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 Post subject: Rules regarding DOHC ZC.
PostPosted: Tue Jan 27, 2015 7:06 pm 
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Hello everyone that reads this post.
I have a DOHC ZC engine with original ZC transmission in a 1990 Civic Hatch (yes, I know ZC trans is slower than Si trans).
I read 2014 rules and I only found very limited information regarding ZC.
There appears to be NO distinction between SOHC ZC & DOHC ZC.
But
then there regarding "10.3 H2 Limited Preparation Vehicle Engine Preparation section a"

" ...JDM SOHC ZC may not use pistons from a JDM DOHC ZC engine and a head from a D16Y8 because this involves putting parts together from 2 different engines."

Does this mean that Honda Challenge considers the DOHC ZC & SOHC ZC the same engine?
Otherwise section would have said "... from 3 different engines."
So, If I am reading it correctly, by default I am in H2 'Limited prep Vehicle '

Anyway I can remain in H4 with DOHC ZC as an "JDM si" ?

thanks in advance.


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PostPosted: Wed Jan 28, 2015 7:27 am 
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I can't answer your question but...ZC gearing is better than Si gearing. Use the Si 4.25 final drive with the ZC gearing and it's miles better.
(Or use an aftermarket 4.7 ;) )

Si__ vs __ZC
3.25____3.25
1.894___1.944
1.259___1.346
.937____1.033
.771____.878

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PostPosted: Wed Jan 28, 2015 10:01 am 
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In the list of H2 engines in the 2014 rules it has "cam(s)" with the list for mods. That seems to imply that it applies to engines with one or two cams. And since the DOHC ZC doesn't come stock with VTEC, it makes about the same power as a SOHC and most D16's. Plus, there are some D16's that have DOHC (D16A1 for example). My guess would be that it is included in the same category.

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PostPosted: Wed Jan 28, 2015 10:17 am 
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AZELISE wrote:
In the list of H2 engines in the 2014 rules it has "cam(s)" with the list for mods. That seems to imply that it applies to engines with one or two cams. And since the DOHC ZC doesn't come stock with VTEC, it makes about the same power as a SOHC and most D16's. Plus, there are some D16's that have DOHC (D16A1 for example). My guess would be that it is included in the same category.

I just remembered that someone did a write-up about swapping a DOHC head onto a SOHC block: http://www.thezcr.com/forums/showthread ... head+d16a6

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PostPosted: Fri Jan 30, 2015 3:05 pm 
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So, nobody know for sure.
Does anyone here run a DOHC ZC or SOHC ZC to give some feedback
I can see the SOHC ZC making the case for H4, but not the DOHC ZC ...

This makes me want to ditch this engine and get a SOHC ZC or D16A6...

Perhaps someone knows someone with a built D16A6 engine.
Thanks.

Thanks.


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PostPosted: Sat Jan 31, 2015 12:28 pm 
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Are you asking if you can remain in H4 with your engine?

Please post exactly what engine code you have and what specific chassis you have it in plus what class you want to run in. Then we might be able to help.

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PostPosted: Sun Feb 01, 2015 9:50 am 
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no motor swaps are allowed in H4

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PostPosted: Sun Feb 08, 2015 2:27 pm 
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Okay,
I guess i'll be classified in H2 ; might as well do some allowed parts swap.

Thanks for those who replied.


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PostPosted: Tue Feb 17, 2015 12:52 pm 
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ZC engine is definitely a H2 motor. Not permitted in H4.

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PostPosted: Wed Feb 18, 2015 4:20 pm 
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I ran both ZC engines in my CRX in H2. There is not nearly as much support for the DOHC as there is for the SOHC. I was able to get some good power out of it with a set of Gude cams in it. At the time I didn't have enough resources to develop the engine to the point I needed to so I gave up and went with the SOHC.

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