my friend pulled his fist gen b16 last night and i had a look at it ..
for a while now weve been trying to figure out where his power is..
stock block with crower stage 2 cams cai/dcheader/2 1/4 all the way back

with the cams he should be pulling at least 8500 but when i drive it it feels like 8 grand is the most its got???? we checked the cat its ok ...it runs pretty rich lots of black smoke due to the spoon chip hes got ...(i think thats part of the problem)

anywho....looking in his exaust ports there is an assload of carbon..not hard but lots of it ...i took a flat head to see how hard it was and could belive how much was in there ..at least 1-3 mm think of crap....also his intake mani was caked with oil inside could all this be a big enough restriction to stop power and flow ???
btw this is in a crx

 

sounds like a lot of carbon build up alright. Try getting it dyno'd so you'll know exactly at what rpm you're making power, then tuning would be next.

 

motor is out already ....like i siad no power on top end ....drove an 99 si with ctr cams and it reved way better

 

hahahaa, my 1994 GSR was like that in the exhaust ports and header after 100k miles and never opened before I did it.

may be running too rich.
may need to be tuned.
may be using oil... combusting it?

 

Yes that could be the problem,think about this if there's that much buildup on the ports and manifold it's almost a sure thing that the back of the valves is covered with it to,maybe so much that it's blocking the airflow.When oil gets into the ports it sticks to the valves because it's the hotest part of the port and cakes there.Do a leakdown to see the motors condition,rings might be bad.

 

heres some pics i took 10 tonight

sorry the lighting was bad
note the colour of the exasut valves...are they ok ??
and i scraped a bit of the carbon off to get an idea of the depth











sorry for the size of the pics..........i didnt have time to resize

thanks for the iput

 

wow im really sorry about the size....

 

what u guys think on my cloged engine... think thats why i am losing power.

 

you should check the pcv valve and lean it out a bit , with a fpr, check out the map sensor make sure its working correctly, i have seen a few first gen b16a's with bad map sensors, also o2 sensors..if your blowing that much fuel your cat is probly facked by now anyway

 

well i replaced my pcv in the summer.. now with my DC header i had to make my two o2 sensor wires longer would that make a diff on how it runs... no codes
i ran alittle rich so i wouldnt run to lean on top end but botom ran rich....

 

it seems you are alot rich , maybe you should get it tuned on a dyno so you will get that a/f proper

 

he does run really rich..lots of black smoke on vtec engagment...we both have spoon prgram from the same guy and both run rich..ive been through 2 cats already...first mod im doing is losing the chip crap ....

but with the rich prob and carbon ...is it possible hes losing lots of power ...

i run a 15 in the quarter and he should be smoking me ..i take him by to car lenths..thats not right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">you should check the pcv valve and lean it out a bit , with a fpr, check out the map sensor make sure its working correctly, i have seen a few first gen b16a's with bad map sensors, also o2 sensors..if your blowing that much fuel your cat is probly facked by now anyway</TD></TR></TABLE>

my thoughts exactly. and even though you replaced the PCV, it may be too late as that buildup has spread quite thoroughly.

 

hmmm.. that suxs
should i get a programed chip for my car or use a VAFC.
i love to use hondata but its alot of money.
what u all think