My A6 NA Project (HMT Style) 56pics
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From: Everett, Wa, usa
My A6 NA Project (HMT Style) 56pics
::yes I did post this is the All motor forum, but figure some Crx guys might like this write up as well::
ok first off people are going to be like? "WTF a NA D16a6? gimme a break" well, that is true, but I'm kinda building this engine for a specific reason, no its not a Honda-challenge engine or some type of racing engine. It was more of an experiment. Using all OEM parts and having to keep the engine looking like it was stock.
Starting off with a 88 D16a6 from a Civic SI (150k miles) I recently did a ZC swap in for a customer so I got it for free. The a6 puts out a blistering 105hp at the crank maybe 90ish whp.
Engine was pretty dirty since it was pretty high milage, I went ahead and dissasembled the engine.
Stock Intake manifold all carboned up
The head was pretty tired as well, full of carbon, exhaust valves were beat to hell.
Nice and black
Cleaned the block with Super clean and some mild degreaser and gave her a quick hone job.
I perfer Ball hones because they leave nicer cross hatch marks.
Standard bore Dohc ZC pistons from ebay. Comes with pins and rings.
Everything dissasembled and cleaned up.
Stock intake manifold being cut in half
Intake manifold chopped in half, you can see how small the runners are.
First thing was cutting the bridge's off on the plenum.
Then grinding them down smooth inside.
As you can see Porting makes a huge mess, so be prepared for a big clean up
Port matching the ports to about the same size as a B16a inlet.
Lower intake opened up big time, I spent several hours porting this damn intake manifold.
I hate porting.. just looking at these pics reminds me how much I hated it. Be sure to where ear plugs when doing this, because after 5 hours of grinding on metal it really gets annoying. All the guys in the shop wanted to kill me
Upper and lower intake all done. I ported the entire length of the runners.
The plenum all ported out (60mm inlet)
Upper and lower attached
Special porting bits I had, I made 1 of the tools, I welded a "whipit" on the end of some 1/4 rod so I could smooth out the insides of the runners after I ported them out. You can get these long carbid bits on tool trucks like snapon/mac/mactco etc. I also recommend using a Electric die grinder because they are easier to control and quieter.
Manifold welded up on the front side.
Can't even see the weld when all the **** attached
Next was the flywheel, I wanted to take a few pounds off this bitch.
Slapped the bitch on the brake lathe and went to town, took about a little over a hour. But I got 6.5lbs off the backside.
All done, I even did a slow cut on it
The Cylinder head... I wanted to shape the combustion chamber how B18c (gsr) cylinder heads are, this would require tig welding the areas shown above. This would also bump the compression up alot.
I welded up 1 chamber and started freaking out because it was really hard to control the bead. I was unaware that cylinder heads "sweat" when they are heated, so all the oil and **** comes flowing out of the metal. It made it really hard. So the master aluminum welder Lional did the rest for me. (thanks dude!)
As you can see I ported the **** out of the head, I had around 10 hours total in the head, I opened up everything.
Exhaust ports all polished up. The head also received a 3way valve grind and resurface.
Intake ports all ported out. Sorry I didnt take to many pics when I was doing the head because I forgot. I was in the "porting zone" lol.. the head came out real nice and I was really happy with it. The ports are all port matched and are about the same size of b16a ports, (maybe slightly larger) and by no means I'm not a professional head porter..
The block with the ZC pistons installed. ZC's have the largest dome on top of the piston compared to any other D-series piston. This really bumps the compression up on a D16a6 block.
Bottom end all cleaned up.. Did I replace the bearings? hell no, lol I couldnt beleive how good they looked I did replace 1 main bearing on the end because it was a little worn. I plastigauged the entire bottom end and it was perfect.
The Delta 272 Camshaft, its basically just a regrind. Delta is about a hour from my house so I picked one up. Pretty dang cheap, 49 bucks!
The Exhaust manifold, I compared the ZC/A6/Z6/Y8 manifolds and the ZC was by far the biggest.
ZC on the left, and the A6 on the right. The ZC uses a 4-2-1 design vs the 4-1 like the A6. Gave the mani a coat of high temp flat black.
