Hey! I know you want one! I am offering some of my 18RG collection up for sale!
I have this engine pictured here, which was run in my white Celica for about a year after this rebuild.
It would not pass an AZ emissions test with the big carbs, so it was replaced.
I have another complete one just like it, and a few extra parts here and there. E-mail me for details.
I am in AZ. If you are closer to Texas, you can contact Jose Hernandez at
johern13237178@yahoo.com. He has even more 18RGs than me!!
This page shows the buildup of a rare Toyota 18RG engine. It was
installed in my Celica and driven for about a year and I don't have a
single picture of the engine IN the car. Trust me, it was in there. It
mounts easily in 74 or earlier celicas without any engine mounting
problems, all stock 18rc brackets work fine. I used an electric fuel pump
because it was already on the car, even though the 18RG can drive a
mechanical one. It bolts to the W-series Toyota transmission. I think I
modified the upper radiator outlet to work with the 18RG. The exhaust
headpipe was a be modified 22R piece. The bolt pattern was a little
different. Maybe an 18RC headpipe would have worked, but I didn't have
one.
The engine ran great, loves to rev. The car ran 16.4 sec 1/4 mile times
and would have been better if the rearend gear ratio was shorter. The way
the car was, you would still be in third gear at 85mph at the end of the
1/4 mile.
I'm actually putting together one 18RG from two. One was complete, but had a
melted piston, blown head gasket and warped head. I found a good long
block in an engine warehouse. It had been sitting on a shelf for 12 years,
and was pretty dusty and stripped of carbs, manifolds and
pulleys.
So I have enough parts to make one complete engine, and some parts left
over.
By the serial number on the head, I think you can find the year it was
produced, it's chamber volume and maybe even compression ratio?
Definately a Yamaha head.
The old pieces of headgasket material were removed from the block with
sandpaper backed by a sheet of glass.
The same is done to the head.
Nice BIG valves for lots of airflow!
This is the hemispherical combustion chamber or 'hemi' head.
Look at how reflective and shiny the head is.
Here is a peek into the large, square exhaust port.
Factory hone marks are still present on the cylinder walls, and once the
carbon was removed from the top of the bore, there was almost no ridge
there. This is definately a low mileage engine, so the rings and bearings
will be left alone.
The head bolt holes were all cleaned with a flat-bottom tap.
A new stock 18RC head gasket from Checker was installed. One bolt hole is
different between the 18RC and 18RG head gaskets, and it is the one on the
front cover and doesn't really even need modifying to work. The rest of
the gaskets were 'off the shelf' 18RC gaskets.
I got air filters from a VW shop and fixed the water neck, installed it in the
car and autocrossed a bit, and drag raced. The engine would not pass an
Arizona IM-240 emissions test. Idle emissions were too high because of
the large carbs producing low intake air velocity. The air wouldn't move
fast enough to keep the fuel atomized. On a HC meter, you could adjust
the carbs so that the idle mixture was lean enough to lower the idle
speed, but it was still too rich to pass. The only way to pass the
emissions test is to be fuel injected... So this engine came out and I
built a beefy 22R with fuel injection, turbo and intercooler. Celica
Thanks for looking
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