Vin - I'm running the Biki and love it, I've not noticed any issues with mine...

Also, I'll likely never recommend I-J to anyone. Their CS is horrible, and the owner was absolutely no help. I got my parts, but waited WAY too long... I also spent 8 hours in the machine shop modifying mine.

DJ, hit me up on email, i'll shoot you his #.

AZhitman wrote:Vin - I'm running the Biki and love it, I've not noticed any issues with mine...

Also, I'll likely never recommend I-J to anyone. Their CS is horrible, and the owner was absolutely no help. I got my parts, but waited WAY too long... I also spent 8 hours in the machine shop modifying mine.

Most of the problems that I have seen with the Biki are coming from California OBD1 mother boards. I've been looking around for a fed issued ecu for around $30 dollars with no luck.

Sorry to here that I-J didn't work out for you. Kevin has always been prompt with me with his emails and ordering.... What other companies are there that make a crank scraper??????

DjPantsSpecR wrote:well, you're in luck.

we're gonna dyno test the n/a manifold on my 11.2:1 compression car. we're also going to dyno test it on a stock 240, jsut to see what baseline gains are. we're all eager to see the results.

I'm trying to imply we have to explore higher revs to compete with higher reving low output motors. You could build for as much mid range as you can, but there is always a ceiling of VE.

I dont know what the revs are on that Rebello KA i posted, but since it claims 280whp, im sure they are significant.

look at the specs " * Engine Builder: Dave Auerbach * Manufacturer: Nissan * Type: KA24 * Displacement: 2.4 liter * Induction: Twin Mikuni 44 side draft * Heads: Nissan 12 valve * Block: Nissan * Main Caps: Nissan Comp * Crankshaft: Nissan Comp * Connecting Rods: Carillo * Pistons: J&E * Camshaft: Rebello * Valves: Nissan Comp * Valve Train: Nissan Comp * Clutch: Tilton 2 disk 5 1/2 * Pressure Plate: Tilton 5 1/2 * Flywheel: Tilton 5 1/2 * Exhaust: 4-2-1 * Total Time: 1.2 hrs * Races: 1 "

this motor is obviously built for high rpm use, which is necessary for its claimed 340hp output. obviously this is for a race car, but it gives you a bit of an idea of what you need to go through to build huge N/A numbers out of these.

Especially because this is a carb'd SOHC.

Ok guys. I can't be too specific here but I'll give a few specs1. Rebello DIDN'T build this engine. Dave Auerbach did.2. SOHC KA's don't like more than 7800rpm's They tend to turn the rockers into "dust"3. Compression ratio on this engine is 14.38 to 14. 44mm Mikuni carbs with 34mm chokes on nissan comp manifolds5. Cam is .620 lift (can't tell you duration, sorry)6. Cyl head, manifolds and exhaust have MANY hours of work7. Torque is 231@5200 and HP is 281@7500 at the flywheel8. Rebuild interval is 1000 miles (running between 5200 and 7800 rev range)9. You absolutly CAN run this engine on the street. When I drive it through the paddock to the false grid, it drives like puppy! At 7800rpm's it's a bit like !

When we dynod the engine with 50mm Mikuni's and 44mm chokes we got 341HP at 8000rpm's. We figured that rebuild intervals would be about 400-500 miles at that HP and I decided to run the car in GT3 (restricted to 34mm chokes and 281hp) instead of GT2 (44mm chokes and 341hp) to try and cut down cost a bit. If you want an engine like this,...Plan on spending around $18,000Or you could buy the car and ALL my spares (2 engines,2 transmissions,2 rear axle assemblies and a TON of other stuff) for $35,000 TODAY

Mike

Good info Mike, welcome aboard!!!

p.s. Anytime you feel like whipping up an article or contributing some more of that knowledge, you know where to drop in!

Ha, thats so great! thanks so much Mike.

If I EVER wanted to be proven wrong as i often do, that was exactly what i wanted to hear.

