Gerg_R31

found

$620, machining offer gone

Im after the bolts that connect the break line to the caliper for an r32 4 piston break caliper need asap message/ post and ill get contact details (prefer to pick up asap)

i've personally tried to convert a rb25 head with all the rb26 internals rb25 intake springs are the same height and tension and coil bind as all the rb26 standard springs rb25 exhaust springs are shorter Rb26 Exhaust valves are sodium filled and are wider, i had to reem and hone the exhaust guides out which left the guides really thin, cant use the rb26 exhaust guides as the guide itself is much wider, cant drill the head to suit incase too much is taken out and the guide wont hold when the head gets hot (more so being exhaust) both the intake and exhaust valves are another inch longer then the rb25 valves rb26 installed valve height is aroung 1.550"-1.600" in a rb25 head with rb26 valves 1.850" and 2.050" on exhaust, i couldn't find any springs to suit without a 6mm spacer then there is the retainers, the rb26 use a cup style retainer to locate the shim that sit under the bucket the standard shims are around 0.100" thick i needed some that were 0.280" thick long story short the measurements create head aches, and without going a 1 off spring set there are no springs available but; there is a tomei solid lifter set for the rb25 which ive done rb25 cylinder heads at work and converted them to the shim, which has a stem on the inside of the bucket to compensate for the extra space where the lifter was, and the shim to valve clearance needs to be set on that (wish i knew these existed before i started the work on the head) you would also need to see if the valve springs will suit the cams hope that helped

bump?

if this is a ej25 vs rb25 could someone fill in the following ej25 bore stroke compression ratio induction flow in cfm turbo flow turbo pressure ratio boost turbo surge flow cam lift and duration rb25 neo induction flow in cfm turbo flow turbo pressure ratio boost turbo surge flow and i can use my dyno program thing to put up a couple graphs that show the torque and power curve

i signed up to vote for the worst possible choice everytime, but i doubt there will be much choice anyway... failed pimp my ride (but they do have a white r31 in the background of the intro video)

the motor from put into this

larger compacity, more to compress, more to propell after the spark, as a basic mechanical principal blocks with a bigger bore then stroke, square bore and stroke, bigger stroke then bore, mis-matched cam profiles, match cam profiles, big lift small duration cams little lift big duration cams, cam and ignition timing, turbos v superchargers, nos av-gas pump fuels, valve to chamber angles, port angles, valve seat angles, diff ratios, gear ratios, volumetric efficancy, atmospheric pressures above or below sea level with or without boost volumes, tyre compunds and pressures, all different possible set ups to create endless different vehicle characters so id say the swept volume of a cylinder may play a small part

i still have no idea what we are trying to discuss in this thread

plus 20's 30's and 40's arent an issue if they are honed properly with the correct clearance set by the piston manufacturer, if your worried, grout fill the block, get an ultra sound check on the bores to see if they are thick enough, plus 40s are a big over size but doesnt mean the engine should be nursed, ive seen some rb blocks go to plus 60s before they have to be resleeved people do worry about going to plus 40s as in some motors its the last oversize, but it doesnt affect the performance, just means if you break it, you will pay more to fix it next time and some one off piston designs are only in a plus 40s

im using a +40 thou 10cc dome JE piston, made from using 2 molds, which has eliminated the extra piston to deck height that comes with using rb25/26 pistons

i usually remove the grub screws, use my hot tank at work and replace with new grub screws

you could buy a 2nd hand motor and you wont know the condition till you turn the key but if its all properly machined (you could even upgrade the internals) you can garantee it runs better then before (as mentioned, never re use used bearings/ rings/ gaskets as these parts are designed to take wear and tear so the other parts dont)

for $1000 if you supply a rb26dett cylinder head, valve springs and valve stem seals, i will supply the cam (as above) and; I will chemically clean the head, re face valves with a full cnc valve seat job, light surface grind (or to match an exact cc you want) machine the head to prevent the cam fouling, reset the shim clearances, for $1500 i will supply the valve springs to suit, and valve stem seals. $2000 if you want it ported as well it will be a little bit more if it needs guides unless they are supplied (im not too sure on what our costs are) (all these prices cover the parts and materials that would be used, they are not standard machining costs, this is pretty much labour costs free, there will be no warrantee as i will be doing the work in my own time minus the porting)

still for sale

ive only seen 1 type of the solid lifter conversion for the rb25 the rb25 solid lifter buckets have a stem on the inside of the bucket, and the stem sits into a cup like shim the rb26 has the solid shim that locates via the retainer

I bought these for $747, brand new, never used them, they may not be HKS Tomeii or other popular Japanese brand names but they work exactly the same, exact same quality just at a better price final price drop $620 firm (plus postage at buyers expense) need these gone asap

price drop $700ono

0.010" grind is 1cc on an unopened chamber

These cams are still for sale, any reasonable offer wont be refused, i'm selling these for the same price i got them for

$400? go low ball elsewhere

still for sale price still negotiable ill throw in these "cam names" these are considered high performance cams, the tomeii version are called "procams" (exactly the same minus the brand name) camtech call these "stage 4"

alot of views but not alot of interest...

Forgot to mention, The price is negotiable