rob wild Posted October 5, 2006 Share Posted October 5, 2006 Hi Guys into the next stage of my performance upgrades and I’m doing the specification for my engine. As a base specification what do you think? Advice etc Wiseco 86.5mm/8.5:1 piston&ring kit, sides are teflon coated. Crower Connecting Rods HKS 1.6mm headgasket ARP headstuds ARP mainstuds New OEM Crank pulley Upper & Lower gasket set is Rod bearings Main bearings HKS cams HKS cam gears HKS timing belt Crower Valve Spring & retainer set OEM Valve seals, Valve locks, Spring seat locators OEM Crank seals Re-ground crank Cheers Rob Link to comment Share on other sites More sharing options...
SmigzyTT Posted October 5, 2006 Share Posted October 5, 2006 You dont mess about do you!! Link to comment Share on other sites More sharing options...
JamieP Posted October 5, 2006 Share Posted October 5, 2006 Id add a new oil and water pump to that list:) Link to comment Share on other sites More sharing options...
JustGav Posted October 5, 2006 Share Posted October 5, 2006 This by no means a recommendation more of a query... If you are going this far, is it worth considering putting in oversized exhaust valves? Link to comment Share on other sites More sharing options...
JamieP Posted October 5, 2006 Share Posted October 5, 2006 This by no means a recommendation more of a query... If you are going this far, is it worth considering putting in oversized exhaust valves? I asked this recently... seemed to be a big outlay for little gain:) Link to comment Share on other sites More sharing options...
JustGav Posted October 5, 2006 Share Posted October 5, 2006 I asked this recently... seemed to be a big outlay for little gain:) Ah okay, was just curious, I did it on an a-series morris minor 1098cc engine, used a mg metro turbo head which flows better anyway because of the larger valves. It certainly sounded better and had a lot more go (for a morris)... until it bent a push rod due to the valve assembly being twin sprung. Link to comment Share on other sites More sharing options...
Ian C Posted October 5, 2006 Share Posted October 5, 2006 I have a question Why the thick HKS gasket when you've got you compression ratio sorted by the piston choice? Also what's the benefit of the teflon coating? How long does it last? -Ian Link to comment Share on other sites More sharing options...
JustGav Posted October 5, 2006 Share Posted October 5, 2006 Also what's the benefit of the teflon coating? How long does it last? -Ian If it is anything like my frying pan, once through the dishwasher and it was damaged....whooops Link to comment Share on other sites More sharing options...
tDR Posted October 5, 2006 Share Posted October 5, 2006 Personally I'd get as near to stock sized pistons as possible (86mm) to preserve the integrity of the block. If your block isn't damaged it will likely just need honed to allow proper seal of the new rings, this way you can use 86mm. If the bores are imperfect and you need a rebore, I'd order some custom spec forged pistons from JE in 86.25mm size. You can get custom spec JE's in your own choice of compression ratio and my preference would be 8:1 to allow more boost on our road fuel without the need for more ignition retard. This way, you don't need a super thick fancy make MHG and can use a Toyota 1mm or 1.2mm (depending on whether the head is skimmed much) which is more than man enough for the job (they are also metal) and will preserve the squish area of the head. I'd also recommend new oil and water pumps during a rebuild, belts and tensioners too. Cheers, Brian. Link to comment Share on other sites More sharing options...
Ian C Posted October 5, 2006 Share Posted October 5, 2006 The compression ratio depends on your aims. I'd rather have 8.5:1 and less timing on silly boost, as that's much more streetable. Custom grind pistons sound expensive If the block is good you should just get the 86mm ones and a hone though, don't overbore for the sake of it, unless you simply must have that extra -Ian Link to comment Share on other sites More sharing options...
tDR Posted October 5, 2006 Share Posted October 5, 2006 RE: Custom JE's You can get them here for roughly £450 a set of 6 normal spec: http://www.racetep.com/JEnew.html Custom compression ratio doesn't add much iirc it was about an extra £150 for my brother's 3S-GTE pistons. There are loads of options as well when ordering a custom set, and they make them very quickly. Cheers, Brian. Link to comment Share on other sites More sharing options...
Ian C Posted October 5, 2006 Share Posted October 5, 2006 That's almost suspiciously cheap -Ian Link to comment Share on other sites More sharing options...