And a streetable engine, good lord. i'd love to hear anything else you have to offer

i think i have found every N/A page on this site after about 4 weeks of research ...6 hrs a day...all sorts of reading on hotrod tricks...the size design of the ka DOHC it really was never built to be NA like many domestics are...basically 220whp is easily achieved as N/A ...but past that good luck...my set up for it would have gone somethin like this and im aware the motor would detenate about 100k miles...so what.....sohc 2.33cc pistons coat them in heat spray ...headers testpipe...catback....370cc injectors...oil cooler... koyo ....now for the hotrod tricks..thicker head gasket...copper valves as short as you can find them to fit...some serious fuel mapping and timing to be done... and a SAFC / or some sort of piggyback this would have given me (my estimate)** 215hp

Thanks for the warm reciption guys. I would like to answer any questions you guys and girls? have. Im a Datsun/Nissan fan from way back! Along with the 240SX racecar, I have a 72 PL510 Vintage racecar also. The 510 has a FIA head L20B with taper bore Mikuni 50PHH carbs, 6" Carillo's,J&E 14.25 to 1 pistons, .680 lift cam making 238Hp. Both cars are a blast to drive, but the 240SX is just an "animal" Anyway,...Please feel free to ask anything you want. I wish I knew how to post up some pictures here, but I have never figured out how to.

Here's the link to my 240SX for sale add that has a bunch of engine pictures.

http://www.race-cars.com/carsa...s.htm

Thanks again, Mike

i love that car...mike...its like a dream...to see the sohc in a late model

also another hotrod/tuner trick for n/a individual throttle bodies...help a little...but the oversquare size makes n/a a pain

I dont know what kind of power Im making but my s13 ran below a 13.5. I run on untinted 92 octane pump gas, run this on the street and do not spin over 7500rpm. why would anyone think that the dohc would do any less? btw, the power making parts on my engine did not even come close to $3000. I think we should really stop the talk about $10,000 engines and 10,000rpm. no offense guys but thats all Ive been reading for years here. I dont think 10g's and 10,000rpm is needed. peace

240ka24 wrote:I dont know what kind of power Im making but my s13 ran below a 13.5. I run on untinted 92 octane pump gas, run this on the street and do not spin over 7500rpm. why would anyone think that the dohc would do any less? btw, the power making parts on my engine did not even come close to $3000. I think we should really stop the talk about $10,000 engines and 10,000rpm. no offense guys but thats all Ive been reading for years here. I dont think 10g's and 10,000rpm is needed. peace

Mind sharing what you're running? Is your car stripped or full interior? That kind of 1/4 mile time would seem to be in the 180-200whp area (13.5 is about what a mild sr20 runs, is it not?)

Mike, seems you and I have the same "disease"...

I just "adopted" another classic this past week.

Ajax wrote:Mind sharing what you're running? Is your car stripped or full interior? That kind of 1/4 mile time would seem to be in the 180-200whp area (13.5 is about what a mild sr20 runs, is it not?)

my 240 can run a flat 14 ...high 13s w/ its bolt on no reason his numbers arent correct...its all in the driver and the motor is not meant to be reved out like some honda pos ...its oversquare...its a tq motor...similar to a camaro motor ...it gets it power from its design not how many times the crack spins..

shpaintball wrote:my 240 can run a flat 14 ...high 13s w/ its bolt on no reason his numbers arent correct...its all in the driver and the motor is not meant to be reved out like some honda pos ...its oversquare...its a tq motor...similar to a camaro motor ...it gets it power from its design not how many times the crack spins..

have you lost your mind?? not to be an a** or anything but what have you been smoking??? there is no way a 240sx, especially a SOHC with just bolt-ons can run a high 13. maybe a turbo 240 with bolt ons.

lol its not my sohc...i have 3...a black .red...white ...now my sohc runs 17's but my dohc ...w/ drive shaft....exhaust / intake ....flywheel... runs 14's...

ill try to find a time slip in my garage but the car is modified but not really past bolt ons... 14s was easy to get...

I'm gonna ignore all these "e-dragsters", because simple physics debunks them all.

Anyway, the info Mike posted was great.... The bottom line is, the DOHC KA has yet to break the elusive 200hp barrier.

