GSXR SJ413

[ShuDuck]

her er litt info klippet herifra :
http://bbs.zuwharrie.com/content/topic,82730.90.html



<!--quoteo-->QUOTE<!--quotec-->Sooooooooo, I got some more info. I will get the dyno sheets up and going hopefully today as I'm running into a bit of technical difficulty with the dyno computer. I will also get some pics and whatnot up as soon as I find the dang cable for my camera.

So here is the goods.
the factory intake manifold and exhaust manifold were engineered to not work. That is the only possible explination I can come up with. Someone had to try and suck this bad.
I built a solid run of the mill 1.3 its specs are

1.3 standard bore
flat tops
.010" 1.6 head
.045" head gasket
I used the tnt camshaft
this engine spec'd out to 9.0 CR as the potential owner wanted to be able to run crap gas. (not my choice, run premium and build the motor to use it and all is better)
The truck had a 2" exhaust and a electric fuel pump at 3.5 PSI
It ran a stock distributor at 10*
In the passed I have clipped off between 55 and 60 whp depending on tires and whatnot with this recipe given a good carb/manifold and header. For the sake of testing I ran a factory 1.3 exhaust manifold and factory carb and intake.
I ended up makeing a whopping 40 hp. Wich is very close to the factory output. Swapping out to a known properly jetted weber and a good calmini header brought HP up to 52. Recurving the distributor to get 34* got me 55hp. wich is about what this setup really should run.
So while this recipe is worth about a 30% hp improvement, you really need the good intake and header to make it work.

Running my first prototype intake manifold on this same engine with less than ideal jetting netted me 71 HP and 64 foot pounds. this is with the short runner and the 32mm carbs.
So looking at it this way, we see an improvement of almost 100% over a factory 1.3 engine at the tires. Anytime you can double the output of a motor you gotta wonder what the engineers were doing all day at work.<!--QuoteEnd--><!--QuoteEEnd-->