Jump to content
SAU Community

Recommended Posts

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.

Link to comment
https://www.sau.com.au/forums/topic/94541-venolia-pistons/#findComment-1709599
Share on other sites

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.

Link to comment
https://www.sau.com.au/forums/topic/94541-venolia-pistons/#findComment-1734701
Share on other sites

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.

Link to comment
https://www.sau.com.au/forums/topic/94541-venolia-pistons/#findComment-1735012
Share on other sites

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
Link to comment
https://www.sau.com.au/forums/topic/94541-venolia-pistons/#findComment-1735030
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • The speedo's can be very conservative, when my Mazda NC MX5 speedo is showing 118kph, the GPS, and a calibrated radar.... cop mate.....hits me at around 110kph +/- 1 or 2 kph, and that is on a 215/45 17, stock tyres size is 205/45 17 as well, so weirdly conservative with stock tyre size When my Commodore speedo red 116kph GPS had me at 110kph After doing some offset and clearance measurements to see what can fit the NC on 17x8 +40, without guard rolling or rubbing anything at my current ride height, I've decided that when my tyres are toast, I'm going to fit 225/45 17 and see where that gets me IRT actual speed of my speedo and GPS/radar From the online calculator I should be still be doing around 5kph under an actual 110kph when the speedo is showing 110kph My ADHD requires that when I'm doing 110kph on the speedo, that the actual road speed is actually really close to that, and not alot slower And going from 205 to 225 still keeps the car within the %/mm allowable in the NSW vehicle rules and regulations, which is nice, as long as I'm looking at the latest version that is.....LOL https://www.nsw.gov.au/sites/default/files/2021-02/RMS-13.464-Light-vehicle-modifications-Vehicle-Standards-Information-No-6-November-2013.pdf
    • Take the value it measured as, and pick the closest range available that is above the reading on the screen.   Also, no point just testing the coils. Read what has been said again. You need to test all your wiring, everything.
    • Does the scanner do all the CUs in the car, or only the ECU?
    • @666DAN sorry to bring you and old thread.     I've got my de+t done and it's all running great other than 1 small issue.    Car has remained auto with the na auto and tcm, I've used a stagea ecu with. NIstune board and everything is great other than my gear selection on the dash. It illuminates park, reverse, neutral, 3rd and 2nd when selected . But nothing when in  drive or what gear your in when you pop it into tiptronic. I'm sure there is maybe 1 wire in the ecu plug I need to move to rectify this. Do ya have any ideas?     Cheers man
    • Well I recently changed my rear axles and was thinking if I bumped anything, I have been driving the car for a while now though... But it has been raining today so everything is wet under the wheel arches. Brakes feel fine and can't hear any of the metal screamers, I had a squeak coming from one of the handbrake drums but that seems to have gone away a while ago. I was going down a hill when it lit up and I did feel the abs bite for a second and question why it did it?
×
×
  • Create New...