In all reality if the 240sx has a KA you have to account for the chassis, engine weight, and driver weight. KA engines are one of the heaviest gasoline 4 bangers on the market so don't always think even if you have the same HP rating as a stock sr20det that the times will be equal.In all truth I've ran between a 15 flat and a 15.3 second 1/4mile and that isn't bad at all since the stock time is relatively a 16.3, I also have an extremely used VLSD that runs as an open diff. What is a major factor that most people don't account for is outside temperature and humidity( high humidity has less air more water, higher temperatures have less denser air), even the elevation where the track is located at can effect the 1/4 mile time. (higher elevation= less air density). I've noticed this watching a lot of good drivers running boost on subaru's, nissan's, toyota's,mitsubishi's and chevy cobalts getting worse times than the stock times listed in road and track....If the chassis has all new bushings, and you happen to run VLSD for added grip a 14.9 second 1/4 mile would be acceptable and that means the engine would be making relatively 200HP at the crank.I don't believe anyone that claims they run a 13~14 1/4 mile time with bolt on's it just isn't happening in all reality.....

azman, I hope your not tlakin bout me being an "edragster", its nothing special nor spectacular. My engine happens to not run well. It doesnt run bad but it could be fine tuned. My power range is from 2500to7500rpm. I do run n/a, pump gas, my 60ft range from2.2 to 1.8 if I remember correctly. Thats with 24inch slicks. I definitely wont tell you my cam setting....but I will tell you that its all ab out ....SQUARE DECKING THE BLOCK!!! LOL.. oh, the interior is stripped,my WHOLE suspension is shot and worn. I cant tell if the suspension is helping or killing my time. peace.

240ka24 wrote:but I will tell you that its all ab out ....SQUARE DECKING THE BLOCK!!! LOL.. oh, the interior is stripped,my WHOLE suspension is shot and worn. I cant tell if the suspension is helping or killing my time. peace.

Not you again!!!!!Square decking isn't something that you can do with a KA block. You haven't changed the rod stroke ratio, or destroke I say you get canned from this forum.....Look up the fine definition of square decking.

LOL , big vin, I know. I was just laughing about that whole thread about 3 months ago a bout decking the block and getting high horseppower

sorry guys, I just read my first post and I might not have been clear. I am running a sohc.

Bigvinnie wrote:
Not you again!!!!!Square decking isn't something that you can do with a KA block. You haven't changed the rod stroke ratio, or destroke I say you get canned from this forum.....Look up the fine definition of square decking.

Yes you CAN square deck a KA block. You can square deck ANY block! Square decking a block is when you machine the top side of the block in direct relationship to the upper saddle of the main bearing bores. It's done on a "correct" engine blueprinting to get every piston at the exact same piston height in the bore. If you take a "production" block and measure the distance from #1 main to the top surface of the block and then repeat the procedure on #5 main and the top of the block, you will most likely find that one end of the block is "thicker" than the other. The block is then not "square". When I'm building an engine that I want something like .009 piston protrusion, I HAVE to square deck the block. If the block is .005 out of square, then I may end up with #1 piston at .009 protrusion and #4 at .014 protrusion and my compression ratio will be where I want on #1 and too high on #4 and may even cause piston to "something" contact. The difference in compression ratio between #1 and #4 will also make for some interesting crank harmonics as well as problems tuning especially with carb jetting.

Your mileage may vary, Mike

^ I smell a GOOD "Tech Article" coming...

240, I'm SO glad you said you were kidding. I was about to bring the pwn.

mikegt3 wrote:
Yes you CAN square deck a KA block. You can square deck ANY block! Square decking a block is when you machine the top side of the block in direct relationship to the upper saddle of the main bearing bores. It's done on a "correct" engine blueprinting to get every piston at the exact same piston height in the bore. If you take a "production" block and measure the distance from #1 main to the top surface of the block and then repeat the procedure on #5 main and the top of the block, you will most likely find that one end of the block is "thicker" than the other. The block is then not "square". When I'm building an engine that I want something like .009 piston protrusion, I HAVE to square deck the block. If the block is .005 out of square, then I may end up with #1 piston at .009 protrusion and #4 at .014 protrusion and my compression ratio will be where I want on #1 and too high on #4 and may even cause piston to "something" contact. The difference in compression ratio between #1 and #4 will also make for some interesting crank harmonics as well as problems tuning especially with carb jetting.

