Gerg_R31

RB20 Main journal size 1.7699in / 44.956mm RB25 Main journal size 1.888in / 47.956mm 3mm of clearence would rattle and vibrate into a big bang, still it wouldnt build up enough oil pressure to start this guy has no idea what they are on about how much are they asking?

http://wiki.r31skylineclub.com/index.php?title=Main_Page they have the full manual conversion, all parts needed, a how to, and wiring instructions

still estimated 6-7k for the rb34 kit?

i did find a 100mm rb stroker crank through one of our customers, he is asking for 7400 for the kit, though with some v6 stroker cranks from them the quality wasnt the best, on dummy assemble we found the strokes varied per cylinder and we had to off set grind a plus 30 to rectify

since the rb series is a straight motor not a v shape and the crank has already been balanced you can balance the rods without having to worry about the crank getting balanced at the same time knife edging isnt a bad idea, the counter weight slices through the oil preventing drag increasing torque, and reduces weight aswell, but will need 2 be rebalanced i found with my rb30e the adjustable cam gear only adjusted when the reground cam kicked in no kw gain speak to malcom at camtech he made my cams for my rb25 head (nearly rb26 head) it has 10.8mm by 280 deg and he has the billets all in stock ready 2 be ground oh and the cams lobes need a bit of clearance where it meets the head to prevent vapour lock

yeah i had to grind my head out to fit the cam

as a fellow engine recondtioner there is alot to be added porting: porting is not noitced down in the lower rev range, forced induction porting is usually bigger ports but usually the same idea in they way it is ported out as the n/a ports, too much taken out can slow down the flow, too much polishing can prevent the air fuel mixing. there are also many different methods and ways ports are done and can have different effects in different engines stiffer springs: with standard cams pointless, only needed if the maximum coil bind of the springs will be greater then the maximum lift of the cam seat pressure: standard is usually around 60 ft pounds 80 to 100 ft pounds is the maximum cams: most if not all cam grinders will tell you at what rpm the cams will kick in, n/a cams having more overlaping can lower the raised compression ratio due to being open longer and less time to compress, forced induction has less overlapping bringing up the compression ratio, sometimes if the cams are too big it can drain the power combustion chambers: surface grind the head CC the chambers after the valve seats have been cut and make every chamber exactly the same valve seats: usually there is a standard 3 angle crown seat and throat but there is many diferent cuts to add better flow, there is the raidius which is the 3 angles rounded into each other right up to cnc seat which have 29 angles on the throat and crown compression ratios: very debatable, changed via piston cc's reboring/honing block, i prefer to make the pistons flush with the deck, run a cosmetic head gasket and then take the remainder off the head, 10.5:1 is the most on pump fuel and its shitty quality. 12:1 if u can garantee good fuel with octane boosters

to clear up some of this the rb20/25/26 cams cant be reground due to lack of material cams can be ground from billet steel (rough moulds) to suit researched specifications usually what they have called stages with the rb26 being a shim tappet/lifter what ever u wanna call it, you have to re measure with feeler guages at the base circle of the lobe to bucket clearence to make sure it is within specifications

any updates on the stroker crank?

yeah my work gets the shims from them but thought it be cheaper to get a set of 2nd hand shims as my cam supplier said that the standard thickness should be fine the cam i'm running has 10.8mm lift and 280 duration

i ment as in rb26det/tt i have an rb30 bottom end with an rb25 cylinder head, the rb25 guides have been reemed out to suit rb26 valves, i have the rb26 cams, springs, retainers, and buckets, i have done all the machine work and all i need is the shims to finish it off the cylinder head, it is a N/A build

I'm after a full 24 set of standard rb26de shims that sit in the retainer above the valve I already have the buckets name your price located in sydney willing to pay extra for postage

thanks 4 that

i understand but i think they ment the oil squirters that sit in the crank case area just under the sleeves

if it looks cracked, or teeth missing chips replace usually they say every 90,000 to 100,000kms if u dont and it snaps you WILL need new pistons and valves as the 2 meet at a very fast pace bent valves can also equal cracked valve guides, distorted valve seats, the dust from the chunks taken out of the piston may end up getting picked up in a main bearing journal alot of machining work and labour hours/costs involved unless u get lucky and the bent valves do minimal damage, but still $30 + per valve isnt cheap at 24

been searching for ages but cant find anything Im after both the intake and exhaust cam specs for a standard Rb25 with VVT that came out of a R33 skyline I want to know the; advertised duration, duration @ -050" and the lift

what are you on about? bearing seat? you mean the tangs (little notches in the big end tunnel of the conrod) or you talking about the actual big end tunnel or big end journal? 1/2 moon slot the sides?

doubt its a joke, and its definatly not by the government some moron has left a link so all you can do is read their bullshit cause or donate to their anti government bs

there is a link in the bottom right which is a anti government propaganda bullshit so we have been hacked

went to check the forums and i ran into this

i was there representing the r31 club and a few of us had very little mods done since last being dynoed ie me auto to manual on another dyno i got 100.2kw in the auto, this dyno i got 93.6kw manuals always have more kw another guy pulls 137.8kw with his na rb30/26 i think he barely got 123kw my opinion he has set it so we are given a false reading so he can add his sales pitch "if i installed this ecu and tuned it u can gain XXX kw" which everyone i spoke to got told i call bullshit i beleive he was trying 2 reel in customers

i personaly wont be making them. i was asked to find out the interest and have let the guy know there is heaps, will keep everyone updated will tell him about the SR interest too he will be making with all carbon fibre (not standards covers with carbon fibre on top) cam covers coil pack covers top timing covers

full carbon copies, not sprayed onto current covers something about a certain mixture of something i had no idea he was talking about but all i understood was it should make them very heat resistant price, unknown, since there is interest ill let him know and then he'd prob tell us the costs of making them soonish

any updates yet?

one of our sydney based customers has asked me if there is any interest in carbon fibre cam covers and coil covers, if so he might start making some. dont know of price dont know when would be available all i know he wants to make the rb20/25/26 if there is enough interest cheers