Silverline Posted June 6, 2012 Share Posted June 6, 2012 Just another Quick Q again .. ARP Studs ... what Torq set for main/lower ? same at stock or tighter its should give you the exact settings in the instuctions for that specific bolt mark depending on which spec it is for example a normal 10mm 1.25 arp is 80lbs ft Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 6, 2012 Author Share Posted June 6, 2012 ok ... the lot should be here tomorrow/fri ... was just pre thinking Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 8, 2012 Author Share Posted June 8, 2012 Piston Gapping Just reading the tech info on the rings ... 87.5mm Bore = 3.444" i have to multiply this by top ring application size .0050 ( turbo/nos ) this comes out at 0.017" ( 0.43mm ) to me this sounds a little small ? Quote Link to comment Share on other sites More sharing options...
vodkashots Posted June 8, 2012 Share Posted June 8, 2012 im not sure but i think mark likes red. Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 8, 2012 Author Share Posted June 8, 2012 now how u come up with that ? Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 10, 2012 Author Share Posted June 10, 2012 (edited) Engine build so far Wiseco Pistons 87.5 Eagle Con Rods ARP Stud Bolts ARP Main Bolts ACL Main Bearings ACL Rod Bearings GT2560'r Tubs AMS Manifolds 740cc Injectors JD Tuning Uprated VTC Springs Gates Racing timing belt Comtec Head gaskets New Oil Pump NA oil jets New Timing Sprocket OEM Gaskets set PCV Valves Heads Ported/Polished Valves Re-cut/Seated Block Bored out Unortherdox Pulley set Lightened flywheel 6 Paddle Clutch Dual 10" Fan conversion 2nd Piston Ring gap Spot on 1st piston ring needed Gapping all 6 pistons needed doing Edited June 10, 2012 by MarkDerby Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 10, 2012 Author Share Posted June 10, 2012 (edited) A bit of Porting of the heads to match the manifolds bigger holes Original are 29mm high x 34mm wide .. now 35mmx38mm just a note that the holes look a little rough ... they have been smoothend off Edited June 10, 2012 by MarkDerby Quote Link to comment Share on other sites More sharing options...
phutumsch Posted June 10, 2012 Share Posted June 10, 2012 Fabulous pics and work Mark :clap: Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 10, 2012 Author Share Posted June 10, 2012 (edited) More Porting quite a bit of ally to take off to the edge of black marker All Most Built Edited June 10, 2012 by MarkDerby Quote Link to comment Share on other sites More sharing options...
pumagt Posted June 11, 2012 Share Posted June 11, 2012 Hi Mark, not sure if I have missed this in your thread, if you are using COMETIC mls head gaskets remember to have the head face and block deck machined to 50RA as specified by cometic. This is almost a mirror finish and is important otherwise you will get coolant leaks. I am building my forged motor with the same grocery list as you but will probably not use the cometics I have already bought and rather go for OEM HG as I am targeting max 450 BHP. Cheers Quote Link to comment Share on other sites More sharing options...
Guest BigC Posted June 11, 2012 Share Posted June 11, 2012 Very impressive Mark, looks great Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 11, 2012 Author Share Posted June 11, 2012 Hi Mark, not sure if I have missed this in your thread, if you are using COMETIC mls head gaskets remember to have the head face and block deck machined to 50RA as specified by cometic. This is almost a mirror finish and is important otherwise you will get coolant leaks. I am building my forged motor with the same grocery list as you but will probably not use the cometics I have already bought and rather go for OEM HG as I am targeting max 450 BHP. Cheers the Main block was checked me and the machine shop .. and all was level and clean so there was no need for decking ... but the heads did get skimmed and this all ready had to go to the next thickest gasket if i had the block decked just for the sake of it means i would all so have to get the 3rd thickest gasket and this then starts to rely more on that to have the compression at the correct ratio Quote Link to comment Share on other sites More sharing options...