Since I could not use a "header" I knew that alot of modifactions would have to be done to the stock manifold.
I found a B16a downpipe, and it appeared to have larger pipes, but the exit pipe was really small, just like the ZC. Both measured at 1.5in
I went to ******* town porting this manifold, I really hate porting cast iron more than anything. It stinks, it smells bad and I just overal hate it. Port matched for the most part, but the roof was raised.
Ported the Welds on the downpipe, and slightly enlarged them. Also port matched with the manifold.
Chopped off the shitty stock 1.5in flange and welded on a nice 2.5in pipe w/ 3bolt universal flange.
Using a D16z6 Head gasket and a Nayhow mfg Intake manifold gasket (basically the exact same materal as the Hondata IM gasket) It keeps intake temps down.
Engine being assembled
Using Prelude H22 345cc injectors on a modified Z6 fuel rail. (these will both be changed later to stock)
Big thanks to Chris M. for the Bored out D16a6 throttle body. Bore tapered from 60mm to 58. He also gave me a few ideas when doing this project. Thanks again man.
And yes thats a 02 Porsche 911 TT in the background, its the owners
The stock crank pulley on the left, and a very very light D15 crank pulley from a 88 LX. Fits perfect.
This is what screwed me up, I had a idea that if you were to remove the step on the outside of the flywheel (make it flush) so the PP area and the Clutch area were the same it would make the stock clutch bite hard, and hold more power. Kinda like if you look at a B-series flywheel the steps are reverse to d-series. Well this didnt work out, it actually made the clutch slip really bad. It wouldnt hold any power and it was way to easy to engauge. So I pretty much did this backwards. I had the flywheel fixed today (stock step 30 thou)
Engine all ready to go in
All hooked up and installed. The B16a distributor and the nology wires are just temporary. So funny putting a D-series back in my car :-\
Yes I know, I dont have a upper radiator hose clamp, or the radiator doesnt have a mount either. Got a few things to fix
Still got the factory stickers on the upper timing cover
The exhaust system, lol.. a 2.5in cherry bomb (this is also temporary) and yes I know In need to cut those damn bolts for the cage.
I must say its nice to drive my car again, its been about 6 months since shes been on the road. Looks really funny without a intercooler in the front of my car :-[
My tinted lexan sunroof plug I made, it didnt come out as good as I wanted, oh well.
Since my car was sitting for 6 months the damn cage had surface rust all over it, so I spent the night cleaning it all up and painting it flat black for now.
All done, I missed a few spots here and there.. but I'll get it later!
This ALL MOTOR write up was brought to you by HMT biatch!
Ok so how does it run? ehh, not to bad. Pretty much what I expected. I didnt have crazy goals for the thing, I'm not trying to break records or anything like that either. It's definatly faster than a stock ZC. I'd say somwhere inbetween a stock LS and a stock b16a? I was hoping to get about a 40whp gain from all this **** I did. From my calculations the engine should be 14.1 c/r, whats crazy the thing has been pretty easy to tune so far. I havent had any issues with it pinging at all. We are all about to go to the dyno next saturday so we'll see if my *** dyno is accurate. I say 135ish....
Price list
D16a6 Free
ZC Pistons 140
z6 Head gasket 30
IM heat shield gasket 30
Delta Cam 50
Flywheel resurface 30
Valve Grind (buddy buddy deal) 150
Porting bits 30
I got around 500 bucks total into this project, however I have tons of labor in this project. Probably more hours in labor than I have ever done on one single project. Sadly it will be the lowest producing HP project that I spent the most time on.. Haha
::cliff notes::
40whp for 500 bucks is pretty decent if ya ask me.. a 500 dollar HMT kit would probably make double that.
Jeff
Modified by AbaZ at 12:32 AM 2/11/2005
ok first off people are going to be like? "WTF a NA D16a6? gimme a break" well, that is true, but I'm kinda building this engine for a specific reason, no its not a Honda-challenge engine or some type of racing engine. It was more of an experiment. Using all OEM parts and having to keep the engine looking like it was stock.
