View Single Post
Old 05-15-2012, 02:48 PM   #1 (permalink)
Gasoline Fumes
Too many cars
 
Gasoline Fumes's Avatar
 
Join Date: Oct 2009
Location: New York State
Posts: 1,565

CRXFi - '88 Honda CRX XFi

Insight 256 - '00 Honda Insight
Team Honda
Gen-1 Insights

Insight 5342 (no IMA) - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 66.3 mpg (US)
Thanks: 1,310
Thanked 780 Times in 464 Posts
Disabling intake and exhaust valves (going to 8 valves in a 16-v head)

My original plan was to install a CRX HF camshaft along with the roller rocker arms in my 16-valve Civic Wagon. The HF torque peak is something like 2500 RPM lower than my engine. The HF has only 8 valves, but it's pretty clear that the head is very similar to the 16v head. There are blank spaces where the valves would be.




Unfortunately (and surprisingly) the HF cam has larger lobes that hit the 16v head, so I was unable to install the HF cam. So what I ended up doing was just using the spacers that are used on the HF in place of the missing rocker arms.




So far I like it. It's more responsive and torquey at the very low RPM I usually drive at. I kept overshooting my 2000 RPM shift point. But it will not make it to redline in second gear anymore. It's probably not an ideal setup, since the camshaft wants to make midrange power and the valves won't let it. I'm hoping for an increase in MPG, time will tell.

Not surprisingly, the exhaust is much quieter now.

__________________
2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro


Last edited by Gasoline Fumes; 05-16-2012 at 12:50 AM..
  Reply With Quote
The Following 6 Users Say Thank You to Gasoline Fumes For This Useful Post:
Christ (05-15-2012), kurzer (06-05-2012), renault_megane_dci (02-28-2013), robertwb70 (06-04-2012), t vago (05-15-2012), ultimx (06-05-2012)