wrench Posted October 1, 2009 Report Posted October 1, 2009 Hey all, got a real nice and healthy 4k-c 4 speed, which sits in a late ke38. Was thinking of puting a 18R in it, but i've been told its a lot of mucking around for little reward. I was also considering the 2t conversion but its only 13kw up on the 4k to begin with, so that sounds like a waste of time to me. Anywho, as i stated, my 4k-c is in very good condition so i thought why not mod it. The 4k is rated at 45kw on most sites, so i was wondering what the following mods will fetch me: Stage 3 cam, double valve springs, mild port job, extractors and 2 inch exhaust and a set of twin 1.5 inch SU's. What kinda kw's at the fly can i expect... approx??? Quote
Evan G Posted October 1, 2009 Report Posted October 1, 2009 Hey all, got a real nice and healthy 4k-c 4 speed, which sits in a late ke38. Was thinking of puting a 18R in it, but i've been told its a lot of mucking around for little reward. I was also considering the 2t conversion but its only 13kw up on the 4k to begin with, so that sounds like a waste of time to me.Anywho, as i stated, my 4k-c is in very good condition so i thought why not mod it. The 4k is rated at 45kw on most sites, so i was wondering what the following mods will fetch me: Stage 3 cam, double valve springs, mild port job, extractors and 2 inch exhaust and a set of twin 1.5 inch SU's. What kinda kw's at the fly can i expect... approx??? 45kw? pffftt tell them there dreaming, i got 30kw from a 4k with 128,000km on the clock Quote
irokin Posted October 1, 2009 Report Posted October 1, 2009 45kw? pffftt tell them there dreaming, i got 30kw from a 4k with 128,000km on the clock Factory quoted 58BHP roughly equals 44kW. Remember BHP does not equal wheel HP. Quote
Redwarf Posted October 1, 2009 Report Posted October 1, 2009 (edited) Hey all, got a real nice and healthy 4k-c 4 speed, which sits in a late ke38. Was thinking of puting a 18R in it, but i've been told its a lot of mucking around for little reward. I was also considering the 2t conversion but its only 13kw up on the 4k to begin with, so that sounds like a waste of time to me.Anywho, as i stated, my 4k-c is in very good condition so i thought why not mod it. The 4k is rated at 45kw on most sites, so i was wondering what the following mods will fetch me: Stage 3 cam, double valve springs, mild port job, extractors and 2 inch exhaust and a set of twin 1.5 inch SU's. What kinda kw's at the fly can i expect... approx??? Okay. A few questions. What is a stage 3 cam? Without specs we really can't give you an idea, as we don't know ourselves. Double valves srpings: The trick here is to match your valve spring with your cam. My all-singing all-dancing 3K had single valve springs from a 202 blue motor. All the rest of the things sound good, but bear in mind if you don't dyno the SU's by someone competent, it's all going to be a waste of time. To give you an idea of what's achieveable, my NA 3K got about 110 at the fly. You'd be looking 80-90 at a a rough guess. Edited October 1, 2009 by Redwarf Quote
Redwarf Posted October 1, 2009 Report Posted October 1, 2009 Dear God, no. I'm old. I only do Hp. Quote
Evan G Posted October 1, 2009 Report Posted October 1, 2009 Dear God, no. I'm old. I only do Hp. gonna say you had me stunned for a bit, get with the timeessss mannn hp = kw, psi = kpa :) Quote
SLO-030 Posted October 1, 2009 Report Posted October 1, 2009 gonna say you had me stunned for a bit, get with the timeessss mannn hp = kw, psi = kpa :( Still, 80kw ish out of an NA 1200 is still good work. and some people still prefer to use the old money :) Quote
kiahn Posted October 1, 2009 Report Posted October 1, 2009 all of that would probably get you around 80kw at the flywheel, if you balance it to rev to 9000 then you will be able to get more out of the cams, get the carbies dyno tuned and refresh the gearbox and diff and you could squeeze a little extra out. Quote
wrench Posted October 1, 2009 Author Report Posted October 1, 2009 I was reading something about a stage 3 cam with 280 deg duration if that makes any sense. I usually buy a cam recommended for a particular setup, involves ringing the manufacturer or dealer up to ask which cam is right for my application. I'm not fully clued up on the whole duration and degrees things works. I'm all for suggestions and explainations... Yeah i'm aware of the "45kw" at the fly, not at the wheels lol. and the 0Nm of torque they don't have lol. Blue 202 valve springs, interesting.. need machining i'd imagine??? I was just going to buy some crow jobs but i'm all for a cheaper alternative. Was also considering electronic ignition... 100hp out of a 4k would be fair screaming id imagine, 100hp @9000rpm lol Quote
altezzaclub Posted October 1, 2009 Report Posted October 1, 2009 (edited) Well, try this page for size- http://www.tighecams.com.au/cars.htm Don't forget altitude affects cams too, so at Bathurst you need more lift and less duration than at sea level. Rob here in Orange runs a cam/twin 1.5" SUs and an exhaust. He should have some advice for you. I'm fitting 1.25" SUs and a milder cam for just road use. I want more under 5000rpm. Don't forget to lighten the flywheel, and if you're really keen you can get the crank weights shaved as well. Edited October 1, 2009 by altezzaclub Quote
philbey Posted October 2, 2009 Report Posted October 2, 2009 I've spoken to a few racers running 3ks and they semm to be getting up as far as 140hp at the fly. My fresh built, twin dellorto 5K was 48kw at the wheels when I went into the Dyno shop, and 68kw at the wheels when it came out, with some minor mods to jetting and a tuneup. Definitely get it dyno tuned. And just because I like arguments, lightened flywheels won't see any gains on the dyno. Quote
Boost+k Posted October 2, 2009 Report Posted October 2, 2009 I'm not a fan of light flywheels.... the other thing you havent mentioned is compression ratio, you'll need to bump it up to get the most out of a big cam also i would run a single weber over two SU's Quote
anastasios Posted October 2, 2009 Report Posted October 2, 2009 wouldnt it also depend what you would like to use the engine for? Quote
wrench Posted October 2, 2009 Author Report Posted October 2, 2009 I'm not a fan of light flywheels.... the other thing you havent mentioned is compression ratio, you'll need to bump it up to get the most out of a big cam also i would run a single weber over two SU's I thought u'd get better results from twin su's ? I got a mate who has a pile of those 32/36 DGV webers or what ever you call them, he stock piles escorts and doesn't really use the 32/36, he prefers twin su's as i do. Yeah shave the hell out of the head should bump it up a bit, bugger rebuilding the bottom end. The whole lightened flywheel debate... in my experience those who have torque don't worry about it, those who don't do lol. I suppose we are talking K series motors here, sort of torquely challenged lol. The way i see it anyway why screw around with the fly wheel when you could spend that time looking for more power/torque elsewhere. Quote
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