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Location:
Rocklea qld
Registered:
February 2003
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Location:
townsville NQLD
Registered:
February 2004
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Re: 18rgeu valve and cam questions
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Mon, 13 September 2004 23:53
 
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talk to mrdohc, he put oversize valves in his rg head cant remeber what they were made out of though
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 00:01
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How did you ever bend valves in an 18rg? I used to rev mine to redline for years and never bent a valve even when the timing chains used to rattle during oil bleed up?? Shaun Maloney has all my shims so can't assist in that area..
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 00:14
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i dont know how they got bent...i bought the head so i had the proper efi one. They may have been damaged before i got it but i didnt see anything wrong with it.
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 01:02
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OK understood. Shit happens.. Heads are bullet proof get two used or new valves and lap them in lightly by hand. Shims may be a problem so note which shim comes off which valve and mark it. Shaun maloney has a full set of my old unused shims if you need them. Phone number in the forum eslewhere. You should be able to get the ehad fixed pretty quickly dont reinvent the wheel. We had my engine pulled down and one dickhead was cleaning the pistons and dropped one and broke the skirt. We found another second hand piston that miked up well and its been in since 100,000 for 140,000 like I said engines are pretty strong. 2 cents
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 02:01
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yeah im currently trying to hunt down 2 second hand valves but have had no luck yet...Do u know if the 88250 heads and the 88270 heads are the samd design as in can i get another 88250 head and put my 88270 valves, valve springs and cams in or do the valves not fit. Its just i have a little corossion around the water ports which im a bit scared of. I can get it fixed but then they will need to take to much meat off the head to flatten it and i dont wanna raise the compression. Im trying to lower it.
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 02:14
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I will check through my stuff but not sure if I have any valves maybe inlet unsure.
Yeah watch the skimming been there done that with datto head now suffer long oil gallery pump up time not to mention in Toyota head that only valve clearance adjustment is by shims and you won't have any.
Stephos site is best for the head types he has all the knowledge you need.
wstephenson@qrsciences.com
web  site
http://ourworld.compuserve.com/homepages/stepho/ho mepage.htm
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 02:17
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TOYAPARTS are now TOYA DATTO in Melbourne that guy has all the latent knowledge from the twin Cam development era of 1980-1985.
I gave them all my spare engine stuff about 20 years ago.
Dont know what 18RG stuff is still a round.
Do an engine search on the Google engine you may find some stuff but highly priced.
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Location:
adelaide
Registered:
May 2002
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 03:33
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Okay when i bought my 18Rgeu it had bent valves.
Dont know how cos the previous owner said it went very well, but when we pulled it apart the top timing chain was very stretched and a couple of the inlets were bent.
new items were sourced thru Stewart Wilkins Motorsport.
later down the track i was driving the car at low engine speeds and the ex cam gear decided to snap the dowel holding the cam gear to the cam.
Pulled the head off again and noticed all ex valves bent. doh.
so more new valves sourced along with new valve springs throughout the head, put it back together and shes run fine havent had a problem with it(touch wood), and it is my daily driver.
this is my bent valve story.
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 03:49
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Ouch dowelled cams to get better valve timing and anti pollution measures. You know the ball tearing 210 headed 18RGR engine cicrca 1974 had non of that crap it had basic high lift cams and a three bolt non geometrically adjustabale cam and revved like crazy. Then Yamaha got involved said yeah we make better heads, put in the dowelled cam with the single big bolt and flat washer, and it all went down hill. Lower revs less power..
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 03:51
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Expert Shaun Maloney melbourne 03 9428 5277 65 Butler Street Rihmond Vic
Just looking at my compression rpessures scrawled into my engine book in 1976 170/175/172/175 cool huh..
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 05:09
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are all rg and rgeu heads have the same valves???I did look on there just after it happened and only found a listing for 18rgu head valves. I may be on the look for a new head as i think the corrosion around the water ports is getting a little bad also
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 05:10
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| RT104GT wrote on Tue, 14 September 2004 13:51 |
Expert Shaun Maloney melbourne 03 9428 5277 65 Butler Street Rihmond Vic
Just looking at my compression rpessures scrawled into my engine book in 1976 170/175/172/175 cool huh..