JamieP Posted October 5, 2006 Share Posted October 5, 2006 That's almost suspiciously cheap -Ian This seems a bit like that. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=260037333865&ssPageName=MERC_VI_RSCC_Pr4_PcY_BIN_Stores_IT&refitem=260037949138&itemcount=4&refwidgetloc=active_view_item&usedrule1=StoreCatToStoreCat&refwidgettype=cross_promot_widget Link to comment Share on other sites More sharing options...
tDR Posted October 5, 2006 Share Posted October 5, 2006 That's almost suspiciously cheap -Ian Have used Top End performance for JE custom spec forgies, Carillo rods and bearings without any problems - delivery was quick and prices excellent Link to comment Share on other sites More sharing options...
rob wild Posted October 5, 2006 Author Share Posted October 5, 2006 So the list stands now as: Wiseco 86.5mm/8.5:1 piston&ring kit, sides are teflon coated. Crower Connecting Rods HKS 1.6mm headgasket ARP headstuds ARP mainstuds New OEM Crank pulley Upper & Lower gasket set is Rod bearings Main bearings HKS cams HKS cam gears HKS timing belt Crower Valve Spring & retainer set OEM Valve seals, Valve locks, Spring seat locators OEM Crank seals Re-ground crank OEM oil OEM water pump I'm having my head reworked which will include skimming, porting and flowing so i was adviced to go for the thicker head gasket to keep the compression ratio down. This is not fixed in stone as the engine will need to be striped first then i can get the measurements for bearings and have a look at the bores. The teflon coat pistons are much better at handling heat and higher temps etc. Again this is something i've been advised on. Cheers for the advice Link to comment Share on other sites More sharing options...
Stu Storm Posted October 6, 2006 Share Posted October 6, 2006 Rob, I would go with the 5 stud cam gears if your wanting to run any big numbers mate! (Titan, etc!) I also use custom JE pistons in my skyline and they are very "slappy" when cold compared to the CP jobbies but never the less an excellent piston and very tough! Link to comment Share on other sites More sharing options...
tDR Posted October 6, 2006 Share Posted October 6, 2006 We've used JE customs in 2 builds, one had no piston slap noise and the other a bit when cold. It's all down to the piston to bore clearances you run and appropriate ring size / filing. Be very specific with whatever machine shop is bore'ing / honeing your block and run as small a clearance as you can get away with according to the piston spec sheet supplied if you want to minimise piston slap. Link to comment Share on other sites More sharing options...
Stu Storm Posted October 6, 2006 Share Posted October 6, 2006 Yep agreed a small about of slap when cold but spot on when warm! As far as the pistons go i have heard very good things about Weisco's! Also Ross are superb but everyone has their own opinion! HTH! Link to comment Share on other sites More sharing options...
rob wild Posted October 6, 2006 Author Share Posted October 6, 2006 So would you guys use Weisco over JE? or would you rate them about the same? At the end of the day at this point cost is not really a problem if its an extra few hundard pounds etc as i want the engine right! Cheers for the advice. Link to comment Share on other sites More sharing options...
tDR Posted October 6, 2006 Share Posted October 6, 2006 I would take JE over Wiseco. CP are also rated well but the ultimate has to be the JUN / Cosworth pistons. Cheers, Brian. Link to comment Share on other sites More sharing options...
rob wild Posted October 6, 2006 Author Share Posted October 6, 2006 I would take JE over Wiseco. CP are also rated well but the ultimate has to be the JUN / Cosworth pistons. Cheers, Brian. Thanks Brain just out of interest matey why? For example heat resistance, weight, material? Link to comment Share on other sites More sharing options...
tDR Posted October 8, 2006 Share Posted October 8, 2006 Better the devil you know so to speak really, but the reason for choosing custom JE's over the likes of Wiseco was based on material used and their reputation for durability. Link to comment Share on other sites More sharing options...
Stu Storm Posted October 9, 2006 Share Posted October 9, 2006 If money was not an issue i would choose CP pistons, then JE from what is available. Hhmm had cosworth pistons in my skyline and do not rate them at all, so changed them for JE pistons. I had the choice of pistons in my skyline drag engine and went for some tomei pistons as recommended by Ron at RK tuning. Link to comment Share on other sites More sharing options...
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