Starting off with a 88 D16a6 from a Civic SI (150k miles) I recently did a ZC swap in for a customer so I got it for free. The a6 puts out a blistering 105hp at the crank maybe 90ish whp.
Engine was pretty dirty since it was pretty high milage, I went ahead and dissasembled the engine.
Stock Intake manifold all carboned up
The head was pretty tired as well, full of carbon, exhaust valves were beat to hell.
Nice and black
Cleaned the block with Super clean and some mild degreaser and gave her a quick hone job.
I perfer Ball hones because they leave nicer cross hatch marks.
Standard bore Dohc ZC pistons from ebay. Comes with pins and rings.
Everything dissasembled and cleaned up.
Stock intake manifold being cut in half
Intake manifold chopped in half, you can see how small the runners are.
First thing was cutting the bridge's off on the plenum.
Then grinding them down smooth inside.
As you can see Porting makes a huge mess, so be prepared for a big clean up
Port matching the ports to about the same size as a B16a inlet.
Lower intake opened up big time, I spent several hours porting this damn intake manifold.
I hate porting.. just looking at these pics reminds me how much I hated it. Be sure to where ear plugs when doing this, because after 5 hours of grinding on metal it really gets annoying. All the guys in the shop wanted to kill me
Upper and lower intake all done. I ported the entire length of the runners.
The plenum all ported out (60mm inlet)
Upper and lower attached
Special porting bits I had, I made 1 of the tools, I welded a "whipit" on the end of some 1/4 rod so I could smooth out the insides of the runners after I ported them out. You can get these long carbid bits on tool trucks like snapon/mac/mactco etc. I also recommend using a Electric die grinder because they are easier to control and quieter.
Manifold welded up on the front side.
Can't even see the weld when all the **** attached
Next was the flywheel, I wanted to take a few pounds off this bitch.
Slapped the bitch on the brake lathe and went to town, took about a little over a hour. But I got 6.5lbs off the backside.
All done, I even did a slow cut on it
The Cylinder head... I wanted to shape the combustion chamber how B18c (gsr) cylinder heads are, this would require tig welding the areas shown above. This would also bump the compression up alot.
I welded up 1 chamber and started freaking out because it was really hard to control the bead. I was unaware that cylinder heads "sweat" when they are heated, so all the oil and **** comes flowing out of the metal. It made it really hard. So the master aluminum welder Lional did the rest for me. (thanks dude!)
As you can see I ported the **** out of the head, I had around 10 hours total in the head, I opened up everything.
Exhaust ports all polished up. The head also received a 3way valve grind and resurface.
Intake ports all ported out. Sorry I didnt take to many pics when I was doing the head because I forgot. I was in the "porting zone" lol.. the head came out real nice and I was really happy with it. The ports are all port matched and are about the same size of b16a ports, (maybe slightly larger) and by no means I'm not a professional head porter..
The block with the ZC pistons installed. ZC's have the largest dome on top of the piston compared to any other D-series piston. This really bumps the compression up on a D16a6 block.
Bottom end all cleaned up.. Did I replace the bearings? hell no, lol I couldnt beleive how good they looked I did replace 1 main bearing on the end because it was a little worn. I plastigauged the entire bottom end and it was perfect.
The Delta 272 Camshaft, its basically just a regrind. Delta is about a hour from my house so I picked one up. Pretty dang cheap, 49 bucks!
The Exhaust manifold, I compared the ZC/A6/Z6/Y8 manifolds and the ZC was by far the biggest.
ZC on the left, and the A6 on the right. The ZC uses a 4-2-1 design vs the 4-1 like the A6. Gave the mani a coat of high temp flat black.
Since I could not use a "header" I knew that alot of modifactions would have to be done to the stock manifold.
I found a B16a downpipe, and it appeared to have larger pipes, but the exit pipe was really small, just like the ZC. Both measured at 1.5in
I went to ******* town porting this manifold, I really hate porting cast iron more than anything. It stinks, it smells bad and I just overal hate it. Port matched for the most part, but the roof was raised.
Ported the Welds on the downpipe, and slightly enlarged them. Also port matched with the manifold.
