JP521 Posted June 25, 2011 Report Share Posted June 25, 2011 Hi everyone, someone tried to get more strength of a J13, tell me what can be modify???. To start. I increse the range of valve opening, now i was thinking to place iridium spark plugs. This will damage the engine??? Quote Link to comment
Master-O-Turbonics Posted June 25, 2011 Report Share Posted June 25, 2011 L20B swap. :-) Quote Link to comment
datzenmike Posted June 25, 2011 Report Share Posted June 25, 2011 If he had an L16... yes, but swapping an L20B into the J13 place requires cutting to old mounting location off and adding something for the L series to mount to. Assuming there are any Ls around. Central America used J15s I believe. Quote Link to comment
ggzilla Posted June 25, 2011 Report Share Posted June 25, 2011 J13 -- you can gain perhaps 5 HP. To get more it is easier and less expensive to swap in a better engine. Putting an similar-sized A14 in will give you 10 HP more. L16 will give you 25 HP more. I increse the range of valve opening Yes, that may damage the engine long term, the valves & rocker will wear if you have the lash much looser than stock. now i was thinking to place iridium spark plugs You won't gain any HP from this. Brand new regular plugs will do the same as Iridium. Iridium will last longer. Or just use regular plugs and re-gap them every 12 months. Iridium needs no re-gapping. Quote Link to comment
MikeRL411 Posted June 25, 2011 Report Share Posted June 25, 2011 A long shot but, the Japanese domestic market had a PL411SS [sS Sport Sedan, not the SSS Super Sport Sedan] and PL411SW Sport Wagon that had a J13 with twin Hitachi SU carburetors, like the MG. It might help but I don't know any Horsepower or Torque number to give you. Quote Link to comment
wayno Posted June 25, 2011 Report Share Posted June 25, 2011 Hi everyone, someone tried to get more strength of a J13, tell me what can be modify???. To start. I increse the range of valve opening, now i was thinking to place iridium spark plugs. This will damage the engine??? If your looking for a big differance, you will have to put a differant engine in the truck, there is not much out there performance wise for the J13. Quote Link to comment
king bee66 Posted June 25, 2011 Report Share Posted June 25, 2011 mexico had L motors in their 620's i believe, unsure of south america though Quote Link to comment
JP521 Posted June 25, 2011 Author Report Share Posted June 25, 2011 A engine swap will be a great improve but in my country the A14, L16 and L20 start to desapere jajajajajaja and is hard to find a complete good engine of those. Thanks for the advices!!! Quote Link to comment
ggzilla Posted June 26, 2011 Report Share Posted June 26, 2011 Mexico had J18s... which might be the easiest upgrade for a J13, if you can find one. Quote Link to comment
zenndog Posted June 26, 2011 Report Share Posted June 26, 2011 How about a small turbo charger off a motorcycle? Doubt iridium spark plugs will damage the engine, how about a Pertronix electronic ignition. I think there is a Pertronix available for the J13, plus a flamethrower coil. Can't hurt if you can get them in Bolivia. We are used to having choices but that doesn't mean that someone can't squeeze some power out of a J13 if that is all they have. Isn't it possible that there might be some performance parts for MG's that might fit on a J13 engine. Here is a thread on a guy building a MG Midget for Bonneville speed trials, might give some inspiration and maybe some ideas. Quote Link to comment
wayno Posted June 26, 2011 Report Share Posted June 26, 2011 It more than likely would be easier to put a set of motorcycle carbs on his J13, he would have to fab an intake manifold, but other guys have done that here on ratsun in this thread. http://community.ratsun.net/topic/31186-dual-sus-on-a-a15/ I would think this is your most likely direction if you want more power out of your J13. Quote Link to comment
ggzilla Posted June 26, 2011 Report Share Posted June 26, 2011 Pertronix won't add any HP (not any more than new points & plugs would). It will add reliability, it is definitely worth doing. Turbo is actually a good idea. Definitely would give a HP boost. Keep it to 5 psi and the J13 could probably handle it with no loss of relibility and you wouldn't even need an intercooler. Just make sure to re-torque the head bolts before you add the turbo. Quote Link to comment
zenndog Posted June 26, 2011 Report Share Posted June 26, 2011 How about some pics JP? Quote Link to comment
JP521 Posted July 1, 2011 Author Report Share Posted July 1, 2011 A small turbo??? No. I'm a fan of N/A engines (except for the SR20DET jejeje) but a twin carb of a A14 is a great idea!!!. A series engine share some parts with the J series, right??? Intake headers will be shared???. Pics yeah, soon i´ll start a project topic!!! Quote Link to comment
wayno Posted July 2, 2011 Report Share Posted July 2, 2011 The A and J blocks don't share intake or exhaust manifolds, they are differant bolt patterns and the J block #2 and 3 cylinders share an exhaust outlet in the head, and also #1 and 2 share an intake hole, 3 and 4 also share an intake hole, the A block, everything has its own hole or tube. Quote Link to comment
BillM Posted July 2, 2011 Report Share Posted July 2, 2011 The J15 can take any of the carburation & manifolds from the MGB and I would guess that the J13 would be the same. Could be an improvement there. Head is a direct swap but be wary of the big valves hitting the edge of the small cylinders. Engine is a direct swap too. BillM Quote Link to comment
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