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Location:
Hobart, Tasmania
Registered:
May 2003
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 18R-G Identification?
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Sun, 04 January 2004 09:03
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How do you tell which 18R-G motor is which?
Mine has a Toyota head (as opposed to Yamaha). I have a feeling it is an 18R-GR but am told it is more likely to be an 18R-GU.
Confused!
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Location:
Hobart
Registered:
June 2002
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Re: 18R-G Identification?
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Sun, 04 January 2004 22:30
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search for 18rg heads on this forum. There is heaps of info about this.
or to save you the effort...
just compare the number on the front of the head with these numbers.....
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Here's some head numbers off Al's 18RGs:
> 88250:
> - 49657 single spring early rgu single dump ex ok head small studs on ex
> - 52978 same as above
> 88253:
> - 73086 double spring late rgu good head to start with large studs on ex should be duel dump man
> - 62744 single late rgu still good head may be small stud ex should be single dump
> - 81784 double spring late also
> - 87278 double spring late also
> 88270: these are ale efi heads all double springs alll good heads these are the ones you use
> - 35140 biggest ports biggest valves no smog ports best casting
> - 08037
> - 49383 very late head newest ive seen
> ?:
> - 81225 same as above double late rgu if the head is a 11111-88253 not a 11111-88270
> 88253 88270s would be the heads of choice since these need very little work from the factory these willl make lots of power with little porting they will make a lot more power with a lot of porting the castings are a lot thicker around the ports so there is a lot of room the 88250s can be made good but the ex studs should be changed up to 10mm ones for best sealing all of these engines should have 8.5s to 1 but the efi 88270 heads they should have 8.3 to 1 just be glad you dont have any of those 11111-88230 or 88210 heads they are good paper weights.
Hope this helps your info of what you got there sounds like my garage
I think i have 15-18 heads right now
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Location:
Hobart, Tasmania
Registered:
May 2003
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Re: 18R-G Identification?
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Sun, 04 January 2004 23:10
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Cheers Chris - that will help a lot. I did not even think to search the site.
BTW Chris - I am looking for A/C compressor mounts for an 18R-G. You don't have such a thing lying around do you?
Thanks
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Location:
Hobart
Registered:
June 2002
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Re: 18R-G Identification?
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Sun, 04 January 2004 23:28
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no worries
Nah i dont have any A/C mounts. Who needs A/C in Tassie anyway??, lol
Does the AC compressor mount on the head?, if it was mounted on the block the mounts would be the same.
actually i dont have many 18rg parts at all and i think they are hard to find in Tassie. i consider myself very lucky to have the EFI manifold.
cheers
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Location:
Hobart, Tasmania
Registered:
May 2003
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Re: 18R-G Identification?
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Sun, 04 January 2004 23:40
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No worries. I think you are right - 18RG parts are very hard to get here, I too, consider myself lucky to even have an 18RG.
The compressor mounts on the head and is on the opposite side to the mount on 18RC. I just wanted to keep the A/C as I use it a lot (6 month old daughter) and all i need is the mount. I might have a go at making/adapting something.
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Location:
Hobart
Registered:
June 2002
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Re: 18R-G Identification?
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Sun, 04 January 2004 23:57
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Where abouts did u get your 18rg from?
My current one came in a car from Rokeby, where is was sitting for 4 years.
My first one came out of a T-18 in Howrah, that engine is now in my old RA40 which is floating around hoabrt a bit.
There is another guy who has one in an RA23, or he did have, i think he took it out because of problems.
Another one is in an RA40 owned by a guy at DDS Auto
I've also seen one in a little triumph thing up near ferntree. His was turboed, he had a number of parts hanging on the wall. (including pistons with holes in them, lol)
Probably one or two others getting around aswell
There is a yahoo group called hobart-toyota, it doesn't get many posts but there are a couple of knowledgeable people on there.
http://autos.groups.yahoo.com/group/hobart-toyota/
cheers
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18R-G Identification?
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Mon, 05 January 2004 02:44
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yes that information above has been taken from one of my 10000 responses regarding identifying 18R-G variants.
Regarding the AC brackets - yes they are completely different to an 18r-c item. The AC compressor is also completely different. I do have a spare ac bracket for an 18rg at home, but i wonr be back in the country until march.....
here is what the ac looks like on an 18rgeu
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Location:
Adelaide
Registered:
June 2003
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Re: 18R-G Identification?
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Mon, 05 January 2004 07:14
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If your engine has the toyota head then it will be an early model.
All the 18rgu heads that I've seen have had the Yamaha labelled head (they are all yamaha heads, just that the later models were labelled so.
18rg-r, These are quite uncommon, so I reckon you'd most likely not have one of those.
Have a look at the front of the head, what is the number?
88210? - 145 hp early model, good pistons (9.7:1), good cams, small port and valve head
88230? - much the same
88252? - 140 hp good pistons (9.7:1CR), large port and valve? not so good cams
anything else? less power, but better head than 88210/230.
Does that answer your questions?
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18R-G Identification?
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Mon, 05 January 2004 16:29
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steve.... you will find the following actually:
8821* - first model 9.7:1 pistons, small port head, big cams
8823* - similar top above, small improvements in strength (not power)
88250 - 8.7:1 pistons, bigger ports, 45/37mm valves, wussier cams
88253 - 8.7:1 pistons, bigger ports again, 45/39mm valves, same cams as 88250
88270 - EFI head, 8.3:1 pistons, same head as 88253, wussier again cams
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Location:
adelaide
Registered:
May 2002
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Re: 18R-G Identification?
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Tue, 06 January 2004 01:37
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So A/C compressor sits above the altinator on the 18R-GEU?
Do you run them on the same belt? probably...
wouldnt the compressor get real hot right up close to the extractors?
ohwell i hope i never bother to fit it to the ra28, just excess weight..
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Location:
Hobart, Tasmania
Registered:
May 2003
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Re: 18R-G Identification?
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Thu, 08 January 2004 08:45
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Thanks for all the info.
The number on the front of the head is 11111-88230. Is this any good?
I cannot say if the A/C Compressor mounts on the same belt as the alternator as the brackets will determine how far forward the compressor goes. I have a feeling that it will not run the same belt.
I too am concerned that the compressor mounts above the exhaust manifold - it seems strange.
Yes I am interested in the A/C mounts and I can wait until march. Is the compressot available too?
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Location:
Seattle area, USA
Registered:
June 2002
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Re: 18R-G Identification?
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Fri, 09 January 2004 02:00
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actually that list came from RGGuy(Cary) in the states.
it was posted over 2 years ago on the yahoo celica group..
just fyi..
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Location:
Seattle area, USA
Registered:
June 2002
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Re: 18R-G Identification?
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Fri, 09 January 2004 02:08
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88230 heads are OK. but could be better.
the A/C runs off the front groove on a 3 groove pulley.
the water pump, alt, crank pulley are by themselves on the furthest inside groove. havent seen the middle groove
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18R-G Identification?
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Fri, 09 January 2004 05:14
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yeah sorry wil...shouldnt have taken the credit. i meant that i have used that info about 10000 times on these forums....
88230 head isnt the best.... but the pistons and cams are the best.
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Location:
Seattle area, USA
Registered:
June 2002
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Re: 18R-G Identification?
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Fri, 09 January 2004 05:22
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the 230 head can be ported quite nicely though.
and getting the later valves to fit is a cinch
like throwing together the best of all parts
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