Author Topic: anyone know their engine maths, high comp superchaged ka24  (Read 5040 times)

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Offline Sik_bb_trx

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Hi all,

I recently went to the vic antrx cruise with my freshly built high comp ka24, appart from the stupid lifters the engine performed great, having said that im already bored with it, cut a long story short is putting a toyota sc14 supercharger onto the 10.1 comp engine viable, im sure someone knows the maths to work it out, im only planing to run about 5psi boost

any input would be appreciated  ;D

cheers

Offline SleepaTi

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #1 on: Jan 7, 2010, 11:21PM »
just pull heaps of timing out &/or fatten up the injectors
NO! it's NOT a fucking SR20!!

Offline Budgie

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #2 on: Jan 7, 2010, 11:24PM »
Nice :)

Sounds like it will be go quite well mate, go for it!  S/C FTW! :P :)
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Offline Colby

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #3 on: Jan 8, 2010, 08:57AM »
I dont know the maths, but I would think up to about 5psi would work fine. 
Thinking about it logically...
Roughly 15psi is an extra atmosphere (1bar), and people do that on standard compression.
You want to put through about a third of this... so 0.3 bar

now the compression of a normal engine would squish something with a volume of 8 into 1 (at 8:1 ratio).  adding 1bar basically makes it 16:1.
Yours is normally 10:1, jumping about 33% to around 13.3:1.

Thats probably very basic and neglects quite a few things, but thats just how i'm thinking of it... the engine should roughly take it about as well as a 8:1 compression engine takes 9.5psi.

Someone smarter please let me know if there are total floors in my logic.

Offline sxtacy

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #4 on: Jan 8, 2010, 11:21AM »
I was reading somewhere a while ago about high comp civics being supercharged. I think it worked out that about 5psi was equivalent to 10psi (give or take) on a standard low compression engine. So the same power with less psi, but more responsiveness.

The good thing was they could just get a standard type r engine and bolt a supercharger up running only 5psi with no trouble.

nothing.

Offline Sik_bb_trx

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #5 on: Jan 8, 2010, 03:49PM »

Excellent  ;D

picked up the supercharger today from wollongong will be bolting it on shortly, il post up the results when im done

Thanks All

Offline chr1S

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #6 on: Jan 19, 2010, 10:01PM »
Fuckin do it Shaun!

KA24 heads will not be able to control the flame front as good as honda motors simply for the reason of an offset spark plug and the larger bore. Don't try compare honda motors with these series of nissan engines lol..

All I can say is, E85 !
Don't let the opinions of the average man sway you. Dream, and he thinks you're crazy. Succeed, and he thinks you're lucky. Acquire wealth, and he thinks you're greedy. Pay no attention. He simply doesn't understand.

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to be fair, it wouldn't be ANTRX if we stayed on topic.

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Offline SSS

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #7 on: Jan 20, 2010, 06:51AM »
All I can say is, E85 !

Agreed

Offline Jono

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #8 on: Jan 20, 2010, 10:35PM »
All I can say is, E85 !

Where can you get E85 easily?

I've never seen it for sale anywhere in Qld!
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Offline SSS

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #9 on: Jan 21, 2010, 06:55AM »
There are more servos in nsw that sell it, only 2 here in vic sell E85. :(

Offline pedro666

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #10 on: Jan 21, 2010, 07:18AM »
i was looking into doing this before my KA died, very keen to see the results. ;)

Quote
e85 is not suitable for use in any other motor vehicles other than those designed specifically for e85, such as the new SAAB BioPower 9-3 and SAAB BioPower 9-5.

http://www.unitedpetroleum.com.au/media.asp?pgID=203
the words "race car" spelled backward still spell "race car"? 




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Offline Sik_bb_trx

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #11 on: Jan 21, 2010, 04:05PM »

Il keep posting up the results but at the moment I cant keep hydraulic lifters alive ling enouph to give the engine a good workout just keeps exploding them at 7000rpm, then tap tap tap tap all the way home from the track  :(

Hurry up and sell me some solid lifters, ive been perving on a set from the states but dont know how to get them here !!!

