goal: building a all motor sohc turbo.

Questions:

What's the weight difference between a D16a6 and a Sohc ZC complete motor?

Which one would you turbo? Not interested in Dohc motors. Only these two. Advice welcome.

1988 CRX HF D16A6 TURBO
180 whp / 175 ft. trq @ 7 psi

Friend's setup.

 

They're identical. SOHC ZC = JDM D16A6. Only difference is the camshaft, which is more aggressive, giving the ZC a 10hp advantage. Swapping a ZC cam into an A6 head would theoretically yield a SOHC ZC minus the branding. I've heard claims that the head flows better, but I believe that to be hearsay as I have both heads. Obviously I haven't flowbenched both or anything, but they look identical.

 

thanks for the info. Now i can start my turbo setup.

 

also SOHC ZCs come with the 4-2-1 header vs. the 4-1 for our USDM D16A6.

 

indeed but my 4-2-1 does not bolt up to the stock cat on my 91 si

btw you can't have an all motor turbo man it's one or the other

 

Do the engines have the same compression?

 

yes they should have the same compresion because the blocks are identical i believe

 

[QUOTE=


1988 CRX HF D16A6 TURBO
180 whp / 175 ft. trq @ 7 psi

Friend's setup. [/QUOTE]

trooper0641

i live near thsi guy!

 

heres a comparison of ZC cams to A6. you should note that the carbed SOHC ZC cam is different than the MPFI ZC. also, the late model sohc ZC does have the compression ratio bumped up to 9.4 i believe.

i think its the combination of the 4-2-1 exhaust and higher intake cam of the JDM-D that provides the extra horsepower. my opinion is that the 4-1 exhaust manifold just sucks, and any aftermarket header is going to give you back that lost power on a US-D.

http://www.norcalcrx.org/tyson/SOHC_Cam.html