on a good turbo on standard cams, pistons and c.r.)
Seriously, save your money and use standard stuff - its strong enough and you will need the money on other stuff on car.
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LINCOLN
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RE: Pistons for a YB
2011/02/10 20:34:48
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If you must buy wossner make sure you get the clearances right - (which I have NFI about but plenty of people have a lot of piston slap on those pistons which will wear the bore).
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ash
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RE: Pistons for a YB
2011/02/10 20:35:39
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Lincoln,
Thanks for the advice, but the Wossner are actually less exy than the Mahles, so the real question is, are they okay?
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LINCOLN
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RE: Pistons for a YB
2011/02/10 20:40:31
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I will ask a few people who may actually know the clearances involved - most people dont. What does the manufacturer recommend for clearance?
BTW - how much are these pistons - I will try to dig out what I paid for Mahle 7.5:1 pistons a few years ago.
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ash
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RE: Pistons for a YB
2011/02/10 20:55:35
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$565 AU plus $85 postage.
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Phil
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RE: Pistons for a YB
2011/02/10 21:12:23
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The block has been torque plate honed now so very close[:p]
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ash
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RE: Pistons for a YB
2011/02/14 01:15:32
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Lincoln, recommended clearances are 0.1mm/0.004" according to the web site (Not like my noisy old skool pinto cossie pistons that were 0.006"!!)
Oh, and I've already spent heaps of money on the rest of the car [8~2] so no worries there.
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LINCOLN
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RE: Pistons for a YB
2011/02/17 10:08:38
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Confirmed friends have used 4 thou - some still have a few rattles when cold.
Where is car thread?
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ash
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RE: Pistons for a YB
2011/02/17 13:29:31
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ash
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RE: Pistons for a YB
2011/01/03 00:09:07
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Phil,
Starting to lean towards the genuine Cosworth pistons for the small amount of extra $$. I see that PEC also sell a cosworth slipper piston for their longer rods.
Any reason you didn't go down that path? Did you already have standard length rods you wanted to use?
Ash
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Phil
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RE: Pistons for a YB
2011/01/03 06:52:58
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Hi Ash,
I stayed with the Std length rods due to the stroke/rod ratio already being perfect for forced induction, I realised when I started to research this very issue prior to the build that Cosworth werent as silly as some would think[:o)] The reason the Cossie rods are slightly longer than pinto is that is all that is required to match the rod/stroke ratio perfectly for the application...hence not changing it. N/A is a different story but for a torquey YB turbo engine...leave them std spec[;^)]
Cheers,
Phil.
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Luke
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RE: Pistons for a YB
2011/01/03 11:06:01
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