Eggs Posted June 11, 2012 Share Posted June 11, 2012 How did you work out which thickness gasket you needed Mark? Hypothetical question: you had an engine and had no idea if the heads/block had anything off before your ownership, how would you go about finding the correct thickness gasket to get the right compression ratio? Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 11, 2012 Author Share Posted June 11, 2012 ok theres a few ways to determine the correct compression on the engine but 2 of them involve tools that are quite expensive so the easy way is knowing that your block is stock ......... then when you have any work done to it Machine shop should/will tell you how much has been taken off Heads/Block the manufactures have Set gaskets at different thickness's lets say 1mm is stock ... then it will go by 1.2 1.4 1.6 so on so no machined heads u will use Stock gasket ... if the machine shop as taken 0.1mm from head u have to use 1.2mm gasket problem u all so get is u are decreasing the compression ratio a little ... so the best is to get a Close'st match as Poss if your Heads/engine is unknown then u have to have the Volume/compression ratio tested Machine shop will have those spacial tools to work that out Quote Link to comment Share on other sites More sharing options...
Eggs Posted June 11, 2012 Share Posted June 11, 2012 Thanks, i've wondered that for years but never asked Quote Link to comment Share on other sites More sharing options...
Silverline Posted June 11, 2012 Share Posted June 11, 2012 Piston Gapping Just reading the tech info on the rings ... 87.5mm Bore = 3.444" i have to multiply this by top ring application size .0050 ( turbo/nos ) this comes out at 0.017" ( 0.43mm ) to me this sounds a little small ? no thats spot on Mark Quote Link to comment Share on other sites More sharing options...
pumagt Posted June 11, 2012 Share Posted June 11, 2012 Hi Mark, what I was trying to say is that the finish for composite head gaskets and Cometic steel head gaskets are not the same, I am not on about the trueness/flatness of the surface....50ra for mls gaskets is much smoother (almost mirror finish ) as apposed to normal head skim finish which you can see the machine marks. This is well known on the australian 300zx forums. Sorry for going on like a stuck record...I will shut the @#$% up now. Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 11, 2012 Author Share Posted June 11, 2012 lol who said u was going on .... its nice to have other ppl's input on things like this Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 12, 2012 Author Share Posted June 12, 2012 All Built and ready to fit tomorrow Quote Link to comment Share on other sites More sharing options...
Eggs Posted June 12, 2012 Share Posted June 12, 2012 Jesus Effin Christ you made short work of that didn't you? Now were you careful with the liquid gasket so none can get into the oil or water ways and cause you more grief?:biggrin: Nice work mate :thumbup1: Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 13, 2012 Author Share Posted June 13, 2012 Well its Running as from 10pm it started on the first fire ... ( after priming for few mins ) .. Spent the morning with vody and his gear box didnt start getting my engine in till 4pm just need to sort Rad & Fans out Prop shaft Exhaust bonnet inside trim ( gear leaver ) Clean in side and out Quote Link to comment Share on other sites More sharing options...
vodkashots Posted June 13, 2012 Share Posted June 13, 2012 Well its Running as from 10pm it started on the first fire ... ( after priming for few mins ) .. Spent the morning with vody and his gear box didnt start getting my engine in till 4pm just need to sort Rad & Fans out Prop shaft Exhaust bonnet inside trim ( gear leaver ) Clean in side and out awesome bud, looks like we are both going to make pod in the zeds this weekend lol Quote Link to comment Share on other sites More sharing options...
Baz Posted June 13, 2012 Share Posted June 13, 2012 Great work Mark, you certainly dont hang around! :thumbup: Quote Link to comment Share on other sites More sharing options...
daZvert Posted June 13, 2012 Share Posted June 13, 2012 Great work Mark, you certainly dont hang around! :thumbup: That`s what I was thinking!! top job Quote Link to comment Share on other sites More sharing options...
MarkDerby Posted June 14, 2012 Author Share Posted June 14, 2012 Not much left to do now .. Front bumper Take of Ramps Bonnet ECU Refit Clean and Polish :clap: all i can say is i'm fooking nackard back,hands really stiff shed loads of cuts,crazes all over my hands ... lump on my head and i'm falling a sleep just writing thiZZZZZZZZZzzzzzzzzzzzzzzzzzzz Quote Link to comment Share on other sites More sharing options...
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