Chopped off the shitty stock 1.5in flange and welded on a nice 2.5in pipe w/ 3bolt universal flange.
Using a D16z6 Head gasket and a Nayhow mfg Intake manifold gasket (basically the exact same materal as the Hondata IM gasket) It keeps intake temps down.
Engine being assembled
Using Prelude H22 345cc injectors on a modified Z6 fuel rail. (these will both be changed later to stock)
Big thanks to Chris M. for the Bored out D16a6 throttle body. Bore tapered from 60mm to 58. He also gave me a few ideas when doing this project. Thanks again man.
And yes thats a 02 Porsche 911 TT in the background, its the owners
The stock crank pulley on the left, and a very very light D15 crank pulley from a 88 LX. Fits perfect.
This is what screwed me up, I had a idea that if you were to remove the step on the outside of the flywheel (make it flush) so the PP area and the Clutch area were the same it would make the stock clutch bite hard, and hold more power. Kinda like if you look at a B-series flywheel the steps are reverse to d-series. Well this didnt work out, it actually made the clutch slip really bad. It wouldnt hold any power and it was way to easy to engauge. So I pretty much did this backwards. I had the flywheel fixed today (stock step 30 thou)
Engine all ready to go in
All hooked up and installed. The B16a distributor and the nology wires are just temporary. So funny putting a D-series back in my car :-\
Yes I know, I dont have a upper radiator hose clamp, or the radiator doesnt have a mount either. Got a few things to fix
Still got the factory stickers on the upper timing cover
The exhaust system, lol.. a 2.5in cherry bomb (this is also temporary) and yes I know In need to cut those damn bolts for the cage.
I must say its nice to drive my car again, its been about 6 months since shes been on the road. Looks really funny without a intercooler in the front of my car :-[
My tinted lexan sunroof plug I made, it didnt come out as good as I wanted, oh well.
Since my car was sitting for 6 months the damn cage had surface rust all over it, so I spent the night cleaning it all up and painting it flat black for now.
All done, I missed a few spots here and there.. but I'll get it later!
This ALL MOTOR write up was brought to you by HMT biatch!
Ok so how does it run? ehh, not to bad. Pretty much what I expected. I didnt have crazy goals for the thing, I'm not trying to break records or anything like that either. It's definatly faster than a stock ZC. I'd say somwhere inbetween a stock LS and a stock b16a? I was hoping to get about a 40whp gain from all this **** I did. From my calculations the engine should be 14.1 c/r, whats crazy the thing has been pretty easy to tune so far. I havent had any issues with it pinging at all. We are all about to go to the dyno next saturday so we'll see if my *** dyno is accurate. I say 135ish....
Price list
D16a6 Free
ZC Pistons 140
z6 Head gasket 30
IM heat shield gasket 30
Delta Cam 50
Flywheel resurface 30
Valve Grind (buddy buddy deal) 150
Porting bits 30
I got around 500 bucks total into this project, however I have tons of labor in this project. Probably more hours in labor than I have ever done on one single project. Sadly it will be the lowest producing HP project that I spent the most time on.. Haha
::cliff notes::
40whp for 500 bucks is pretty decent if ya ask me.. a 500 dollar HMT kit would probably make double that.
Jeff
Modified by AbaZ at 12:32 AM 2/11/2005
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Re: My A6 NA Project (xTravBx)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xTravBx »</TD></TR><TR><TD CLASS="quote">subscribed for dyno run</TD></TR></TABLE>
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From: Kicking ass in the desert, CA
Re: My A6 NA Project (BiTurboCiv)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BiTurboCiv »</TD></TR><TR><TD CLASS="quote">i want to know where the fuse box is at 
</TD></TR></TABLE>
search in the appearance forum for this mod. Its pretty easy to relocate it.
</TD></TR></TABLE>search in the appearance forum for this mod. Its pretty easy to relocate it.
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Joined: May 2003
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From: San Jose, Ca, USA
Re: My A6 NA Project (EF Two)
thats the **** right there. how does it feel driving? smooth power over the rpm range or does it only haul *** in the higher rpms. what did you do about detonation and high compression?