Damn it

Offline chr1S

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #12 on: Jan 21, 2010, 04:12PM »
Pedro, you can use E85 in our cars, we run E85 through early 90 honda fuel lines with no problems :).
Don't let the opinions of the average man sway you. Dream, and he thinks you're crazy. Succeed, and he thinks you're lucky. Acquire wealth, and he thinks you're greedy. Pay no attention. He simply doesn't understand.

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to be fair, it wouldn't be ANTRX if we stayed on topic.

and if someone wasn't cranky at Chr1s for something he said...

Offline Kranzy

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #13 on: Jan 21, 2010, 04:25PM »
Il keep posting up the results but at the moment I cant keep hydraulic lifters alive ling enouph to give the engine a good workout just keeps exploding them at 7000rpm, then tap tap tap tap all the way home from the track  :(

Hurry up and sell me some solid lifters, ive been perving on a set from the states but dont know how to get them here !!!

Damn it

You have pm.
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Offline SSS

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #14 on: Jan 22, 2010, 07:29AM »
Il keep posting up the results but at the moment I cant keep hydraulic lifters alive ling enouph to give the engine a good workout just keeps exploding them at 7000rpm, then tap tap tap tap all the way home from the track  :(

Hurry up and sell me some solid lifters, ive been perving on a set from the states but dont know how to get them here !!!

Damn it

Just buy them from O&J; I can't sell you a set of my new ones until I have my own new set done and installed in my U12.
They should post them via USPS.

Offline Colby

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #15 on: Jan 22, 2010, 07:54AM »
Hurry up and sell me some solid lifters, ive been perving on a set from the states but dont know how to get them here !!!

There are some good cheap flights on at the moment... just go pick them up :P

Offline Sik_bb_trx

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #16 on: Jan 22, 2010, 04:04PM »

lol I like colbys idea, my problem is id end up buying every cheep american muscle car and get stuck there, have to run to mexico to escape the temp visa guys and live with my transams and lincoln's in a mud house  ;D

O & J were the mob I saw advertising on the net theyre lifters look sweet id love to get a set il send them an e-mail tonight

cheers

Offline pedro666

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #17 on: Jan 23, 2010, 04:02AM »
saw a lincon today, i swear the boot was as big as my unit! sure you could easily live in there...
the words "race car" spelled backward still spell "race car"? 




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Offline fraz

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #18 on: Feb 18, 2010, 05:25PM »
make sure you dont spin the blower over 10,000. it will melt the teflon off the rotors.

(assuming 100% VE) The blower is 1.4L volume per rev. and your engine is 1.2L volume per rev. If you spin the blower at 1:1 you should get 0.17 Bar boost. if you gear it up to maximum, which is 10k at engine 7k, you will need a crank pulley 147% the size of the SC14 pulley, which will give you 0.47 Bar or 6.8-6.9 psi.
Keep the electric clutch on it. Have it turn on at say 50% throttle or higher. Also add a 1sec timer to the relay so it wont turn off between gears.



Should wake it up a bit :)

 I predict new tryes...



weekly.......
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Offline MAG86

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #19 on: Feb 23, 2010, 07:15AM »
there is a rebic injector driver on ebay, extreemly retro 90's jap 'ecu' for a single injector
has map sensor
tacho input
injector duty cycle

basic as, it switches on at a certain combination of pressure and revs...

i was going to buy it for controlling water injection, helps with high comp under boost (chemical intercooling)
cleans the carbon out of the 'bustion chamber too...

whatever you do, an Air Fuel Ratio guage is a must (accurate,,,, wideband even)
[0O\======/O0]

Offline Sik_bb_trx

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #20 on: Feb 23, 2010, 04:40PM »
Supercharging on on hold I ran my pintara into a mountain so now I need to fix it, damn it, the most expensive bit is my nismo rim  >:(

anywho il re open a thread when i get to doing it

Offline pedro666

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Re: anyone know their engine maths, high comp superchaged ka24
« Reply #21 on: Mar 3, 2010, 10:33AM »
not sure if this is what your after , but its handy anyways

http://home.earthlink.net/~jalby/puter.htm
the words "race car" spelled backward still spell "race car"? 




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