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Old 09-06-2011, 09:16 AM   #1 (permalink)
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Default SJ413 engine mod/swap

Hi, people.

Before I go any further, I have a nervous system disorder which severly limits my earning abilities, so I (very slowly) build all my own parts. Buying in off-the-shelf solutions really isn't an option.

Anyhow...

I've got an offroad only SJ413 which I've been slowly modifying. It's got the 1298cc G13B in it, and I'm concidering a G16, and/or bike carbs.

I'm leaning towards buying a 1.6, and while it's out of the car do a full rebuild - perhaps porting and polishing the heads, making the intake manifolds for bike carbs etc - then drop the engine in and tune it up a little.

I've already swapped out the original G13A for a G13B (the original engine smoked like crazy, and I damaged the head whilst removing gasket residue during a rebuild - DOH!) so the thought of swapping in a G16A doesn't daunt me at all. It's got a homebrew side-draught carb setup (SU HIF44 clone).

With the engine up high, swapping in a heavier engine is a no-no (asking for trouble when I'm regularly at about 45 degrees with 6 inches of lift).

However, I really would like more than an extra 20ish ft-lb of torque. HP doesn't bother me all that much (like I said, it's an offroader - HP isn't *nearly* as important as torque) so the 75ish of an 8v is probably fine.

The engine will probably only power the car for a couple of thousand miles in the rest of it's lifetime, but they'll be relatively hard miles - 4 lo, often at high revs for short bursts. *ALL* offroad (in mud, shock loads won't be too high).

So my questions to you lot are:

1) Are a set of bike carbs going to react ok to the strange angles that my SJ spends a lot of its time at?

2) What kind of power increase am I likely to see (being conservative) from bike carbs on a 1.3?

3) and 1.6?

My goal is to eventually have a 120ft-lb engine. That may be unrealistic, but hey - a man can dream!
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Old 09-08-2011, 12:05 AM   #2 (permalink)
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J20(2.0) VITARA ENGINE would satisfy your power goals.
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Old 09-08-2011, 08:06 AM   #3 (permalink)
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Quote:
Originally Posted by HOARDER View Post
J20(2.0) VITARA ENGINE would satisfy your power goals.
How heavy is the J20? I thought about it for a while, but I was told it is significantly heavier than the G13 or G16.

I'm also not sure I can get one for anywhere near the money of a G16...

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Old 09-08-2011, 02:37 PM   #4 (permalink)
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What about using a G16 block with the G13B top end as you already have it set up. That will give a big torque boost without loosing power.
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Old 09-09-2011, 09:06 AM   #5 (permalink)
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What about using a G16 block with the G13B top end as you already have it set up. That will give a big torque boost without loosing power.
Wouldn't that be similar to just dropping the G16 16v engine in? I may be wrong (going by info taken from wikipedia here, which is about as reliable as a french built car these days) but aren't the 8v and 16v G16's almost identical from a torque point of view? I thought they both had roughly 90ft-lb. It's the HP that differs (75ish for the 8v, 90 for the 16, if memory serves).

Would the G13B head really offer me more torque over the standard G16 head? Money's tight, so I was planning on reconditioning the G13 and ebaying it off when the new engine was in and the carbs tuned.

Thanks for the info thusfar people!
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Old 09-09-2011, 09:55 AM   #6 (permalink)
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If you just drop the G16B in then you need to either fit EFI or adapt a carb and inlet manifold to fit also you need to adapt a distributor becuase the dizzy on the G16B engine rotates the opposite way to the G16A and G13 SOHC engines. The G16B bottom end would give you a big torque increase over what you have now without having to swap intake and exhaust systems.
Only you can decide which would be cheaper
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Old 09-09-2011, 01:30 PM   #7 (permalink)
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Originally Posted by Rhinoman View Post
The G16B bottom end would give you a big torque increase over what you have now without having to swap intake and exhaust systems.
The current exhaust is part original, part flexi exhaust tubing. Whatever I decide to do, a new exhaust is probably a good idea.

As for the intake, I was planning on fabbing a whole new one anyway. A manifold that splits my current homebrew snorkel intake 4 ways for the 4 bike carbs was the original plan, so fabbing up a whole new intake isn't an issue. It's just likely to take time.

And I'm fairly patient!

So, does anyone know if the bike carbs would be happy at funny angles, or should I keep the SU?

Either way, I'm looking at similar amounts of work, I think.

I should add that making this stuff is part of the fun for me, so as long as it's not horribly complicated, I'm up for it.

EFI and the associated wiring aren't fun for me though, which is why I havn't even considered bike throttle bodies. I'd have to make a whole bespoke system (megasquirt?) so I understood it properly - wiring looms just give me the heebiejeebies. Plus, there's no monee for that.

I mean, if I found that a J20 was lighter than I'd been led to believe, if I *did* install one, it'd have to be converted to mechanical ignition and carbs. I just don't get along with ECU's (which is weird for a guy who used to be an IT guy...).

Does anyone know where I can find out what the various blocks actually *do* weigh? Info on the intertubes is contradictory and *sparse*.
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