Engine weight to HP ratio

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Old Jun 4, 2005 | 12:45 PM
  #1  
siMantis's Avatar
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From: ca
Default Engine weight to HP ratio

I heard that the SOHCzc weighed considerably less than the DOHC version making up for the power loss. Is this somewhat the same with d-series engines? "Keep in mind this is just what i heard". Does anyone have some numbers to compare?
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Old Jun 5, 2005 | 03:58 AM
  #2  
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Default Re: Engine weight to HP ratio (siMantis)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by siMantis &raquo;</TD></TR><TR><TD CLASS="quote">I heard that the SOHCzc weighed considerably less than the DOHC version making up for the power loss. Is this somewhat the same with d-series engines? "Keep in mind this is just what i heard". Does anyone have some numbers to compare?</TD></TR></TABLE>

People make alot more out of this than there really is. Especially in regard to D-series vs B-series motors. But the same is true if we are considering D-series vs D-series. I don't know the output of the SOHC ZC. But let's say it is 120HP, 100ft-lb torque. If your car weighs 2100 poundswith the SOHC ZC, then the 130HP, 105ft-lb DOHC ZC would have to weigh 175 pounds more than the SOHC ZC for the two to be equivalent in terms of power to weight ratio. And if we consider torque, the DOHC ZC would have to weigh 105 pounds more. And I can tell you for a fact that the DOHC ZC doesn't even weigh this much more. The bottom line: going with a more powerful engine generally more than offsets any associated weight increase by ALOT.
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Old Jun 5, 2005 | 04:47 AM
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Default Re: Engine weight to HP ratio (siMantis)

not to get off the subject of wieght to power but what about have the additional weight up front as far as for autocrossing etc.. I don't even know what the weight difference is up front but I would think that any additional weight would hurt some in cornering and braking esp. with having it up front.
thanks
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Old Jun 5, 2005 | 05:25 AM
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Default Re: Engine weight to HP ratio (sleeperx)

If you have carefully prepped and autox'd your car for a long time, you'd definitely notic the difference of 50 lbs up front. You'd have to drive a little differently to overcome some of the push. You could adjust the setup to compensate, but ultimately you'd pine for the lightest option, even if it compromised a little power.
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Old Jun 6, 2005 | 03:51 AM
  #5  
StorminMatt's Avatar
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Default Re: Engine weight to HP ratio (fireant)

Then again, a DOHC ZC is not going to weigh even 50 pounds more than a SOHC ZC. Also, it's not like I found that my handling took a crap even after B-series swaps.


Modified by StorminMatt at 1:51 PM 6/6/2005
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