the4ork

sorry im not a honda owner but i would like to compare camshaft specs...

vw 16v cams in stock form are very small, 220* or so for the euro cams...
what typically do you guys generally use for a FI cam, you can be very broad.

plese dont name names of companies like skunk 2 stage 1 cams, cause i wont have the slightest idea what that means

im looking for something with 12+mm of lift, i have alot of headwork done. but i know you boys over here make mad power with big cams and boost...

but i want to know how big the cams actually are, in stock form and aftermarket. i would really appreciate the help, thanks.
-Ricky

the4ork

wow posting a pic is whack on this forum... keeps changing my host or something. i guess w00t doesnt work on here? oh well. i was just posting a pic of my desktop with the standalone window running

the4ork

bump

alpha

From what Jeff Evans / Boosted Hybrid said. In general you increase the duration approximately 3 degrees for every 500rpm increase. The general trend is keep the duration down on turbo camshafts, but this limits the amount of overlap between the cams at high rpm. While this is good at lower rpm, as the rpm level increases you need the overlap between the cams to move more airflow through the combustion chambers. Like everything else there is trades offs, you'll never gain 20whp up top without losing power somewhere else in the powerband.

So from talking to Jeff Evans we came up with the following specifications; advertised duration. This is for a non-vtec 1999 B18b cylinder head.

Intake: 11.2-11.5mm lift 270-280 degree duration
Exhaust: 10.5mm lift 260-270 degree duration

The first set of cams were OEM cold welded and regrinded. Long story short the company didnt use a thick enough hardface weld resulting in the cams developing hairline cracks in the lobes. Crower is grinding the same spec cams from new billet cores. Will see.

the4ork

your saying 270-280 duration... is that at 1mm, 0mm or .50"?

ok a vw 16v euro ABF motor has an intake cam duration of:

212@1mm and 207@.50" lift is .378"

exhaust duration of:

220@1mm and 215@.50" lift is .402"

ok now going by what you just said.... those cams make peak power at about 5700rpm, weak sauce i know

i'd like to take the cams to 8500, so 8500-5700=2800rpm, now add 300 more to decrease the likelyness of my power falling off a cliff by redline... 3100rpm. now take 3100rpm divided by 500 thats 6.2 degrees....

now add that 6.2 degrees to the original cams... we'll round off to 7*
INtake: 219@1mm or 214@ .50"
EXaust:227@1mm or 222@ .50"

what kind of lift should i be looking at, 11's 12's?

the4ork

the4ork