up the power on the 18r

[Spanner]

Is NOS even an option??

[hosking1991]

Is NOS even an option??

could imagine the damage that would do

just brought a electronic dizzy for my 18rc so once blue slips done i am putting my extractors back on and my weber oh and my lumpy cam sounds pretty awesome makes the car sound fast

[hosking1991]

got a vid of the lumpy cam idleing
http://s96.photobucket.com/albums/l1...t=P5240015.flv

[Spanner]

GO the Stage 2 cam it works wonders, flys like a rocket.
(for a tonne of steel 4WD)

[hosking1991]

ive got a spare cam in my garage (stock) how much wood it cost to get it reground to stage 2 specs?

[Spanner]

it cost me 230 for the reground cam plus $ time to put it in, i had a fair bit of work done so it kept the cost down a bit made all the differance.
there are 3 types you can purchuse 1 stock, 2 moderate, 3 hot all cost the same but with stage 3 (hot) you need to do other work to the head before you can run this type of cam.

[clubagreenie]

im looking at the cheapest way to gain some power.

Run for PM. It's cheaper than getting power out of an 18R

[mikie]

Run for PM. It's cheaper than getting power out of an 18R

ha ha ha. i was rolling in tears, but only coz it true. save your pennies till you can replace the motor with something that is worh spending money on. 18r is poo (unless it has a "G")

cheers
mike

[timbosaurus]

save your pennies till you can replace the motor with something that is worh spending money on. 18r is poo (unless it has a "G")

Yeah, in this situation it is true. But some of us sad cases have a soft spot for the old single cammer, and the reliability it shows when maintained

[MWP]

got a vid of the lumpy cam idleing
http://s96.photobucket.com/albums/l1...t=P5240015.flv

Click click click click click click click click click.

The sound that every 18R owner knows so well

[mikie]

don’t get me wrong nothing else sounds like a 18r, i am the proud owner of 2 1/2 18r-c and out of them i can't seem to make one reliable engine.
and if your looking to up the power on it, that is like flogging a dying horse. spend the money on getting the motor rebuilt, at least partially, so that it can run care free for the next 300k.
when i first turned 18 i spent close on 3k, to increase the comp, replaced the carb, put in a mild cam, extractors. and the performance benefit for the money spent was totally not worth it.

my 2c

cheers mike

[kylestyleup]

Hello all...

I am also planing to have more horses to my 18R.
I have here a list... will they work to add HP?

- Twin Weber 48
- Port & Polish
- 94mm 22R pistos
- 3" headers

Also, is it possible to get a 10 psi compression ratio from this SOHC?

[thechuckster]

headers seem rather large big in diameter - just match the diameter of the exhaust ports or go 1/4" larger.

what shape is the 22R piston crown? the combustion chamber of the 18R is wedge-shaped so picton to has to suit.

[timbosaurus]

Hello all...

I am also planing to have more horses to my 18R.
I have here a list... will they work to add HP?

Also, is it possible to get a 10 psi compression ratio from this SOHC?

Alrighties... Yes, the mods listed will certainly add HP to the old 18R.

The work and money required to do the work would probably be equivalent to an engine conversion over here in Australia, or maybe even more, but the engine conversion would have a MUCH better end result. That's why you don't see many people doing this sort of work to an 18R here. But I hear that conversions aren't the easiest to get approved in the Phillippines, hence the desire to modifiy the old 18R.

The package you have listed is a start, but will need a bit more. I am also guessing that you mean a 10:1 static compression ratio, as 10psi is not much pressure.

- Twin Weber 48
- Port & Polish
Twin 48's need a lot of air flow to work well... You will have to spend a LOT of time getting the 18R head to flow that much air. You will also need to spend as much time on camshaft profiles, as the stock item will certainly not suit this sort of engine.

- 94mm 22R pistos
94mm seems a little large. stock is 87.5mm or close to it (maybe 87mm is stock and 87.5 is oversized... I can't remember), I think 22R is 92mm bore, so taking it out another 2mm to 94mm would surely be pushing the limits of the 18R block? But maybe it is possible

- 3" headers
Yeah, way too large. maybe 1.75" primaries and 2.5" pipes if you are going to run 10:1 and twin 48's, but to do it properly the exhausts really need to be tested and tuned... not just guessed.

You'll want to build your bottom end to withstand high revs (7000+rpm). Use aftermarket fasteners and grooved bearings and have it balanced properly. The first problem you will probably hit with the 18R bottom end at high rpm is oil starvation of No. 4 big end bearing (bush) when the oil pump is starved around corners.

The pistons you use will likely need to be custom made as the stock ones have a flat top and hi-comp will need domes with valve cutouts. Best to use forgies for hi rpm and hi comp running.

After this, you will bolt on your highly modded head and camshafts and you'll have yourself a nice long motor

You then use your custom extractors and you'll have to make up a custom intake manifold to suit the webers.

You would want to use a hi-energy programmable electronic ignition, or at least a re-graphed dizzy with external ignitor. and dyno time will need to be spent tuning the ignition, as well as the webers.

Use a heavy duty clutch... a heavy duty pressure plate and organic full face clutch should suffice, or use a button clutch if you so wish.

After all this, you will *possibly* have a 200hp motor. It will use a lot of fuel, need constant maintance, and possibly not last long. This is why we usually take a standard 250hp EFI, 2 litre, twin-cam turbo engine and bolt it into our celicas

Cheers,
Timbo

[glytch]

Yeah, personally spending big $ on the 18RC is not really worth it. Headers, a decent carb off a +2L (weber, holley, dellorto etc) and some machining will improve the performance a bit without needing to pull apart the engine.

Then save all your money and buy the first 18RG that comes along and bolt it in.

I have a 36/32 weber on mine along with some HM headers and have removed all the HP sapping pulleys and fans. Currently I am organising a mild cam and possibly a 48 Dollorto to give it a bit more guts whilst I plot on how to make my new engine fit.

FWIW, There are quite a few cam grinders out there who reckon a Hot cam will go in a fairly stock engine if you sort out the valve springs at the same time.

Cheers

Luke