Hello, and nitrous...

[maldo]

Get ready for a very expensive project. I have a '92 RS as well and have toyed with all the things you are talking about. Check out a swap meet for a used nos system. You should be able to find one for max of $500. I would suggest not going over 75hp on the motor though. As far as headers...I haven't found any. Try unbolting the exhaust and see if you it helps. You may lose too much back pressure. Rods and pistons seem to be a difficult find as well. Look into boring out the motor...I think there are more possibilities if you go up .040. If you find anything exciting could you post it, I would like to hear about it.

[maldo]

You are right that Miata parts do work on the B6E but the biggest problem is that there is a lot of custom work involved for some parts (ie. turbo kits). I to have a 2.25" exhaust and a PRM intake with considerable power gains. I also installed an MSD 6AL and Blaster 2 coil to go with my Magnecor wires...this helped the top end and a little on the low end. The idea of not being able to overbore is interesting. I hadn't heard that, but is quite possible as there isn't much room. You could shave the head to increase the compression, but the gains would be minimal. What about the possiblity of stroking it to a 1.8L using a Protege crank? Check out Gude, they can do a fair amount of engine work on the B6E, claiming gains in the 40hp area. Cost is about $1500 USD<P>

[maldo]

You are right in wondering how long it would take Gude to do all the work...your reason is the same as mine for not doing it yet. As far as I know the Protege motor will bolt in with a few mods. It is basically the same as the 1.8l BPT form a GTR which can be swapped in. Not to mention Dave Lauzier's MX sports a protege motor. The problem is he originally had the v6 so less parts had to be modified. Check Vaughn's 4 cyl. swap link in the engine swap link on this page. There is one other possibility that you haven't mentioned and talking about a rx-7 reminded me about it. The '88 rx-7 uses a MAF with identical connections as the ones in the sohc. The difference lies in the fact that it is bigger, flowing 80cfm more than the stocker. An air/fuel gauge would be needed to tune it properly but this could be beneficial if you go to nos. The injectors that you can use are the 250cc ones from any mazda or toyota, either bosch or nippondenso will work.

[Brady]

You know... Ive been following your guys conversation and I just dont know what to think. I have a SOHC 4cyl and I was thinking about just hopping that engine up for a whole week or so... that passed a long time ago! I dont feel that their is enough potential in that engine to meet my expectations. NOS... hmmm, i think it seems was too dangorious, especially for this engine.<P>As of right now, Im saving up for and engine swap. Havent figured out which engine yet but thats the route im taking. Im tossing the idea of either the B6T 132hp- which i know has been done in an mx-3, and is farly easy; and the BPT engine- which I havent seen done yet but would be pretty sweet sittin at 180hp. Thats more power than the 2.5 v-6 that these GS owners are spending two to three thousand dollars to get! And its lighter too. The modifications that you guys have been descussing seem pretty extravigant to me, and I dont think your going to get exceptable power gains as you would for nearly the same costs as these engine swaps. And after the engine is put in, there is soo much room for mods with the new engines, because they are still STOCK. When your modifying the current SOHC, their is going to be a point to where you cant do anything anymore (without spending rediculus amounts of money that is). But think about it.. both of these engines are turbos, which means they are already equipped with a much much stronger "bottom end" so I wouldent hesitate running a low shot of NOS on these. <BR> <BR>Anyways, this was more that I was going to say, but... thats my opinion.<P>Brady<P>------------------<BR>'92 Clear White RS<BR>Custom intake<BR>Custom exhaust<BR>Tell you more later!<p>[This message has been edited by Brady (edited December 17, 2000).]

[maldo]

Ok, so I understand the concerns about what the B6E can actually handle. These are valid as it is quite difficult to extract high horse out of a sohc. The fact is that the engine is so closely related to the miata that it should manage this power quite well. Ultimately, I am also planning a swap to a 1.8BPT motor from a GTR that comes pumping out approximately 210hp. For the time being though, modifying my sohc is my only option until I finish my degree. The GTR can and will handle more power than the sohc - lower compression, better pistons, dohc, etc. <BR>The nos is a good idea and the best bang for your buck. I would go dry system as that way if you do swap motors later, you can just pull out the nos easily. I do recommend getting the larger MAF from the rx7 as well as a fuel pressure regulator, WeaponR makes a good one, I wouldn't worry too much about the injectors yet. Get a air/fuel ratio meter though as there is no point blowing the motor.<BR>

[Brady]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Tyranos The Great:<BR><B>I'm currently undertaking the task of finding a used nos system. (If my wallet and bank account can handle it!) I'll go about 40hp to begin with and see what happens. If all goes well, I'll find some good forged pistons and rods. After that maybe I'll start tuning the suspension and save money to upgrade the engine even more.</B><HR></BLOCKQUOTE><P>I dunno- I understand were you guys are coming from too; somewhat. Im lookin at the BPT 1.8, gives 180hp right- and its only like $1200 from corksport. Thats cheap alone. Sure sure you are gonna spen some more for extra s--- but whats it going to top... $1700, with installing yourself? Maybe not even that much. But when you guys sit and talk about forged pistons, and NOS, and custom cams.. that just amazes me. Honestly... i think your waisting your time, not to mention a lot of money. Run through this; NOS set-up, whats that like $400 and up? Custom cams; you said $1000- damn! Forged pistons; thats gotta be another $500 and up! Mark my word.. youll still be way underpowered than the BPT. And for the same price! Or More!<P>Save your money big guy- dont be impatiant, save your money for the big daddy GTR or BPT, either way youll be much better off!<P><P>------------------<BR>'92 Clear White RS<BR>Custom intake<BR>Custom exhaust<BR>Tell you more later!

[maldo]

Just so everybody is clear, the BPT from the GTR is over $1800 USD and the BPT from a GTX is $1150 USD at Corksport. Throw in the fact that you have to swap out the axles, transmission, shiftlinkage, engine mounts, ECU, clutch & flywheel, etc. and the cost jumps considerably. Even if you go to a salvage yard. Brand new nos kits are $700 CND and are quite simple to install. The other option is to swap the KL-ZE into the 4 banger, A-spec Performance will do this for $4800 USD. So do a little cost calculating and the nos is the best bang for your buck.

[MAZDASPEED STEVE]

Sorry guys but I have to put in my 2cents, take it or leave it. Before you guys get all hept up on nitrous, there's a couple things you might want to take into consideration.<BR>-how old is your engine<BR>-how many km or miles are on the engine<BR>-the clearance on your pistons, ex build up over the years.<BR>-if in doubt, don't do it or you'll have an early funeral for your engine<BR>-if your engine is mint letr rrrriiiipp!<BR>Might I suggest dropping in that engine with more h.p.sauce, then work your way up from there.

[maldo]

That's a good point Steve. Mileage will affect how well the engine will handle nos. I do feel though that my engine has low enough mileage and is in excellent shape so it wouldn't hurt mine. I am not exactly planning this mod but Tyrannos is, I am interested in the results though. What I really want is the BPT from a GTR, but that will have to wait. Until then, nos might do.

[MAZDASPEED STEVE]

I myself was lookin into getting nos, but my gs now has 190,000 km. So I figured I'd get some little goodies like a coil, pulleys, and possibly a powerchip for X-mas. But what I really want to get my hands on is a MX-6 engine. I got an estimate from Jeff and he said $1500-2000, but when I called Mazda they told me $7200 for a brand new '97 six cylinder. My car is a '92, should I have asked for a '92? Maybe you guys can help me out and give me some more details on how and where I can get my hands on an MX-6 engine?<BR>Thanx Dudes.