Your mileage may vary, Mike

You missed the point. I had an argument with another member that became banned in the forum. The claim was that square decking made a alot HP and torque to his engine with an all stock build. The HP gains on square decking are to small, to the price that it cost to square deck a block.If in fact the build has exceeded an amount to where it is worth square decking than go for it. In most cases a stock internal KA will show minimal to little gains. So really no need to square deck unless you show it makes HP and torque across the board......I can make more power clover leaf welding a head or milling it than I can square decking the block....

Bigvinnie wrote:Modular FORDS

The process of “Square decking” a block is when you make both deck heights symmetrical to the centerline of the crankshaft. This then requires the crankshaft throws, connecting rods and piston pin heights all be indexed to insure they are all the exact same length. Generally this is too much work, and not cost effective for the average performance engine.

So in any case can you square deck a KA block, in reality yes, but it is a 4 banger not V shaped engine block (is the cost really worth it?) NO, not unless the build demands it for optimal performance. I would highly doubt that casting on a 4 banger is that bad that it truely needs square decking to begin with, especially when you are dealing with OEM.
Modified by Bigvinnie at 7:54 AM 2/18/2007

Square decking is NOT for getting more power. DECKING the block is for gaining more compression. OR you can weld up the combustion chamber in the head OR install pistons with a higher dome. All will raise compression and horsepower (if you know what to do with the extra compression) The ONLY difference between "square" decking and "plain" decking of a block is how the machineist supports the block in the decking fixture. When you support the block bye setting the main bores on a "bar" thats EXACTLY parallel to the cutting head, you can then make a "square" cut on the top surface of the block. When the block is supported on the oil pan face of the block (cheap and fast way) then your cutting the top surface parallel to the oil pan surface or bottom of the block. It's done that way because setup time is MUCH faster and cheaper. I am in NO way saying that you NEED to square deck a "street" engine. All I'm explaining here is the way we build 235hp L20B and 340hp KA race engines. My machineist is Fred Link. Fred was the head machineist for Bob Sharp racing (you Datsun fans may know that name) for 12 years and there is NOBODY better than him when it comes to Datsun/Nissan engines. I build all the L series engines and Dave Auerbach (former chief engine builder for Bob Sharp) builds all my KA engines. I understand cost factors and I also understand horsepower factors. The question is,...Do you want money in your pocket or do you want horsepower under the hood? You can't have both!

BTW, I have seen .010 difference in KA block "thickness" from front to back. Street exceptable,...Yes. Race exceptable,....NO! AND it doesn't matter if the block is inline 4,6,V6,V8,V10. If you use a machineist that's worth anything, He square decked the block! Hell,...Even Ferrari does it to their "street" car blocks. I was there and saw it done!

Mike

I like your reply Mike.....No argument hereYou really should write a thread that could be stickied in this forum....You seem very knowledgeable on square decking, and building in general....Now only if you can get a group together to talk to Paul S. at NISMO to put the fully counter weighed cranks,rods, and pistons into production then there would be one powerful high rev steetable KA......

Awesome info.

Also, using a torque plate is a MUST on the KA - You'd be surprised how far our blocks deform when mated to the head.

I called my machinist - Mine was square-decked. The torque plate was used, and it was bored at 195 degrees temp. It was honed to 800 to eliminate "break-in", and all parts were blueprinted (weight-matched) and entire assembly was balanced.

Jason (rotorimp) did a VERY close-tolerance build on my KA, measureing everything out to the ten-thousanth, far closer tolerances than Nissan calls for.

It's all worthwhile for max power and reliability.

mike is right, of course you could deck/square deck any block.I also believe vin, I dont think square decking the block can make power(as much as that old thread claimed).oh azhiman, I just read that you decked your block, you must be makin about 6-700hp?hehe.. I have yet to machine anything on my or any of the blocks I/WE have worked on. wish I won the lottery, then I would have enough money to machine eerything and even square deck my camshaft.

I <3 nico good info.mike welcome! glad to see we get more then kids on here. so can I get this group together to build my sohc ka???? I would have a monster with all this input and knowledge

wow thats pretty funny i read that old thread and to me it seems that the guy was saying the same thing that mikegt3 is saying and it seemed like bigvinnie just tried to act like a know it all basiclly the same way he sounded in this thread ..but WOW even the CEO's machinist square decked his block, but must have been just to take money out of his pocket and screw him right bigvinnie? I work at a perfomance engine building shop and bigvinnie just drop trying to prove people wrong ok.