jackjohno Posted April 27, 2011 Posted April 27, 2011 I have just got my car back in pices after forging it my chlinders are standard 74mm i got scat con rods and 74 mm wisco pistons and the piston slap that i was getting was herendous can any 1 give me any advice because i cant afford another set of pistons and its lookin like i mite have to go back standard =( help needed plz ! Quote
Socks Posted April 27, 2011 Posted April 27, 2011 tolerances must be out.... did u have it honed? Quote
whiteglanzav Posted April 27, 2011 Posted April 27, 2011 u got a vid of it running pal ?forged engines can be pretty noisey and it may not be as bad as you think.make sure you have the right oil and let it get up to temperaature you should find that the noise dies down considerably Quote
yaristurbo Posted April 27, 2011 Posted April 27, 2011 They do slap cold pal, but need to make sure on the facts above dude Quote
glanza97 Posted April 27, 2011 Posted April 27, 2011 tolerances were 0.214 and 0.211, engine was warmed up, and drove for over 100 miles but still loud piston slap and using 10 40, no vid sorry Quote
StarletMad Posted April 27, 2011 Posted April 27, 2011 I have this too although its sounds like its coming from around the inlet mani / injectors etc :/ Quote
jackjohno Posted April 27, 2011 Author Posted April 27, 2011 Glanza 97 your a legend cheers for that dude anyone have any sugestions ?? Quote
starlet666 Posted April 28, 2011 Posted April 28, 2011 i would say something is a little out, i have wiseco (although custom C/R) and scat combo, and mine slaps a tiny bit for about 30 seconds to maybe a minute from dead cold start.... and mine was built fairly loosely to cope with 10 000rpm and 30+ psi Quote
rorenapier Posted April 28, 2011 Posted April 28, 2011 Whats your piston to wall clerance?Whats your ring gaps? Top and Bottom? Quote
jackjohno Posted April 28, 2011 Author Posted April 28, 2011 Whats your piston to wall clerance?Whats your ring gaps? Top and Bottom?tolerances were 0.214 and 0.211, what do u mean by ring gaps top and bottom? how do u want me measure them ? cheers Quote
jackjohno Posted April 28, 2011 Author Posted April 28, 2011 i would say something is a little out, i have wiseco (although custom C/R) and scat combo, and mine slaps a tiny bit for about 30 seconds to maybe a minute from dead cold start.... and mine was built fairly loosely to cope with 10 000rpm and 30+ psi Yea how was it when u first ever run it ? how long did you run it in for ? Quote
rorenapier Posted April 28, 2011 Posted April 28, 2011 Im presuming you never built the engine then?To measure the ring gaps you will need the pistons out and rings off the pistons.....http://www.wiseco.com/PDFs/Manuals/RingEndGap.pdfYour piston to wall clearance seems a bit big according to the Wiseco spec sheet aswell.They say a PTW of .004" but if turboing or heavy nitrous use add .001"Yours is at .008" (.003 plus...)Id go back to whoever built your engine and ask for clarification. Quote
starlet666 Posted April 29, 2011 Posted April 29, 2011 Yea how was it when u first ever run it ? how long did you run it in for ?the first start us was pretty much no noise, but i started it, gave it a few revs, set the boost at 20psi and took it for an absolute thrashing down the highway, 40 000km later not a single issue Quote
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