whizzer71 0 Posted August 3, 2008 Ive been told that these bottom ends can take upto 300 bhp happily but how much boost can the pistons handle before they give up,I understand obviously that there are many variables involved ign / fuelling charge cooling inlet temps etc ? Cheers Tris Share this post Link to post Share on other sites
fletch 0 Posted August 4, 2008 What pistons are you using? Share this post Link to post Share on other sites
whizzer71 0 Posted August 4, 2008 Std pistons hence my fear of melting them. Share this post Link to post Share on other sites
guffe 2 Posted August 4, 2008 I would be more concerned about detonation and resulting snapped/bent rods than melting pistons. Share this post Link to post Share on other sites
whizzer71 0 Posted August 4, 2008 Or any other damage come to that ? Share this post Link to post Share on other sites
sounds of silence 2 Posted August 4, 2008 am currently running 19psi on std internals mate in my track car on management tho Share this post Link to post Share on other sites
whizzer71 0 Posted August 4, 2008 am currently running 19psi on std internals mate in my track car on management tho Whats that - about 1.2 Bar ? Share this post Link to post Share on other sites
S13Nick 0 Posted August 4, 2008 its about 14-15 psi to a bar so about 1.5ish Share this post Link to post Share on other sites
sounds of silence 2 Posted August 4, 2008 around 1.4 bar but had a water issue with the engine now rebuilding it back up just now to run 1.5 bar still be on stock internals tho as its my test engines Share this post Link to post Share on other sites
whizzer71 0 Posted August 4, 2008 around 1.4 bar but had a water issue with the engine now rebuilding it back up just now to run 1.5 bar still be on stock internals tho as its my test engines What turbo / injectors & management are you using,I take it this is a stock 2.0ltr block and pistons crank etc,have you lowered the compression beyond standard ? Cheers Tris Share this post Link to post Share on other sites
sounds of silence 2 Posted August 4, 2008 What turbo / injectors & management are you using,I take it this is a stock 2.0ltr block and pistons crank etc,have you lowered the compression beyond standard ? Cheers Tris t28 hybrid cossy green 803 inj kms management catcam steel head gasket everything else around the engine is completely stock mate yes Share this post Link to post Share on other sites
whizzer71 0 Posted August 4, 2008 t28 hybrid cossy green 803 inj kms management catcam steel head gasket everything else around the engine is completely stock mate yes Dont spose you know how much its making do you ? Oh and where did you get your steel headgasket from,£ etc ? Share this post Link to post Share on other sites
sounds of silence 2 Posted August 4, 2008 Dont spose you know how much its making do you ? Oh and where did you get your steel headgasket from,£ etc ? sorry mate i dont its never seen a set of rollers yet always gets live mapped on the road . gasket is a toughy as it took me alot of time and effort to find Share this post Link to post Share on other sites
whizzer71 0 Posted August 4, 2008 sorry mate i dont its never seen a set of rollers yet always gets live mapped on the road . gasket is a toughy as it took me alot of time and effort to find Any chance you could PM me the details ???,Im always willing to share info. Cheers Tris Share this post Link to post Share on other sites
guffe 2 Posted August 5, 2008 gasket is a toughy as it took me alot of time and effort to find Cometic makes them http://www.cometic.com/sportcompact.aspx and they are sold all over europe too... Share this post Link to post Share on other sites
Spiky 37 Posted August 5, 2008 its about 14-15 psi to a bar so about 1.5ish 1.5bar is 21psi? i'd say thats a bit much, really depends on the mappy though Share this post Link to post Share on other sites
Spiky 37 Posted August 5, 2008 Cometic makes them http://www.cometic.com/sportcompact.aspx and they are sold all over europe too... i'd stick to std cometic need near on perfect surfaces to work ok, i had one fook up on my escort cossie, by by engine your choice though Share this post Link to post Share on other sites
guffe 2 Posted August 5, 2008 I didn't say they were good, I just stated that Cometic makes them I'd stick to std too, I have seen them on over 250 bhp alloy blocks without problems. I also will put standard gasket to my engine, hp goal is over 300... Share this post Link to post Share on other sites
sounds of silence 2 Posted August 5, 2008 I didn't say they were good, I just stated that Cometic makes them I'd stick to std too, I have seen them on over 250 bhp alloy blocks without problems. I also will put standard gasket to my engine, hp goal is over 300... sorry but the std head gaskets are ok yes for a std engine but for a tuned engine an uprated one is a must Share this post Link to post Share on other sites
Guest RonnyJ Posted August 5, 2008 We have used std headgasket on both our T16 engines without any problems. The 405 T16 with GT3076 @ 2bars+ and the 205 T16 with GT30 setup @ 1.8bars and we are using std gaset with out new setup, so I wouldnt underestimate it I would dare to say a fine tuned XU10 turbo bottom-end can take 400hp+, but how much boost you'll get 400hp comes down to head flow, exhaust manifold, backpressure etc... Share this post Link to post Share on other sites
Crazy-legs! 0 Posted August 6, 2008 If you are intending on using the stock pistons have you considered aquamist Tris? I know all the GT4 boys use it, as well as most pulsar drivers. On a GT4, the stock cast pistons are usually marginal at 1.1-1.2 bar. With aquamist ive seen them taken to 1.3+ with no problems! Cheers, Marc. Share this post Link to post Share on other sites
