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Venolia Pistons

N I B

By N I B,
in Engines & Forced Induction

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N I B Grand Master

N I B

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Not nice.I just pulled a motor down that had something from the intake go thru a cylinder and when i pulled out the piston it had a crack from the oil squirter cutout up the skirt so i pulled the others out and everyone was the same.The motor is only a low miler and never had a max hp tune and was running modest boost.

Im not blaming the piston yet as i want to give the dealer a chance to find out whats happened but the bore clearances are to their spec.

I have been told that the pistons come to Australia with out the oil squirter cutout and that its added here and looking at it this looks the case as the cutout has a very different finish to the rest of the machining on the piston,The cut has been done with a coarse grade stone etc with the cut going from the outside of the skirt to the inside and the cracks all started in these deep scratches so if anyone is building a motor with these pistons and they are cut the same i would recommend you get out the die grinder and polish this area or wait till i get an answer from the distributor on what has happened but as this guy go this piston and rod package thru an Internet shop it may slow the prosess a bit.

This may be a one of as Venolia make the pistons in Australias fastest Top fueler.

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NutR33 Community Regular

NutR33

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I have had the same problem with my venolia pistons

Im using a rb26 crank and rods in a rb25 block with venloia pistons and N1 rings running 22psi. the motor had less than 10k and 12 months on it and distyroyed no4 pistons for other reasons. When i stripped the motor i found cracks on all 6 pistons in the same spot leading up from the oil squiter area.

The pistons were installed with a clearance of .005 as per recomeded ( specs from venolia are .006 to .01 i believe - can someone correct me on this) and knocked the bores around a bit to a clearance of .0065 when removed.

Currently the pistons are at a piston maker in melbourne for their expert veiws, and a quote on a set of custom units to be made.

I will post up any further news when it comes to hand.

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Blitz Grand Master

Blitz

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They are terrible pistons, you only have to look at one and examine its design to understand.

From memory the skirts are VERY thin, compared to other aftermarket pistons like Arias, CP or ACL

I personally have heard nothing but terrible reports about them, and know of a handful of freshly build RB26's that had to be pulled down and have pistons replaced due to the majority of the new Venolia pistons cracking around the skirt.

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Cubes Grand Master

Cubes

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Posted (edited)
I have run them for 350km on 200kw before they spat the gugeon pin out the side, steer clear, they are junk. Go CP or Arias.

Since your experience I have come across two other engine builders who say they won't touch Venolia for that very reason.

Its a bugger how you always 'hear' about these things after something goes wrong.

Don't forget Wiesco, I've had them in mine for 25,000km's. No oil usage. :)

Edited by Cubes
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