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Discussion Starter · #1 ·
Well, just a week shy of six months since I built the 12.5:1 SOHC VTEC, and I'm done with it. Tonight I tore down the whole motor, rebuilt the bottom end, and pulled the PM7s for my PM6s. It's tough to do after investing so much time and money into this build, but I'm just sick of it.

First thing, I should have listened to my own advice to everyone who asks me how to do it. TUNE IT RIGHT, and ASAP! Matt has tried many times to get the damn thing running right with Crome, but it just refused to cooperate. I really needed to get it done on a dyno, but I can't afford that. I've been driving it since the end of may first on a pinging stock P28, then soon after on a bad, too rich tune. It was terrible to drive, just boggy and slow and loud. Riding in Jared's stock A6 Si put it to shame (not that the A6 is bad, I wish mine never blew up!). So yeah, to everyone doing it, go spend the cash and tune it right. As a result of driving it with preignition, I pulled the pistons to find 2 of them had some cracked/broken ring lands.

Next, don't skimp on anything and don't rush. Another thing I tell everyone, of course I didn't do that. I thought I would have the motor together in a couple of days, little did I know it would be almost 7 weeks in the shop with my car. I re-used rings because I had a box of the wrong ones, and I again re-used bearings because they looked ok. The bearings still looked fine when I threw them away tonight, but the rings weren't doing anything, Matt can vouch for that. This time I went for all new stuff, ACL bearings for the whole bottom end, regardless of what everything looked like, ARP rod bolts, new OEM head bolts, JE rings. I cleaned the crap out of the PM6s and smoothed the tops to mirror shine. Even though I didn't have problems aside from the oil burning, I always was scared of spinning a bearing, now I don't have to be.

Last thing, have a plan, and reasoning to back it up. When I blew up my A6, I was on the way to RI that night to pick up an A6 block and Y8 head. I thought I would try out a mini me. Then we had the integra in the shop with a broken valve, and I thought it would be cool to toss in the PM7s. Now six months later I'm back where I should have been then. For a while I've just been crazy about running a high-comp D series to beat a B16 (and a few of my friends), but it's just stupid. I don't think the pain in the ass and the money is worth the little power I can get over running mid-11's on pump gas.

So what I'm doing now...
I got the motor in and running. No extra bolts this time! I did almost all of the work alone, Jared helped me getting the motor out, and I had a hand once in a while to hold stuff, like when I was torqueing the flywheel bolts. I was surprised how easy it was to get the motor back in by myself, I only did it once before and it was a pain in the ass. I must be getting better, it took about 10 minutes! Anyway, everything went smoothly, even the bitch pin (and I'm damn glad I have near-new balljoints!).
Of course though, there has to be a catch. I dropped one of the crush washers on the fuel filter into the abyss, so I'm dribbling fuel all over and I don't want to start breaking it in until I fix that. Needs a new filter anyway, so I'll do that as soon as NAPA opens.

So now I have a pretty basic A6/Y8 mini-me to drive around...
But I have an extra Y8 head! I stripped it down tonight, it's getting ported within the week, and shaved to acheive a low to mid 11:1 compression ratio. I'm getting *something* from Crower next week to go in it, and hopefully that will give me the power I was hoping for with the failed 12.5:1 build.

I think when this one lets go I'm going B... after all B is the new D

EDIT: wanted to thank everyone for helping me out with this pain in the ass engine! Especially thanks go to Matt Miner, helped me in parts, labour, tech stuff, and best of all let me drive his beast of a CRX in autocross when mine was broken
 

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downest said:
So yeah, to everyone doing it, go spend the cash and tune it right.

Next, don't skimp on anything and don't rush.

Last thing, have a plan, and reasoning to back it up.
Great set of guidlines/ advice!
A majority of the time, this is my way of thinking, sometimes not, but a most of the time. :lol:

At least you learned something and now have a new plan. GL with the new build.
Measure 10,xxxx and cut once! :D

If you go to the B-side soon , LMK if you wanna get rid of your d series Si transmission. 8)
 

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I'd like to personally thank Tom too. Since i got on this site I've been slowly collecting parts for my y8 mini-me. I have learned a great deal from TOm and Matt along the way, and now I can make wiser, or at least more well informed decisions about my setup.
If I was still back there Tom I'd take you out for some good beer. Let us know how the new motor runs once you get it fired up.
 

