pics at the bottom of "new and improved" A6 top end.

Description of what happened is here:
https://honda-tech.com/zero...61063

I'll take pics of the metal plate that fell in.


Good thing I had a spare rebuilt D15B2 head in the garage.

I've got a single layer metal D-series head gasket sprayed with copper.

Has anyone used this to raise compression on a stock A6? Results?

I'm not sure what engine the gasket is from, it was lying in a buddys garage with 8 other head gaskets. Either a Z6 or Y8, but all holes line up perfect. In fact, the metal one even has bigger coolant flow holes over the water jackets.


Lesson Learned: Use a cam gear cover unless you have a valid reason (like adj. cam gears) It might look cool, but bent valves are NOT cool!


Modified by nuc79 at 11:07 AM 7/25/2004


Modified by nuc79 at 8:51 PM 8/2/2004

 

Its cool you have an extra D15 head. Put the SI cam though, it should work the same as the old head.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Deetz &raquo;</TD></TR><TR><TD CLASS="quote">Its cool you have an extra D15 head. Put the SI cam though, it should work the same as the old head. </TD></TR></TABLE>

Yeah, that's what i was planning. Other than the cams, they're identical in specs, right?

 

valve springs are most likely different...if they are the originals.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastcrxsi90 &raquo;</TD></TR><TR><TD CLASS="quote">valve springs are most likely different...if they are the originals.</TD></TR></TABLE>

Looked up valve springs for both a 1990 CRX DX and Si on slhondaparts.com.

Intake: 14761-PM3-013
Exhaust: 14761-PM3-014

Only difference I could find in the heads was the camshaft.
14111-PM6-A10 (Si) vs. 14111-PM5-A10 (DX)



Modified by nuc79 at 10:39 PM 7/25/2004

 

sorry bro....your wrong!

the <u>original </u> valvesprings that came in the dx head are different than the original valvesprings that came in the si head. the dx valvesprings are not made anymore and have been replaced with the si valvesprings.

that would be why the part numbers are the same...because the dx springs have been superseded by the si springs, so if you want dx springs you automatically get the better si ones.

that is why i said:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastcrxsi90 &raquo;</TD></TR><TR><TD CLASS="quote">valve springs are most likely different...if they are the originals.
</TD></TR></TABLE>

 

I always thought D-series were non interference and couldn't smash valves? When I bought my newest beater it had a snapped belt D15B2 and you could crank the starter and nothing catastrophic happened, are you sure you bent valves? Or are certain D-series interference?

 

Well, the DX head I'm using has a rebuild tag from Dover Cylinder Heads and a date of 2002, so I'm assuming the valves were replaced, so they must be the same part number.

BTW, do you happen to have the honda factory part # for the original DX springs? I didn't know they were ever different. I've searched all over this, and the crx forums...

There's a lot of myths that really haven't been proven...

 

I heard it's hit or miss whether you bend valves. My little brother had his 91 HB's B2 snap a belt, and all was fine...

Usually when the belt snaps, the camshaft stops moving, which helps to prevent damage.

In this case, the timing got waayy off as the metal plate jammed against the gear and went slack...with the engine still running.

Plus the A6s have higher compression than B2s -&gt; less valve to piston clearance...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nuc79 &raquo;</TD></TR><TR><TD CLASS="quote"> Well, the DX head I'm using has a rebuild tag from Dover Cylinder Heads and a date of 2002, so I'm assuming the valves were replaced, so they must be the same part number. </TD></TR></TABLE>

then more than likely you have the si valvesprings...but i dont know how you can tell for sure.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nuc79 &raquo;</TD></TR><TR><TD CLASS="quote">Plus the A6s have higher compression than B2s -&gt; less valve to piston clearance...</TD></TR></TABLE>

not to be a dick...but

the b2 will have less piston to valve clearance... the piston to deck clearance is 0.020" on both engines...but the b2 has a flat top piston while the a6 has a dished piston. the difference in compression ratio has more to do with the stroke difference, on these two paricular engines...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastcrxsi90 &raquo;</TD></TR><TR><TD CLASS="quote">
the b2 will have less piston to valve clearance... the piston to deck clearance is 0.020" on both engines...but the b2 has a flat top piston while the a6 has a dished piston. the difference in compression ratio has more to do with the stroke difference, on these two paricular engines... </TD></TR></TABLE>

agreed. BUT the D16A6 cam has higher lift. so the valves extend more into the combustion chamber. Besides, if you look at the pics below, that dish isn't much of a difference.
I had the heads off both a B2 and A6 block today. I brought pistons to tdc on both blocks, and measured. The distance from the deck, to the bottom of the valve indention "dents" in the pistons was the same for both...



Modified by nuc79 at 12:49 AM 8/2/2004

 

I lost one of the timing cover screws when putting my old B2 back together after changing the timing belt.
I started it up and it seemed to be running ok so I went on to check the ignition timing while I was in there.
I revved the motor a few times and started hearing a "tink-tink-tink".

I had no clue what it could have been.
Putting all the accessories back on the motor let me forget all about the missing screw.

So, I rev it up a few more times and I started hearing the sounds of distruction!
I removed the upper belt cover and found the belt shredded.
I tore it back down and the timing belt gear that slides onto the crank was thrashed! I still have it - should take pics! Some metal fell out of the lower cover when I removed it. It was the remains of the bolt! The threads were GONE - worn completely flat and polished! The head of the screw wasn't hex shaped anymore. It took on a round shape and was polished as well.
If you looked at the the crank gear from the side it looked fine. If you look at it from the front (from the front of the car) there was a nice round groove wunning through all the teeth!

Luckily (yeah... luckily... hahhahaa) the belt was still holding strong with about 1/32 of and inch left so the belt didn't snap.


I'll run covers FOREVER. I can imagine how it would suck to have a rock fly up from the road and hop into the lower cover. With my luck, that would happen.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">I'll run covers FOREVER. I can imagine how it would suck to have a rock fly up from the road and hop into the lower cover. With my luck, that would happen.</TD></TR></TABLE>
I second that.

Anyway, I got the new head on today, with the Y8 single layer gasket. It pulls harder than with the stock gasket. I forgot to take a pic of the gasket, but here's the head and block today:

These first two pics are of the head upside down and the cumbustion chambers filled all the way up with water. It sat like that for an hour, and no water leaked thru. So i'd say the valves are sealing, and my first head rebuild was productive.









Modified by nuc79 at 12:51 AM 8/2/2004

 

damn dude, how'd the wife like that **** on the kitchen table.....

yet another reason I'm 26 and single.... .....my kitchen table has the remains of my a/c control ghetto jdm paintup on it....my dining room table has 2 eg dash's on it......

and beefcake doesn't give a damn


Modified by nimblecivic at 2:17 AM 8/3/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nimblecivic &raquo;</TD></TR><TR><TD CLASS="quote">damn dude, how'd the wife like that **** on the kitchen table.....
</TD></TR></TABLE>

She loved it. especially when friends came over.

We just ate dinner in the family room for a few days, that's all...