For the love of a tractor engine: The life and times of the 18R-G

[LTJET]

Ok after spending a little while searching both the new and old forums as well as the web. What is the best off the shelf item to buy that would replace the oil pump in an 18RGEU?
Also is the water pump for an 18RC the same?

P.S. FYI: Engine builder says no to running entirely on 98 octance and yes to AV Gas. 10-10.9PSI is fine for 98 octane. Anything more he says i must use AV Gas to save detonation/blowing the engine to bits.

[o_man_ra23]

18RC water pump is the same, yes.

I am also interested in the suggestions for the oil pump, but have not seen anyone give a definite answer as yet. Would be great if something has been found though.

And your engine builder doesnt seem to believe in the ability of good engine management to keep an engine in one piece using pump fuel and boost. Plenty of engines running much higher boost run happily on 98RON fuel (Brett_Celicacoupe's old RA40 1GGTE running 16PSI springs to mind)

[RAd28]

P.S. FYI: Engine builder says no to running entirely on 98 octance and yes to AV Gas. 10-10.9PSI is fine for 98 octane. Anything more he says i must use AV Gas to save detonation/blowing the engine to bits.

must be a mis-understanding there... stock 1G runs 12psi, and will more then easily handle 14+ with no other major mods... besides, saying that 98ron has a 'boost limit' isn't valid... depends on combustion pressure more then anything (afaik). open just about any tubro import mag, and you'll find cars running 30+ on PULP...


any of you guys got links to 18RG performance bits other then toysport and toyhead??

[LTJET]

Possibly a misunderstanding on my behalf. He said its just safer to run av gas then standard pump fuel even though it can be done.I guess every performance/engine buildng place will have a different view.

I've noticed theres no definate answer to which oil pump. I also haven't found how much oil these things pump to even compare to anything else. Anyone know the figures?

Lastly i've just recently found an article of a dude running 16psi on stock standard internals with mild work done and compression lowered to 7.5:! on an 18RGEU.

[o_man_ra23]

That lowered compression makes a big difference to how much boost you can run. Try running 16psi with 9.7 pistons and you will be getting a lot more bang each time the spark plug fires!!

[The Witzl]

i've been meaning to do a test on the flow rate of an 18RG oil pump... but i need a partially assembled engine to work out the gear ratios (how many oil pump revs for each rev of engine)... all my engines are either in cars, sold, or being built now.

I would LOVE to find a pump impeller that could be directly used, or machined down and used in an 18RG pump housing (with extra spacing) to get extra volume.... but without buying about 100000000 pumps and comparing, i have no idea where to start!

[hosking1991]

will my electronic 18rc dizzy run well on my 18rg cause i was reading on the old forums somthing about 18rgs using 18rc dizzy's lack top end revs (ie wont rev past 5000 rpm)

cheers

[o_man_ra23]

If you have an electronic dizzy, its probably a 22R centre in an 18R dizzy. I used one in my 18RG... but I had alternator woes which stopped me giving a direct comparison between the electronic and 18RG points dizzy.

[The Witzl]

i've done the points to electronic (22R-E retrofit) conversion, and back to back it made a huge difference.

Idle quality improved, as did the higher end of the RPM range. Was just smoother all-round.


Full electronic controlled ignition is better again, but requires an ECU

[Roscos]

Never had a problem with the electronic dissy, installed it and forget it, it worked that well.
The problem now is it will have to be swapped to the other 18RG motor which is an EU motor and the timing covers are different as to where you screw the dissy in. How do you bolt it down, before someone asks.


Roscos

[airfireman1]

You are right,there are a couple of different timing covers, the early type uses the clamp to hold the dizzy just like the 18rc ones and the later cover uses a bolt and the dizzy is a different housing. I had this problem when I replaced the 18rgeu timing cover with a 18rg item.Fortunately I had a electronc 18rc dizzy so it bolted up ok you will need too find a dizzy housing that suits and swap it over.
When I bought the rgeu it had the wron dizzy fitted, and was clamped down but not very successfully. As I said I waas fortunate to have some spares to swap it with. Then I changed the timing cover and had to swap the dizzys back.
someone out there will have the right housing so you will just need to swap the internals

[Roscos]

All the blocks should be the same, you wouldn't think Toyota would change the design.
On the RGEU block there is a thread hole behind the dissy so you could change it but all that would be different would be that the lug off the timing cover.

On another note there are pipes hanging off exhaust side of the head. Can l unscrew them and plug up the holes or what? I think they are for heat exchange on the pollution gear and l have taken all the polution gear off. Should save about 100kg.


Roscos

[sbfoot]

Do you need to change spark plug type when upgrading to electronic ignition?

[airfireman1]

As stated all the blocks are the same, its only the timing covers that changed.
Yes you can block those holes on the exhaust side of the head. just make sure that what you use to block then off does not interfear with the exhaust manifold bolting flush with the head. Those holes were deleted whith the 18rgeu and must be generic for the 18rgu.
No you should not need to change the spark plug type. You are still getting the same spark its just more stable.

[o_man_ra23]

You can use the 22RE spark plugs... they are basically the same, except come with a 1.1mm gap instead of 0.8mm which will give you a more even burn.