lukevl

Yeah but I'll have to join in via satellite! I'll post some sausages down lol

Profile (I think I really should check that), and the shaft diameter (That is the un machined casting surface) is larger on the R34 GTR cams. I don't have any R34 ones here atm, but if someone puts up a pic you will see what I mean. Its that noticeable, as soon as I picked one up I could feel it and was like 'Whats going on here?'

You boys seem to be more than equipped with the skills to do the conversion. I promise you that is not the problem. But then again, everyone already knows how I feel. jnr32r - What do you mean by 0.1mm thicker? Do you mean the base circle diameter is larger by 0.1mm? If so, this is because when measured with a mic, you actually measure part of the ramps too.

Roy - No I don't. I am being polite as I don't want to fall into the whole 'I give you x amount of cash if it actually works' again. Put it this way, if it works, I know a LOT of people in the camshaft industry who would be very surprised.

I am very interested to see how you go with the GTR cams SK. If you like, send me the cams and I will do a cam dr on them for you for free and give you the spec sheet (They should be the same as the solid profile posted before) I would really like to know how it goes. God I wish you weren't in the southern part of our country so i could see it with my own eyes. Got a video cam????

Oh crap, I'm back already- but only briefly I glanced past and noticed your base circle query. Base circle is the same on all models of RB twin cams (32mm). R34s have a larger shaft diameter which makes them easy to pick. Not to mention different drives in the front of the camshafts.

I give up. I have done all that I can on this topic. The one thing I didn't mention is that hydraulic lifters have a running cleearance of between 0.1 - 0.15mm as stated by the SAE. Ask any camshaft 'specialist' they will not recommend runnning solid camshafts in your hydraulic motor. BTW Sydney Kid - sorry I didn't read your extra long post because I don't have time, but I'm sure it had some truths in it. I am literally exhausted with this arguement. Good luck.

It took me almost 10 mins to do them! Each grid is 100 degrees crankshaft rotation. Figure it out. It is not that hard. Did you do yr 10 science? lol Look at the lifts, the hydraulic looks like a sine curve and the mechanical looks like a hydraulic but propped up on little linear ramps. I'm going home for beer and sex now and I won't be back till tomorrow so have fun slandering my pictures for the next 24 hours that I slaved over :bs!: for the benefit of the viewing public. :aroused:

Also I could give you specs and all the hoo-haa but you wouldn't get it and it will not help you to understand the plot. Sorry boys I'm just a bit cheezed off by this cause I thought it would make it heaps clearer. :headspin:

The graphs are not meaningless they have values on the axes! Look at the mechanical GTR profile. IF you ran zero clearance (follow the bottom of the graph) You get about 370 degrees seat duration. A top fuel dragster will run about 340-350 degrees! Thats about 180 degrees of overlap. Honestly, I don't know why I bother. Go home champ

Oh Damn! I'm in. Can I see a pic? Surely you have ten people. Don't cancel it.

Okay guys, don't say I don't do anything for you. Mechanical and hydraulic lift vs crankshaft angle. make sense now?

Absolutely correct.

ylwgtr2 - Sorry mate I did a bit of research and apparently even in running coniditions, a sodium filled valve will expand less in exhaust temperature than an inlet in its lower operating temperature. So yes thats why they hve those settings. Although I didn't exactly doubt this, i know for sure now and so does everyone.

Hahaha! Is your number plate meant to represent Skank? Thats funny as hell if it is. If its your initials however - sorry.

Yes Browny- you got it. If you look at a Solid camshaft, there are no rub marks from the lifter on the base circle, but on a hydraulic you can see rub marks all the way around because of the lifter preload pushing against the base circle. (Thats if you can see the marks. Its easiest on an old school push rod donkey ) Thanks for the settings Browny. I have been told by a few 'performance workshops' that the settings are like 0.35 and 0.4"? I didn't expect there to much truth in that but. Oh well thats good nissan specify the correct settings (Or close to it)

Look at any decent race car - multi throttles. Gotta love response. Big single is a huge wank. maybe for tope end drag cars, but who wants one? The only problem I have found with the RB25 lower runners is that 3&4 dip down to make them equal length which makes it hard to put a flange on them. Still deciding on which way to go at the moment in terms of attaching the throttle bodies.

i have never seen Nissan clearances. I know what they are meant to be because I have cam doctored GTR camshafts, plotted them and found out what clearances are needed to run them at. Noramlly you put 0.05mm more clearacne on the exhaust to accomodate growth. Anything half decent runs Inkinel (spelling) or sodium filled exhaust valves. At the end of the day who gives a toss? GTRs have big ramps and need larger than expected lash settings. Nissan set them closer than they need to be. I bet they didn't set them at this setting for emissions testing but... If you are a hard core racer, you set the tappets wider than usual and you eat valve springs, but thats the price you pay for HP. Do not run Solid camshafts in your hydraulic car. Its not fair to people like jnr32r who take your word and end up wasting their time and money trying it. Try to keep the BS to a minimum and this will be a nicer place.

I consider myself to know a reasonable amount about cars and I have seen lots of Sydney Kid's posts and I have never seen anything false written by him. Its not like I say 'Oh that sounds like hes right'. Instead its like 'Well **** me, hes right again'. He does seem to struggle with camshafts but haha. I don't know who this Steve clown is, but I hope he doesn't claim to be a performance workshop of any sort.

Sorry I phrased it wrong. GTRs have a lot of valve growth and this is characterised by their larger than normal ramp sizes. Honestly I think they specify their clearances to be so tight purely to make the GTRS sound tough. And man does it work! If you run the 'right' clearance in the GTRs it would sound a lot more sedate on idle and low speed running but still make the same HP.

I dont' want to sound like a spoil sport - but whoever put GTR cams in their car and had it idle didn't use GTR cams. You got ripped. The reason that GTR cams don't work without going into too much detail is that mechanical cams (all GTR and R34 GTT) have a linear lift ramp which in a GTR is app. 0.55mm high and takes something like 50 degrees to reach that point. In a mechanical cammed motor the clearance should be set at the point where the ramps meet the cam lift. (at hot running) So in a GTR, the tappets should be set at about 0.5mm, but Nissan recommend a smaller clearance which not only makes the car sound tough as (as GTRs do) but allows for a lot of valve growth (which GTRs do). IF you run the GTR cams in a hydraulic cammed motor, you end up with cams that have about 360 degree duration on the seat instead of about 240! This is utter stupidity and should not be done. I am not taking a slash at the people who have done it, but at the people who say it is good and can be done. If it does not make complete sense to you, don't worry it takes a while to get your head around, and I can draw you a picture one day if you want. Luke

bump

BU5TER - can you please PM me with your number.

As title says. I don't need the throttle bodies, but I will consider anything. (non sexual) Thanks!

Yeah hes a bit useless thats all and doesn't get a chance to go out and find car places. I thought someone on here could supply a plenum. Can you get me a price please Rezz? Thanks