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Old 04-04-2002, 08:05 AM   #1
hobun2
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Question Cams for 1.8

I know I ask too many questions. Here's one more for today.

Is it worthwhile to install cams for a 1.8l? Actually, IS THERE anybody who makes cams for 1.8l's? I've read many posts on this subject, but I haven't found anything which would prove:

- cams exist for the 1.8l;
- they can help improve the HP/TQ of a 1.8l;

I'm not much of a specialist especially when it comes to a subie, but I'm thinking whether there are any adjustments I can make to my car with its current stock setup (EJ-18 FWD, no intake and exhaust mods yet).

Thanks in advance for any advice!
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Old 04-05-2002, 02:48 AM   #2
Kostamojen
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I dont think we have any cams But I have heard our block is the same as the 2.0 block, but the 2.0 is just bored out... not 100% sure if thats true though...
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Old 04-05-2002, 11:49 AM   #3
hobun2
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I heard that too from a mechanic too. However, I guess many engine components don't necessarily match because of that...
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Old 04-06-2002, 07:01 AM   #4
tonytiger
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The EJ20 is a bored EJ18. I actually contacted a tuning shop which works on rally Subies and they said the cams could match eachothers.
The problem is the shop only works on turbo engined with quad cam engines, so they couldn't offer me solution. I believe if you have at your whereabouts SOHC EJ20's more aggressive cams they should fit.
I'm not sure would the cams from EJ22 fit. It has only a different bore compared to EJ18 and EJ20. You can check the specs
here

Good luck and post here if something comes up



tony
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Old 04-07-2002, 01:47 AM   #5
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Thats cool... Is the 1.8 semi-closed like the 2.0 as well?
It would be an interesting experiment to keep the 1.8 block and toss the rest of the WRX parts (headers, turbo, etc.) onto the block since they would fit and see how it would run
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Old 04-07-2002, 11:45 PM   #6
hobun2
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tonytiger - I'm gonna check a few scrap yards this week-end and see what they have!

Kostamojen - I've been thinking about doing something similar. Since I don't have the money to invest on an engine swap, I'm also considering swapping certain parts of the engine from other EJ's. This might be the key to increase the power with a smaller budget...

I wonder if the engine head, intake manifold, throttle bodies from other engines would fit bolt-on and help the engine breath better. What do you guys think. Anybody ever did such a thing?
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Old 04-07-2002, 11:48 PM   #7
hobun2
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Default French?

Hi tonytiger! Since you're from Finland, I wonder if you speak French? I regularly call France and other European countries at work...

If so, merci pour tes commentaires!
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Old 04-16-2002, 11:05 AM   #8
tonytiger
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Smile

You're welcome, even though I don't speak French We speak Finnish in Finland.

Sorry but I don't know what the semi-closed means, dumb me.

Heads shouldn't fit since the bore is different wich to my knowledge means that the combustion chamber is too big for EJ18.

Intake manifold probaply won't fit either due the same reason.

Throttle body might fit - probaply won't help much.

If you have monopoint fuel injection, swiching to multipoint should be the thing to do. I hardly believe that you have monopoint though.

I believe that the bigger EJs have bigger valves. They'll probaply will fit a hopefully will give a good increase in power. Also modifying the valves' plates would help a bit.


Attaching the WRX parts or some turbo system to our engine probaply won't be impossple but, here where I live registering the car is more difficult than the modification. The emissions have to be measured in an very expensive way (about 1000 USD) for example.

Might forgot something



tony
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Old 04-17-2002, 05:39 AM   #9
hobun2
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Tonytiger - thanks.

BTW, "merci pour tes commentaires!" means "Thank you for your suggestions".

I see that there aren't too many things I can do unless I take a section of the engine apart. I was told by my friend I can also change the head gasket to a thinner one to increase the output. However, the downside is that I'm risking decreasing the lifespan of the engine.

I believe this has something to do with the compression ratio. From what I remember, I have 9.5:1. The gasket is made in aluminium.

I'm not sure if I should go that way since my engine already has 188,000km ~ 115,000 miles.

Also, playing aroung with the transmission's ratio is an option. However, I didn't understand what he meant...
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Old 04-17-2002, 06:03 AM   #10
tonytiger
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Cool

Replacing the gasket to thinner one will increase the compression ratio and that will affect postively on power. However it's not as simple as it sounds.

The problem is the gasoline will eventually self explode by the pressure the piston creates. This is known as the knocking or pinging I think. The lifespan will probaply decrease because of that.

To avoid pinging the timing is usually changed, but in our case the timing is controlled by computer and we can't affect it.

Higher octane gasoline can take more pressure before it exxplodes by itself.

If you wan't to know more, read The fysics: compression ratio? How does it affect? .

Probaply changing the gasget won't cause pinging and could be a good mod. It's just where to find the gasget


Changing gear ratios to thicker will help you to keep on the desired power band. In our cars itäs around the 6000RPM where the maximum power is. You can speed to low speeds good with the thick gears - on the other hand it will affect fuel consumption on travel driving since the 5th gear is smaller and the angine runs higher RPMS at the travel speed.

Not a bad thing to do but will probaply cost little too much. The final gear can also be changed which will change the "ratio" of all gears since it is used no matter what gear is engaged.

You can mesure the effects by this Gear calculator .

Might forgot something.

Thanks for the French lesson

tony
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Old 04-17-2002, 06:51 AM   #11
hobun2
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Wow! That was a lot of technical info! Thank you my friend! (again)

I'm gonna need some time to understand all of it since I'm not that good with technical stiff. However, I was quite interested regarding the part about octane levels. I put 94 octane all the time and I'm beginning to think it's just too high. However, I noticed it gives me a better gas mileage.

Thank you again for the info! It was a very kind gesture!

And if you need French translation, I'm available at all times!
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Old 04-17-2002, 07:35 AM   #12
XT6Wagon
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In america, I believe the EJ-22T is the only motor to get a closed deck block in the EJ series.

And I'd still take a pase II EJ-25 block over it.
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Old 04-18-2002, 01:50 AM   #13
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Quote:
Originally posted by XT6Wagon
In america, I believe the EJ-22T is the only motor to get a closed deck block in the EJ series.

And I'd still take a pase II EJ-25 block over it.
I thought the EJ20 was semi-closed? Thats why I was wondering if the EJ18 was semi-closed as well since its a simular block...
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Old 04-18-2002, 05:00 AM   #14
XT6Wagon
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Only the STi EJ-20 block is what I would call semi-closed deck.
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Old 04-18-2002, 06:08 AM   #15
hobun2
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From wht I know, a closed deck would provide the engine a high level of durability in case of adding a turbo. Am I correct?
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