Ka Question

rb_reds13 said:
Ya...If my freind dropped it in his 88trans am and runs 12's. A gutted 240 will probably do...11's...
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well i wont doubt you. but remember you automatically run good times because you have assloads of powers. there are more factors than just a light car and a big motor. if you go to moroso you'll see 400hp gtos run 14.5. its a combination of power, weight, tires, temp ,tires..and most of all DRIVER. the 240 with an ls1 and a ok driver can run consistent low 13s high 12s.. SilviaV8.com
 
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rb_reds13 said:
Just because something has a longer stroke doesn't mean it's any worse. Just like you stated.
It probably can't handle 9k rpms like the shorter stroke motors could but it has a better torque curve to balance it out.
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It does matter when you have a half counterweighted crank. The longer stroke puts more stress on the crank. If the crank were fully counterweighted, it wouldn't matter as much. No, it definitely cannot handle 9k rpms. Or 8k rpms for that matter. Don't assume long stroke is the only piece to the puzzle here. The crank plays a big role too.

You want to talk about tq curve?

Here's my old SR (stock block - still kicking ass in Finland making over 400whp now btw - OH and that's been drifting hard, not pussy behind publix shit). Notice when the tq curve goes flat and when it stops. Basically from just after 4k until right before 8k when we shut it down. And that was with a pretty small compressor (gt3071r).
17psigoodontopuq8.jpg
 
soo question do u have any experience in drifting? bt in conclusion either you build the ka for boost.. or go sr .... or keep the ka stock. while you get enough $$ for the SR.
 
The crank plays a big role too.
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I didn't know it's only half counterweighted. That sucks but it doesn't mean it will blow...Just another reason to build a ka before boostin it...Ls1 baby...Solves all problems.
OH and that's been drifting hard, not pussy behind publix shit
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Drifting behind publix= ftl, even tho I used to do it in the rain cause my sohc only has like 25 hp.
 
rb_reds13 said:
Just because something has a longer stroke doesn't mean it's any worse. Just like you stated.
It probably can't handle 9k rpms like the shorter stroke motors could but it has a better torque curve to balance it out. I loved my ka, I just didn't want a high millage motor, I also didn't feel like rebuilding either. There is no "better" engine. They are all good. Just buy an ls1 and be over it, can't talk shit about an ls1......
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very true...

boost a v8, game over.
 
rb_reds13 said:
I didn't know it's only half counterweighted. That sucks but it doesn't mean it will blow...Just another reason to build a ka before boostin it.
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I never said that means it will blow. And I've yet to see a KA build utilizing a fully counterweighted crank, although I must admit I don't keep on the up-and-up w/ ka's. They do exist but cost $2000+ IIRC. That's hefty build considering the block would need machining as well.
 
Even more reason to swap an ls. For all that trouble, just drop in an ls. It's a pain in the ass but it sure does pay off. Could you tell I really want to do an ls swap? Im 2 broke, and I live in a townhouse w/o a garage... :mad:
 
rb_reds13 said:
Even more reason to swap an ls. For all that trouble, just drop in an ls. It's a pain in the ass but it sure does pay off. Could you tell I really want to do an ls swap? Im 2 broke, and I live in a townhouse w/o a garage... :mad:
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sell me the rb... haha
 
MiaS13 said:
well i wont doubt you. but remember you automatically run good times because you have assloads of powers. there are more factors than just a light car and a big motor. if you go to moroso you'll see 400hp gtos run 14.5. its a combination of power, weight, tires, temp ,tires..and most of all DRIVER. the 240 with an ls1 and a ok driver can run consistent low 13s high 12s.. SilviaV8.com
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those are some shitty fucking drivers considering stock camaros have gone high 12s all day long for years now, LS6 vettes have gone 11.9 with just drag radials. If you are hitting 12.9s in a car thats 500 lbs lighter, well theres something wrong. I went for a ride in Matt Chins LS1 car. Hes made 420 rwhp, that was some hauling ass for a little old s13
 
My friend has an 01 trans am. He ran a 11.64 with cam/ stall converter. And drag radials...It shouldnt take too much to propel an s-chassis into the 11's I'm sure.
 
Umm, just to touch on a stray detail dealing with the ka 1\2 counter weighted crank shaft. Its a steel crank shaft with strait through bored and beveled oil galleys on the main and rod journals and its counter weights are not beyond the radius of the rod journals. I do not believe that single "flaw" is holds enough merit to mention as a disadvantage on the ka side. I will also mention that ive never ever heard of a crank shaft snapping or failure due to cracking.

umm yea, piston speeds at 7300 rpm are like 5400 fps with a 96mm stroke. So I tossed out my high revving ka idea along time ago.

I would have to see a sr20 with the oil pan off with the pistons in the middle of their stroke to draw a conclusion. I might be able to provide numbers to back my argument if I were able to weigh the crank shaft. But has anyone thought that there might be a space constraint only allowing nissan to use 2 counter weights instead of 1? If youd like to throw sand, id rather only have 1 counter weight splash through my oil bath instead of 2. dun dun dun. Bring me pics please.

your sr20 head might boast a shallower valve seat angle, but have you looked at how strait the intake and exhaust ports are in comparison to the angle of the valve seat? Im working on a s13 sr20 cylinder head right now and well, ill be able to compare modified cylinder ports on the ka and sr20. Im interested to see the results myself, ill provide pictures.
 
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Tonymac said:
I'm just tossin fuel.
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i got the lighter !!! hahahaha


dont turbo a stock engine kiddies, shit will blow up if you drive it seriously. There is enough carbon on those pistons and the combustion chamber to heat up and knock uncontrollably. Which is kinda the scary part about turbo charging and engine with miles on it. yes i know all engines have carbon deposits but ive cracked pistons before i speckled the spark plugs from light detonation.

I mean come on, its only .160" thick land that holds the top compression ring in place on the combustion stroke, especially with a bore that large, shits weak!!!!!!
 
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