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did someone ask for an si transmission? I have at least 3 in my basement....

back on topic. I really wished tis turned out better....I think taht right after the build, we shouldve started with some real high octane gas, some sort of a static retard, and a fuel bump. Then I shouldve tuned back form there....honestly though, this last weekend I think we were making good progress, but the car had this random stutter stumble that I couldnt figure out. Seeing that there were broken ringlands and whatnot, it all makes alot more sense. man, i need an inertia dyno....:p

We will get this motor setup very quickly, we had the forethought for me to burn a decent chip ahead of time. Going with a more conservative stup sounds like a great plan, basically now we just have a strong bottom end setup and Tom'll put a nasty head on it. That should be more the sufficient.

And yes, everyone likes driving my car :) hopefully this week its gettign a new rad support and thedoor hinge finally fixed so things actually line up.

At least its alot chepaer to learn on a D !

[email protected]
 

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mattminerDOTcom said:
did someone ask for an si transmission? I have at least 3 in my basement....
Yea, i am still looking for one. You contacted me before and you posted this:
mattminerDOTcom said:
ive got a couple extra si trannies down here in RI. they all work and shift smooth, but i dont know which one was from which car so i cant tell you alot of specifics.

I know the one main problem d trannies always seemed to be having is the rear 3 mount bolts stripping out, i know i have to retap at least one of mine.
I would be interested in one of them, perferably one that does not need to be retapped and if you knew which was which for sure.
 

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IMHO, the VTEC B series are too over-rated. They are definitely excellent engines and worth upgrading to if you have a B non VTEC already in your car. But for fun and all around best bang for your buck you cannot beat a turbo D series. I have had a B16, LS/VTEC and a B18C5 in several CRX's I have owned and none of those engines compare to the fun I am now having with my lowly D16Y7 ( non VTEC) and a small home made turbo kit. 155 pounds of torque at 3000 RPM is simply awesome, I don't have to rev the crap out of my engine to make power, and the parts are so damn cheap! I can get several newer D series engines that don't require mounts, linkage, axles, etc, etc for a few hundred bucks at the local junk yard and there are lots of them! I have a friend runing 1.6 D series VTEC(sleeved, pistons and rods) making 340 HP to the wheels. 11.9 at 124 MPH 1/4 mile and the whole thing including turbo, engine, car and build up was a bout the same as getting a used B18C5 swap.

I'd say turbo D's are the new B's.
 

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baker,
oh, sorry man haha. I will look into them then. I completely forogt we talked about this before. my bad!

crxter,
turbo d rocks, but if you dont want the boost, b is 'B'est
I also have both, and god i love my turbo D, its faster then my modded B18C1, cost me about the same to build/setup. im being forced to boost the b as well to keep up.

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I dig the SOHC D-Series, too...a good site for these engines:

http://sohchonda.com/forums/

I know it's not the most popular option, but I plan to supercharge (JRSC) my SOHC VTEC ZC (basically a Z6). It's a daily driver and I want power instantly at any RPM with a minimal amount of hassle, tinkering, and replacing of existing parts (intake, header, exhaust, etc.) so I think I will be happy with it. I'm not looking for the ultimate autocross or drag car, just a daily driver that's fun as hell to drive around where I can punch the gas at any time and any RPM and be greeted with instant power.
 

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ryan_long_01 said:
I dig the SOHC D-Series, too...a good site for these engines:

http://sohchonda.com/forums/

I know it's not the most popular option, but I plan to supercharge (JRSC) my SOHC VTEC ZC (basically a Z6). It's a daily driver and I want power instantly at any RPM with a minimal amount of hassle, tinkering, and replacing of existing parts (intake, header, exhaust, etc.) so I think I will be happy with it. I'm not looking for the ultimate autocross or drag car, just a daily driver that's fun as hell to drive around where I can punch the gas at any time and any RPM and be greeted with instant power.
A JRSC is as complicated to install as a turbo in my opinion. Aside from the welding required, turbos are a snap. I have a very small IHI RHB5 turbo that spools up in absolutely no time. I have 6 psi at 2800 RPM plus I have a nice intercooler, something you can't have with a JRSC. Just about everyone I know who at one point had a JRSC has now a turbo.
 

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Discussion Starter · #12 ·
Well I did some of the initial break-in today, and I still have a bit of the damn stumble! I changed the spark plugs and it's a little better, I'm going to try new wires next, since it seems like an ignition/misfiring problem. It's better overall though, no pinging and has some more go on the street. Time for another oil change...
 

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Next, don't skimp on anything and don't rush.
Well I did some of the initial break-in today, and I still have a bit of the damn stumble! I changed the spark plugs and it's a little better, I'm going to try new wires next, since it seems like an ignition/misfiring problem.
Dont skimp out on thing but you dont buy new plugs and wires? Thats one of the first things you do on any engine.

Good to here you found a combo that will work with your car. Have fun with it as we all know you will.
 
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