What kind of street performance power can I get out from a L20B engine? L20B is a 4 cyl engine, OHC, for those who do not know it, it fairly common, and it was a racy engine for what I've been told. With a dual sidedraft set up, headers and a cam, would it be a powerhouse? I know there are limitations, I do not mean it to be the fastest engine on earth, but would it be a good motor?
Comments are appreciated, I need some points of view.
Jaime

A stock one is good for around 110hp & 110 torque. A good street cam and a 32/36 Weber or dual SU's would be good for another 10-15hp and better bottom end. Dual sidedrafts would get you 10hp and more top-end (less bottom-end). The best way to build a street one (IMO) is to bore it .080 over and use the crank, rods, and pistons from a Z22. This will give you an L22. With a good cam (the DAMB cam is the best), dual SU's or sidedrafts you can expect around 150hp+ with ALOT of torque.

I have a mostly stock L20B in my 510 right now with a Weber 38/38 DGAS carb. As soon as I get a chance I'm going to dyno it to get some baseline numbers. I'll post them here when I do.

ive been hearing that the L18 is a better motor than the 2ltr, i think it had something to do with the crank in the 2ltr. but i dont know any detail, just suggesting you talk to someone with experience in both motors and find out what the story is

Hy tens & 20's. Thanks for your response. I got a 610 with a L20 engine, and as far as I've been told , it is a very torquey engine. That is good for street use. Perhaps I will work this engine,cheaper than a swap, and, as far as the L18 being better, perhaps it is posible, I do not really know, but maybee the L18 is less torquey and more high end HP . Reality is I have a L20B and if I can have a competitive street engine out of it, that would be great. I will show pics soon, as I get some.
Jaime

Hey Ralliecar, is your engine stock w/ the twin DCOE's or is it tricked? I am dying to install a set up like that, but my engine is stock.
Jaime

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It generally has alot more torque than the L16/L18 and a bit less top end. A perfect street engine, but the smaller motors might be better suited to racing.
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L18's are not any better really, just different. The L16/L18's tend to rev smoother and higher, but the L20B seems to have ALOT more torque, as stated. An L18 is the best way to go if you want to turbocharge it or race it, IMO.

My 510 currently has an L20B, but will probably get a KA24E somewhere down the road. You wanna talk about TORQUE? Plus, I can just about do that swap blindfolded.

my motor is pretty worked, i bought the motor with carbs already worked and didnt get a lot of info on it, i do know its got a huge cam and been bored 40thou, it also has a gx head but i dont really know much more than that for sure

it was dynoed at some stage, i dont really know in what state the motor was or conditions it was done but it made 56kw at rear wheels which i figure is about 100 flywheel hp

Talking about my 610, I am trying to think about working the L20,because a friend of mine says that an FJ20 would fit in nicely, would the FJ 20 be a good choice? The FJ20 is more comparable to the SR20 if I am not wrong. Never owned any of these engines, so this is discovery time for me. Would you compare a KA24 to a FJ20,performancewise? Your 510 must run like a rocket on that L20 . Is your L20 tricked?
Jaime

The L20B is not really a performance engine.
The SU carby equipped L18 was in both 510 SSS and 610 SSS models.

When building up an L20B engine, many people prefer to use the L18 head because of the kidney shaped combustion chamber, which is good for performance.

If you just want a little more performance, then it would be fine, but I'm almost certain that it won't fit in the 1200 as it's additional 100mm in height (taller than the L16 and L18) makes it a harder fit, even in a 1600 (510).

Chris

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Well, the FJ20 is much older, though. I would think of it more as a twin-cam Z20E. If I recall correctly, the FJ20 is not a 16 valve, it just has dual overhead cams.I don't think it would be a good choice just because they never sold it here in the US. Getting parts for it would not be easy.

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The KA24E would have ALOT more torque, and comparing stock engine to stock engine it would have more horsepower too. Plus it's easy to get both stock and hot-rod parts for the KA here in the US.

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Yeah.... but not like the KA did....