MeBoosta Posted December 6, 2016 Share Posted December 6, 2016 Hi I'm about to buy a forged kit with 74.5mm Ross racing pistons and scat rods is anyone running them and are they good just said i would ask on here before I go spending 1350 on the kit. Quote Link to post Share on other sites
AdamB Posted December 6, 2016 Share Posted December 6, 2016 Yeah Ross are good. Will get a lot of slap with them though as they are 2618 alloy. Will take a lot of boost. Quote Link to post Share on other sites
Phil Posted December 6, 2016 Share Posted December 6, 2016 (edited) What alloy spec has the highest silicone content?Phil Edited December 6, 2016 by Phil Quote Link to post Share on other sites
tommyep82 Posted December 6, 2016 Share Posted December 6, 2016 I Have ross pistons and scat rods in my forged 4e running 1.4 bar hybrid td04 nearly 2 years with no problem, dont use speed vision hg tho, and people have even commented on how quite of a forged engine mine is, it sounds as good as standard Quote Link to post Share on other sites
wickedep Posted December 7, 2016 Share Posted December 7, 2016 awesome pistons. can take a lot of boost. been using them on my own car since 2007 and have customers who are using them too. they do not have much slap at all, most time you experience slap because machine shops machine the block without a torque plate. Quote Link to post Share on other sites
funny onion Posted December 7, 2016 Share Posted December 7, 2016 My EP70 engine has 74.5mm ross pistons on scat rods. don't get any slap with mine. obviously had to notch the block slightly for the scat rods. I boosted it within reason right from the first drive to help bed the rings in but I haven't pushed the boost up too high yet as I'm not chasing power with it at this stage. seems very capable though! and agree with above, I've always used genuine Toyota headgaskets on all my engines even after block decked and head skimmed and never had a problem. Quote Link to post Share on other sites
AdamB Posted December 7, 2016 Share Posted December 7, 2016 What alloy spec has the highest silicone content?Phil 4032 has higher silicone content Anywhere between 6% and 13% silicone usually. Not usually ideal for high boost applications because the gudgeon pin boss will flex and seize the piston in the cylinder. 2618 has below 3% silicone, flexes less, greater thermal expansion. Critical to get piston - bore clearances correct. Quote Link to post Share on other sites
gorganl2000 Posted December 15, 2016 Share Posted December 15, 2016 4032 has higher silicone content Anywhere between 6% and 13% silicone usually. Not usually ideal for high boost applications because the gudgeon pin boss will flex and seize the piston in the cylinder. 2618 has below 3% silicone, flexes less, greater thermal expansion. Critical to get piston - bore clearances correct. would you happen to know the silicone content in stock pistons?---if any? as i'm not clued in this area just asking for possible comparison sake Quote Link to post Share on other sites
AdamB Posted December 15, 2016 Share Posted December 15, 2016 would you happen to know the silicone content in stock pistons?---if any? as i'm not clued in this area just asking for possible comparison sake Quote Link to post Share on other sites
gorganl2000 Posted December 16, 2016 Share Posted December 16, 2016 Wouldn't know the exact content, but their hypereutectic cast, it's usually anywhere between 12% and 27% Silicon. thanks AdamB if i ever forge up, think i'll get some 4032 type pistons then Quote Link to post Share on other sites
AdamB Posted December 17, 2016 Share Posted December 17, 2016 thanks AdamB if i ever forge up, think i'll get some 4032 type pistons then I think Wossner are one of the only ones who do use 4032 Alloy. Possibly CP offer it as well. Quote Link to post Share on other sites
gorganl2000 Posted December 19, 2016 Share Posted December 19, 2016 I think Wossner are one of the only ones who do use 4032 Alloy. Possibly CP offer it as well. will pay a visit to their websites. good research for future reference Quote Link to post Share on other sites
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