TheSamba.com :: View topic

Wed Oct 31, 2018 3:49 pm

C35
0.381"
285º
246º@0.050"

163
0.383"
284º
249º@0.050"

Both on 108LC

I see a lot of recommendations for the 163 up to around the 2000cc mark for street engines and very rarely any mention of the C35. Any particular reason why?

Putting a 1915 together with 40x35 heads flowing 140cfm at what these two cams will do on 1.1 rockers (@25")

Already have the C35 but happy to try a 163 if it is that much better?

Going in a late beetle, 40IDFs

Wed Oct 31, 2018 5:47 pm

I don't expect that there would be any significant difference in how it runs, but when I compare a web to a scat profile I find the web is a lot nicer lobe design, and machining, which means it may require less valve spring to work and your valve train parts last longer.

Wed Oct 31, 2018 8:27 pm

I did a 2021cc with good 40x35 heads, 40mm carbs, 1 1/2" header, 9.0cr and a 163 cam.
I also did a 2054cc with similar heads, same size carbs and header, same compression and a c35.

The smaller engine with the 163 ran much better. The 2054/c35 always seemed a little lazy, and the 2021/163 always seemed ready to rip.

163 w/1.3 rockers for right at .500" lift would be great with good 40x35 heads.

Brian

Thu Nov 01, 2018 1:16 am

I think it was Pat Down's who mentioned in a thread on cams that even though the duration and lift are the same the cam timing and lift profile can be different and give different power levels .
I'm running a Scat C55 which is very close to a Web 86C advertised duration but by the .050" figures given the Web has more aggressive ramps and would also like to hear from anyone who's run both on the same configuration .

Thu Nov 01, 2018 1:33 am

What Modok and Brian said. Apart from whoever grinds Scat cam apparently is busy that day of the week the c35 is lazy on its own. Add 1,25 rockers and it suddenly works rather well.
T

Thu Nov 01, 2018 2:58 am

Thanks fellas. Exactly the info I was after. So by lifting the c35 to ~0.470" with 1.25:1 would be the most cost effective build.
I don't want to throw too much at this engine as the 2276 is ready to fit. But I want to have a spare long block on the shelf. Also I want to get the fuel injection set up on this motor too.

1.5" exhaust the way to go?
1.25:1 on just the inlets or both?

Thu Nov 01, 2018 9:23 am

Thinking about it. I want to keep rpms down due to the stock crank. Maybe Web 163 and stock rockers?