Camshafts

So what else is there to do to an engine that was been big bored and has altered intake and exhaust systems? It's been reported that high performance camshafts may be the "icing on the cake".

So an investigation into how altering the cam profile could change things. First things first, let's collect some data on the stock camshafts and some of the available options.

Cam

Valve lift (in.) (EX/IN)

Duration (EX/IN)

Duration @ 0.050" (EX/IN)

EX C.L.

IN C.L.

LSA

Overlap

Overlap @ 0.050"

EX Open @ 0.050"

EX Close @ 0.050"

IN Open @ 0.050"

IN Close @ 0.050"

Stock

0.325/0.325

260/264

212/215

111.0

110.0

110.5

37 BBDC

5 BTDC

2.5 ATDC

37.5 ABDC

Webcam #101

0.350/0.350

250/250

229/229

106.5

104.5

105.5

41 BBDC

8 ATDC

10 BTDC

39 ABDC

Webcam #293

0.360/0.360

248/248

226/226

106.0

104.0

105.0

39 BBDC

7 ATDC

9 BTDC

37 ABDC

Here are the profiles:


Stock	Grind #101	Grind #293

Last Update: October 22, 2008

mooredan@suncup.net