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I had 120 , 120 , 0 , 0
Not so cool huh
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 05:47
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Early heads had softer valve seats as not designed for ULP.
But you are unlikely to find an earlier head.
if I get a chance I will check my head numbers.
Stepho is best bet send him and email or browse his page it has heaps of twin cam stuff.
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 06:39
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who is stepho. im chasing a head in brissy but valves can come from anywhere. How much do u know about the oil pumps on them
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Location:
Western Victoria
Registered:
September 2004
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Location:
Hobart
Registered:
June 2002
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 09:08
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| RT104GT wrote on Tue, 14 September 2004 15:47 |
Early heads had softer valve seats as not designed for ULP.
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does this mean your saying early heads are unsuitable to run ULP (high octane). Some other people on this forum are of the opinion that because they have alloy heads the valve seats will already be hard enough for ULP.
i have 88210 head (early head) and run PULP (96 RON).
this is of particular interest to me because im running EFI on an early head and an o2 sensor. LRP will srew my o2 sensor, but i dont want my valve seats to get fucked either.
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 09:28
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The 210 head on the twin cam from the 1973-74 series 18RG's were not efi they ran from dual solex sidedraft carbies at 9.7:1 with points ignition and were designed for high octane fuel 98 RON. That is my firm belief..you shoudl ask an expert maybe. Very few people know other than 1980 series Yamaha heads off efi model 18RGEU's. But some solex carbied 18RG's ame in from Japan at API Springvale.
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 09:40
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I presume you run EFI, what timing settings??? Do you get any pinging?? Figures for timing the 210 head and camshaft assuming you have the early non dowelled camshaft are..
as follows..
PLUG heat range W20 or BP5
Plug GAP 1.00 mm
Dwell angle 50-54 degrees
Point gap 0.45mm
Static timing 5 degrees BTDC (engine stopped)
Cold engine 20 degrees BTDC (reference only)
Timing always set at 60 degrees Celsius when HOT engine 5 degrees per 1000 rpm BTDC.
Valve clearances 0.26 to 0.33 MM using shims. for Inlet
Exhaust is 0.31 to 0.36 MM cold.
Compression should be 185 PSI and if below 1`40 psi are crook valves or rings.
Head warp limit 0.050 mm
valve lap details
45 degrees angle
1.2 to 1.6 MM contact area if good condition.
There are four different colour inner valve springs.
etc etc
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Location:
Hobart
Registered:
June 2002
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 09:59
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i've converted my engine from solex carbies to efi.
running 9.7:1 pistons, but with later dowelled camshafts (88250). ive got 160 +\- 5 psi on all cylinders. I would like to get hold of the original camshafts (210 or 230).
the cam timing is factory. well factory for those cams anyway. The notches are stright up at TDC compression stroke. I'm thinking i might play very slightly with this to see the effect.
i run premium unleaded and im not getting any pinging. Compared to carbies it has more torque down low with little effect up high.
For a daily driver it is sweet, starting perfect, runs good no matter what the wheather is doing, and you dont need an expert to tune it.
i tune it on the street using feedback from the seat of my pants and the o2 sensor.
you say ignition timing is 5 degree BTDC, i think ive seen 10degrees quoted elsewhere. with my combination i think its a matter of trial and error. Thats why im planning to get computer controlled ignition running aswell.
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Location:
Western Victoria
Registered:
September 2004
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 11:00
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Just spoke to Steve Baird Toyota mechanic for 30 years and twin cam expert whilst he says he would not run the series on LPG that PULP PLUS upper cylinder lubricant additives is ok but timing is critical.
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Location:
Hobart
Registered:
June 2002
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Re: 18rgeu valve and cam questions
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Tue, 14 September 2004 11:11
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| RT104GT wrote on Tue, 14 September 2004 21:00 |
Just spoke to Steve Baird Toyota mechanic for 30 years and twin cam expert whilst he says he would not run the series on LPG that PULP PLUS upper cylinder lubricant additives is ok but timing is critical.
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when you say LPG do you mean LRP??
so he says PULP + upper cylinder lube is ok.
so when did the heads get harder valve seats, 88250 (18r-gu) and later???
ideally i would need 98 RON and upper cylinder lube.
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