I was wondering what it is in the d16z6 that makes it able to rev to 7200rpm? I belive it would have alot to do with just the head and valvetrain, and or crank, so can I use whatever part it is in a y8 or a6 block? or what would I need to make a y8 or a6 safe to rev to that or higher?

 

Its the stroke of the motor, the D16A6 has a longer stroke therfore it wont rev as high as a short stroked D16Z6/Y8.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHCKLR657 &raquo;</TD></TR><TR><TD CLASS="quote">Its the stroke of the motor, the D16A6 has a longer stroke therfore it wont rev as high as a short stroked D16Z6/Y8.</TD></TR></TABLE>

so can I use the Z6 Crank and rods in my A6? and why cant the y8 rev as high as the z6?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHCKLR657 &raquo;</TD></TR><TR><TD CLASS="quote">Its the stroke of the motor, the D16A6 has a longer stroke therfore it wont rev as high as a short stroked D16Z6/Y8.</TD></TR></TABLE>
Actually your wrong all 3 of those motors have the same bore and stroke....

were you get the extra rpms in the y8 AND Z6 are in the valve train and in the fact that they both have vtec where as the A6 doesnt.

 

Use D16a1 bits IF you want the best parts. Rev differences are due to the Electronics (ecu) little else :-)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bare &raquo;</TD></TR><TR><TD CLASS="quote">Use D16a1 bits IF you want the best parts. Rev differences are due to the Electronics (ecu) little else :-)</TD></TR></TABLE>

Correct. you can make a lawnmower run 10k rpms if you want... now whether it will blow up or not is a whole other subject.

Z6's and Y8's have vtec. meaning these engines make more power at higher rpm's. So honda made the ECU's on these motors have a higher rev limiter. Think about it if you have a motor that vtec kicks in at 6k rpms do you really want to have a 6200 rev limiter on it.

 

Well first an A6 DOESNT have a 6200 rev limiter and second wouldnt the head and valve train which contains the vtec play a little part in making the power up that high??

You cant say that oh the only reason they rev that high is because of the ECU well sure in a way thats true but then again they still make power that high as well.

The A6 can reach 7200 (I have done it with a chipped ecu) but there is absolutely no power up there so no reason for it.

Here, the reasons they have that high of a rev limit is because of vtec, the valve train AND the ecu does that make you feel better??

Aslo if you want to know what to do to make an A6 rev that high get aftermarket valves, springs, and cam and you will be able to rev the A6 that high as well OR you could simply throw a vtec head on it (Y8 or Z6) and either get your ecu chipped or do an obd-0 to obd-1 swap and plug in the p28 ecu and there you go....

 

all three motors will rev to 7500+ rpm safely.......

But not making power above 7000 so why bother?

 

so all a6, z6, and y8 bottom ends are exactly the same other than the pitsons? what makes the z6 vavltrain able to rev higher that the y8's, springs, rockers? could I use whatever makes the z6 rev higher in the y8 head? the reson I would do this is for the extra compression, and because I know a guy who is selling a y8 for cheap, then I dont have to hunt down a z6 one.

also; are all sohc vtec cams interchangable? I would belive so, but what one would you recomend for best to use with nitrous? does the cam have anything to do with the redline of the head from its stock motor?

 

the ecu is what allows the higher rev limit.......

 

so if the z6 and y8 heads are the same, and if the a6, z6, and y8 blocks are all the same, then why is the y8 redline a lower rpm?

 

i thought the bearings on the a6 were wider? if that has any thing to do with it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dohdoh420 &raquo;</TD></TR><TR><TD CLASS="quote">so if the z6 and y8 heads are the same, and if the a6, z6, and y8 blocks are all the same, then why is the y8 redline a lower rpm?</TD></TR></TABLE>

Since i have a Z6 in my car, i know the redline is 7200 rpm.

And If i am reading this correctly, the Z6 and Y8 have the same redline (7200), but both are capable of going past that mark, but don't because they are limited by the ecu and it would not matter anyway because they do not make power past 7200rpm.

And the only engine with a lower redline is the A6, not the Y8.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mach6 &raquo;</TD></TR><TR><TD CLASS="quote">

And the only engine with a lower redline is the A6, not the Y8.</TD></TR></TABLE>

yeah, ok I leared this last night also in my friends 98 civic, I thought the y8 was at like 6500 too, but I guess not, I witnessed it in person. thanks

 

"Redline" is not the same thing as "rev-limiter"...that might be confusing some people.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by davens &raquo;</TD></TR><TR><TD CLASS="quote">"Redline" is not the same thing as "rev-limiter"...that might be confusing some people.</TD></TR></TABLE>

Yea, I can't really comment on that in my car. I have a 1990 Civic Si guage cluster that has the redline starting at 6500, but my rev limiter is at 7200.

What about fuel cut-off?