KH vs. MC

[Todd Phenneger]

I believe the 140 rating is very conservative.  I have a KH in my 4kq.  Granted with polished heads and free exhaust.  But, I get (G-tech numboers) about 140hp at REAR wheels.  Hmmmm.   Thats at stock boost.  And, I'm as fast as a 4kq with an MC. 

  I'm not sure, the KH also has a different variation of k26 that has a smaller hot side that spools quicker as well.  I personally like it.  But the MC is a better block and does have a better cam and breathing.  Torque is closer between the two so I suspect the difference is in High RPM.  My KH doesn't pull as well as an MC at high RPM's.   Thats where the HP comes in but I think torque is about the same.

l8r  (for what its worth, home my opinion helps)

  TOdd


  

  Ameer Antar <ameer at snet.net> wrote: 
I still don't get why the MC is rated at such a high hp. The KH is 140hp, 
but the MC is 158-162hp. The KH bore size is only .06 smaller than the MC, 
which should only give you a max of 8-10hp gain. Also, the compression 
ratio is much lower. The KH is up at 8.3:1 while the MC is 7.8:1. This 
makes no sense, unless there is more boost or if there is a radical cam in 
there. But I thought the stock boost was .4 bar. I remember reading 
somewhere there are Audi's that let the boost go real high for a few 
seconds during WOT, but I thought that was for an S4 or something. What 
makes the engine more powerful under a lighter compression? If it's excess 
boost, doesn't the K26 turbo take a long while to spool up, making it less 
powerful at low rpms, when you consider the inefficient 7.8:1 comp ratio. 
Why didn't they just use a smaller dish piston and keep the old ratio? 
Usually as engines advance, they up the compression, not decrease...

-ameer antar

'84 5kT...190k miles

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Todd Phenneger
    83' ur-q (awaiting a 20vt)
    84' 4ktq  fun but I'm sick of CIS.


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