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Location:
Brisbane
Registered:
October 2002
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Location:
Newcastle
Registered:
April 2003
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Re: whart would u call lumpy cams
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Wed, 23 June 2004 08:44
 
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I think some 286 cams with 9 or 10mm lift should be enough for these sort of motors.
At least that is what i was going to go for in mine but i might wait to see what you use and what results you get from them. 
Curious as to what the sheet says is avalible.
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Location:
Brisbane
Registered:
October 2002
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Re: whart would u call lumpy cams
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Wed, 23 June 2004 08:58
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well as far as i can remember the 18RG has about 10.5mm std
details of my cams
Surecam grind number B-12Z-6
lift: .465"{11.8mm} ex: .465 {.455 net}
max lift is at 102deg for intake and 110deg for exhaust {what does that mean  }
duration at .050" 233deg for ex and in
duration at seat: 282 for both
lobe separation 106 deg
timing:
InO: 14.5d BTDC
InC: 38.5d ABDC
ExO: 46.5d BBDC
ExC: 6.5d ATDC
power range 3000-6500, "fast road"
it says down the bottom
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install cam with an intake bucket lift of .125" at TDC and an exhaust bucket lift of .081" at TDC
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what the hell does that mean
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Location:
Newcastle
Registered:
April 2003
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Re: whart would u call lumpy cams {18RG}
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Wed, 23 June 2004 09:34
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Yeah i think i mine where 10mm lift but the lobe is very much throw it open then shut.I was after a longer duration to hold the valve open longer not so much more lift.
As for your cams and installing them,with the motor at top dead centre then the inlet cam should have the bucket down .125" and the exhaust should be .081" lift.If they aren't then they are timed wrong and need to be rectified.
Just need a degree wheel and dial guage to set them up properly and all should be sweet.
Are you just fitting some cams or doing the whole motor as well?Cause if you are doing the whole motor then set the cams up while the motor is in the engine stand with the head just bolted on and no head gasket,also put some play dough on the piston,to make sure the valves will not kiss the pistons.Once you have them right then you can put it all together with the gasket giving you that little bit of extra clearance.
If not the winding over by hand very gently by hand should allow you to feel if they want to hit or not.
Does anyone have the open and close specs for the std cams as i would be interested to compare.
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Location:
Brisbane
Registered:
October 2002
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Re: whart would u call lumpy cams {18RG}
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Wed, 23 June 2004 11:27
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so i dont set them up as std {both cut outs pointing straight up}??
how would i know how much lift there is at TDC
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Location:
Brisbane
Registered:
June 2003
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: whart would u call lumpy cams {18RG}
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Wed, 23 June 2004 12:43
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my cams are 535 thou lift and are 296 duration and at 50 thou are 260 duration and are 100 crank degress at tdc
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: whart would u call lumpy cams {18RG}
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Wed, 23 June 2004 13:23
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your cam/s is abotut he same as my cam.. but mine is 4K 
with injection, idle should be ok.. my cam make peak torque around 4500, and there's not much below 3500.. EFI will help me tho.
what MJH said
if you need a dial gauge, i have a crap one...
start by putting cams in at stock positions, but you may find you need to alter them a little....
start stock, measure lift at TDC and see if you need to move them around...
Cya, Stewart
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Location:
Newcastle
Registered:
April 2003
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Re: whart would u call lumpy cams {18RG}
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Wed, 23 June 2004 18:57
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| Mr DOHC wrote on Wed, 23 June 2004 21:27 |
so i dont set them up as std {both cut outs pointing straight up}??
how would i know how much lift there is at TDC
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The dial guage will tell you what lift there is.
Set it up so it works on the bucket and with the valve closed set it to zero then wind the motor/cam over till TDC and see what lift you have.Adjust from there if needed till you get the right numbers.Degree wheel will tell you what the crank is doing so you can back it up with those settings as well.
Or what Stewart said.
Hope that helps.
Martin
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: whart would u call lumpy cams {18RG}
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Thu, 24 June 2004 06:39
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also in cams as a rule dont worry about if it is say 320 duration cam and has heaps of lift go by the 50 thou mark that will tell how hot the cam is and also how hard it is on the valve train you will need to change the valve springs std lift for the rg are 10.5 mm any way as i was saying 320 duration but at 50 thou only 266at 50
or 296 dur and at 50 thou 262 at 50 the 2nd 1 is harder on the valve train than the 1st 1 so when oredring a cam profile always look at the 50 thou mark .
on the 18rg motor something btw 250 and 260 tops and also for advertised no more than 290 degress ,if using the std valve springs get them tested to see if they can handle the extra lift
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Location:
Brisbane
Registered:
October 2002
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Re: whart would u call lumpy cams {18RG}
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Thu, 24 June 2004 09:48
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duhm didnt een think to set it up on the buckets 
mine are 233 at 50 thou, and i'm getting new everything, new springs, Ferrea stainless valves, new guides and seats ect ect
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