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[mrgreengenes]

So for shitzngiggles, i decided to build myself a highcomp, noTEC, dirty D, just to see what all the hype was about.  There really wasn't any hype, but i wanted to try some ideas i had floating around it my noggin. 

A few years back, i ordered a set of 75.5mm p29 nippon pistons, before ever even having a honda.  Well i scored a 91 crx si, for almost free, completely stock, save for a k&n drop in filter, and a turbulator POWERADDER!!!  Having lots of spare d parts lying around, as well as some B parts (you'll see where this comes in later), i put together a bastard D.

here's the ingredients:

-A6 block bored to 75.5mm
-p29 nippon pistons, same as stock p29/pm7s (everyone's favorite!)
-A6 head, rebuilt, bronze exh guides, radiused valvejob, fully ported from Hayward performance, 10thou removed for straightening.
-A6 cam, reground by Colt cams, i chose the Tri-Flow 2
-stock crank
-bisi valve springs
-bisi v2 header (as much as i wanted to build one, i just didn't wanna! PS: i had to repair this thing twice, and the post-collector elbow was angled waaaaaay wrong, good thing i can TIG)
-b18c1 gsr rods ()
-gsr rod bearings
-A6 main bearings and thrust washer
-Z6 head gasket
-ported/radiused oil pump
-act lightweight flywheel
-Z6 intake manifold, opened, ported, TB port matched to a 60mm B16a jdm TB, and an increased plenum volume
-OBD-1 conversion, tuned on Neptune, dyno'ed on dynacom POD dyno

 You may be saying to yourself...



"Why the GSR rods?  They're too narrow on the big end to work with the d crank!"
"What about piston pin size?"
WAAAAAAAHHHH!

I used the gsr rods to get the P29's to (nearly) deck height.  With the help of a great machinist who wanted to try this out, we had the GSR rod small end rebushed with a steel bushing for the pressfit 19mm p29 wrist pins.  I chose these rods as well for their greater bolt strength (9mm vs 8mm for the LS rods), and so i can say it's got B series parts in it.  Plus i wouldn't have to deck the block and buy an adjustable cam gear (i'm cheap and dutch, what do you expect).

As for the rod side clearance:  the small end width is the same(ish) between gsr/typeR rods and D16 rods.... they'll stay centered.  Oh, and as for oil pressure probs, none here.

enough bla bla-ing..
PICS!





P72 gsr rods, p29 pistons...


all lined up, ready to check ring gaps


block ready


bump stick


Necessary block notching, not your regular Eagle rod notching...  since the P72 rods have about 2mm more girth around the rod shoulder, the whole swing area needed clearancing.  NOT FUN.





TDC, to the top!


head portwork etc


moar portwork




intake manifold, opened up


capped off, more volume, does it help?  i donno


head studz, copper sprayed MLS gasket


rebushed P72 rod


parts awaiting assembly, note the bisi header.  had to notch the front crossmember to fit in the crx


garage, bench, signed pornstar photos...



before and after dyno, i was rushed and just did some WOT pulls on turboEdit ng63 rom, but couldn't get driveability nailed down.  It was running an open 2.5" exhaust at the overaxle, and had some cool resonant power bumps.  I later finished the exhaust with a dynomax VT flapper muffler, and did a Neptune tune with OBD1.  At that time, the dyno's speedo pickup drivebelt kept spinning off near redline, making a giant spike in power, like 430hp... so those graphs were useless.
I have 13,000km on this "beast" running 91 rocktane, close to the same gas mileage as stock.
enjoy!

phil

[Ntrain2k]

looks like fun!

[92CXyD]

Nice work, will there be any more dial in dyno sheets?

Make me thinking about a future engine project. 

[Joseph Davis]

Nice work, but I think there's more power left in there by working on quench.  A 0.010" skim of the head didn't do anything for the fact that the A6 chamber is pocketed and has no quench, and if you welded up the chamber to fix this I missed it.  Also, you score no points about 9mm rod bolts when the 8mm ones don't break... I would have manipulated quench pad height instead of fucking around with rod tomfoolery.  Actually, start off with a D16Yx VTEC head that has quench pads that match up nicely with P29s, but I understand the reasons why you wanted non-VTEC so that's no criticism.

You having fun stomping the shit out of B16s?  ZC-Si hybrid trans will make that setup a LOT more fun.

[HiProfile]

Thanks for posting this, way better than just the info I asked for.

160whp and all that torque is crazy for a non-v engine. If you do a D2B and give it a gsr/b16 trans you would really be raping the local B's.

[sewell94]

I'm alittle late to the party,


But this is a quality OP.


Fine work good sir.

[Joseph Davis]

You having fun stomping the shit out of B16s?  ZC-Si hybrid trans will make that setup a LOT more fun.

If you do a D2B and give it a gsr/b16 trans you would really be raping the local B's.

 

[HiProfile]

Sorry, I should make my quote "regional" in scope:

"If you do a D2B with a gsr/b16 trans in the mid-west, or a ZC-hybrid if you're 150 miles from an engine importer or trans builder that can get you a ZC gearset within 3 months, you would really be raping the local B's."

I've encountered more local H2B's and K20A's than people with ZC gears. There are also zero D-series LSD trans that I've seen around here, at least ones people will sell.

[Joseph Davis]

"If you do a D2B with a gsr/b16 trans in the mid-west, or a ZC-hybrid if you're 150 miles from an engine importer or trans builder that can get you a ZC gearset within 3 months, you would really be raping the local B's."

I'm nowhere near an importer.  I know where three gearsets are.

[Joseph Davis]

Plus importers that run through them, shipped to your door for a lot less than a B box runs.

[HiProfile]

okay I give up. fuck you

[Joseph Davis]

<3

[chris]

I like the intake manifold. I agree welding the chambers on the head would of been a great idea. Old school thought process but it still works.

[snm95ls]

"If you do a D2B with a gsr/b16 trans in the mid-west, or a ZC-hybrid if you're 150 miles from an engine importer or trans builder that can get you a ZC gearset within 3 months, you would really be raping the local B's."

I'm nowhere near an importer.  I know where three gearsets are.

I know where one set is, and it just needs a chassis to go in.

Anybody need/want a DOHC ZC diff and intermediate shaft?

 

The wheeze is a classic.

[Joseph Davis]

I'll take both, sure.

[snm95ls]

I'll take both, sure.

If you are serious, let me know before the end of the week.

Make an offer?

 

[chris]

I was digging around in the rafters and found my old welded chamber a6 head I did forever ago,thing makes me smile. I just did a new d series spacer design for the runners talked to jay about the other day. Need to get off my ass and install on it on my crx and see if it will actually do anything


Sad part is it if really does make power I couldnt even sell them,thank you american economy.


zc/si hybrid for anyone who hasnt experinced it just a pleasure to drive. Should of never sold mine.