ca20 conversion

Post by **Ca_laurier** » Mon Oct 10, 2005 11:23 am

alright i searched for all the info on here and there seems to be very little. But someone mentioned you can swap the ca20e crank over to the ca18det with some modifications.

i am picking up a stock ca18det long block to replace my current one which is damaged by running lean and i thought it would be a good oppertunity to start this. just wondering if anyone knows anyone who has done it before.

Post by **float_6969** » Mon Oct 10, 2005 1:09 pm

I don't think you can run the CA20 crank in the CA18.

I have heard of people using the CA20 shortblock with a CA18DE head, but it's not a straight swap, the CA20 rods are crap, and I've heard (never seen on) that the CA20 crank isn't real awesome either.

Post by **datsunboy** » Mon Oct 10, 2005 2:06 pm

my mate has got a CA20 bottom end with CA18DET head.he has used DSM conrods of some sort, and forged pistons.they've had to machine a fair bit off near the thermostat housing I think, to clear something....I can't remember.I think he's still using a stock CA20 crank tho.the motor isn't finished yet, so not sure what the outcome will be.

Post by **boost_boy** » Mon Oct 10, 2005 2:38 pm

Ca_laurier wrote:alright i searched for all the info on here and there seems to be very little. But someone mentioned you can swap the ca20e crank over to the ca18det with some modifications.

i am picking up a stock ca18det long block to replace my current one which is damaged by running lean and i thought it would be a good oppertunity to start this. just wondering if anyone knows anyone who has done it before.

Invest your money into go-faster bits as this CA20 converson is overrated and people are headed for major problems.

Dee

Post by **rico05** » Mon Oct 10, 2005 4:25 pm

I agree with Dee. I myself have done lots of research on teh interweb on this subject, and with so many strong options for the 1.8 displacement (or CP pistons at 85mm taking it up to 1.9l LOL) there is little reason for the headache of a CA20 build....unless God loves you and you find a Tomei or HKS stroker kit.

Post by **zero_gripS13** » Mon Oct 10, 2005 5:05 pm

any downsides to boring it to a 1.9? (thin walls or anything)..

id like to dop this when i do a performance rebuild sometime in the future

Post by **biosehnsucht** » Mon Oct 10, 2005 5:38 pm

My block still has plenty of meat left in it after going to 84 (stock is 83), but 85 would be a bit crazy.. getting dangerous at that point..

Post by **Ca_laurier** » Mon Oct 10, 2005 7:42 pm

well i guess i will just build this engine up instead. start off by building up the block and than move my way to the head. for the time being i am just going to run my car with the stock ca18 with nothing done to it. damn i miss my t28 set up. should have upgraded my fuel system.

Post by **sil_eightyRPS13** » Mon Oct 10, 2005 8:49 pm

rico05 wrote:....unless God loves you and you find a Tomei or HKS stroker kit.

there is a CA stroker kit..... TOMEI has the parts avaliable

http://www.tomei-p.co.jp/_2003....html

Post by **rico05** » Tue Oct 11, 2005 6:41 am

Bio: the 85mm was more of a sarcastic joke LOL. But I thought that it would be safe. After looking at some pics of the bores, looks like you are right....that would be a bit extreme LOL.

Yes! There is a tomei stroker kit, but good luck finding it. Tomei, JUN, and HKS have all officialy dropped support for the CA. I talked with Nismo_Freak (Alan), and when he worked at SPL (a Tomei distrubiter) they were informed that they are no longer making parts for our motor. All they have is old stock, and are not making any new internals. I have heard of shops in Japan selling them for cheap to clear shelf space for damn SR parts lol.

AS a matter of fact, Alan made a post here in CA forum about this.

Post by **float_6969** » Tue Oct 11, 2005 7:28 am

I think you can actually make an 86mm piston fit in a CA. IIRC, NISMO had one for the CA. It was a super high compression pistion, and was designed for a N/A application. I think it almost got it up to a 2.0L.

Not something you would want to do for your daily driver though...

Post by **CA19DET** » Tue Oct 11, 2005 7:44 am

float_6969 wrote:I think you can actually make an 86mm piston fit in a CA. IIRC, NISMO had one for the CA. It was a super high compression pistion, and was designed for a N/A application. I think it almost got it up to a 2.0L.

Not something you would want to do for your daily driver though...

i remember seeing this too..

and from looking at my block i am very very tempted to go with 85mm 9:1 CR CP pistons and see what happens, there looks to 'me' to be enough room to take out a extra 1mm on each cylinder with enough room for structural regidity etc..

i know from the wiz david wizard, that increasing cylinder bore increases compression alone so i dont know if increasing it 2mm will increase the compression too much along with 9:1 pistons.. i know there is a formula for calculating compression increase due to bore increase...

would be an interesting motor though, you 'may' loose some of the rev happyness, but with the increased compression and bore/displacement you may not need to swing 8500rpm...

it may also help out with soem of that missing torque..

very interesting post, i would like to see where it goes...

Post by **float_6969** » Tue Oct 11, 2005 7:58 am

I think the idea was to have it be a high revving motor. They were supposed to be very light weight. I think was kind of the "sportbike motor" train of though.

And yes, increasing bore, raises compression. For most overbores' it's only a few tenths though. A 2mm overbore is pretty drastic though, and may actually yeild you a full extra half a point.

I don't have the equations infront of me though, and you'd have to know more about the combustion chamber on the head to be accurate.

Post by **SR22DET** » Tue Oct 11, 2005 7:28 pm

wouldnt you be able to get shorter stroke con-rods and per say some 300zxTT pistons and making it fit? cause i know there was an sr20 built with some Z-TT pistons and that thing was badass

Post by **float_6969** » Wed Oct 12, 2005 4:40 am

I've heard about the ZTT pistons in the SR as well, but I think the bore is much too large to work on the CA. I could be wrong though, as I don't know the diameter of the ZTT pistons.

Post by **sideways danny** » Wed Oct 12, 2005 2:57 pm

the Tomei kit uses standard size rods and pistons with the gudgeon pin closer to the crown. I have the last ever Tomei kit with me at the moment, wish it was mine

the CA20 crank isn't forged from what I've found so you'd be downgrading by using one of those (from an 8 valve anyway, I can't find what the CA20DE material is)

Post by **float_6969** » Wed Oct 12, 2005 3:23 pm

CA20DE? Was that available in a USDM car? I've never seen/heard of it.

Post by **sideways danny** » Wed Oct 12, 2005 3:30 pm

maybe I have the wrong engine code then, which would explain why i can't find the info. there was definitely a 16v CA20 for the UK used in the Prairie.

Post by **boost_boy** » Wed Oct 12, 2005 3:44 pm

sideways danny wrote:maybe I have the wrong engine code then, which would explain why i can't find the info. there was definitely a 16v CA20 for the UK used in the Prairie.

The CA20 was never tagged with the DE badge because it never was a DOHC engine. There's the CA20E, CA20D, CA20S, but no DE.

Dee

Post by **tyrannix** » Wed Oct 12, 2005 4:52 pm

wouldnt CA20D have been dual cam with a carb?

ca20 conversion

ca20 conversion

Re: ca20 conversion (Ca_laurier)

Re: (rico05)

Re: (biosehnsucht)

Re: (rico05)

Re: (float_6969)

Re: (sideways danny)

Re: (boost_boy)

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